Updated on 2024/03/29

写真a

 
SAKAMOTO Shuichi
 
Organization
Academic Assembly Institute of Science and Technology SEISAN DESIGN KOUGAKU KEIRETU Associate Professor
Graduate School of Science and Technology Advanced Materials Science and Technology Associate Professor
Faculty of Engineering Department of Engineering Associate Professor
Title
Associate Professor
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Degree

  • 学術博士 ( 1991.3   新潟大学 )

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Design engineering  / failure diagnosis

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Manufacturing and production engineering  / sensor

  • Informatics / Mechanics and mechatronics  / acoustical engineering

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Machine elements and tribology  / failure diagnosis

Research History (researchmap)

  • Niigata University   Faculty of Engineering Department of Engineering   Associate Professor

    2017.4

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  • Niigata University   Faculty of Engineering Department of Mechanical and Production Engineering   Associate Professor

    1998.4 - 2017.3

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  • Niigata University   Faculty of Engineering   Assistant

    1992.11 - 1998.3

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  • Niigata University   Graduate School of Science and Technology   Assistant

    1991.4 - 1992.10

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Research History

  • Niigata University   Faculty of Engineering Department of Engineering   Associate Professor

    2017.4

  • Niigata University   Graduate School of Science and Technology Advanced Materials Science and Technology   Associate Professor

    2007.4

  • Niigata University   Faculty of Engineering Department of Mechanical and Production Engineering   Associate Professor

    2007.4 - 2017.3

  • Niigata University   Associate Professor (as old post name)

    1998.4 - 2007.3

  • Niigata University   Faculty of Engineering   Research Assistant

    1992.11 - 1998.3

  • Niigata University   Graduate School of Science and Technology   Research Assistant

    1991.4 - 1992.10

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Professional Memberships

  • The Japan Society of Mechanical Engineers

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  • SOCIETY OF AUTOMOTIVE ENGINEERS OF JAPAN

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  • Institute of Noise Control Engineering / Japan

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  • JAPANESE SOCIETY FOR ENGINEERING EDUCATION

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  • アメリカ音響学会

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Committee Memberships

  • 新潟県   公害審査会 委員  

    2018.11   

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    Committee type:Municipal

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  • 新潟県   環境審議会 委員  

    2017.6   

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    Committee type:Municipal

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  • 新潟県   大規模小売店舗立地審議会 委員  

    2015.5   

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    Committee type:Municipal

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  • 日本機械学会   校閲委員  

    2009.4 - 2011.3   

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    Committee type:Academic society

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  • 日本機械学会 北陸信越支部   商議員  

    2009.3 - 2011.3   

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    Committee type:Academic society

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  • 日本機械学会   北陸信越支部 学生会幹事  

    2009.3 - 2010.3   

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    Committee type:Academic society

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Qualification acquired

  • Pollution Prevention Manager

 

Papers

  • Estimation of Sound Transmission Loss in Nanofiber Nonwoven Fabrics: Comparison of Conventional Models and the Simplified Limp Frame Model Reviewed

    Shuichi Sakamoto, Tsukasa Hasegawa, Koki Ikeda

    Nanomaterials   2023.11

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    DOI: 10.3390/nano13222947

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  • Theoretical and Experimental Analyses on the Sound Absorption Coefficient of Rice and Buckwheat Husks Based on Micro-CT Scan Data. Reviewed International journal

    Shuichi Sakamoto, Kentaro Toda, Shotaro Seino, Kohta Hoshiyama, Takamasa Satoh

    Materials (Basel, Switzerland)   16 ( 16 )   2023.8

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    In this study, the sound absorption coefficients of rice and buckwheat husks were estimated. Computed tomography (CT) images were processed to determine the circumference and surface area of voids in the granular material, and the normal incident sound absorption coefficients were derived. In addition, the tortuosity, which expresses the complexity of the sound wave propagation through the structure, was measured for each material. The theoretical sound absorption coefficients were then compared to the measured sound absorption coefficients with and without consideration of the tortuosity. A correction factor was used to bring the surface area of the granular material closer to the actual surface area and observed that the tortuosity obtained theoretical values that matched the trend of the measured values. These results indicate that using CT images to estimate the sound absorption coefficient is a viable approach.

    DOI: 10.3390/ma16165671

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  • Mathematical Model for Estimating the Sound Absorption Coefficient in Grid Network Structures. Reviewed International journal

    Takamasa Satoh, Shuichi Sakamoto, Takunari Isobe, Kenta Iizuka, Kastsuhiko Tasaki

    Materials (Basel, Switzerland)   16 ( 3 )   2023.1

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    Although grid network structures are often not necessarily intended to absorb sound, the gaps between the rods that make up the grid network are expected to have a sound absorption effect. In this study, the one-dimensional transfer matrix method was used to develop a simple mathematical model for accurately estimating the sound absorption coefficient of a grid network structure. The gaps in the grid network structure were approximated as the clearance between two parallel planes, and analysis units were derived to consider the exact geometry of the layers. The characteristic impedance and propagation constant were determined for the approximated gaps and treated as a one-dimensional transfer matrix. The transfer matrix obtained for each layer was used to calculate the sound absorption coefficient. The samples were fabricated from light-curing resin by using a Form2 3D printer from Formlabs. The measurement results showed that a sound absorption coefficient of 0.81 was obtained at the peak when seven layers were stacked. A sensitivity analysis was carried out to investigate the influence of the rod diameter and pitch. The simulated values tended to be close to the experimental values. The above results indicate that the mathematical model used to calculate the sound absorption coefficient is sufficiently accurate to predict the sound absorption coefficient for practical application.

    DOI: 10.3390/ma16031124

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  • Estimation of the Acoustic Properties of the Random Packing Structures of Granular Materials: Estimation of the Sound Absorption Coefficient Based on Micro-CT Scan Data. Reviewed International journal

    Shuichi Sakamoto, Kyosuke Suzuki, Kentaro Toda, Shotaro Seino

    Materials (Basel, Switzerland)   16 ( 1 )   2022.12

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    In this study, the sound absorption properties of randomly packed granular materials were estimated. Generally, it is difficult to construct a general mathematical model for the arrangement of randomly packed granular materials. Therefore, in this study, an attempt was made to estimate the sound absorption coefficient using a theoretical analysis by introducing data from computed tomography (CT) scans, as the tomographic images of CT scans correspond to the slicing and elemental division of packing structures. In the theoretical analysis, the propagation constants and characteristic impedances in the voids were obtained by approximating each tomographic image as a void between two parallel planes. The derived propagation constants and characteristic impedances were then treated as a one-dimensional transfer matrix in the propagation of sound waves, and the transfer matrix method was used to calculate the normal incident sound absorption coefficient. The theoretical value of the sound absorption coefficient was derived using the effective density to which the measured tortuosity was applied. As a result, for the theoretical values considering the tortuosity, in many cases, the theoretical values were close to the measured values. For the theoretical values, when both the surface area and tortuosity were considered, the peak sound absorption frequency moved to a lower frequency and was in general agreement with the measured values.

    DOI: 10.3390/ma16010337

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  • Mathematical Models and Experiments on the Acoustic Properties of Granular Packing Structures (Measurement of Tortuosity in Hexagonal Close-Packed and Face-Centered Cubic Lattices). Reviewed International journal

    Shuichi Sakamoto, Kyosuke Suzuki, Kentaro Toda, Shotaro Seino

    Materials (Basel, Switzerland)   15 ( 20 )   2022.10

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    In this study, the sound absorption characteristics of hexagonal close-packed and face-centered cubic lattices were estimated by theoretical analysis. Propagation constants and characteristic impedances were obtained by dividing each structure into elements perpendicular to the incident direction of sound waves and by approximating each element to a clearance between two parallel planes. Consequently, the propagation constant and the characteristic impedance were treated as a one-dimensional transfer matrix in the propagation of sound waves, and the normal incident sound absorption coefficient was calculated by the transfer matrix method. The theoretical value of the sound absorption coefficient was derived by using the effective density applied to the measured tortuosity. As a result, the theoretical value was becoming closer to the measured value. Therefore, the measured tortuosity is reasonable.

    DOI: 10.3390/ma15207393

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  • Simplified Limp Frame Model for Application to Nanofiber Nonwovens (Selection of Dominant Biot Parameters). Reviewed International journal

    Shuichi Sakamoto, Tetsushi Shintani, Tsukasa Hasegawa

    Nanomaterials (Basel, Switzerland)   12 ( 17 )   2022.9

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    This study aimed to discover an easy and precise prediction model for the acoustic properties of nanofiber nonwoven fabrics. For this purpose, a prediction model focusing on the two dominant parameters in the Limp frame model-bulk density and flow resistivity-was suggested. The propagation constant and characteristic impedance was generated from the effective density and effective volume modulus generated by the predictive model and treated as a one-dimensional transfer matrix. The sound absorption coefficient was then estimated using the transfer matrix approach. The trend of the normal Incident sound absorption coefficient measured and the sound absorption coefficient obtained from the predictive model were consistent. Thus, it is suggested that the predictive model for the proposed nanofiber nonwoven composite sheet is valid.

    DOI: 10.3390/nano12173050

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  • Addition of Two Substantial Side-Branch Silencers to the Interference Silencer by Incorporating a Zero-Mass Metamaterial. Reviewed International journal

    Shuichi Sakamoto, Juung Shin, Shota Abe, Kentaro Toda

    Materials (Basel, Switzerland)   15 ( 15 )   2022.7

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    Zero-mass metamaterials comprise an orifice and a thin film. The resonance between the film and the air mass of the orifice hole is caused by sound waves, which significantly decreases the transmission loss at a specific frequency. The study novelly incorporates acoustic metamaterials in the delay tube of an interference silencer. In this case, it is determined that an interference silencer and a "side-branch silencer with two different branch pipe lengths" can be realized in a single silencer. At certain frequencies, the acoustic mass of the acoustic metamaterial approaches zero, which results in an interference silencer with the full length of the delay tube applied. At other frequencies, the acoustic metamaterial acts as a rigid wall with high transmission loss, thereby reflecting sound waves at the zero-mass metamaterial location. In this case, it is a side-branch silencer with two different tube lengths, corresponding to the tube lengths from the entrance and exit of the delay tube to the zero-mass metamaterial, respectively. The incorporation of zero-mass metamaterial into an interference-type silencer can introduce the silencing effect of a side-branch silencer with two different branch tube lengths without increasing the volume of the interference-type silencer. Theoretical values were obtained using the transfer matrix. Consequently, the theoretical and experimental values were close, enabling us to predict the transmission loss of the proposed silencer.

    DOI: 10.3390/ma15155140

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  • Effect of Sheet Vibration on the Theoretical Analysis and Experimentation of Nonwoven Fabric Sheet with Back Air Space. Reviewed International journal

    Shuichi Sakamoto, Ryo Iizuka, Takumi Nozawa

    Materials (Basel, Switzerland)   15 ( 11 )   2022.5

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    The purpose of this study was to improve the accuracy of the theoretical analysis of sound absorption mechanisms when a back air space is used in nonwoven fabrics. In the case of a nonwoven sheet with a back air space, it can be shown that there is a difference between the experimental results and theoretical analysis results obtained using the Miki model when the area of the nonwoven sheet is large. Therefore, in this study, the accuracy of the theoretical values was improved using the plate vibration model in conjunction with the Miki model. The experimental results showed that when the vibration of the nonwoven sheet was suppressed, the sound absorption coefficient was higher than that of the vibration-prone nonwoven sheet alone. The sound absorption coefficient at the peak frequency was increased by >0.2, especially for 3501BD. Using the support frame, the sound absorption coefficient at the peak frequencies of 3A01A and 3701B was increased to 0.99. In the theoretical analysis of a large-area, vibration-prone nonwoven fabric, in which the vibration of the nonwoven fabric was taken into account, the theoretical values were in agreement with the experimental values, and the accuracy of the theoretical values was improved. Comparing the theoretical values for nonwoven fabrics without high ventilation resistance, the sound absorption coefficient was greater when vibration was not considered. Therefore, it was suggested that the vibration of the nonwoven fabric hinders sound absorption.

    DOI: 10.3390/ma15113840

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  • Experimental study on open-end correction of a Helmholtz resonator narrow slit neck Reviewed

    Shuichi Sakamoto, Yuki Akiba, Ryo Iizuka, Shunsuke Watanabe, Ryota Kominami, Tetsushi Shintani

    Noise Control Engineering Journal   70 ( 2 )   128 - 135   2022.3

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    In general, the acoustic effective length of the open end of an air column is longer than its geometric length. Here, the effective increment of the geometric length of an air column is called the open-end correction length, which is an acoustically crucial issue. The purpose of this study is to experimentally clarify the open-end correction length for a slit shape with a narrow clearance. For this reason, the sound absorption coefficient was measured using a sample in which the neck of the Helmholtz resonator was shaped as a slit with a narrow clearance. Next, the open-end correction length (i.e., mass end correction length and resistive end correction length) was calculated backward by comparing the experimental and theoretical sound absorption curves. The resistive end correction increased as the slit width became narrower within the range of 0.5 mm or less for both the center slit and the slit near the wall, indicating a significant discrepancy between the theoretical equation and the estimated value. For the mass end correction, in the case the center slit, the estimated value is close to the theoretical value of in the slit width range from 0.3 mm to 1.0 mm. The results of this study may be useful in eliminating discrepancies in correction values for open-end correction in slits with narrow clearance.

    DOI: 10.3397/1/377011

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  • Comparison of estimated and measured sound-absorption coefficient and transmission loss by geometric dimensions of a collection of equilateral triangular holes Reviewed

    Shuichi Sakamoto, Kouta Sutou, Arata Nakano, Hirohiko Tanikawa, Takanari Azami, Tetsushi Shintani

    Noise Control Engineering Journal   70 ( 2 )   150 - 160   2022.3

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    We performed a theoretical analysis on collection of equilateral triangular holes with consideration for sound wave attenuation within the tube and then calculated the sound-absorption coefficient and transmission loss. We then compared these results with experimental values. In the experiment, we measured the sound-absorption coefficient and transmission loss of a test sample using impedance measurement tubes with two and four microphones. We estimated the sound-absorption coefficient and transmission loss because of the dimensions of a collection of equilateral triangular holes through theoretical analysis and then compared these results with experimental values. In the present analysis, the propagation constant and characteristic impedance were introduced into a one-dimensional transfer matrix. Considering the effects of sound wave attenuation in the tubule from three-dimensional analysis, we derived the propagation constant and characteristic impedance. Values for the sound-absorption coefficient and transmission loss obtained through the analysis of holes as triangles rather than as circles gave calculation results closer to the experimental values. This is because this method more suitably simulates the effects of the boundary layer that occupies the space within the hole. The results show that the sound absorption coefficient and transmission loss of triangular honeycombs can be estimated with sufficient accuracy using only geometric dimensions and physical properties.

    DOI: 10.3397/1/377013

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  • Sound-absorption coefficient of a pin-holder structure for sound waves incident in the direction perpendicular to the cylinder's axis Reviewed

    Takamasa Satoh, Shuichi Sakamoto, Shunsuke Unai, Takunari Isobe, Kenta Iizuka, Katsuhiko Tasaki, Isami Nitta, Tetsushi Shintani

    Noise Control Engineering Journal   70 ( 2 )   136 - 149   2022.3

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    In this study, the sound-absorption coefficients of a pin-holder structure consisting of a group of cylinders were estimated and compared with the experimental values for the case where sound waves are incident in the direction perpendicular to the cylinder's axis. To estimate the sound-absorption coefficient, the gap in the pin-holder structure is divided into elements and approximated as being between two parallel planes, taking the exact shape of the divided elements into account. The characteristic impedance and propagation constant of the approximated clearances were calculated and treated as a one-dimensional transfer matrix. The transfer matrices for each element were used to calculate the sound-absorption coefficient. The calculated theoretical values were compared with the experimental ones. In the experiment, the samples were fabricated using a 3D printer, and the sound-absorption coefficient was measured using a two-microphone impedance-measurement tube. Although the experimental and theoretical values differed, they showed similar trends. We also found that the prediction error in the practical sound-absorption coefficient could be reduced by adjusting the diameter of the pins used in the calculation.

    DOI: 10.3397/1/377012

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  • Measurement and theoretical analysis of sound absorption of simple cubic and hexagonal lattice granules Reviewed

    Shuichi Sakamoto, Kohei Ii, Ibuki Katayama, Kyosuke Suzuki

    Noise Control Engineering Journal   69 ( 5 )   401 - 410   2021.9

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    A structure that possesses a continuous pore space packed with a granular material exhibits acoustic characteristics based on the principle similar to that of a porous material. Such a structure is used in low-noise pavement and ballast track. Therefore, predicting the sound absorption characteristics of a clearance generated in a granular material from the particle diameter and the physical property of gas is useful for engineering. This article deals with two packing models, namely, the simple cubic lattice model and the hexagonal lattice model, to measure the sound absorption coefficient of the structure packed with a granular material whose particle diameter is a few mm. Furthermore, a simple and accurate theoretical analysis that uses a one-dimensional transfer matrix method, which does not require numerous parameters, was performed. Comparing experimental values, when the particle diameter of the granular material was 4 mm, the percentage of the boundary layer in the clearance was moderately larger than when the diameter was 8 mm; therefore, the effect of viscosity on it was larger, and its sound absorption coefficient peak was higher. Moreover, compared with the simple cubic lattice, the hexagonal lattice had a higher percentage of boundary layer in the clearance because of its smaller volume of pore space. Then, the influence of friction due to the viscosity on it was higher, and its sound absorption coefficient peak was higher. In addition, the theoretical values obtained by the proposed analysis method typically matched the experiment values.

    DOI: 10.3397/1/376937

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  • Study and estimation of sound absorption coefficient of pin holder structure Reviewed

    Takamasa Satoh, Shuichi Sakamoto, Kohta Akamine, Shunsuke Unai, Takunari Isobe, Kenta Iizuka

    Noise Control Engineering Journal   69 ( 2 )   102 - 111   2021.3

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    In this study, a theoretical analysis of the acoustic characteristics of a pin holder structure was conducted. In addition, the sound absorption coefficient, entering its clearance through the geometrical dimension of the clearance or the physical property of air, was calculated. The analysis model approximates the aperture of a pin holder structure as the clearance between two parallel surfaces. Thus, the propagation constant and characteristic impedance were obtained and treated as a one-dimensional transfer matrix. Subsequently, the sound absorption coefficient was calculated using the transfer matrix method and was compared with the experimental results. In the experiment, a two-microphone impedance tube was used to measure the sound absorption coefficient of the test samples. We attempted to perform a simple yet accurate estimation using these procedures. The theoretical analysis values exhibited a similar tendency to that of the experimental values.

    DOI: 10.3397/1/376911

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  • Small plate vibration sound-absorbing device with a clearance and without surrounding restriction: Theoretical analysis and experiment Reviewed

    Shuichi Sakamoto, Kouhei Fujisawa, Shunsuke Watanabe, Taku Watanabe, Ryota Kominami, Yuki Akiba

    Noise Control Engineering Journal   69 ( 1 )   30 - 38   2021

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    This article focuses on the theoretical analysis and experiment of a small plate vibration sound-absorbing device with a clearance and without surrounding restriction. Generally, a plate vibration sound-absorbing device absorbs sound in a frequency range lower than that of porous material, which is used as a sound-absorbing material, and its sound absorption coefficient is small. Furthermore, note that the plate is fixed at the periphery in a conventional plate vibration sound-absorbing device. Hence, when the plate is small, vibration barely occurs and effective sound-absorbing effect is not obtained. Given that the plate vibration sound-absorbing device has a restriction wherein a particular size of plate is required, it is primarily utilized for indoor finishing considering the architectural acoustics, and finding applications for small-sized machines has been challenging. Theoretical values in this work are calculated assuming that the clearance and back air layer for the small plate vibration sound-absorbing device constitute a Helmholtz resonator. Furthermore, experiments were conducted to perform comparisons against the theoretical value. The theoretical analysis was conducted by connecting the clearance and back air layer in parallel with the plate portion in the electrical equivalent circuit. By performing the experiments using various parameters, the sound absorption characteristics of the proposed plate vibration sound-absorbing device were determined. If the clearance is smaller than the boundary layer thickness, then the conventional resistive end correction cannot be applied.

    DOI: 10.3397/1/37693

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  • Theoretical and experiment analysis on the sound absorption characteristics of a layer of fine lightweight powder. Reviewed International journal

    Shuichi Sakamoto, Kohei Yamaguchi, Kohei Ii, Rikuya Takakura, Yuya Nakamura, Ryusuke Suzuki

    The Journal of the Acoustical Society of America   146 ( 4 )   2253 - 2253   2019.10

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    In this study, the sound absorption characteristics of lightweight powders with a particle size on the order of tens of micrometers have been investigated. Herein, to theoretically determine the sound absorption coefficient of a fine lightweight powder in the longitudinal vibration mode, it was assumed that the powder was continuum and could be treated as a multiple degree-of-freedom damping vibration system. In addition, the acoustic impedance was calculated by assuming proportional viscous damping to determine the sound absorption coefficient. Finally, the theoretical and experimental values were compared. With the presented theoretical analysis, values close to the experimental results were obtained. Among the three calculated values based on proportional viscous damping, i.e., Rayleigh damping, rigidity proportional damping, and mass proportional damping, the results for Rayleigh damping were the closest to the experimental values.

    DOI: 10.1121/1.5126951

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  • Experiment and estimation of the sound absorption coefficient for clearance of corrugated honeycomb. Reviewed International journal

    Shuichi Sakamoto, Yuki Maruyama, Kohei Yamaguchi, Kohei Ii

    The Journal of the Acoustical Society of America   145 ( 2 )   724 - 724   2019.2

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    The sound absorption coefficient of thin tubes with a honeycomb-corrugated structure was estimated via theoretical analysis assuming the dimensions of the tube and the known physical properties of air. This analysis yields a propagation constant and characteristic impedance, which can be modeled as a one-dimensional transfer matrix. The sound absorption coefficient is then calculated by the transfer-matrix method and the results of comparison with the experiments are reported. The corrugated clearance was divided into elements for which approximations that assumed the clearance between two planes and took into account the perimeter and cross-sectional area of each element were considered. The theoretical value of the sound absorption coefficient obtained using this method was shown to be in good agreement with the experimental results. The experimental value of the sound absorption coefficient was larger than the theoretical value in the previous method in the analysis wherein each divided element was approximated by the distance between two planes taking into account the thickness and cross-sectional area of the clearance.

    DOI: 10.1121/1.5089427

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  • Physical-random number generation via a diode laser's frequency noise: an investigation into frequency discriminator Reviewed

    Arai Hideaki, Sato Takashi, Doi Kohei, Ohdaira Yasuo, Sakamoto Shuichi, Ohkawa Masashi

    JAPANESE JOURNAL OF APPLIED PHYSICS   58 ( 1 )   2019.1

  • A silencer incorporated within the thickness of the edge of the door for increasing sound transmission loss. Reviewed International journal

    Shuichi Sakamoto, Shota Koseki, Mizuki Chinda, Shota Abe

    The Journal of the Acoustical Society of America   144 ( 6 )   3303 - 3303   2018.12

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    The present study focuses on a silencer built within the thick portion of a door edge and reports on the results of evaluating silencers by determining sound transmission loss via theoretical analysis and experiments on three types of silencers. The theoretical analysis involved determining the calculated values of sound transmission loss obtained using the transfer matrix method. The change in cross-sectional shape was analyzed by elemental division of the transfer matrix. Using the above, simulations were performed with respect to the optimum shape of the silencer. These theoretical analyses were then compared with the measurement results. Furthermore, the study includes the results of an experiment that attempted to restrain the dip in sound transmission loss by adding a non-woven fabric to the opening of the silencer. In a side branch silencer with an increasing shape wherein the longitudinal cross-section is a linear or an exponential function, the peak of the transmission loss was shifted to the lower frequency side when compared with that in the case of a rectangular side branch silencer. Furthermore, in comparisons between the two, the sound attenuation peak frequency was lower in the case of the exponential shape. The resonance of the side branch was suppressed by adding a non-woven fabric to the opening of the side branch silencer. As a result, the peak and dip of sound attenuation were alleviated, and the sound attenuation characteristics could be adjusted.

    DOI: 10.1121/1.5082301

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  • Estimation and experiment for sound absorption coefficient of three clearance types using a bundle of nested tubes. Reviewed International journal

    Shuichi Sakamoto, Hirohiko Tanikawa, Yuki Maruyama, Kohei Yamaguchi, Kohei Ii

    The Journal of the Acoustical Society of America   144 ( 4 )   2281 - 2281   2018.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Acoustical Society of America  

    Closely packed nested structure circular tubes form three types of clearances: circular clearances, concentric clearances, and longitudinal clearances. The cross-sectional shape of rice straw, including three types of clearances?circular clearances, concentric clearances, and clearances formed by three closely packed cylinders?is similar to that of the samples of the present study. Herein, the propagation constant and characteristic impedance of the circular, concentric, and longitudinal clearances surrounded by three cylindrical surfaces are treated as a transfer matrix. Then, by connecting these transfer matrices in parallel, a transfer matrix integrating these clearances is determined, and the sound absorption coefficient is calculated. Test samples that have three types of clearances are also created, and measure their sound absorption coefficients. The contributions of the concentric and circular clearances are significant because of the dimensions of the used tubes. The results of the calculations that took eccentricity into account revealed no significant impact on the sound absorption coefficient in wide-frequency range. The results of the calculations that took flexure int

    DOI: 10.1121/1.5063348

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    Other Link: https://asa.scitation.org/doi/abs/10.1121/1.5063348

  • Hearing Loss Controlled by Optogenetic Stimulation of Nonexcitable Nonglial Cells in the Cochlea of the Inner Ear. Reviewed International journal

    Mitsuo P Sato, Taiga Higuchi, Fumiaki Nin, Genki Ogata, Seishiro Sawamura, Takamasa Yoshida, Takeru Ota, Karin Hori, Shizuo Komune, Satoru Uetsuka, Samuel Choi, Masatsugu Masuda, Takahisa Watabe, Sho Kanzaki, Kaoru Ogawa, Hidenori Inohara, Shuichi Sakamoto, Hirohide Takebayashi, Katsumi Doi, Kenji F Tanaka, Hiroshi Hibino

    Frontiers in molecular neuroscience   10   300 - 300   2017.9

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:FRONTIERS MEDIA SA  

    Light-gated ion channels and transporters have been applied to a broad array of excitable cells including neurons, cardiac myocytes, skeletal muscle cells and pancreatic b -cells in an organism to clarify their physiological and pathological roles. Nonetheless, among nonexcitable cells, only glial cells have been studied in vivo by this approach. Here, by optogenetic stimulation of a different nonexcitable cell type in the cochlea of the inner ear, we induce and control hearing loss. To our knowledge, deafness animal models using optogenetics have not yet been established. Analysis of transgenic mice expressing channelrhodopsin-2 (ChR2) induced by an oligodendrocyte-specific promoter identified this channel in nonglial cells-melanocytes-of an epithelial-like tissue in the cochlea. The membrane potential of these cells underlies a highly positive potential in a K C -rich extracellular solution, endolymph; this electrical property is essential for hearing. Illumination of the cochlea to activate ChR2 and depolarize the melanocytes significantly impaired hearing within a few minutes, accompanied by a reduction in the endolymphatic potential. After cessation of the illumination, the hearing thresholds and potential returned to baseline during several minutes. These responses were replicable multiple times. ChR2 was also expressed in cochlear glial cells surrounding the neuronal components, but slight neural activation caused by the optical stimulation was unlikely to be involved in the hearing impairment. The acuteonset, reversible and repeatable phenotype, which is inaccessible to conventional gene-targeting and pharmacological approaches, seems to at least partially resemble the symptom in a population of patients with sensorineural hearing loss. Taken together, this mouse line may not only broaden applications of optogenetics but also contribute to the progress of translational research on deafness.

    DOI: 10.3389/fnmol.2017.00300

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  • Study of arrayed side branch silencer for ventilation door (Improvement of attenuation characteristic using of the linear expanded shape side branch tube) Reviewed

    坂本秀一, 石田宗弘, 珍田美月

    日本機械学会論文集(Web)   83 ( 850 )   1 - 12   2017.6

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    <p>In this article, we examined several longitudinal-sectional sizes of a silencer whose volume was limited by the thickness and aperture ratio of the ventilation door. We report the results of improvement in the sound attenuation properties of these shapes. As an evaluation method for the silencer, we measured transmission losses using an impedance measurement tube and calculated them on the basis of a theoretical analysis. The following results were obtained from the evaluation of the silencer using the measurement and calculation results and from the verification of the improved shape of a silencer and silencer array. For a side branch tube silencer with a 1/3 aperture ratio, assuming that it is installed into the ventilation door, we observed a side branch tube with an linear expanded longitudinal-sectional shape by improving the shape using the theoretical analysis of transmission losses. In addition, as a result of the experiment with a sample on the basis of the theoretical analysis, both the experimental and the theoretical analysis were in good agreement. Furthermore, the expanded shape of the longitudinal-section of the side branch tube decreased the frequency of the sound attenuation peak. It was found that a silencer with a combination of four of these silencers can be arrayed side-by-side in a ventilation door; this results in a flat transmission loss of more than 5 dB over a broad band.</p>

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  • Study on the resolution improvement of a range finder using the chaotic frequency characteristics of a laser diode Reviewed

    Takahiro Saito, Shinya Maehara, Kohei Doi, Takashi Sato, Yasuo Ohdaira, Shuichi Sakamoto, Masashi Ohkawa

    OPTICAL ENGINEERING   56 ( 6 )   1 - 6   2017.6

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    An optical range finder system that relies on laser diodes' frequency noise, instead of intensity or frequency modulations, and its improvement in resolution are reported. The distance to the target is measured by calculating the cross-correlation of two signals reflected from the target and reference mirrors. These two signals are converted from the laser diodes' frequency noise signals by frequency/intensity converters, such as a Fabry-Perot etalon. We obtained the distance to the target by checking time lags between the target and reference beams at the highest correlation coefficient. We also measured the change in the correlation coefficient around the peak sampling point by adjusting the reference-path length, achieving a resolving power of +/- 3 mm. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License.

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  • Study for sound-absorbing materials of biomass tubule (Oblique incident sound-absorption coefficient of oblique arrangement of rice straws) Reviewed

    Shuichi SAKAMOTO, Taisei TSURUMAKI, Kohei FUJISAWA, Koki YAMAMIYA

    Transactions of the JSME (in Japanese)   83 ( 845 )   1 - 14   2017.1

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    In this paper, we report the use of sound-absorbing materials, specifically sound-absorbing structures of bundled rice straws, that are oblique arranged incident to the sound waves. In addition, we investigated the normal and oblique incident sound-absorption coefficients of sound-absorbing structures made of bundled rice straws in free space. In this study, we placed sound-absorbing structures made of bundled rice straws at an angle against the direction of the thickness in order to elongate the rice-straw element without increasing the apparent thickness. We then experimentally investigated the increase in sound absorption in the low-frequency range. The following conclusions were drawn. For test samples in which rice straws were arranged both in a normal direction and in an oblique manner, the value of the normal incident sound-absorption coefficient in free space was close to the results obtained using acoustic tubes. For test samples with rice straws arranged both in the normal direction and in the oblique manner, the sound-absorption peak of the oblique incident sound-absorption coefficient in free space was shifted to the high-frequency side compared with that of the normal

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  • W-04 Student's International Activities in Two Decades in Faculty of Engineering, Niigata University Reviewed

    SATO Takashi, SAKAMOTO Shuichi, SHIMIZU Tadaaki, SUZUKI Takamasa, SASAKI Tomohiro, OKA Tetsuo

    JSEE Annual Conference International Session Proceedings   2017 ( 0 )   31 - 34   2017

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    In 1996, when the Faculty of Engineering of Niigata University, Niigata Japan first set up its international student exchange program with Otto-von-Guericke-University, in Magdeburg, Germany, few students showed an interest in studying abroad. Twenty years later, the students' attitudes have changed. The number of students who express a desire to study abroad and have experienced the international conference has increased markedly. In this article, two directions of opportunities for students to start studying abroad are presented; one is short-term summer school program as a subject of general education to remove the students' barriers to go abroad, and the other is research-oriented students' exchange program.

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  • Beat Signal Generation between Two Rubidium Absorption-Line-Stabilized Diode Lasers in GHz-Frequency Band Reviewed

    Tomoyuki Uehara, Shinya Maehara, Kohei Doi, Toshiya Nimonji, Takahiro Saito, Hideaki Arai, Takashi Sato, Yasuo Ohdaira, Shuichi Sakamoto, Masashi Ohkawa

    International Journal of Modern Physics and Applications   2 ( 1 )   1 - 6   2016.3

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    A stable microwave source using frequency stabilized diode lasers was developed. The Doppler-free spectra of Rb atoms produced by saturated absorption spectroscopy were used to obtain highly-sensitive control signals and lock the frequency of diode lasers to it. The beat frequencies between two independently stabilized diode lasers were 1.2 GHz and 2.9 GHz. The fluctuations in beat frequencies were 40 kHz and 400 kHz respectively in the best stability.

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  • Residual Stress Analysis Based on Acoustic and Optical Methods. Reviewed International journal

    Sanichiro Yoshida, Tomohiro Sasaki, Masaru Usui, Shuichi Sakamoto, David Gurney, Ik-Keun Park

    Materials (Basel, Switzerland)   9 ( 2 )   1 - 24   2016.2

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    Co-application of acoustoelasticity and optical interferometry to residual stress analysis is discussed. The underlying idea is to combine the advantages of both methods. Acoustoelasticity is capable of evaluating a residual stress absolutely but it is a single point measurement. Optical interferometry is able to measure deformation yielding two-dimensional, full-field data, but it is not suitable for absolute evaluation of residual stresses. By theoretically relating the deformation data to residual stresses, and calibrating it with absolute residual stress evaluated at a reference point, it is possible to measure residual stresses quantitatively, nondestructively and two-dimensionally. The feasibility of the idea has been tested with a butt-jointed dissimilar plate specimen. A steel plate 18.5 mm wide, 50 mm long and 3.37 mm thick is braze-jointed to a cemented carbide plate of the same dimension along the 18.5 mm-side. Acoustoelasticity evaluates the elastic modulus at reference points via acoustic velocity measurement. A tensile load is applied to the specimen at a constant pulling rate in a stress range substantially lower than the yield stress. Optical interferometry measures the resulting acceleration field. Based on the theory of harmonic oscillation, the acceleration field is correlated to compressive and tensile residual stresses qualitatively. The acoustic and optical results show reasonable agreement in the compressive and tensile residual stresses, indicating the feasibility of the idea.

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  • Fundamental study of acoustic leakage through a gap between gasket and flange surface Reviewed

    Shuichi Sakamoto, Takanari Azami, Isami Nitta, Yosuke Tsukiyama

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   10 ( 4 )   1 - 18   2016

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    In this study, we theoretically and experimentally explore the acoustic leak of an entire acoustic system as well as the various gap occurring between a gasket and flange. We conducted the first-ever fundamental research related to sound transmission loss through a narrow gap between a gasket and flange. In the experiments, we constructed pipeline elements, including the gap and the leakage path, in the impedance measurement tube. In the theoretical analysis, we replaced the fluid path, including the gap, with acoustic elements that comprise an electrical equivalent circuit. We then conducted the analysis using the transfer matrix method. To calculate the attenuation of sound waves propagating through the gap, we considered friction in association with viscosity, primarily in the boundary layers of the inner wall, to derive the characteristic impedance and propagation constant. The trends between the calculated and the actual experimental values for transmission loss in the entire acoustic system coincided enough with regard to a large gap size range between 0.01 and 0.2 mm. Furthermore, the transmission loss linearly increased with the decreasing logarithm of gap for the calculated regions. Furthermore, the theoretical analysis and experimental results show agreement for incline gap conditions between the gasket and flange. The maximum gap also greatly affects the acoustic transmission loss for the inclined gaps. This was confirmed both by the experimental and the calculated values. We consider that these results provide fundamental acoustic knowledge specific to the narrow gap between the gasket and flange in an acoustic system.

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  • Sound Attenuation for Dogs Barking Using of Transfer Function Method Reviewed

    Shuichi Sakamoto, Takatsune Narumi, Yuichi Toyoshima, Nobuaki Murayama, Toru Miyairi, Akira Hoshino

    ADVANCEMENT OF OPTICAL METHODS IN EXPERIMENTAL MECHANICS, VOL 3   Cloud   153 - 160   2015

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    This paper reports a natural ventilation silencer for an animal cage having considerable sound insertion loss. Many veterinary hospitals face a serious problem that hospitalized animals are stressed from the barks of other dogs in the hospital. To address this problem, a solution that barely affects caged dogs' health is required. We attempted to use a silencer with sound insertion loss by attaching it to an opening side of the cage. We constructed the tested prototype silencers by using the resonance of a rectangular room and a nonwoven fabric. We measured the acoustic characteristics of the silencers that were attached to the real scale model of the animal cage. We also measured their insertion loss by considering the estimated frequency characteristics of the dogs' barking sound. The result shows that proposed silencers have more than 10 dB insertion loss; therefore, they can maintain respiratory environment of a caged dogs along with good visibility.

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  • Sound Attenuation for Dogs Barking Using of Transfer Function Method Reviewed

    Shuichi Sakamoto, Takatsune Narumi, Yuichi Toyoshima, Nobuaki Murayama, Toru Miyairi, Akira Hoshino

    ADVANCEMENT OF OPTICAL METHODS IN EXPERIMENTAL MECHANICS, VOL 3   153 - 160   2015

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    This paper reports a natural ventilation silencer for an animal cage having considerable sound insertion loss. Many veterinary hospitals face a serious problem that hospitalized animals are stressed from the barks of other dogs in the hospital. To address this problem, a solution that barely affects caged dogs' health is required. We attempted to use a silencer with sound insertion loss by attaching it to an opening side of the cage. We constructed the tested prototype silencers by using the resonance of a rectangular room and a nonwoven fabric. We measured the acoustic characteristics of the silencers that were attached to the real scale model of the animal cage. We also measured their insertion loss by considering the estimated frequency characteristics of the dogs' barking sound. The result shows that proposed silencers have more than 10 dB insertion loss; therefore, they can maintain respiratory environment of a caged dogs along with good visibility.

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  • Study of arrayed side branch silencer for ventilation door (Theoretical analysis and measurement of transmission loss) Reviewed

    Shuichi Sakamoto, Seiya Tatsuza, Munehiro Ishida, Arata Nakano, Kuniaki Nagai, Toshio Katou

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   9 ( 3 )   1 - 15   2015

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    This study focuses on acoustic silencers on indoor-use doors positioned in an array. In this paper, we discuss our studies of side branch silencers which are built in the ventilation door. By designing and fabricating a special attachment, we were able to attach silencers to the measurement tube that had larger cross sections than the impedance measurement tube. Using this attachment, we measured acoustic transmission losses for each of six different prototype silencers. By adding orifice silencer effects, we obtained transmission losses across a wide frequency range. However, attenuation decreased in frequency ranges below the attenuation peak of the side branch tubes. A wedge-shaped longitudinal cross section for the side branch tubes can double the length of the silencer and develop lower-frequency attenuation effects, while maintaining the same volume. This wedge-shaped side branch tube is suitable for a long silencer placed side by side in an array formation We performed theoretical analyses of acoustic transmission losses of silencers using the transfer matrix method based on a one-dimensional wave equation. We performed element decomposition on the transfer matrix for silencers with side branch tubes with a wedge-shaped longitudinal cross section. We obtained calculated results that were sufficiently valid compared to our experimental measurements.

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  • Study for louver with sound attenuating function using rectangular flat tubes of cross-sectional area decreasing along with longitudinal direction (Estimation and experiment of transmission loss) Reviewed

    Shuichi Sakamoto, Ryohei Sugahara, Soma Yamazaki, Toshihiro Nagumo, Hiromichi Kawase

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   9 ( 3 )   1 - 14   2015

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    In this paper, we propose a louver with a simple structure and a high aperture ratio. A louver element with a sound attenuating structure composed of layered two flat rectangular tubes, each of which is wedge-shaped with thickness decreasing toward the closed end, was constructed and experimentally and theoretically analyzed. Samples having more basic structures were also constructed and compared. In the theoretical analysis, the sound attenuation characteristics of a louver element were clarified considering sound attenuation in the clearance between two planes, as is typically observed in the flat rectangular tubes furnished in the louver element. To consider the sound attenuation due to the viscosity of the air in the rectangular tube, the propagation constant and characteristic acoustic impedance were derived using the Navier-Stokes equations, etc. Further, the sound transmission loss was calculated by the transfer matrix method. The tendency of the theoretical values in consideration of the attenuation of sound wave roughly agreed with the experimental values. Note that the attenuation of sound wave is evident in a thin or wedge-shaped tube and has to be considered in the theoretical analysis. The number of flat rectangular tubes was doubled without increasing the thickness of a louver element. The structure is useful as a louver slat because sound attenuation is achieved in a wide frequency range while maintaining a high aperture ratio.

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  • Estimation and experiment for sound absorption coefficient of cross-sectional shape of clearance by concentric cylinder Reviewed

    Shuichi Sakamoto, Arata Nakano, Hirohiko Tanikawa, Yuki Maruyama

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   9 ( 3 )   1 - 13   2015

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    There are engineering benefits if we can predict the acoustic properties such as the sound absorption coefficient of a sound incident on the clearance of such an annular cross-section based on the geometric dimensions of the tubes and the physical properties of the gas. However, a successful theory for the sound absorption coefficient of narrow tubes of the abovementioned shapes has not yet been presented, and the comparison between experimental and theoretical values has not been made. Further, the propagation constant and characteristic impedance in the clearance in a double cylinder have not yet been derived in the cylindrical coordinate system or by other methods. Therefore, in this paper, the propagation constant and characteristic impedance were derived by approximating clearance of an annular cross-section with clearance between two parallel planes. And the sound absorption coefficient was calculated, then compared with experimental results. The theoretical values, according to this method, agreed well with the experimental values, and practically sufficient accuracy was obtained. It was experimentally confirmed that the eccentricity of a round bar in a circular hole does not appreciably influence the sound absorption coefficient. Even when this calculation method is applied to a circular hole, the results agree with the theoretical and experimental values for the circular hole. Therefore, this method is effective even if the diameter of the internal cylinder is considerably smaller than that of the external cylinder.

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  • Study of sound-absorbing materials using layered narrow clearances between two surfaces (Theoretical analysis and experiments of Sensu (folding fan) shaped test samples) Reviewed

    Shuichi Sakamoto, Katsuya Higuchi, Shota Koseki

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   9 ( 5 )   1 - 15   2015

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    We conducted a study related to sound absorbing materials created by folding thin material in the shape of a Japanese folding fan. In order to conduct a calculation of the shape of a clearance in the folding fan-shaped test sample, we performed an approximation of element decomposition in both the incidence direction of the sound wave and the lateral direction. In a theoretical analysis, we considered sound wave attenuation due to boundary layer friction in the clearance between two surfaces. We compared experimental and calculated values for the sound absorption coefficient. Trends in both matched closely. Errors in the calculated values for large clearances could be attributed mainly to irregularity in the size of the clearances. Frequency shift of the calculated values for small clearances were due to errors in estimating the sound attenuation. Sound absorbing structures shaped like a folding fan possess sound absorption characteristics are similar to the wedge-shaped sound absorbing structures shown in previous reports. This was also shown in calculated values based on theoretical analysis. In cases with an appropriate back air space, sound absorption peak frequencies decreased relative to cases without a back air space, and sound absorption characteristics were superior across a wide frequency range.

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  • Theoretical analysis of the sound-absorption coefficient and transmission loss for longitudinal clearances among the close-packed cylinders (Three kinds of estimation and experiment) Reviewed

    Shuichi Sakamoto, Kouta Sutou, Arata Nakano, Hirohiko Tanikawa, Takanari Azami

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   9 ( 5 )   1 - 18   2015

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    This study estimates the sound-absorption coefficient and transmission loss for the dimensions of clearances among the close-packed cylinders by theoretical analysis and compares these estimates with experimental values. In the analysis, we performed an elemental breakdown of the clearance configuration, and then approached each element as the clearance between two planes. Considering the effects of sound wave attenuation in each element of clearance, we found the propagation constant and characteristic acoustic impedance using three-dimensional analysis. By connecting these elements in parallel, we treated them as a one-dimensional transfer matrix. We then calculated the sound-absorption coefficient and transmission loss through the transfer matrix method. No sound-absorption coefficient could be obtained with calculations that did not account for attenuation. In addition, calculations that approached the clearance as an equivalent circle and a triangle did not match experimental values well. On the other hand, calculations using the method that accounted for clearance shape, that is the method used in this study, closely matched experimental values. Estimations of transmission loss expressed all clearances by connecting their transfer matrices in parallel. In calculations, these estimations did not account for attenuation, and the falling curve for transmission loss greatly diverged from experimental values. In the three calculations that accounted for attenuation, the falling segment of transmission loss showed frequency characteristics that were close to experimental values. Calculations through the methods that accounted for clearance shapes and that analyzed clearance as an equivalent triangle also had peak transmission loss values that closely matched experimental values.

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  • Evaluation of sealing characteristics of copper gasket using lasermicroscope with wide field of view Reviewed

    Isami NITTA, YoshioMATSUZAKI, Yosuke TSUKIYAMA, Motoshi HORITA, Shuichi SAKAMOTO

    Transactions of the JSME (in Japanese)   80 ( 814 )   1 - 7   2014.6

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    To quantitatively predict leakage rates through gasket/flange interface, it is important to observe contact conditions at seal surfaces because the leakage path consists of the non-contact portions between the flange and gasket surfaces. The contact surfaces of the flanges were finished by lathe turning. In this study, we observed real contact area on gasket surfaces using a laser microscope with a wide field of view. The observations indicated that the leakage paths on the gasket surfaces were in the radial direction perpendicular to a lathe-turned groove and the circumferential direction along the groove. As the closing loads increased, the leakage paths in the radial direction disappeared and only the leakage path in the circumferential direction remained. The critical contact pressure where the leakage paths in the radial direction disappear was determined from the observation of the contact surface of the gasket. Over the critical contact pressure, the leakage rates obtained from the experiments showed good agreement with the calculated values under the assumption of laminar flow along the turned groove. Under the critical contact pressure, the recalculated values considered t

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  • Sound Attenuation Devices for Dogs Barking (Estimation of Aperture Ratio and Experimental Study of Silencer) Reviewed

    Shuichi Sakamoto, Yuichi Toyoshima, Nobuaki Murayama, Toru Miyairi, Akira Hoshino, Takatsune Narumi

    International Journal of Mechanical Engineering and Applications   2 ( 1 )   18 - 24   2014.3

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    This paper reports a natural ventilation silencer for an animal cage having considerable sound insertion loss. Many veterinary hospitals face a serious problem that hospitalized animals are stressed from the barks of other dogs in the hospital. To address this problem, a solution that barely affects caged dogs’ health is required. First, we estimated aperture ratio of the silencer device which was considered by physiological sustainability of dog. Next, we attempted to use a silencer with sound insertion loss by attaching it to an opening side of the cage. We constructed the tested prototype silencers by using the resonance of a rectangular room and a nonwoven fabric. We measured the acoustic characteristics of the silencers that were attached to the real scale model of the animal cage. We also measured their insertion loss by considering the estimated frequency characteristics of the dogs’ barking sound. The result shows that proposed silencers have more than 10 dB insertion loss; therefore, they can maintain respiratory environment of a caged dogs along with good visibility.

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  • Theoretical analysis for sound-absorbing materials using layered narrow clearances between two planes Reviewed

    Shuichi Sakamoto, Katsuya Higuchi, Kazuyuki Saito, Shota Koseki

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   8 ( 3 )   1 - 16   2014

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    We investigated the sound absorption coefficient within a sound-absorbing structure made of layered clearances between two planes. We discussed the experimental results from the existing literature and conducted a theoretical analysis on several different sound-absorbing structures that take into account the viscosity of the boundary layer at the clearances. First, we examined the case of thin sheets placed in parallel. Then, we examined the case where the size of the clearance continuously changed perpendicular to the direction of incidence of the sound waves. Subsequently, we examined the case where the clearance continuously decreased in the direction of incidence of the sound waves. In latter two cases, the transfer matrix used in the calculations was divided into elements perpendicular or coincident to the direction of incidence of the sound waves and the size of the clearance for each element was changed in a stepwise fashion. We then calculated the sound absorption coefficients for various structures and dimensions and observed that the calculated and experimental data agreed well. On the basis of the calculation simulation, the differences between the calculated and experimental absorption coefficient data were attributed mainly to the changes in the flexure of the sheet materials. The proposed calculation methods will be useful in determining the absorption coefficient of such shapes, and in the design of sound-absorbing materials that use such shapes.

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  • Theoretical analysis and measurement of sound transmission loss in louver elements with a sound attenuating function using a Helmholtz resonator array Reviewed

    Shuichi Sakamoto, Ryohei Sugahara, Toshihiro Nagumo, Arata Nakano, Hiromichi Kawase

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   8 ( 3 )   1 - 16   2014

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    This paper discusses a noise reduction structure with a thin Helmholtz resonator array integrated in louver elements. Using theoretical analysis, we derived the propagation constant and characteristic acoustic impedance with consideration for sound wave attenuation in the clearance between two planes for a thin cavity within the louver. The experiments with variation in three conditions were also performed: number of necks, internal thickness of the cavity, and number of partitions. Another experiment was conducted to verify that sound reduction characteristics change depending on the number of holes. The results closely matched with those calculated with consideration for attenuation, demonstrating the validity of the theoretical analysis. With respect to changes in the internal thickness of the cavity, experimental results showed that attenuation increased for clearances of 2 mm, causing significant differences in the sound reduction characteristics. At clearances of 8 mm, there was almost no attenuation in the clearance. Louvers with thin internal dimensions, in which holes diameter equal to the internal thickness of the cavity had been formed, created a larger effect than those with normal open end correction length. This resulted in a reduction in sound reduction frequency. Additionally, when cavities seen from the neck are created on the end face of the louver element as acoustic tubes, the properties of the acoustic tubes are added to the properties of the air spring. This achieved a significant reduction in the sound reduction peak frequency without increasing the volume of the cavity.

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  • Thorough Observation of Real Contact Area of Copper Gaskets Using a Laser Microscope With a Wide Field of View Reviewed

    Isami Nitta, Yoshio Matsuzaki, Yosuke Tsukiyama, Motoshi Horita, Shuichi Sakamoto

    JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME   135 ( 4 )   041103-1 - 041103-7   2013.10

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    To quantitatively predict the leakage rates of static metal seals, it is important to observe the real contact area at seal surfaces because the leakage path consists of the noncontact portions between the flange and gasket surfaces. In a previous study, we observed the real contact situation using a thin polymer film 1 mu m in thickness. In the present study, we observed the real contact area on gasket surfaces using a laser microscope with a wide field of view. With this method, observation time over the whole gasket surface could be greatly reduced compared with conventional methods. The observations indicated that the leakage paths on the gasket surfaces were in the radial direction perpendicular to a lathe-turned groove and the circumferential direction along the groove. As the closing loads increased, the leakage paths in the radial direction disappeared and only the leakage path in the circumferential direction remained. When the closing loads increased further, the widths of the leakage paths at both the inside and outside on the gasket surface became narrower. The critical contact pressure where the leakage paths in the radial direction disappear was determined from the observation of the contact surface of the gasket. The leakage rates obtained from the experiments showed good agreement with the calculated values under the assumption of laminar flow along the turned groove over the critical contact pressure.

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  • Frequency noise characteristics of a diode laser and its application to physical random number generation Reviewed

    Shinya Maehara, Kohei Kawakami, Hideaki Arai, Kenji Nakano, Kohei Doi, Takashi Sato, Yasuo Ohdaira, Shuichi Sakamoto, Masashi Ohkawa

    OPTICAL ENGINEERING   52 ( 1 )   1 - 7   2013.1

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    We describe a method of generating physical random numbers by means of a diode laser that has an extremely wide-band frequency-noise profile. Fluctuations in the laser frequency affect the intensity of the light transmitted through the optical frequency discriminator, detected thereafter as random fluctuations. This allows us to simultaneously generate 8 random bit streams, due to the parallel processing of 8-digit binary numbers sampled by an 8-bit analog-to-digital converter. Finally, we generated physical random numbers at a rate of 3 Gbit/s, by combining one data stream with another stream that is delayed by 2 ms, by exclusive-OR. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI. [DOI: 10.1117/1.OE.52.1.014302]

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  • Estimating sound-absorption coefficient and transmission loss by the dimensions of bundle of narrow holes (Comparison between theoretical analysis and experiments) Reviewed

    Shuichi Sakamoto, Akira Hoshino, Kouta Sutou, Takashi Sato

    Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C   79 ( 807 )   4164 - 4176   2013

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    Narrow hole bundle structures, whether or not designed for use as sound-absorbing materials and silencers, are frequently observed in catalysts and honeycomb constructions. Being able to make an accurate estimation of the sound-absorption coefficient and transmission loss with respect to such narrow hole bundle structures by using just their dimensions is important. Therefore, in this study, the authors attempted to develop a theoretical estimation method and verified its effectiveness by comparing the results with those of experiments that were performed using two-microphone and four-microphone impedance tubes. Primarily, a propagation constant and the characteristic impedance of sound propagation in a cylindrical narrow tube, which is based on a two-dimensional cylindrical coordinate system analysis including attenuation, was used to perform calculations for precision estimation. Next, an accurate propagation constant and characteristic impedance based on a two-dimensional analysis were converted and introduced to one-dimensional axial coordinate system analysis based on a transfer matrix. The developed method proved to be capable of making an accurate estimation by a simple process using a one-dimensional transfer matrix that is generally used for designing silencers. © 2013 The Japan Society of Mechanical Engineers.

    DOI: 10.1299/kikaic.79.4164

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  • Theoretical Analysis and Measurement of Sound Transmission Loss in Louver Elements with a Sound Attenuating Function Using a Narrow Tube Array

    坂本秀一, 佐藤北斗, 山崎実, 菅原諒平, 川瀬寛道

    日本機械学会論文集 C編(Web)   79 ( 804 )   2013

  • Theoretical analysis and measurement of sound transmission loss in louver elements with a sound attenuating function using a narrow tube array Reviewed

    Shuichi Sakamoto, Hokuto Sato, Minoru Yamazaki, Ryohei Sugahara, Hiromichi Kawase

    Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C   79 ( 804 )   2817 - 2829   2013

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    Sound transmission loss is relatively small in thin louver boards with a high aperture ratio. This study investigated louver elements with a sound attenuating function. Using narrow tubes, an array silencer was built into composite louver boards and a high aperture ratio was maintained. Several constructions for such louvers were prototyped, measured, and analyzed theoretically. Sound transmission loss was measured using four-microphone impedance tube. Then, sound transmission loss was calculated by a transfer matrix based on one-dimensional axial coordinate system analysis. The attenuation of sound in tubes should be calculated because a thin louver board must comprise narrow tubes. Therefore, an accurate propagation constant and a characteristic impedance based on two-dimensional analysis were introduced to enable theoretical analysis. The calculation results, including attenuation, and the experimental results had good coincidence. Moreover, the theoretical analysis confirmed that the silencer worked effectively and could be applied to silencer designs. © 2013 The Japan Society of Mechanical Engineers.

    DOI: 10.1299/kikaic.79.2817

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  • Basic Study for Acoustic Absorption Characteristics of Soft and Light Granular Material Reviewed

    Shuichi Sakamoto, Masaru Sasaki, Itaru Kourakata, Kensaku Yanagimoto, Seiji Watanabe

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   7 ( 4 )   677 - 689   2013

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    In this paper fundamental sound absorption characteristics of expanded polystyrene beads with several geometries are reported when they are packed in some thick layers with and without back air space. The normal incidence sound absorption coefficients, which were obtained by the experiments using two-microphone impedance tube, were evaluated comparing to theoretical estimations. Experimental data were also compared to the similar conditions but hard material particles like glass beads whose acoustic property was investigated by Sakamoto et. al. in a preceding study. Then following results were obtained; packed layer with expanded polystyrene beads has almost equal sound absorption coefficient to the similar layer with hard and solid material: numerical estimation of sound absorption coefficient is valid enough except for the case having large back air space: lowering peak frequency of sound absorption coefficient is available by overfilling and compressing particles. The authors also consider that applying soft, light, and low cost material to the sound absorbing structures is very meaningful. Because human damage caused by falling of wall and ceiling panel of buildings is avoidable particularly under an earthquake attack.

    DOI: 10.1299/jamdsm.7.677

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  • Theoretical Analysis and Measurement of Sound Transmission Loss in Louver Elements with a Sound Attenuating Function Using a Narrow Tube Array Reviewed

    Shuichi Sakamoto, Hokuto Sato, Minoru Yamazaki, Ryohei Sugahara, Hiromichi Kawase

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   7 ( 4 )   690 - 705   2013

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    Sound transmission loss is relatively small in thin louver boards with a high aperture ratio. This study investigated louver elements with a sound attenuating function. Using narrow tubes, an array silencer was built into composite louver boards and a high aperture ratio was maintained. Several constructions for such louvers were prototyped, measured, and analyzed theoretically. Sound transmission loss was measured using four-microphone impedance tube. Then, sound transmission loss was calculated by a transfer matrix based on one-dimensional axial coordinate system analysis. The attenuation of sound in tubes should be calculated because a thin louver board must comprise narrow tubes. Therefore, an accurate propagation constant and a characteristic impedance based on two-dimensional analysis were introduced to enable theoretical analysis. The calculation results, including attenuation, and the experimental results had good coincidence. Moreover, the theoretical analysis confirmed that the silencer worked effectively and could be applied to silencer designs.

    DOI: 10.1299/jamdsm.7.690

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  • Attenuation characteristics of double orifice silencer jointed by permeable membrane (measurement and theoretical analysis of sound transmission loss) Reviewed

    Shuichi Sakamoto, Toru Miyairi, Akira Hoshino, Itaru Kourakata, Takashi Sato

    Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C   79 ( 806 )   3474 - 3486   2013

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    This study deals with the attenuation characteristics of a double orifice silencer on ventilation holes. In this study, we inserted a tubular sheet of nonwoven fabric between the two orifices to improve the dip characteristics of the silencer. Then, we measured the sound transmission loss of the silencer with a four-microphone impedance tube. Simple double orifice silencers can be analyzed in one-dimension, but the acoustical analysis of the nonwoven fabric sheet is much difficult. In addition, in one- dimensional analysis, we must deal with the acoustical model with regard to the radial direction transparency of sound through the nonwoven fabric sheet. The sound transmission loss of the double orifice silencer, which bridged the nonwoven fabric sheet, was calculated via one-dimensional analysis. In addition, in this analysis, the acoustical constants of the nonwoven fabric sheets measured by the "two-cavity method" were installed in an equivalent circuit. It was observed that the analysis and the experimental results were in similar trend. © 2013 The Japan Society of Mechanical Engineers.

    DOI: 10.1299/kikaic.79.3474

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  • An Artificial Larynx Built in TE Shunt Valve That Produces Substitute Voice by Only Patient's Own Expiration Reviewed

    Itaru Kourakata, Shuichi Sakamoto, Yota Nakao

    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING   7 ( 4 )   777 - 790   2013

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    A large portion of patients of larynx cancer tekes total laryngectomy and loses their original voice consequently. Some ways to obtain substitute voice for total laryngectomees have been presented, however, each of them cannot conquer inconveniences, tone quality, extremely low tone, monotonousness etc. We invented very simple, small enough to be built in TE (tracheaesophageal) shunt valve but functional substitute voice that is driven by patient's own expiration and its tone pitch can be controlled by expiratory pressure simultaneously. The new device has an outward-striking membrane as an oscillating valve and a set of piston-cylinder mechanism, which controls oscillator's tension and alters pitch of sound. As results of performance experiments applied to the prototype model made as twice scale as an actual dimension, the device produces the lowest sound frequency of 205 Hz and pitch range of 374 cent being approximately proportional to driving air pressure between 0.8 and 2.2 kPa. It is said that normal pitch of female voice is around 210 Hz, thus we consider the possibility of the device as a new substitute voice was shown that contributes to improvement of total laryngectomees' QOL particularly to female patients.

    DOI: 10.1299/jamdsm.7.777

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  • Experimental studies on the sound absorbing materials by using of the bundle of narrow clearances between two planes Reviewed

    Shuichi Sakamoto, Kazuyuki Saito, Nobuaki Murayama, Katsuya Higuchi

    Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C   79 ( 807 )   4141 - 4152   2013

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    In this study, the sound-absorption coefficients of the sound-absorbing structure using bundle of narrow clearances between a number of thin plates were measured for various formations and size. It is found by the experiment that, when the clearance between thin plates is reduced, the peak sound absorption value is increased and the frequency decreases. This phenomenon is related to velocity boundary layer thickness. Therefore, its occurrence is limited to clearances of 70 microns or more. When the clearances decrease in depth, the absorption coefficient is high compared with the case where clearances remain constant. This decrease also tends to improve the dip in the frequency characteristic curve of the absorption coefficient. However, when the clearances change to lateral direction continuously, this dip is not improved. When the amounts of materials constituting thin plates are identical, sound absorption performance of a folding-fan-type sound-absorbing structure is equivalent to a wedge-shaped sound-absorbing structure © 2013 The Japan Society of Mechanical Engineers.

    DOI: 10.1299/kikaic.79.4141

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  • International Exchanges for Aspiring Students in Engineering Field Invited Reviewed

    T. Sato, S. Sakamoto, T. Shimizu, H. Ikeda, T. Oka

    Journal of Engineering Education Research   15 ( 4 )   3 - 7   2012.7

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  • Basic Study for the Acoustic Characteristics of Granular Material (Normal Incidence Absorption Coefficient for Multilayer with Different Grain Diameters) Reviewed

    Shuichi SAKAMOTO, Yosuke SAKUMA, Kensaku YANAGIMOTO, Seiji WATANABE

    Journal of Environment and Engineering   7 ( 1 )   12 - 22   2012.3

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    In this paper, several diameter of solid glass spherical grain was dealt. Each diameter grain has the each characteristic impedance and the complex wave constant. At first, the characteristic impedance and the complex wave constant for each grain diameters were measured. Then, the normal incidence absorption coefficient of each grain diameters for arbitrary layer thickness can be calculated. Likewise, the normal incidence absorption coefficient for multilayer with different grain diameters and arbitrary thicknesses can be calculated. This calculation process is comparatively lengthy, so the experiments for real multilayer and the calculations were compared. Result of the calculations coincided to the experiments. Consequently, calculation result of normal incidence absorption coefficient for multilayer with different grain diameters is useful.

    DOI: 10.1299/jee.7.12

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  • Sound Quality for Micro Axial Fan with Blade Run-Out Reviewed

    Kensaku YANAGIMOTO, Seiji WATANABE, Masayuki TAKAHASHI, Shuichi SAKAMOTO

    Journal of Environment and Engineering   7 ( 1 )   1 - 11   2012.3

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    This paper describes sound quality changes caused by a sound aerodynamic failure in a micro-axial fan when applying acoustic diagnostic methods at a cooling fan motor assembly line. The aerodynamic failure sound was focused to a rotational fan blade tone and a blade passing noise with a change in the fan blade run-out. Experimentally obtained results clarified the correlation between the sound quality metrics (Sharpness, Roughness, Fluctuation strength, Tone-to-noise ratio) and the blade run-out. Furthermore, an acoustic diagnosis technique for fan blade run-out is proposed using an adaptive spectrum enhancer. This proposed acoustic diagnosis technique is used for an adaptive feedback algorithm using an internal model control architecture to extract an abnormal periodic signal including aerodynamic sound generated by a rotating micro-axial fan. The experimentally obtained results show that the blade passing sound signal with the blade run-out change was improved by about 10 dB using this adaptive feedback algorithm.

    DOI: 10.1299/jee.7.1

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  • An artificial larynx built in TE shunt valve that produces substitute voice by only patient's own expiration (Preliminary study for suitable tone pitch and its controllability) Reviewed

    Itaru Kourakata, Shuichi Sakamoto, Yota Nakao

    Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C   78 ( 792 )   3053 - 3063   2012

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    A large portion of patients of larynx cancer tekes total laryngectomy and loses their original voice consequently. Some ways to obtain substitute voice for total laryngectomees have been presented, however, each of them cannot conquer inconveniences, tone quality, extremely low tone, monotonousness etc. We invented very simple, small enough to be built in TE (tracheaesophageal) shunt valve but functional substitute voice that is driven by patient's own expiration and its tone pitch can be controlled by expiratory pressure simultaneously. The new device has an outward-striking membrane as an oscillating valve and a set of piston-cylinder mechanism, which controls oscillator's tension and alters pitch of sound. As results of performance experiments applied to the prototype model made as twice scale as an actual dimension, the device produces the lowest sound frequency of 205 Hz and pitch range of 374 cent being approximately proportional to driving air pressure between 0.8 and 2.2 kPa. It is said that normal pitch of female voice is around 210 Hz, thus we consider the possibility of the device as a new substitute voice was shown that contributes to improvement of total laryngectomees' QOL particularly to female patients. © 2012 The Japan Society of Mechanical Engineers.

    DOI: 10.1299/kikaic.78.3053

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  • Detection of Leak of Hollow Optical Fiber Using Acoustics (Experiments and Theoretical Analysis) Reviewed

    Shuichi SAKAMOTO, Takayasu NAGASE, Masaya NAKAGAWA, Isami NITTA, Kensaku YANAGIMOTO, Seiji WATANABE

    Transactions of the Japan society of Mechanical Engineers, Series C   77 ( 777 )   2096 - 2106   2011.5

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    In this paper, the problem in the CO2 infrared laser medical operation device that propagates the laser in the hollow optical fiber was dealt. There is risk of the accident of damaging by a fire when leak is opened in the hollow optical fiber, and the laser light is discharged outside. This study is the detecting method for the leak on hollow optical fiber by using the sound. A basic experiment concerning this method and comparison result between the theoretical analysis and the experiment are reported. The leakage of the narrow tube with large attenuation can be detected. The experiment was corresponding to the tendency to the theoretical analysis for the presence of the leakage and the change in the hole diameter. This method is inexpensive than the method of adding the optical device, it makes small hand peace, and doesn't ruin handling that is the advantage of the hollow optical fiber.

    DOI: 10.1299/kikaic.77.2096

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  • Study for Sound Absorbing Materials of Biomass Tubule etc. (Measured Result for Rice Straw, Rice Husks, and Buckwheat Husks) Invited Reviewed

    Sakamoto, S. Takauchi, Y. Yanagimoto, K. Watanabe

    Journal of Environment and Engineering   6 ( 2 )   352 - 364   2011.3

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    The porous material with continuous pore is useful for the sound absorbing material. In this research work, rice straw, rice husks, and buckwheat husks were dealt as a porous sound absorbing material that applied the biomass. About rice straw, geometrical condition of that was reproduced in the narrow tube of the simple structure, and the effect of absorbing sound of the tubule in the composite structure was verified. In the experiment, for the various thickness and the back air space were tested by using two microphone impedance tube, and the normal incidence sound absorption coefficient was measured. Moreover, the absorption coefficient was calculated from the acoustical constant obtained from the result of a measurement in a specific condition. And, these calculation values were compared with experiment values. As a result, it was shown to be able to estimate the absorption coefficient of the condition of the unmeasurement. As for rice straw, rice husks, and buckwheat husks, it has been understood it has a useful characteristic of absorbing sound. It leads to the fixation of the carbon, and even if the incineration processing is done, it is a carbon neutral.

    DOI: 10.1299/jee.6.352

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  • International Cooperative Activities for the Engineering Education between Otto-von-Guericke-University Magdeburg, Germany, and Niigata University, Japan Invited Reviewed

    T. Sato, L. Wisweh, S. Sakamoto, T. Shimizu, H. Ikeda, T. Oka, Y. Tanabe

    Journal of Engineering Education Research   13 ( 5 )   49 - 54   2010.10

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  • Basic study for acoustic absorption characteristics of soft and light granular material (basic characteristics for expanded polystyrene beads) Reviewed

    Shuichi Sakamoto, Masaru Sasaki, Itaru Kourakata, Kensaku Yanagimoto, Seiji Watanabe

    Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C   76 ( 770 )   2545 - 2551   2010

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    In this paper fundamental sound absorption characteristics of expanded polystyrene beads with several geometries are reported when they are packed in some thick layers with and without back air space. The normal incidence sound absorption coefficients, which were obtained by the experiments using two-microphone impedance tube, were evaluated comparing to theoretical estimations. Experimental data were also compared to the similar conditions but hard material particles like glass beads whose acoustic property was investigated by Sakamoto et. al. in a preceding study. Then following results were obtained
    packed layer with expanded polystyrene beads has almost equal sound absorption coefficient to the similar layer with hard and solid material : numerical estimation of sound absorption coefficient is valid enough except for the case having large back air space : lowering peak frequency of sound absorption coefficient is available by overfilling and compressing particles. The authors also consider that applying soft, light, and low cost material to the sound absorbing structures is very meaningful. Because human damage caused by falling of wall and ceiling panel of buildings is avoidable particularly under an earthquake attack.

    DOI: 10.1299/kikaic.76.2545

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  • Study for sound absorbing materials of biomass tubule etc. (measured result for rice straw, rice husks, and buckwheat husks) Reviewed

    Shuichi Sakamoto, Yuki Takauchi, Kensaku Yanagimoto, Seiji Watanabe

    Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C   75 ( 760 )   3223 - 3229   2009.12

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    The porous material with continuous pore is useful for the sound absorbing material. In this research work, rice straw, rice husks, and buckwheat husks were dealt as a porous sound absorbing material that applied the biomass. About rice straw, geometrical condition of that was reproduced in the narrow tube of the simple structure, and the effect of absorbing sound of the tubule in the composite structure was verified. In the experiment, for the various thickness and the back air space were tested by using two microphone impedance tube, and the normal incidence sound absorption coefficient was measured. Moreover, the absorption coefficient was calculated from the acoustical constant obtained from the result of a measurement in a specific condition. And, these calculation values were compared with experiment values. As a result, it was shown to be able to estimate the absorption coefficient of the condition of the unmeasurement. As for rice straw, rice husks, and buckwheat husks, it has been understood it has a useful characteristic of absorbing sound. It leads to the fixation of the carbon, and even if the incineration processing is done, it is a carbon neutral.

    DOI: 10.1299/kikaic.75.3223

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  • Study for acoustic characteristics variation of granular material by water content Reviewed

    Shuichi Sakamoto, Yuji Tsutsumi, Kensaku Yanagimoto, Seiji Watanabe

    Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C   75 ( 757 )   2515 - 2520   2009

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    In this paper, variation of airborne sound absorption coefficient for granular material with small quantity water is dealt. The granular matter under the test is solid glass spherical grain as diameter 1 mm. The relationship between water content by volume and absorption coefficient for each thickness of layer is measured by experiments. And tortuosity as one of the Biot's parameters is also measured by ultrasonic. It was proved that peak frequency of absorption coefficient decreases as increasing of water content. The reason is that reduced virtual sound velocity makes effect of larger sample thickness. Result of this study is useful for expecting absorption coefficient of wet or liquid bonded granular matter.

    DOI: 10.1299/kikaic.75.2515

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  • Sound quality for micro axial fan with blade run-out Reviewed

    Kensaku Yanagimoto, Seiji Watanabe, Masayuki Takahashi, Shuichi Sakamoto

    Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C   75 ( 752 )   1194 - 1200   2009

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    This paper describes a sound quality change caused by a failure aerodynamic sound in a micro axial fan in order to apply an acoustic diagnosis at cooling fan motor assembly line. The failure aerodynamic sound is focused to a rotational fan blade tone and blade passing noise with fan blade run-out change. In this experimental result, a correlation between the sound quality metrics (Sharpness, Roughness, Fluctuation strength, Tone to-noise ratio) and the blade run-out is cleared. In addition, an acoustic diagnosis technique for a fan blade run-out is proposed using an adaptive spectrum enhancer. This proposed acoustic diagnosis technique is used to adaptive feedback algorithm using internal model control architecture to extract a periodic abnormal signal including aerodynamic noise generated by rotating a micro axial fan. As the experimental results, the blade passing sound signal with the blade run-out change was improved about 10 dB by using this adaptive feedback algorithm.

    DOI: 10.1299/kikaic.75.1194

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  • Basic Study for the Acoustic Characteristics of Granular Material (Normal Incidence Absorption Coefficient for Multilayer with Different Grain Diameters):Normal Incidence Absorption Coefficient for Multilayer with Different Grain Diameters Reviewed

    SAKAMOTO Shuichi, SAKUMA Yosuke, YANAGIMOTO Kensaku, WATANABE Seiji

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C   74 ( 745 )   2240 - 2245   2008.9

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    In this paper, several diameter of solid glass spherical grain was dealt. Each diameter grain has the each characteristic impedance and the complex wave constant. At first, the characteristic impedance and the complex wave constant for each grain diameters were measured. Then, the normal incidence absorption coefficient of each grain diameters for arbitrary layer thickness can be calculated. Likewise, the normal incidence absorption coefficient for multilayer with different grain diameters and arbitrary thicknesses can be calculated. This calculation process is comparatively lengthy, so the experiments for real multilayer and the calculations were compared. Result of the calculations coincided to the experiments. Consequently, calculation result of normal incidence absorption coefficient for multilayer with different grain diameters is useful.

    DOI: 10.1299/kikaic.74.2240

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  • Attenuation Effects of Discrete Tone Using Adaptive Feedback Active Noise Control Reviewed

    Seiji WATANABE, Kensaku YANAGIMOTO, Katsuya TANIFUJI, Shuichi SAKAMOTO, Masayuki TAKAHASHI, Ryoichi ICHIMIYA

    Journal of Environment and Engineering   2 ( 3 )   470 - 479   2007.3

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    The attenuation characteristics of a slit resonator that combined the adaptive feedback ANC system at a ventilation aperture of the package for leakage noise is investigated. The discrete tones radiated from an AC axial flow fan are controlled by DSP using Filtered-X Least Mean Square algorithm. The attenuation is found at the range of: 3<i>dB</i>-14<i>dB</i> with circular slit resonator, 2<i>dB</i>-15<i>dB</i> with elliptic slit resonator. Results of measurement show that the proposed system can achieve TNR(Tone to Noise Ratio) and PR(Prominence Ratio) under threshold effectively.

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  • Attenuation Effects of Discrete Tone Using Adaptive Feedback Active Noise Control Reviewed

    WATANABE Seiji, YANAGIMOTO Kensaku, TANIFUJI Katsuya, SAKAMOTO Shuichi, TAKAHASHI Masayuki, ICHIYAMA Ryoichi

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C   71 ( 701 )   327 - 334   2005.1

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    The attenuation characteristics of a slit resonator that combined the adaptive feedback ANC system at a ventilation aperture of the package for leakage noise is investigated. The discrete tones radiated from an AC axial flow fan are controlled by DSP using Filtered-X Least Meane Square algorithm. The attenuation is found at the range of : 3dB-14dB with circular slit resonator, 2dB-15dB with elliptic slit resonator. Results of measurement show that the proposed system can achieve TNR (Tone to Noise Ratio) and PR (Prominence Ratio) under threshold effectively.

    DOI: 10.1299/kikaic.71.327

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  • Measurement of the Height for Granular Material Level in a Cylinder Using Sound : Fundamental Experiments for Glass Beads and Theoretical Analysis Reviewed

    SAKAMOTO Shuichi, TAKAI Kotaro, FUKAI Yuji, YANAGIMOTO Kensaku, WATANABE Seiji, ICHIMIYA Ryoichi

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C   70 ( 691 )   679 - 686   2004.3

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    This paper deals with the development of a new method for measurement of the height for granular material in a cylinder. For monitoring of automated filling processes of cartridges in a series production a new measurement method was developed which allows to detect rapidly incorrect products and to improve the process capability by the use of this method. The aim of this research work is to measure the level of granular material in a cartridge without contacting the material. The material is the mixture of the solid particles and air. The material is assumed as the porous media from the viewpoint of acoustics. As that, the inside of the cartridge, which is filled with granular material, is the acoustic system including porous media. The measuring method used the relationship between amount of granular meterial in the cartridge and the characteristics of the transfer function of the acoustic system is developed. The acoustic characteristic of the granular material, which is used for the theoretical analysis was also measured.

    DOI: 10.1299/kikaic.70.679

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  • Non-Contact Discrimination Method of the Form of Powder Materials in Plastic Bag by Sound Reviewed

    SAKAMOTO Shuichi, TAKAHATA Masashi, YANAGIMOTO Kensaku, WATANABE Seiji, ICHIMIYA Ryoichi

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C   69 ( 677 )   42 - 48   2003.1

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    This paper deals with the development of a new method for determination of powder form materials in plastic bag by sound. It is useful to determine the kind of powder form materials in the opaque plastic bag without open or contact. This detector utilizes the variation of the amplitude of the frequency response within entire acoustic system. The incident impedance of powder form materials varies with the diameter of particles and so on. For contactless determination, small distance gap between face of detector and plastic bag is adopted. Characteristic acoustic impedance and complex wave number are measured by the transfer function method. These measured parameters of powder form materials are introduced into theoretical analysis. The trends of the experiments and theory show good coincidence.

    DOI: 10.1299/kikaic.69.42

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  • Sound Radiation from Ventilation Aperture with Circular Thin Air Layer Setting up Machinery Wall : Noise Attenuation by Using Active Noise Sources Reviewed

    WATANABE Seiji, YANAGIMOTO Kensaku, TANIFUJI Katsuya, SAKAMOTO Syuhichi, ITOH Takahiro, ICHIMIYA Ryohichi

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C   68 ( 674 )   3122 - 3129   2002.10

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    This paper describes insulation characteristics of slit resonator that a single channel ANC system for silencing leakage noise at ventilation aperture of package. The circular slit resonator composed of thin air layer that is radial expansion with very short axial length was set up package wall. The circular thin air layer is driven by one to four speakers that are controlled using Filtered-X-LMS algorithm to minimize sound power at error microphone. The experimental results show that the noise reduction region spreads to the high frequency side, as the slit depth decreases. The noise reduction quantity increases, as the slit width widens. Visualization of SPL and phase on the circular slit resonator indicate that the noise reduction mechanism is the interference of control sound and noise.

    DOI: 10.1299/kikaic.68.3122

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  • Method of Detecting Number of Sheets Using Sound (5th Report, Non-Contact Measurement by Using Acoustic Characteristics of Cloths) Reviewed

    SAKAMOTO Shuichi, ICHIMIYA Ryoichi, ISHIBASHI Junichi, SATO Taiki

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C   67 ( 657 )   1276 - 1281   2001.5

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    This paper deals with the development of a new method for detecting the number of cloth without contact. It is necessary to detect one or plural number of sheets to avoid mishandling. This detecting sensor utilizes the variation of the phase of the transfer function within entire acoustic system. The incident impedance of sheets varies with the number of sheets. Characteristic acoustic impedance and complex wave number define peculiar and most fundamental characteristics of the material. It is useful for the detection of the number of cloth to know characteristic impedance of cloth. So that, we tried to measure characteristic impedance and wave number. The measured impedance of sheets by the transfer function method was introduced into theoretical analysis. The results of the experiments and theoretical analysis show fairly good coincidence

    DOI: 10.1299/kikaic.67.1276

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  • 414 Method of Detecting Number of Sheets Using Sound : Non-Contact Measurement by Using of Acoustic Characteristics of Cloths

    SAKAMOTO Shuichi, ISHIBASHI Junichi, SATO Taiki, ICHMIYA Ryoichi

    The Proceedings of Conference of Hokuriku-Shinetsu Branch   2000.37   147 - 148   2000

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    DOI: 10.1299/jsmehs.2000.37.147

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  • Method of Detecting Number of Cloths Using Sound. Fundamental Experiment of Acoustic Characteristics Measurement of Cloths. Reviewed

    坂本秀一, 一宮亮一, 玉橋知之, 石橋淳一

    日本機械学会北陸信越支部総会・講演会講演論文集   64巻, 619号   986 - 991   1998.3

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  • Measurement of Cylinder Configuration Using Sound Phase Delay (2nd Report, Study on Improving the Accuracy of Measurement) Reviewed

    AIDA Shuhei, ICHIMIYA Ryoichi, YAMADA Masanao, SAKAMOTO Shuichi

    Transactions of the Japan Society of Mechanical Engineers. Series C.   63 ( 610 )   1989 - 1995   1997.6

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    In this paper, we discuss the development of a new noncontact method for determining cylinder configurations using sound phase delay, In order to improve the accuracy of the measurements, the effect of the cavity in which the cylinder is placed has been studied. When the cylinder is placed near a side wall of the cavity, the phase delay angle increases, particularly for cylinders with odd periodic deflection. Thus, by varying the gap between the cylinder and the side wall, it is possible to determine the cylinder configuration even if the deflections are small. We propose a new method, in which the influence of noise is avoided by measuring the noise interference using a pair of microphones in the cavity.

    DOI: 10.1299/kikaic.63.1989

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  • Measurement of Cylinder Configuration Using Sound Phase Delay. Reviewed

    AIDA Shuhei, ICHIMIYA Ryoichi, YAMADA Masanao, SAKAMOTO Shuichi, MATSUMURA Shigeo

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C   62 ( 603 )   4250 - 4256   1996.11

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    Recently, noncontact method for measuring cylinder configurations are required in industry. This paper reports the development of a new method for measuring cylinder configurations, using sound signal without contacting the contour surface. This method is based on the fact that the phases of sound waves scattered by a cylinder are delayed according to the diameter of the cylinder. Experiments were performed for various cylinder configurations formed by single and plural periodical deflection, using a loudspeaker, microphone and FFT-analyzer. It was found that the phase delays of sound waves were periodically changed according to the revolution of the cylinder, and the period between the phase delay and cylinder deflection was in good agreement. In addition, the angle of phase delay was linearly proportional to the magnitude of deflection.

    DOI: 10.1299/kikaic.62.4250

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    Other Link: http://www.jstage.jst.go.jp/article/kikaic1979/62/603/62_603_4250/_pdf

  • Measurement of Water Level and Slant Angle Using Sound Signal. Reviewed

    島崎義之, 一宮亮一, 坂本秀一, 田中誠三

    日本機械学会論文集 C編   62 ( 595 )   949 - 954   1996.3

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  • "jointly worked" Reviewed

    Transactions of the Japan society of Mechanical Engineers, Series C   61 ( 584 )   1516 - 1521   1995.4

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    DOI: 10.1299/kikaic.61.1516

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  • A NEW MEASURING METHOD FOR UNDERWATER DISPLACEMENT UTILIZING SOUND SIGNAL - (EXPERIMENTAL RELATIONSHIP BETWEEN SOUND FREQUENCY AND DISPLACEMENT) Reviewed

    Y SUZUKI, R ICHIMIYA, T WATANABE, S SAKAMOTO

    JSME INTERNATIONAL JOURNAL SERIES C-DYNAMICS CONTROL ROBOTICS DESIGN AND MANUFACTURING   38 ( 1 )   42 - 47   1995.3

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    This paper deals with a newly developed underwater displacement sensor utilizing the acoustic resonant frequency of water in a submerged pipe. Both ends of the pipe are closed. A speaker to generate sound is fixed on the end of the pipe with the reflector at the other end. A piezoelectric ceramic is used as a speaker. Sweeping signal is radiated from the speaker to the water column in the pipe. The sound pressure takes the largest value at the resonant frequency. The displacement of the reflector which is inserted from the other end of the pipe by the plunger, corresponds to the length of the water column. The displacement of the reflector has good correspondence to the resonant frequency of the water column. It is found from the experiment that it is possible to measure accurately underwater displacement using this sensor.

    DOI: 10.1299/jsmec1993.38.42

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  • Method of Detecting Number of Sheets Using Sound. 2nd Report. Detection of Moving Sheets. Reviewed

    坂本秀一, 一宮亮一, 太田雄三

    日本機械学会論文集 C編   60 ( 571 )   994 - 999   1994.3

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  • Sound-Based Detection Method of Number of Sheets Reviewed

    Shuichi SAKAMOTO, Ryoichi ICHIMIYA, Yuzo OHTA

    Journal of AdvancedAutomation Tech-nology   6 ( 1 )   42 - 49   1994.1

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  • Detecting Method of Number of Sheets by Using Sound Reviewed

    Sakamoto Shuichi, Ichimiya Ryoichi, Ohta Yuzo

    Transactions of the Japan Society of Mechanical Engineers. Series C.   59 ( 559 )   819 - 826   1993.3

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    This paper deals with the development of a new detecting method of a number of sheets without contact. For example, in a cash dispenser paper sheets are transferred one by one and counted synchronously. So it is necessary to detect one or a plural number of sheets to avoid mistransferring. Hitherto, the contact measuring method has been used for detecting the transference of sheets. This noncontact sensor utilizes the variations of frequency response of the whole acoustic system of the sensor with sheets which are set near the sensor. The impedance of sheets varies with its number. The number of sheets has shown good correspondence with the resonant frequency and frequency response of the acoustic system. An electrical analogy is adopted for theoretical analysis of the acoustic system. The results of the calculation and experiments coincide significantly. It is possible to detect the number of sheets within a very short time period by means of variations of the frequency response.

    DOI: 10.1299/kikaic.59.819

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    Other Link: http://hdl.handle.net/10191/5797

  • A New Measuring Method for Underwater Displacement,Utilizing Sound Signal (Experimental Relationship between Sound Frequency and Displacement) Reviewed

    Yuji SUZUKI, Ryoichi ICHIMIYA, Tomoyuki WATANABE, Shuichi SAKAMOTO

    Transactions of the Japan society of Mechanical Engineers, Series C   59 ( 558 )   587 - 592   1993.2

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    This paper deals with a newly developed underwater displacement sensor utilizing the acoustic resonant frequency of water in a submerged pipe. Both ends of the pipe are closed. A speaker to generate sound is fixed on the end of the pipe with a reflector at the other end. Piezoelectric ceramic is used as a speaker. A sweep signal is radiated from the speaker to the water column in the pipe. The sound pressure takes the largest value at the resonant frequency. The displacement of the reflector which is inserted from another end of the pipe by a plunger, corresponds to the length of the water column. The displacement of the reflector has good correspondence to the resonant frequency of the water column. It is found from the experiment that it is possible to accurately measure underwater displacement, using this sensor.

    DOI: 10.1299/kikaic.59.587

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    Other Link: http://hdl.handle.net/10191/5909

  • A New Measuring Method of Displacement by Means of Variations of Sound Frequency and the Length of Air Column in a Small Pipe. Electric Acoustic Noncontact Displacement Sensor. Reviewed

    坂本秀一, 一宮亮一

    日本機械学会北陸信越支部総会・講演会講演論文集   58 ( 555 )   3259 - 3264   1992.11

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  • A NEW METHOD OF MEASURING DISPLACEMENT BY MEANS OF VARIATIONS OF SOUND FREQUENCY AND THE LENGTH OF AIR COLUMN IN A SMALL PIPE - (A RESONANT METHOD USING SPEAKER AND ELECTRIC FEEDBACK LOOP) Reviewed

    S SAKAMOTO, R ICHIMIYA, Y SUZUKI

    JSME INTERNATIONAL JOURNAL SERIES III-VIBRATION CONTROL ENGINEERING ENGINEERING FOR INDUSTRY   35 ( 1 )   9 - 13   1992.3

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    A new method of measuring displacement by means of variations of sound frequency and length of an air column in a stopped resonant pipe has been investigated. In this study, a speaker was used as the sound-generating source instead of the air jet, which was used for the feedback excitation mechanism on the edge instrument. This paper deals with a new kind of displacement sensor using an electric feedback circuit. A sweep signal is radiated from the speaker through the small hole which is opened on one end of the closed resonant pipe, toward the inside of the air column. The sound pressure takes the largest value at the resonant frequency. The displacement of the plunger which is inserted from the other end of the pipe corresponds to the length of the air column. Thus, the displacement of the plunger corresponds well to the resonant frequency of the air column. The phase-locked loop device is adopted for stability of the resonance and frequency.

    DOI: 10.1299/jsmec1988.35.9

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  • New Displacement Measuring Method Using Variations in Sound Frequency of Air Columu in a Small Pipe. Electric Acoustic Noncontact Displacement Sensor.

    SAKAMOTO Shuichi, ICHIMIYA Ryoichi

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C   58 ( 555 )   3259 - 3264   1992

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    A new displacement measuring method using variations in sound frequency and length of an air column in a closed resonant pipe has been investigated. This noncontact displacement sensor is oscillated by the feedback loop, which is composed of a speaker, microphone and phase-locked loop. The sound pressure takes the largest value at the resonant frequency. The displacement of the measuring object corresponds to the impedance of one end of the air column. Thus the displacement of the measuring object has good correspondence to the resonant frequency of the acoustic system. The original resonant point is measured by transfer function from the FFT analyzer. An electrical analogy is adopted for theoretical analysis of the acoustic system. The results of the calculation and experiments coincide significantly.

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  • A New Method of Measuring Length of Pipe by Means of Sound Signals : Detecting Resonant Frequency of Air Column in Pipe Reviewed

    Ryoichi ICHIMIYA, Shuichi SAKAMOTO

    Transactions of the Japan society of Mechanical Engineers, Series C   57 ( 539 )   2217 - 2222   1991.7

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    Language:Japanese   Publisher:the Japan society of Mechanical Engineers  

    This research paper presents a new method of measuring the length of a pipe by using sound frequency. A sweep signal is radiated from the speaker toward the inside of the pipe. The sound pressure at the resonant frequency of the air column in the pipe indicates the largest value. The length of the pipe to be measured corresponds well to the resonant frequency. The phase. locked loop device is adopted to obtain the stabilities of resonation and frequency. A frequency counter with a reciprocal mode is adopted for higher resolution within a shorter time period because of low frequency.

    DOI: 10.1299/kikaic.57.2217

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    Other Link: http://hdl.handle.net/10191/5793

  • A New Measuring Method of Displacement by Means of Variations of Sound Frequency and the Length of Air Column in a Small Pipe : Theoretical Analysis of the Resonant Method by Using Speaker Reviewed

    Shuichi SAKAMOTO, Ryoichi ICHIMIYA

    Transactions of the Japan society of Mechanical Engineers, Series C   57 ( 535 )   780 - 786   1991.3

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    Language:Japanese   Publisher:the Japan society of Mechanical Engineers  

    A new measuring method of displacement by means of variations of sound frequency and length of an air column in a closed resonant pipe has been investigated. This displacement sensor is oscillated by the feedback loop which is composed of a speaker, microphone and phase-locked loop instead of an air jet for the feedback excitation mechanism on the edge instrument. The sound pressure takes the largest value at the resonant frequency. The displacement of the plunger corresponds to the length of the air column. Thus the displacement of the plunger has good correspondence to the resonant frequency of the air column. However the oscillating frequency shifts from the original resonant frequency at the end of the range due to the use of the filter and simple circuit. Thus, the original resonant point is measured by transfer function from the FFT analyzer. An electrical analogy is adopted for theoretical analysis of the acoustic system. The results of the calculations and experiments coincide significantly.

    DOI: 10.1299/kikaic.57.780

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    Other Link: http://hdl.handle.net/10191/5791

  • A New Method of Measuring Displacement by Means of Variation of Sound Frequency and the Length of Air Column in a Small Pipe. (A Resonant Method using Speaker and Electric Feedback Loop) Reviewed

    Shuichi SAKAMOTO, Ryoichi ICHIMIYA

    Transactions of the Japan society of Mechanical Engineers, Series C   56 ( 530 )   2562 - 2566   1990.10

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    A new measuring method of displacement by means of variations of sound frequency and length of air column in a closed resonant pipe has been investigated. In this paper, a speaker is used as a sound generating source in stead of air jet for the feedback excitation mechanism on the edge instrument. This paper deals with a new kind of displacement sensor using a electric feedback circuit. A sweep signal is radiated from the speaker through the small hole at one end of the closed resonant pipe toward inside of the air column. The sound pressure takes the largest value at the resonant frequency. The displacement of the plunger which is inserted from other end of the pipe, corresponds to the length of the air column. So, the displacement of the plunger makes good correspondence to the resonant frequency of the air column. The phase locked loop devise is adopted for stability of the resonation and frequency.

    DOI: 10.1299/kikaic.56.2562

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    Other Link: http://hdl.handle.net/10191/5789

  • A New Measuring Method of Displacement by Means of Variations of Sound Frequency and the Length of Air Column in a Small Pipe : Theoretical Analysis by Means of Electrical Analogous Circuit and Velocity Distribution Reviewed

    Shuichi SAKAMOTO, Ryoichi ICHIMIYA

    Transactions of the Japan society of Mechanical Engineers, Series C   56 ( 522 )   435 - 441   1990.2

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    A new measuring method of displacement by means of variations of sound frequency and length of the air column in a closed resonant pipe has been investigated. This paper deals with the theoretical analysis of this device as a small and closed edge instrument (for example, a dog training whistle or a closed organ pipe). The electrical analogous circuit of a closed edge instrument was introduced for theoretical analysis. In the calculation, the velocity distribution of blown air on the mouth of the instrument was adopted. The results of the calculation of theoretical equations and experiments coincide significantly.

    DOI: 10.1299/kikaic.56.435

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    Other Link: http://hdl.handle.net/10191/5781

  • A NEW MEASURING METHOD OF DISPLACEMENT AND POSITION BY MEANS OF VARIATION OF SOUND FREQUENCY OF AIR COLUMN IN A SMALL PIPE - RELATIONSHIP BETWEEN ACTIVE END CORRECTION AND TRANSIT ANGLE Reviewed

    R ICHIMIYA, S SAKAMOTO

    JSME INTERNATIONAL JOURNAL SERIES III-VIBRATION CONTROL ENGINEERING ENGINEERING FOR INDUSTRY   31 ( 4 )   727 - 731   1988.12

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:JAPAN SOC MECHANICAL ENGINEERS SANSHIN HOKUSEI BLDG  

    DOI: 10.1299/jsmec1988.31.727

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  • A New Measuring Method of Displacement and Position by Means of Variation of Sound Frequency of Air Column in a Small Pipe. (Relation Between Active End Correction and Transit Angle) Reviewed

    Ryoichi ICHIMIYA, Shuichi SAKAMOTO

    Transactions of the Japan society of Mechanical Engineers, Series C   54 ( 499 )   651 - 655   1988.3

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    This paper deals with the development and analysis of a new measuring method of displacement and position by means of the variations of the sound frequency and the air column in a resonant pipe. Sound generates when compressed air is blown onto an open-ended face of a small pipe. The sound frequency varies with the length of the air column in the resonant pipe. By applying this phenomena, a new, accurate and simple measuring method for the displacement and position is examined and developed. The displacement corresponds to the length of the air column and the variation of the sound frequency shows a good relationship with the displacement. The resonant frequency of the pipe can be shown by a simple equation; however, the resonant frequency does not coincide with the sounding frequency of the pipe. The difference of these two frequencies could be introduced in this paper as an active end correction of the pipe.

    DOI: 10.1299/kikaic.54.651

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    Other Link: http://hdl.handle.net/10191/5775

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Books

  • 自動車室内の静粛性向上と、防音・防振技術、材料の開発

    技術情報協会( Role: Contributor ,  2.4節「軽量な粉体の特異な縦振動を利用した低周波数向けの薄い吸音材料」pp. 54-63)

    技術情報協会  2021.9  ( ISBN:9784861048586

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    Total pages:646p   Language:Japanese

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  • 吸音・遮音材料の開発、評価と騒音低減技術

    坂本 慎一, 山本 崇史, 坂本 秀一( Role: Contributor ,  3.4節「バイオマスを利用した吸音材料に関する研究」)

    技術情報協会  2018.7  ( ISBN:9784861047190

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    Total pages:721   Responsible for pages:95-107   Language:Japanese Book type:Scholarly book

    本書は、粉体プロセスを構築するための、できるだけ具体的な内容を盛り込み、可能な限り装置、設備の実際の選定、設計に役立つように、実例を含めて解説、トラブルの対策を示している。また粉体を取り扱う上での多くの技術について説明し、トラブルを解説している。担当部分では、粉体層の音響特性とその利用について述べた。具体的には、粉体層における吸音の原理、粉体層の吸音率の測定方法、粉体層の吸音率の測定結果の例、粒子形状が不変で密度が変化した場合の吸音特性、異なる粒径同士を積層した場合の吸音特性、バインダーによる結合した場合の吸音特性、圧縮性の粒子が押しつぶされた場合の吸音特性、異形の粉体の吸音率、音響を利用した粉体の粒状の非接触判別、音響を利用した粉体の容器内レベル測定、について著者の研究成果も紹介して述べた。

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  • Process Design and Trouble Shooting in Powder & Nanoparticle Processing

    ( Role: Joint author)

    Technosystem Co.,Ltd  2014.11  ( ISBN:9784924728721

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    Language:Japanese Book type:Scholarly book

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  • Handbook of Mechanical Engineering

    Karl-Heinrich Grote, Erik K. Antonsson, Shuichi Sakamoto( Role: Joint author ,  787-818)

    Springer  2009.2 

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    Language:English Book type:Scholarly book

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  • Research of measurement of displacement and length by means of resonant frequency of air column in a pipe

    Shuichi SAKAMOTO

    1991.2 

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MISC

Presentations

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Industrial property rights

  • 音響式液面検出装置

    島崎義之, 田中誠三, 一宮亮一, 坂本秀一

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    Application no:特願平7-187973  Date applied:1995.6

    Announcement no:特開平9-15020  Date announced:1997.1

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Awards

  • JSME Manufacturing and Machine Tool Award for Outstanding Presentation

    1997.3  

    Shuhei AIDA, Ryoichi ICHIMIYA, Masanao YAMADA, Shuichi SAKAMOTO, Shigeo MATSUMURA

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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  • 日本機械学会 研究奨励賞

    1996.4   日本機械学会  

    坂本秀一

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

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Research Projects

  • On the effective flow-induced noise reduction technique by controlling the acoustic transmission loss at the fluid-solid interface

    Grant number:23K03747

    2023.4 - 2026.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

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    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

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  • Elucidation of innovative sound absorption mechanism with lightweight and fine powder

    Grant number:20K04359

    2020.4 - 2023.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

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    Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

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  • Development of non destructive techinique using opto-acoustic method

    Grant number:18H01722

    2018.4 - 2022.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    Sasaki Tomohiro

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    Grant amount:\17160000 ( Direct Cost: \13200000 、 Indirect Cost:\3960000 )

    Against the background of "Maltimatrialization", development of a non-destructive techinique for disimiller bonded materials including metals, plastics are performed. The analysis focuses on residual stress in the vicinity of the bonded interface. An optical interferrometer is deviced to visuliaze the deforamtion behavior of material in two dimension and full field. The device is capable of visuallizing dynamic deformation when the materials are subjected to a minimul and reversible deformation. This project demonstrates the feasibility of a new technique of reisdual stress estimation.

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  • Experimental and Theoretical Study on Sound-Absorbing Materials Made from Biomass

    Grant number:16K06151

    2016.4 - 2019.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    Sakamoto Shuichi

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\4940000 ( Direct Cost: \3800000 、 Indirect Cost:\1140000 )

    This study elucidates the sound-absorbing characteristics of biomass, such as rice straw and wastepaper.
    Experimental equipment was constructed and used to measure the phenomenon in which the waveguide effect appearance in the tubular plants caused an increase in the apparent thickness of the sound-absorbing material. Moreover, the theoretical investigation of the oblique incidence sound absorption coefficient was conducted.
    Experiments and theoretical analysis were performed on the sound-absorbing characteristics of bundled rice straw, thereby integrally accounting for the clearance between the straw and cylindrical and the concentric clearance. Further, experiments and a theoretical analysis were performed on the cross- sections of the structures made from bundled wastepaper. These cross-sections resembled layered corrugated board. The experimental and calculated values were in good agreement, resulting in the verification of the calculation models.

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  • Development of an education program for promoting higher-level engineers by considering their diverse study history

    Grant number:26301042

    2014.4 - 2019.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    Sato Takashi

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    Grant amount:\13520000 ( Direct Cost: \10400000 、 Indirect Cost:\3120000 )

    The development of an education program promoting higher-level engineers, that takes their diverse study histories into consideration is our main goal. Education systems in Japan, such as Technical High Schools, Technical Colleges, Technical Junior Colleges, Universities, and Graduate Schools. While it is true that the numbers of both female-, as well as foreign- students in Engineering fields are increasing, they are not yet at desired levels. Diversity in Engineering Education is necessary both in Japan and in the view point of Japanese contribution to international society, which is now globalized in many fields. The globalization of the Japanese Engineering Education System is vitally important for exporting both industrial products and Japanese Engineering Education systems.
    We are extremely proud of our success, having grown students who have both the ability to explore the subject and make meaningful contributions in globalized society in our program.

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  • Study of sound absorbing materials using biomass

    Grant number:24560253

    2012.4 - 2015.3

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    SAKAMOTO Shuichi

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    Grant type:Competitive

    Grant amount:\5200000 ( Direct Cost: \4000000 、 Indirect Cost:\1200000 )

    In this study, the sound-absorption coefficients of the sound-absorbing structure using bundle of narrow clearances between a number of thin plates were measured for various formations and size. We discussed the experimental results and conducted a theoretical analysis on several different sound-absorbing structures that take into account the viscosity of the boundary layer at the clearances.
    We developed a theoretical estimation method with respect to various cross sectional narrow hole bundle structures by using just their dimensions, and verified its effectiveness by comparing the results with those of experiments.
    We placed these biomass resources at an incline with respect to the sound wave incident direction and obtained the following results. Arranging bundles of rice straw elements at an incline allows us to reduce the apparent thickness of sound-absorbing materials without impacting sound-absorption characteristics in the low-frequency range.

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  • TEシャント弁内蔵型人工喉頭の実用化開発

    2011.12 - 2012.7

    System name:受託研究(一般受託研究)

    Awarding organization:独立行政法人科学技術振興機構(JST)

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    Grant type:Competitive

    Grant amount:\1700000

    研究成果展開事業(研究成果最適展開支援プログラム(A-STEP))(フィージビリティスタディ(探索タイプ))

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  • 室内ドアの消音構造に関する研究

    2011.10 - 2012.9

    System name:共同研究(国内共同研究)

    Awarding organization:株式会社LIXIL

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    Grant type:Competitive

    Grant amount:\1000000

    民間企業との共同研究につき、詳細は割愛。

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  • 昆虫類の飛翔音の測定と解析

    2010.9 - 2011.6

    System name:共同研究(国内共同研究)

    Awarding organization:株式会社新潟TLO

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    Grant type:Competitive

    Grant amount:\500000

    人間に対して被害を及ぼす可能性がある昆虫類(アブ、ハチ等)の飛翔音を測定・解析する。その飛翔音の解析から特徴を把握し、被害の防止に役立てる。

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  • 医療用炭酸ガスレーザに用いる中空光ファイバーにおけるリーク検出に音響を利用する方法(研究成果実用化検討(FS)課題)

    2006.7 - 2007.1

    System name:受託研究

    Awarding organization:独立行政法人科学技術振興機構 JSTサテライト新潟

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    Grant type:Competitive

    Grant amount:\885500

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  • ブンゼン気化式バーナーの「シュー」音低減

    2004.7 - 2005.3

    System name:共同研究(国内共同研究)

    Awarding organization:ダイニチ工業株式会社

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    Grant type:Competitive

    Grant amount:\700000

    企業との共同研究につき割愛

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  • Study for Contactless Detection of Number of Thin Sheet Material by Sound

    Grant number:16560205

    2004.4 - 2005

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    SAKAMOTO Shuichi

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    Grant type:Competitive

    Grant amount:\3400000 ( Direct Cost: \3400000 )

    This report deals with the development of a new method for detecting the number of thin sheets of porous material without making contact. It is necessary to detect one or more of sheets to avoid mishandling. This detecting sensor utilizes the variation of the phase or magnitude of the transfer function within an entire acoustic system. The incident impedance of the porous material varies with the number of sheets. Characteristic acoustic impedance and complex wave number define the particular characteristics of the material. In this application it is useful to know characteristic impedance of the porous material. The measured impedance of sheets by the transfer function method was included in the theoretical analysis and FEM analysis. The results of the experiments, theoretical analysis and FEM show good coincidence.
    In the next part, the normal incidence absorption coefficient for porous multilayer between different grain diameters with arbitrary layer thicknesses can be calculated. This calculation process is comparatively lengthy, so the experiments for real multilayer and the calculations were compared. Result of the calculations agreed to the experiments. Consequently, calculation result of normal incidence absorption coefficient for multilayer between different grain diameters is useful.
    Moisture is an important affector for acoustic characteristics of the porous materials. So we investigated also about relationship between percentage of moisture content and absorption coefficient of granular (as porous) material.
    In the last research period we developed a system including an impedance tube with 4 microphones to measure transmission loss of porous thin film.

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  • 音響を利用した各種シート材料の複数枚誤送検出に関する研究

    Grant number:11750096

    1999.4 - 2000

    System name:科学研究費助成事業

    Research category:奨励研究(A)

    Awarding organization:日本学術振興会

    坂本 秀一

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    Grant type:Competitive

    Grant amount:\2500000 ( Direct Cost: \2500000 )

    音響を利用して薄膜材料の枚数を非接触で検出する方法に関する研究。樹脂などの固体材料の他、布などの多孔性の膜についても検出を可能とした。また、移動中の非接触検出も可能とした。

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  • 音響を利用したシート材の複数枚誤送検出に関する研究

    Grant number:09750136

    1997.4 - 1998

    System name:科学研究費助成事業

    Research category:奨励研究(A)

    Awarding organization:日本学術振興会

    坂本 秀一

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    Grant type:Competitive

    Grant amount:\2200000 ( Direct Cost: \2200000 )

    音響を利用して薄膜材料の枚数を非接触で検出する方法に関する研究。樹脂などの固体材料の他、布などの多孔性の膜についても検出を可能とした。また、移動中の非接触検出も可能とした。

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  • 音響を利用したシート材の複数枚誤送検出センサに関する研究

    Grant number:08750137

    1996.4 - 1996

    System name:科学研究費助成事業

    Research category:奨励研究(A)

    Awarding organization:日本学術振興会

    坂本 秀一

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    Grant type:Competitive

    Grant amount:\1100000 ( Direct Cost: \1100000 )

    音響を利用して薄膜材料の枚数を非接触で検出する方法に関する研究。

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  • 音響を利用したシート複数枚誤送検出センサに関する研究

    Grant number:07750133

    1995.4 - 1995

    System name:科学研究費助成事業

    Research category:奨励研究(A)

    Awarding organization:日本学術振興会

    坂本 秀一

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    Grant type:Competitive

    Grant amount:\1000000 ( Direct Cost: \1000000 )

    音響を利用して薄膜材料の枚数を非接触で検出する方法に関する研究。

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  • Development of New Measuring Method of thin film thickness using Sound Frequency

    Grant number:07555039

    1995 - 1996

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (B)

    Awarding organization:Japan Society for the Promotion of Science

    ICHIMIYA Ryoichi, SAKAMOTO Shuichi

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    Grant amount:\5400000 ( Direct Cost: \5400000 )

    When the sound wave is radiated upon a thin film mounted on a rigid box containing a air-layr, the thin film and air-layr resonate under a certain frequency. The resonant frequency depends upon the thickness of the film. The resonant frequency varies almost linearly with the thickness of the film. The experiments were conducted under various conditions in order to find important factors affecting on the frequency. The experiments for the plate to measure its thickness were also conducted. Following conclusions were introduced.
    ** The position of the sound source upon the film does not give an affect on the resonant frequency.
    ** From the experiments not only for the polyethylene, vinyl chloride, acryle and nylon, it was clear that the thickness of the thin film can be measured from the resonant frequency.
    ** Similar resonant frequencies were obtained in both experiments, one is to use wide range white noise and another one is to sweep the pure tone.
    ** This measuring method is not applicable for the hard materials such as a hard plate because the hard plate does not resonate by the sound wave from a speaker.

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  • A New Measuring Method of Cylinder Diameter using Sound Phase Delay

    Grant number:07650136

    1995 - 1996

    System name:Grants-in-Aid for Scientific Research

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    ICHIMIYA Ryoichi, SAKAMOTO Shuichi

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    Grant amount:\2400000 ( Direct Cost: \2400000 )

    A new measuring method of the diameter of a cylinder by means of sound signals, particularly by means of changes in phase of sound waves, is studied. This new method is based on the phenomenon that the phases of sound waves scattered by an obstacle are delayd according to the character of the obstacle. Phase delay of sound pressure behind a cylinder, which plane sound waves impinged on, was related to the cylinder diameter up to the 100 mm.
    Experiments have been made using a loudspeaker, microphone and a FFT-analyzer. The problem of the disturbance of plane waves by a cylinder has been analyzed theoretically and the relationship between the phase delay and the diameter was obtained. The diameter was determined with precision of(]SY.+-。[)0.04 mm from the relationship that the phase delay was linearly proportional to the diameter over a wide diameter range. For the purpose of improving the precision, a pair of rigid walls, which the cylinder of interest was placed midway between, were located parallel to the incident sound waves.
    It was found that the increase rate of the phase delay with diameter became larger within a certain diameter range which was dependent on the frequency of sound and that the precision was improved up to (]SY.+-。[) 0.01 mm.

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  • 管内空気柱の音響周波数変化を利用した変位の精密測定

    Grant number:01790363

    1989 - 1990

    System name:科学研究費助成事業

    Research category:奨励研究(特別研究員)

    Awarding organization:日本学術振興会

    坂本 秀一

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    Grant amount:\1900000 ( Direct Cost: \1900000 )

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Teaching Experience (researchmap)

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Teaching Experience

  • 加工学

    2022
    Institution name:新潟大学

  • 創造研究プロジェクトI

    2022
    Institution name:新潟大学

  • 創造プロジェクトI

    2022
    Institution name:新潟大学

  • 創造プロジェクトII

    2022
    Institution name:新潟大学

  • 創造研究プロジェクトII

    2022
    Institution name:新潟大学

  • 創造プロジェクト基礎

    2022
    Institution name:新潟大学

  • 異文化と技術

    2021
    Institution name:新潟大学

  • 応用音響学

    2021
    Institution name:新潟大学

  • 安全工学基礎

    2021
    -
    2022
    Institution name:新潟大学

  • 卒業研究

    2020
    Institution name:新潟大学

  • 先端研究入門

    2020
    Institution name:新潟大学

  • 機械工学実験IV

    2020
    Institution name:新潟大学

  • 英文輪読II

    2020
    Institution name:新潟大学

  • 機械工学実験III

    2020
    Institution name:新潟大学

  • 英文輪読I

    2019
    Institution name:新潟大学

  • 卒業研修

    2019
    Institution name:新潟大学

  • 機械工作実習III

    2018
    Institution name:新潟大学

  • 加工学I

    2018
    -
    2021
    Institution name:新潟大学

  • 工学リテラシー入門(力学分野)

    2017
    Institution name:新潟大学

  • 物理工学実験

    2017
    Institution name:新潟大学

  • 機械工学概論

    2017
    Institution name:新潟大学

  • 機械工学実験I

    2016
    Institution name:新潟大学

  • 機械工学演習

    2016
    Institution name:新潟大学

  • 機械工学実験II

    2016
    Institution name:新潟大学

  • 切削加工

    2015
    -
    2017
    Institution name:新潟大学

  • 機械科学総論

    2014
    Institution name:新潟大学

  • 企業における生産・開発

    2014
    Institution name:新潟大学

  • 機械科学セミナーⅠ

    2012
    -
    2015
    Institution name:新潟大学

  • 機械科学文献詳読Ⅰ

    2012
    -
    2015
    Institution name:新潟大学

  • 材料生産システム特定研究Ⅱ

    2012
    -
    2015
    Institution name:新潟大学

  • 研究発表演習・発表

    2012
    -
    2015
    Institution name:新潟大学

  • 機械科学文献詳読Ⅱ

    2012
    -
    2015
    Institution name:新潟大学

  • 機械科学特別演習

    2012
    -
    2015
    Institution name:新潟大学

  • 材料生産システム特定研究Ⅰ

    2012
    -
    2015
    Institution name:新潟大学

  • 機械科学セミナーⅡ

    2012
    -
    2015
    Institution name:新潟大学

  • くらしを支える機械システム工学

    2010
    Institution name:新潟大学

  • 機械工作実習I

    2009
    Institution name:新潟大学

  • 機械工作実習II

    2009
    Institution name:新潟大学

  • 工学リテラシー入門(機械システム工学科)

    2009
    -
    2016
    Institution name:新潟大学

  • スタディスキルズ(機械工学基礎)

    2008
    Institution name:新潟大学

  • 機械音響工学論

    2007
    Institution name:新潟大学

  • 機械音響工学

    2007
    Institution name:新潟大学

  • 機械設計I

    2007
    Institution name:新潟大学

  • 応用音響学

    2007
    -
    2019
    Institution name:新潟大学

  • 異文化と技術

    2007
    -
    2018
    Institution name:新潟大学

  • リメディアル演習(機械数理)

    2007
    -
    2015
    Institution name:新潟大学

  • 創造工学実習

    2007
    -
    2015
    Institution name:新潟大学

  • 応用数理A

    2007
    -
    2009
    Institution name:新潟大学

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