2024/03/01 更新

写真a

サカモト シユウイチ
坂本 秀一
SAKAMOTO Shuichi
所属
教育研究院 自然科学系 生産デザイン工学系列 准教授
自然科学研究科 材料生産システム専攻 准教授
工学部 工学科 准教授
職名
准教授
▶ researchmapのプロフィールを表示
外部リンク

学位

  • 学術博士 ( 1991年3月   新潟大学 )

研究分野

  • ものづくり技術(機械・電気電子・化学工学) / 設計工学  / 故障診断

  • ものづくり技術(機械・電気電子・化学工学) / 加工学、生産工学  / センサ

  • 情報通信 / 機械力学、メカトロニクス  / 音響工学

  • ものづくり技術(機械・電気電子・化学工学) / 機械要素、トライボロジー  / 故障診断

経歴(researchmap)

  • 新潟大学   工学部 工学科   准教授

    2017年4月 - 現在

      詳細を見る

  • 新潟大学   工学部 機械システム工学科   准教授

    1998年4月 - 2017年3月

      詳細を見る

  • 新潟大学   工学部   助手

    1992年11月 - 1998年3月

      詳細を見る

  • 新潟大学   自然科学研究科   助手

    1991年4月 - 1992年10月

      詳細を見る

経歴

  • 新潟大学   工学部 工学科   准教授

    2017年4月 - 現在

  • 新潟大学   自然科学研究科 材料生産システム専攻   准教授

    2007年4月 - 現在

  • 新潟大学   機械システム工学科   准教授

    2007年4月 - 2017年3月

  • 新潟大学   助教授

    1998年4月 - 2007年3月

  • 新潟大学   工学部   助手

    1992年11月 - 1998年3月

  • 新潟大学   自然科学研究科   助手

    1991年4月 - 1992年10月

▶ 全件表示

所属学協会

委員歴

  • 新潟県   公害審査会 委員  

    2018年11月 - 現在   

      詳細を見る

    団体区分:自治体

    researchmap

  • 新潟県   環境審議会 委員  

    2017年6月 - 現在   

      詳細を見る

    団体区分:自治体

    researchmap

  • 新潟県   大規模小売店舗立地審議会 委員  

    2015年5月 - 現在   

      詳細を見る

    団体区分:自治体

    researchmap

  • 日本機械学会   校閲委員  

    2009年4月 - 2011年3月   

      詳細を見る

    団体区分:学協会

    researchmap

  • 日本機械学会 北陸信越支部   商議員  

    2009年3月 - 2011年3月   

      詳細を見る

    団体区分:学協会

    researchmap

  • 日本機械学会   北陸信越支部 学生会幹事  

    2009年3月 - 2010年3月   

      詳細を見る

    団体区分:学協会

    researchmap

▶ 全件表示

取得資格

  • 公害防止管理者

 

論文

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

    Shuichi Sakamoto, Tsukasa Hasegawa, Koki Ikeda

    Nanomaterials   2023年11月

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

    DOI: 10.3390/nano13222947

    researchmap

  • Theoretical and Experimental Analyses on the Sound Absorption Coefficient of Rice and Buckwheat Husks Based on Micro-CT Scan Data. 査読 国際誌

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

    Materials (Basel, Switzerland)   16 ( 16 )   2023年8月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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

    PubMed

    researchmap

  • Mathematical Model for Estimating the Sound Absorption Coefficient in Grid Network Structures. 査読 国際誌

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

    Materials (Basel, Switzerland)   16 ( 3 )   2023年1月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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

    PubMed

    researchmap

  • 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. 査読 国際誌

    Shuichi Sakamoto, Kyosuke Suzuki, Kentaro Toda, Shotaro Seino

    Materials (Basel, Switzerland)   16 ( 1 )   2022年12月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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

    PubMed

    researchmap

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

    Shuichi Sakamoto, Kyosuke Suzuki, Kentaro Toda, Shotaro Seino

    Materials (Basel, Switzerland)   15 ( 20 )   2022年10月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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

    PubMed

    researchmap

  • Simplified Limp Frame Model for Application to Nanofiber Nonwovens (Selection of Dominant Biot Parameters). 査読 国際誌

    Shuichi Sakamoto, Tetsushi Shintani, Tsukasa Hasegawa

    Nanomaterials (Basel, Switzerland)   12 ( 17 )   2022年9月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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

    PubMed

    researchmap

  • Addition of Two Substantial Side-Branch Silencers to the Interference Silencer by Incorporating a Zero-Mass Metamaterial. 査読 国際誌

    Shuichi Sakamoto, Juung Shin, Shota Abe, Kentaro Toda

    Materials (Basel, Switzerland)   15 ( 15 )   2022年7月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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

    PubMed

    researchmap

  • Effect of Sheet Vibration on the Theoretical Analysis and Experimentation of Nonwoven Fabric Sheet with Back Air Space. 査読 国際誌

    Shuichi Sakamoto, Ryo Iizuka, Takumi Nozawa

    Materials (Basel, Switzerland)   15 ( 11 )   2022年5月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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

    PubMed

    researchmap

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

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

    Noise Control Engineering Journal   70 ( 2 )   128 - 135   2022年3月

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

    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

    Scopus

    researchmap

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

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

    Noise Control Engineering Journal   70 ( 2 )   150 - 160   2022年3月

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

    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

    Scopus

    researchmap

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

    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年3月

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

    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

    Scopus

    researchmap

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

    Shuichi Sakamoto, Kohei Ii, Ibuki Katayama, Kyosuke Suzuki

    Noise Control Engineering Journal   69 ( 5 )   401 - 410   2021年9月

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

    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

    Scopus

    researchmap

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

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

    Noise Control Engineering Journal   69 ( 2 )   102 - 111   2021年3月

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

    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

    Scopus

    researchmap

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

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

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

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

    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

    Scopus

    researchmap

  • Theoretical and experiment analysis on the sound absorption characteristics of a layer of fine lightweight powder. 査読 国際誌

    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年10月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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

    PubMed

    researchmap

  • Experiment and estimation of the sound absorption coefficient for clearance of corrugated honeycomb. 査読 国際誌

    Shuichi Sakamoto, Yuki Maruyama, Kohei Yamaguchi, Kohei Ii

    The Journal of the Acoustical Society of America   145 ( 2 )   724 - 724   2019年2月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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

    Web of Science

    PubMed

    researchmap

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

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

    JAPANESE JOURNAL OF APPLIED PHYSICS   58 ( 1 )   2019年1月

  • A silencer incorporated within the thickness of the edge of the door for increasing sound transmission loss. 査読 国際誌

    Shuichi Sakamoto, Shota Koseki, Mizuki Chinda, Shota Abe

    The Journal of the Acoustical Society of America   144 ( 6 )   3303 - 3303   2018年12月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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

    Web of Science

    PubMed

    researchmap

  • Estimation and experiment for sound absorption coefficient of three clearance types using a bundle of nested tubes. 査読 国際誌

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

    The Journal of the Acoustical Society of America   144 ( 4 )   2281 - 2281   2018年10月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元: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

    Web of Science

    PubMed

    researchmap

    その他リンク: 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. 査読 国際誌

    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年9月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元: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

    Web of Science

    PubMed

    researchmap

  • 通風ドアに用いるアレイ状の枝管消音器に関する研究(直線的に拡大する形状の枝管による減音特性の改善) 査読

    坂本秀一, 石田宗弘, 珍田美月

    日本機械学会論文集   83 ( 850 )   1 - 12   2017年6月

     詳細を見る

    記述言語:日本語   出版者・発行元:日本機械学会  

    <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>

    DOI: 10.1299/transjsme.16-00575

    CiNii Article

    J-GLOBAL

    researchmap

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

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

    OPTICAL ENGINEERING   56 ( 6 )   1 - 6   2017年6月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS  

    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.

    DOI: 10.1117/1.OE.56.6.064101

    Web of Science

    researchmap

  • バイオマスを応用した吸音材料に関する研究(音響粒子速度センサを用いた稲藁の斜め入射吸音率の測定) 査読

    坂本秀一, 鶴巻太盛, 藤澤洸平, 山宮弘毅

    日本機械学会論文集   83 ( 845 )   1 - 14   2017年1月

     詳細を見る

    記述言語:日本語   出版者・発行元:日本機械学会  

    本論文においては,稲藁を束ねた吸音構造を,音波入射方向に対して斜めに配置した吸音材料ならびに,自由場における垂直及び斜め入射吸音率についても併せて報告する.稲藁を垂直方向に配置した試料と,斜め方向に配置した試料のいずれにおいても,自由場での垂直入射吸音率は音響管による結果に近い.稲藁を垂直方向に配置した試料と,斜め方向に配置した試料のいずれにおいても,自由場での斜め入射吸音率の吸音ピークは垂直入射吸音率に比べて高周波数側にシフトし,吸音カーブは高周波数域において平坦になる.これらのことより,稲藁製吸音材料が入射面に細孔を有する吸音材料として機能していると考えられる.

    DOI: 10.1299/transjsme.16-00344

    CiNii Article

    J-GLOBAL

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/transjsme/83/845/83_16-00344/_article/-char/ja/

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

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

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

     詳細を見る

    記述言語:英語   出版者・発行元:公益社団法人 日本工学教育協会  

    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.

    DOI: 10.20549/jseeen.2017.0_31

    CiNii Article

    CiNii Books

    researchmap

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

    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年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    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.

    researchmap

  • Residual Stress Analysis Based on Acoustic and Optical Methods. 査読 国際誌

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

    Materials (Basel, Switzerland)   9 ( 2 )   1 - 24   2016年2月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:MDPI AG  

    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.

    DOI: 10.3390/ma9020112

    Web of Science

    PubMed

    researchmap

    その他リンク: http://www.mdpi.com/1996-1944/9/2/112

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

    Shuichi Sakamoto, Takanari Azami, Isami Nitta, Yosuke Tsukiyama

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

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    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.

    DOI: 10.1299/jamdsm.2016jamdsm0067

    Web of Science

    Scopus

    researchmap

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

    Shuichi Sakamoto, Katsuya Higuchi, Shota Koseki

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

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    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.

    DOI: 10.1299/jamdsm.2015jamdsm0062

    Web of Science

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/jamdsm/9/5/9_2015jamdsm0062/_pdf

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

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

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

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    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.

    DOI: 10.1299/jamdsm.2015jamdsm0065

    Web of Science

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/jamdsm/9/5/9_2015jamdsm0065/_pdf

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

    Shuichi Sakamoto, Arata Nakano, Hirohiko Tanikawa, Yuki Maruyama

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

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    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.

    DOI: 10.1299/jamdsm.2015jamdsm0040

    Web of Science

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/jamdsm/9/3/9_2015jamdsm0040/_pdf

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

    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年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:SPRINGER-VERLAG BERLIN  

    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.

    DOI: 10.1007/978-3-319-06986-9_16

    Web of Science

    researchmap

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

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

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

     詳細を見る

    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:SPRINGER-VERLAG BERLIN  

    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.

    DOI: 10.1007/978-3-319-06986-9_16

    Web of Science

    researchmap

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

    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年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    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.

    DOI: 10.1299/jamdsm.2015jamdsm0028

    Web of Science

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/jamdsm/9/3/9_2015jamdsm0028/_pdf

  • 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) 査読

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

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

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    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.

    DOI: 10.1299/jamdsm.2015jamdsm0039

    Web of Science

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/jamdsm/9/3/9_2015jamdsm0039/_pdf

  • 広視野レーザ顕微鏡による銅ガスケットの密封特性の評価 査読

    新田 勇, 松崎良男, 月山陽介, 堀田素志, 坂本秀一

    日本機械学会論文集   80 ( 814 )   1 - 7   2014年6月

     詳細を見る

    記述言語:日本語   出版者・発行元:日本機械学会  

    旋削フランジと金属ガスケット間の密封特性を評価する際には,接触表間の平均すきまを基に漏れ量を見積もることが一般的であった.しかし,複雑な漏れ経路を平均すきまへと単純化するので,定性的に漏れ量を予測できても,定量的な予測は困難であった.本研究では,広視野レーザ顕微鏡を用いて,接触面全面の接触状況を観察できるようにした.旋削フランジの旋削峰がすべてガスケットに接触する臨界接触圧力以上では,旋削溝に沿って漏れ流れが生じると仮定することで,漏れ量を定量的に予測することができた.さらに,臨界接触圧力以下のところでも,観察画像から漏れ経路を特定できるので,ある程度精度良く漏れ量を予測することができた.

    DOI: 10.1299/transjsme.2014dsm0173

    CiNii Article

    J-GLOBAL

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/transjsme/80/814/80_2014dsm0173/_pdf

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

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

    International Journal of Mechanical Engineering and Applications   2 ( 1 )   18 - 24   2014年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Science Publishing Group  

    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.

    DOI: 10.11648/j.ijmea.20140201.14

    CiNii Article

    researchmap

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

    Shuichi Sakamoto, Katsuya Higuchi, Kazuyuki Saito, Shota Koseki

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

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    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.

    DOI: 10.1299/jamdsm.2014jamdsm0036

    Web of Science

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/jamdsm/8/3/8_2014jamdsm0036/_pdf

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

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

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

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    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.

    DOI: 10.1299/jamdsm.2014jamdsm0022

    Web of Science

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/jamdsm/8/3/8_2014jamdsm0022/_pdf

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

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

    JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME   135 ( 4 )   041103-1 - 041103-7   2013年10月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ASME  

    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.

    DOI: 10.1115/1.4024781

    Web of Science

    researchmap

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

    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年1月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS  

    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]

    DOI: 10.1117/1.OE.52.1.014302

    Web of Science

    researchmap

    その他リンク: http://SPIEDigitalLibrary.org/oe

  • 細穴の集合体の寸法による吸音率と透過損失の推定(理論解析と実験結果の比較) 査読

    坂本秀一, 星野 陽, 須藤浩太, 佐藤 孝

    日本機械学会論文集 C編   79 ( 807 )   4164 - 4176   2013年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本機械学会  

    細穴の集合体は管路中の触媒等,吸音や透過損失を主たる目的としない場合でも,各所に見られる.このような細穴の集合体について幾何学的な寸法のみを用いて,吸音率や透過損失を正確に推定することは重要である.そこで著者等は,理論的な推定法の開発を試み,2マイクと4マイクインピーダンス管によって行われた実験結果と比較する事で,その有効性を検証した.最初に,精密な推定のために,計算には,音波の減衰を考慮した二次元円柱座標系の解析に基づいた,細管内の伝搬定数と特性インピーダンスを適用した.次に,二次元の解析を基にした正確な伝搬定数と特性インピーダンスを,軸方向の一次元の伝達マトリックスへ,変換・導入をした.これにより,消音器の設計などで一般的な,一次元の伝達マトリックスを用いて,簡易なプロセスにより精密な推定が可能になった.

    DOI: 10.1299/kikaic.79.4164

    Scopus

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/kikaic/79/807/79_4164/_pdf

  • アレイ状の細管による消音構造を持つルーバにおける音響透過損失の理論解析と測定

    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年

     詳細を見る

  • アレイ状の細管による消音構造を持つルーバにおける音響透過損失の理論解析と測定 (共著) 査読

    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   79 ( 804 )   2817 - 2829   2013年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    開口率が高い薄板のルーバにおける音響透過損失は一般に小さい.本研究は,消音構造を持ったルーバに関するものである.細管要素を並べた薄板をルーバ羽根とした場合,高い開口率を維持したアレイ消音器を構成出来る.このルーバについて,いくつかの形状を試作し,実験および理論解析を行った.まず,4マイクロホンインピーダンス測定管を用い,透過損失の測定を行った.また,伝達マトリックス法による透過損失の理論値を算出した.薄板に内装された細管要素内の音波の減衰は無視出来ないため,理論解析では二次元問題から導かれた伝搬定数と特性インピーダンスを適用した.透過損失の実験値と理論値を比較し,消音特性の検証を行った.

    DOI: 10.1299/kikaic.79.2817

    Scopus

    researchmap

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

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

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

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    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

    Web of Science

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/jamdsm/7/4/7_677/_pdf

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

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

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

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS  

    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

    Web of Science

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/jamdsm/7/4/7_690/_pdf

  • 透過性の膜で連結した二連のオリフィス型消音器の減音特性(透過損失の測定と理論解析) 査読

    坂本秀一, 宮入徹, 星野 陽, 小浦方 格, 佐藤 孝

    日本機械学会論文集 C編   79 ( 806 )   3474 - 3486   2013年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本機械学会  

    二連のオリフィスの間の膨張部に不織布シートを組み合わせた消音器について、インピーダンス管を用いて消音器の透過損失を測定し、ディップの改善効果を示した。また等価回路網により不織布部分の音響系をモデル化し、透過損失の計算値を求めた。その結果、実験値と計算値の傾向は良く一致し、提案した音響モデルで不織布シート部分をある程度近似できる事を示した。

    DOI: 10.1299/kikaic.79.3474

    Scopus

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/kikaic/79/806/79_3474/_pdf

  • 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) 査読

    Itaru KOURAKATA, Shuichi SAKAMOTO, Youta NAKAO

    Journal of Advanced Mechanical Design Systems and Manufacturing   7 ( 4 )   777 - 790   2013年

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    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 laryngecto

    DOI: 10.1299/jamdsm.7.777

    Web of Science

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/jamdsm/7/4/7_777/_pdf

  • 二面間の狭い隙間の集合体を利用した吸音材料に関する実験的研究 査読

    坂本秀一, 斎藤和幸, 村山信明, 樋口克也

    日本機械学会論文集 C編   79 ( 807 )   4141 - 4152   2013年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本機械学会  

    二面間の隙間を利用した吸音構造について,種々の形状・寸法について吸音率を実験により求めた.その結果,以下のことが明らかとなった.境界層厚さとの兼ね合いにより,70μmまでは,二面間の隙間が小さいほど,吸音率は高く,吸音ピーク周波数は低周波数で得られる.隙間が奥行き方向に連続的に減少する場合,隙間が一定の場合と比較して優れた吸音率が得られ,また,吸音率の周波数特性におけるディップは改善される傾向にある.薄板材料の物量が同一の場合,扇子型吸音構造は,楔形吸音構造と同等の吸音性能を有する.

    DOI: 10.1299/kikaic.79.4141

    Scopus

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/article/kikaic/79/807/79_4141/_pdf

  • International Exchanges for Aspiring Students in Engineering Field 招待 査読

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

    Journal of Engineering Education Research   15 ( 4 )   3 - 7   2012年7月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    researchmap

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

    Shuichi SAKAMOTO, Yosuke SAKUMA, Kensaku YANAGIMOTO, Seiji WATANABE

    Journal of Environment and Engineering   7 ( 1 )   12 - 22   2012年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    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

    CiNii Article

    researchmap

    その他リンク: https://www.jstage.jst.go.jp/browse/jee/7/1/_contents

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

    Kensaku YANAGIMOTO, Seiji WATANABE, Masayuki TAKAHASHI, Shuichi SAKAMOTO

    Journal of Environment and Engineering   7 ( 1 )   1 - 11   2012年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    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

    CiNii Article

    researchmap

  • 呼気により駆動されるTEシャント弁内蔵型人工喉頭(適切な音高と音高制御機能獲得の可能性について) 査読

    小浦方 格, 坂本 秀一, 中尾 陽太

    日本機械学会論文集 C編   78 ( 792 )   3053 - 3063   2012年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:一般社団法人 日本機械学会  

    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&#039;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&#039;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&#039; QOL particularly to female patients.

    DOI: 10.1299/kikaic.78.3053

    Scopus

    CiNii Article

    researchmap

  • 音響を利用した中空光ファイバにおける漏洩検出(実験および理論解析) 査読

    坂本秀一, 長瀬功育, 中川雅哉, 新田 勇, 柳本憲作, 渡部誠二

    日本機械学会論文集 C編   77 ( 777 )   2096 - 2106   2011年5月

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    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

    CiNii Article

    researchmap

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

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

    Journal of Environment and Engineering   6 ( 2 )   352 - 364   2011年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    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

    CiNii Article

    researchmap

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

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

    Journal of Engineering Education Research   13 ( 5 )   49 - 54   2010年10月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    researchmap

  • 柔らかく軽量な粒状材料の吸音特性に関する基礎的研究(発泡スチロールビーズにおける基礎的特性) 査読

    坂本秀一, 佐々木勝, 小浦方格, 柳本憲作, 渡部誠二

    日本機械学会論文集 C編   76 ( 770 )   2545 - 2551   2010年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1299/kikaic.76.2545

    Scopus

    researchmap

  • バイオマスの細管等を応用した吸音材料に関する研究 : 稲藁・籾殻およびそば殻の測定結果 査読

    坂本 秀一, 高内 悠揮, 柳本 憲作, 渡部 誠二

    日本機械学会論文集 C編   75 ( 760 )   3223 - 3229   2009年12月

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:一般社団法人 日本機械学会  

    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

    Scopus

    CiNii Article

    J-GLOBAL

    researchmap

  • 粒状材料の含水率による音響特性変化に関する研究(機械力学,計測,自動制御) 査読

    坂本 秀一, 堤 雄二, 柳本 憲作, 渡部 誠二

    日本機械学会論文集 C編   75 ( 757 )   2515 - 2520   2009年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:一般社団法人 日本機械学会  

    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 1mm. 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&#039;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

    Scopus

    CiNii Article

    J-GLOBAL

    researchmap

  • 面ブレにともなう小型軸流ファンの音質変化 査読

    柳本 憲作, 渡部 誠二, 高橋 政行, 坂本 秀一

    日本機械学会論文集 C編   75 ( 752 )   1194 - 1200   2009年

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:一般社団法人 日本機械学会  

    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 10dB by using this adaptive feedback algorithm.

    DOI: 10.1299/kikaic.75.1194

    Scopus

    CiNii Article

    J-GLOBAL

    researchmap

  • 粒状材料の音響特性に関する基礎的研究(粒径の異なる層が重なる場合の垂直入射吸音率) 査読

    坂本 秀一, 佐久間 陽介, 柳本 憲作, 渡部 誠二

    日本機械学会論文集 C編   74 ( 745 )   2240 - 2245   2008年9月

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    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

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

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

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

    Journal of Environment and Engineering   2 ( 3 )   470 - 479   2007年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:The Japan Society of Mechanical Engineers  

    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.

    DOI: 10.1299/jee.2.470

    CiNii Article

    researchmap

    その他リンク: http://orcid.org/0000-0002-5745-1668

  • 適応フィードバック能動騒音制御による離散周波数音の抑制 査読

    渡部誠二, 柳本憲作, 谷藤克也, 坂本 秀一, 高橋政行, 一宮 亮一

    日本機械学会論文集 C編   71 ( 701 )   327 - 334   2005年1月

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本機械学会  

    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 : 3 dB~14 dB with circular slit resonator, 2 dB~15 dB 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

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

  • 音響を利用した容器内粉体レベルの測定 : ガラスビーズを用いた基礎的実験と理論解析 査読

    坂本 秀一, 高井 光太郎, 深井 雄史, 柳本 憲作, 渡部 誠二, 一宮 亮一

    日本機械学会論文集. C編   70 ( 691 )   679 - 686   2004年3月

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本機械学会  

    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

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

  • 音響を利用した樹脂袋内粉体の粒径・種類の非接触判別 査読

    坂本秀一, 高畠昌志, 柳本憲作, 渡部誠二, 一宮亮一

    日本機械学会論文集 C編   69 ( 677 )   42 - 48   2003年1月

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本機械学会  

    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

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

  • 円形空気薄膜層を壁面内に有する機械開口部からの音響放射 : 能動型分布音源による消音特性 査読

    渡部 誠二, 柳本 憲作, 谷藤 克也, 坂本 秀一, 伊藤 孝宏, 一宮 亮一

    日本機械学会論文集. C編   68 ( 674 )   3122 - 3129   2002年10月

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本機械学会  

    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

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

  • 音響を利用したシートの枚数検出法 (第5報,布の音響特性を利用した非接触測定) 査読

    坂本 秀一, 一宮 亮一, 石橋 淳一, 佐藤 太紀

    日本機械学会論文集. C編   67 ( 657 )   1276 - 1281   2001年5月

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:日本機械学会  

    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

    Scopus

    CiNii Article

    J-GLOBAL

    researchmap

  • 414 音響を利用したシートの枚数検出法 : 布の音響特性を利用した非接触測定(GS.3 計測I)

    坂本 秀一, 石橋 淳一, 佐藤 太紀, 一宮 亮一

    北陸信越支部総会・講演会 講演論文集   2000.37   147 - 148   2000年

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/jsmehs.2000.37.147

    CiNii Article

    researchmap

  • 音響を利用したシートの枚数検出法(第4報,布の音響特性を導入した音響系の解析) 査読

    坂本秀一, 一宮亮一, 玉橋知之

    日本機械学会論文集 C編   64巻, 619号   986 - 991   1998年3月

     詳細を見る

    記述言語:日本語  

    DOI: 10.1299/kikaic.64.986

    J-GLOBAL

    researchmap

  • 音響信号の位相遅れを利用したひずみ円形状の測定 (第2報, 測定精度の向上に関する検討) 査読

    相田 収平, 一宮 亮一, 山田 正直, 坂本 秀一

    日本機械学会論文集. C編   63 ( 610 )   1989 - 1995   1997年6月

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:一般社団法人日本機械学会  

    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

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

  • 音響信号の位相遅れを利用したひずみ円形状の測定 査読

    相田収平, 一宮亮一, 山田正直, 坂本秀一, 松村成生

    日本機械学会論文集 C編   62 ( 603 )   4250 - 4256   1996年11月

     詳細を見る

    記述言語:日本語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/kikaic.62.4250

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

    その他リンク: http://www.jstage.jst.go.jp/article/kikaic1979/62/603/62_603_4250/_pdf

  • 音響信号を利用した液面レベルと傾斜角度の測定 査読

    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年3月

     詳細を見る

    記述言語:日本語  

    DOI: 10.1299/kikaic.62.949

    J-GLOBAL

    researchmap

  • 音響を利用したシートの枚数検出法(第3報,伝達関数の位相による紙および布の検出) 査読

    坂本秀一, 一宮亮一, 太田雄三, 宮本賢一

    日本機械学会論文集 C編   61 ( 584 )   1516 - 1521   1995年4月

     詳細を見る

    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1299/kikaic.61.1516

    researchmap

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

    Y SUZUKI, R ICHIMIYA, T WATANABE, S SAKAMOTO

    JSME INTERNATIONAL JOURNAL SERIES C-DYNAMICS CONTROL ROBOTICS DESIGN AND MANUFACTURING   38 ( 1 )   42 - 47   1995年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS SANSHIN HOKUSEI BLDG  

    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

    Web of Science

    researchmap

  • 音響を利用したシートの枚数検出法(第2報,シート移動状態での検出) 査読

    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年3月

     詳細を見る

    記述言語:日本語  

    DOI: 10.1299/kikaic.60.994

    J-GLOBAL

    researchmap

  • Sound-Based Detection Method of Number of Sheets 査読

    Shuichi SAKAMOTO, Ryoichi ICHIMIYA, Yuzo OHTA

    Journal of AdvancedAutomation Tech-nology   6 ( 1 )   42 - 49   1994年1月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    researchmap

  • 音響を利用したシートの枚数検出法 査読

    坂本秀一, 一宮亮一, 太田雄三

    日本機械学会論文集 C編   59 ( 559 )   819 - 826   1993年3月

     詳細を見る

    記述言語:日本語   出版者・発行元:日本機械学会  

    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

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

    その他リンク: http://hdl.handle.net/10191/5797

  • 水中における音響信号を利用した変位の精密測定(音響周波数と変位の関係) 査読

    鈴木祐治, 一宮亮一, 渡邊友行, 坂本秀一

    日本機械学会論文集C編   59 ( 558 )   587 - 592   1993年2月

     詳細を見る

    記述言語:日本語   出版者・発行元:日本機械学会  

    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

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

    その他リンク: http://hdl.handle.net/10191/5909

  • 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(電気音響式非接触変位センサ) 査読

    坂本秀一, 一宮亮一

    日本機械学会論文集 C編   58 ( 555 )   3259 - 3264   1992年11月

     詳細を見る

    記述言語:日本語  

    DOI: 10.1299/kikaic.58.3259

    J-GLOBAL

    researchmap

  • 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) 査読

    S SAKAMOTO, R ICHIMIYA, Y SUZUKI

    JSME INTERNATIONAL JOURNAL SERIES III-VIBRATION CONTROL ENGINEERING ENGINEERING FOR INDUSTRY   35 ( 1 )   9 - 13   1992年3月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS SANSHIN HOKUSEI BLDG  

    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

    Web of Science

    researchmap

  • 管内空気柱の音響波数変化を利用した変位の精密測定 電気音響式非接触変位センサ

    坂本 秀一, 一宮 亮一

    日本機械学会論文集C編   58 ( 555 )   3259 - 3264   1992年

     詳細を見る

    記述言語:日本語   出版者・発行元:日本機械学会  

    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.

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

  • 音響信号を利用した管の長さ測定(管内空気柱の共振周波数検出) 査読

    一宮亮一, 坂本秀一

    日本機械学会論文集 C編   57 ( 539 )   2217 - 2222   1991年7月

     詳細を見る

    記述言語:日本語   出版者・発行元:日本機械学会  

    管内空気柱の共鳴周波数は長さに対応する事を利用して管の長さを測定する方法を考案した。被測定管内に音波を放射し、マイクロホンにより拾った信号の周波数成分をフィードバックすることにより共振周波数において強力に発振させ、共振点を検出する。本測定法は、管が地中や液体中などに埋設されている場合や曲がり管の測定も可能である。

    DOI: 10.1299/kikaic.57.2217

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

    その他リンク: http://hdl.handle.net/10191/5793

  • 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(スピーカによる共鳴法における理論解析) 査読

    坂本秀一, 一宮亮一

    日本機械学会論文集 C編   57 ( 535 )   780 - 786   1991年3月

     詳細を見る

    記述言語:日本語   出版者・発行元:日本機械学会  

    両端閉口管内に音波を入れ管内音圧が空気柱長さに対応した共振周波数で最大になる事を利用し、電気的フィードバックループを構成し発振させる変位センサにおいて、電気的等価回路により、音響系の理論解析を行い実験結果と比較した結果、両者はよく一致し、等価回路の妥当性が確認された。

    DOI: 10.1299/kikaic.57.780

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

    その他リンク: http://hdl.handle.net/10191/5791

  • 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(スピーカと電気的フィードバックループによる共鳴法) 査読

    坂本秀一, 一宮亮一

    日本機械学会論文集 C編   56 ( 530 )   2562 - 2566   1990年10月

     詳細を見る

    記述言語:日本語   出版者・発行元:日本機械学会  

    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

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

    その他リンク: http://hdl.handle.net/10191/5789

  • 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(等価回路と流速分布による理論解析) 査読

    坂本秀一, 一宮亮一

    日本機械学会論文集 C編   56 ( 522 )   435 - 441   1990年2月

     詳細を見る

    記述言語:日本語   出版者・発行元:日本機械学会  

    一端閉口管の開口端に圧縮空気を吹き付けて音響を発生させ、空気柱長さと周波数を対応させた変位センサは、犬笛や一端閉口のエアリード楽器と同一のフィードバック発音機構を持つ。この観点から発音機構を解析し、等価回路を導き、音響インピーダンス、四端子網の定数を導入した。解析結果は実験結果とよい一致を見せ、解析の妥当性が確認された。

    DOI: 10.1299/kikaic.56.435

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

    その他リンク: 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 査読

    R ICHIMIYA, S SAKAMOTO

    JSME INTERNATIONAL JOURNAL SERIES III-VIBRATION CONTROL ENGINEERING ENGINEERING FOR INDUSTRY   31 ( 4 )   727 - 731   1988年12月

     詳細を見る

    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:JAPAN SOC MECHANICAL ENGINEERS SANSHIN HOKUSEI BLDG  

    DOI: 10.1299/jsmec1988.31.727

    Web of Science

    researchmap

  • 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(動的端補正と位相進角の関係) 査読

    一宮亮一, 坂本秀一

    日本機械学会論文集 C編   54 ( 499 )   651 - 655   1988年3月

     詳細を見る

    記述言語:日本語   出版者・発行元:日本機械学会  

    一端閉口管の開口端に圧縮空気を吹き付け音響を発生させ、管内空気柱の長さを他端から差し込んだプランジャの変位に対応させることにより、測定物変位を音響周波数に変換する変位センサを開発した。またジェットの存在により起こる周波数のずれの性質を、ジェット位相進角との関係を用いて明らかにした。

    DOI: 10.1299/kikaic.54.651

    CiNii Article

    CiNii Books

    J-GLOBAL

    researchmap

    その他リンク: http://hdl.handle.net/10191/5775

▶ 全件表示

書籍等出版物

  • 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( 担当: 分担執筆 ,  範囲: 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年9月  ( ISBN:9784861048586

     詳細を見る

    総ページ数:646p   記述言語:日本語

    CiNii Books

    researchmap

  • 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( 担当: 分担執筆 ,  範囲: 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年7月  ( ISBN:9784861047190

     詳細を見る

    総ページ数:721   担当ページ:95-107   記述言語:日本語 著書種別:学術書

    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。

    researchmap

  • 粉体・ナノ粒子の創製と製造・処理技術

    小波盛佳, 松本幹治, 坂本秀一ほ( 担当: 共著 ,  範囲: 3.8節「粉体層の音響特性とその利用」を執筆)

    テクノシステム  2014年11月  ( ISBN:9784924728721

     詳細を見る

    記述言語:日本語 著書種別:学術書

    粉体およびナノ粒子を創成し取り扱う技術には、近年目覚ましい発達が見られる。特に機能性粒子、ナノ粒子の創製では多くの方法が試され、実用化に向かっている。粉体であることの優位性が十分に発揮されつつあると言えるだろう。その技術、実用化の動向について解説する。 一方、粉体を扱うプロセスは多様で、多くのトラブルが発生しやすいというジレンマがある。 本書では、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す。また粉体を取り扱う上での多くの技術について説明し、トラブルを解説する。

    researchmap

  • Handbook of Mechanical Engineering

    Karl-Heinrich Grote, Erik K. Antonsson, Shuichi Sakamoto( 担当: 共著 ,  範囲: 787-818)

    Springer  2009年2月 

     詳細を見る

    記述言語:英語 著書種別:学術書

    researchmap

  • 管内空気柱の共振周波数を利用した変位及び長さ測定の研究

    坂本秀一

    1991年2月 

     詳細を見る

    記述言語:日本語

    researchmap

MISC

講演・口頭発表等

▶ 全件表示

産業財産権

  • 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

     詳細を見る

    出願番号:特願平7-187973  出願日:1995年6月

    公開番号:特開平9-15020  公開日:1997年1月

    researchmap

受賞

  • 日本機械学会 優秀講演論文賞

    1997年3月   日本機械学会(生産加工・機械工作部門)  

    相田収平, 一宮亮一, 山田正直, 坂本秀一, 松村成生

     詳細を見る

    受賞区分:国内学会・会議・シンポジウム等の賞  受賞国:日本国

    researchmap

  • 日本機械学会 研究奨励賞

    1996年4月   日本機械学会  

    坂本秀一

     詳細を見る

    受賞区分:学会誌・学術雑誌による顕彰  受賞国:日本国

    researchmap

共同研究・競争的資金等の研究

  • 流体-固体境界の音響透過性の制御による空力騒音の効果的な低減技術の研究

    研究課題/領域番号:23K03747

    2023年4月 - 2026年3月

    制度名:科学研究費助成事業

    研究種目:基盤研究(C)

    提供機関:日本学術振興会

    寺島 修, 坂本 秀一, 稲澤 歩, 小松崎 俊彦

      詳細を見る

    配分額:4680000円 ( 直接経費:3600000円 、 間接経費:1080000円 )

    researchmap

  • 軽量で微細な粉体による革新的な吸音機構の解明

    研究課題/領域番号:20K04359

    2020年4月 - 2023年3月

    制度名:科学研究費助成事業

    研究種目:基盤研究(C)

    提供機関:日本学術振興会

    坂本 秀一

      詳細を見る

    配分額:4420000円 ( 直接経費:3400000円 、 間接経費:1020000円 )

    単純立方格子と六方格子の2つのモデルを扱い、粒径数mmの粒状材料を充填した構造の吸音率を測定した。さらに、多数のパラメータを必要としない1次元伝達行列法を用いた簡便かつ正確な理論解析を行った。単純立方格子と比較して,六角格子は隙間の容積が小さいため,隙間内の境界層の割合が大きく、それによる粘性摩擦の影響が大きくなり、吸音率のピークが高くなった。また、提案した解析手法で得られた理論値は、実験値と概ね一致した。これらの結果を集約し学術雑誌に論文として1編を発表した(研究発表の欄に記載)。
    粒径や嵩密度が小さく、粉体粒子の縦振動により低周波で特異な吸音特性を示す「軽量・微細粉体」について、粒子径や嵩密度がどのような値であれば、特異な吸音特性が得られるかは、これまで不明であった。そこで、粉体諸元と吸音特性の関係を明らかにし、蓄積されたデータをもとに、実験式から粉体層の吸音率を予測できるようになった。得られた実験式を用いることで、各粉体の特性のみから吸音率を推定する方法を示すことができた。この結果について、学会にて1件の口頭発表を行った(研究発表の欄に記載)。
    粒状材料を充填した構造物に関して、六方最密充填構造および面心立方格子と、ランダム充填構造の吸音特性を理論解析により評価した。規則充填構造については、粒状体の表面積と空隙の体積の正確な値を用いて理論解析を行い、ランダム充填構造については、CTスキャンによる断面画像を用いて理論解析を行った。推定精度を向上させるため、超音波センサーを用いて迷路度を測定し、理論解析に考慮した。この結果について、学会にて1件の口頭発表を行った(研究発表の欄に記載)。

    researchmap

  • 光音響学的手法による異材接合部の非破壊評価技術の開発

    研究課題/領域番号:18H01722

    2018年4月 - 2022年3月

    制度名:科学研究費助成事業

    研究種目:基盤研究(B)

    提供機関:日本学術振興会

    佐々木 朋裕, 坂本 秀一, プラムディタ ジョナス

      詳細を見る

    配分額:17160000円 ( 直接経費:13200000円 、 間接経費:3960000円 )

    マルチマテリアル化を背景に異種金属,および金属とプラスチックなどの異種材料接合体を対象とした非破壊検査技術の開発を試みた.光学計測においては,レーザー干渉計(ESPI)を応用し,熱膨張や音響振動などの可逆的な変形を接合体に与えた際の変位挙動を動的,かつ2次元的に可視化する装置を製作した.本装置を利用した変形解析により,接合プロセスで生じる欠陥,特に残留応力の状態を非破壊,かつ広視野で推定する新しい技術の可能性を見出した.

    researchmap

  • バイオマスを利用した吸音材料の実験的・理論的研究

    研究課題/領域番号:16K06151

    2016年4月 - 2019年3月

    制度名:科学研究費助成事業

    研究種目:基盤研究(C)

    提供機関:日本学術振興会

    坂本 秀一

      詳細を見る

    担当区分:研究代表者  資金種別:競争的資金

    配分額:4940000円 ( 直接経費:3800000円 、 間接経費:1140000円 )

    バイオマス材料を利用したカーボンニュートラルな吸音材料の開発と、音響構造の理論的な解析を行う。

    researchmap

  • 多様な学習歴を活かした工学系高度専門職業人養成カリキュラムの開発

    研究課題/領域番号:26301042

    2014年4月 - 2019年3月

    制度名:科学研究費助成事業

    研究種目:基盤研究(B)

    提供機関:日本学術振興会

    佐藤 孝, 清水 忠明, 坂本 秀一, 後藤 康志, 佐々木 朋裕, 岡 徹雄, 田邊 裕治, 平尾 篤利

      詳細を見る

    配分額:13520000円 ( 直接経費:10400000円 、 間接経費:3120000円 )

    課題探求能力と国際的競争力を持った人材の育成を目指す工学教育の検討を行った結果,工学教育におけるダイバーシティの重要性が明らかになった。日本には,工業高校から工学系大学院まで,教育システムとしては様々なレベルの工学教育がある。また,留学生や工学系の女子学生は増えつつあるが,まだ工学教育の中心にはなっていない。
    工学教育におけるダイバーシティは,日本国内において必要であると同時に,グローバル化された国際社会への日本の貢献の観点からも必要である。今後は,工学製品だけでなく,工学教育システムの輸出も含めて,日本の工学教育システムのグローバル化が重要である。

    researchmap

  • バイオマスを利用した吸音材料に関する研究

    研究課題/領域番号:24560253

    2012年4月 - 2015年3月

    制度名:科学研究費助成事業

    研究種目:基盤研究(C)

    提供機関:日本学術振興会

    坂本 秀一

      詳細を見る

    資金種別:競争的資金

    配分額:5200000円 ( 直接経費:4000000円 、 間接経費:1200000円 )

    バイオマス材料を利用したカーボンニュートラルな吸音材料の開発と、音響構造の解析を行う。

    researchmap

  • TEシャント弁内蔵型人工喉頭の実用化開発

    2011年12月 - 2012年7月

    制度名:受託研究(一般受託研究)

    提供機関:独立行政法人科学技術振興機構(JST)

      詳細を見る

    資金種別:競争的資金

    配分額:1700000円

    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))

    researchmap

  • 室内ドアの消音構造に関する研究

    2011年10月 - 2012年9月

    制度名:共同研究(国内共同研究)

    提供機関:株式会社LIXIL

      詳細を見る

    資金種別:競争的資金

    配分額:1000000円

    民間企業との共同研究につき、詳細は割愛。

    researchmap

  • 昆虫類の飛翔音の測定と解析

    2010年9月 - 2011年6月

    制度名:共同研究(国内共同研究)

    提供機関:株式会社新潟TLO

      詳細を見る

    資金種別:競争的資金

    配分額:500000円

    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。

    researchmap

  • 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年7月 - 2007年1月

    制度名:受託研究

    提供機関:独立行政法人科学技術振興機構 JSTサテライト新潟

      詳細を見る

    資金種別:競争的資金

    配分額:885500円

    researchmap

  • ブンゼン気化式バーナーの「シュー」音低減

    2004年7月 - 2005年3月

    制度名:共同研究(国内共同研究)

    提供機関:ダイニチ工業株式会社

      詳細を見る

    資金種別:競争的資金

    配分額:700000円

    企業との共同研究につき割愛

    researchmap

  • 音響を利用した薄膜材料の非接触枚数検出法に関する研究

    研究課題/領域番号:16560205

    2004年4月 - 2005年

    制度名:科学研究費助成事業

    研究種目:基盤研究(C)

    提供機関:日本学術振興会

    坂本 秀一

      詳細を見る

    資金種別:競争的資金

    配分額:3400000円 ( 直接経費:3400000円 )

    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。

    researchmap

  • 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

    研究課題/領域番号:11750096

    1999年4月 - 2000年

    制度名:科学研究費助成事業

    研究種目:奨励研究(A)

    提供機関:日本学術振興会

    坂本 秀一

      詳細を見る

    資金種別:競争的資金

    配分額:2500000円 ( 直接経費:2500000円 )

    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。

    researchmap

  • 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

    研究課題/領域番号:09750136

    1997年4月 - 1998年

    制度名:科学研究費助成事業

    研究種目:奨励研究(A)

    提供機関:日本学術振興会

    坂本 秀一

      詳細を見る

    資金種別:競争的資金

    配分額:2200000円 ( 直接経費:2200000円 )

    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。

    researchmap

  • 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

    研究課題/領域番号:08750137

    1996年4月 - 1996年

    制度名:科学研究費助成事業

    研究種目:奨励研究(A)

    提供機関:日本学術振興会

    坂本 秀一

      詳細を見る

    資金種別:競争的資金

    配分額:1100000円 ( 直接経費:1100000円 )

    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。

    researchmap

  • 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

    研究課題/領域番号:07750133

    1995年4月 - 1995年

    制度名:科学研究費助成事業

    研究種目:奨励研究(A)

    提供機関:日本学術振興会

    坂本 秀一

      詳細を見る

    資金種別:競争的資金

    配分額:1000000円 ( 直接経費:1000000円 )

    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。

    researchmap

  • 音響の周波数を利用して薄膜の厚さを測定する新しい方法の開発

    研究課題/領域番号:07555039

    1995年 - 1996年

    制度名:科学研究費助成事業

    研究種目:基盤研究(B)

    提供機関:日本学術振興会

    一宮 亮一, 坂本 秀一

      詳細を見る

    配分額:5400000円 ( 直接経費:5400000円 )

    剛体と薄膜との間に適当な厚さの空気層を設けて薄膜の上部から音波を放射すると、薄膜と空気層が共振し、その共振周波数が膜の厚さによって変化する現象を利用して膜の厚さを測定する新しい方法を考案したので、これについて将来実用化出来るように実験を行った。さらに薄膜のみならず薄い板についても実験を試みて、次のような結果を得ることができた。
    *膜の上方に設置するマイクロホンの位置による共鳴周波数の変化はほとんど無く、膜の上方であれば影響がないことが明らかになった。
    *膜の面密度により共鳴周波数が変化することは以前にポリエチレン膜についても実験しており、今回の実験においても、他の材質すなわち、塩化ビニール、アクリル、ナイロンについても同様の傾向が得られ、共鳴周波数を利用して広く膜の厚さが測定できることが明らかとなった。
    *音源からの音響に広帯域のホワイトノイズを使用する実験と、正弦波の純音をスイ-プさせる実験では、共鳴周波数は同じ結果を得た。
    *薄膜では音響出力の小さい音源でも利用できるが、膜が厚くなると音源の出力に配慮が必要になる。
    *被測定物が板状になると、板と空気層の共鳴が発生し難くなり、板の厚さと共鳴周波数に薄膜のような比例関係が得られなくなる。そのため測定精度は悪く、厚くなると測定不可能になる。
    *薄膜の場合にはこの方法で厚さを測定することの実用性が高まった。

    researchmap

  • 音波の位相変化を利用した円筒加工物軸径の新しい計測方法に関する研究

    研究課題/領域番号:07650136

    1995年 - 1996年

    制度名:科学研究費助成事業

    研究種目:基盤研究(C)

    提供機関:日本学術振興会

    一宮 亮一, 坂本 秀一

      詳細を見る

    配分額:2400000円 ( 直接経費:2400000円 )

    円筒軸に音波を入射すると散乱、回折し、位相が変化することを利用して、位相角の遅れ量から円筒軸径を求める安価で、非接触、高精度な計測法の計測法の開発を試みた。平面スピーカ、マイクロホンおよびFFTアナライザーを用いた実験及び一次元平面音波の無限長剛体円筒軸による散乱音場の理論解析を行い、両者の比較をした。
    さらに、精度の向上を図るため、一対の反射壁を入射音波と平行に対向させて設置した場合について、理論解析及び実験を行って、軸直径と音圧の位相角の遅れ量との関係も求めた。解析は振動板による反射を零とした場合及び剛体反射壁がない場合についても行い、それらによる影響について検討した。
    これらのことから以下のような結論を得た。
    (1)位相角の遅れ量と軸径とは広範囲にわたりほぼ比例関係にあり、本方法が有用であり、かつ測定範囲が広いことを確認した。
    (2)実験結果と振動板による反射を考慮した理論結果は良く一致した。
    (3)振動板及び装置壁面による反射により位相角の遅れ量は変化し、無視できないことがわかった。
    (4)周波数は1500Hz以下の場合、明確な反射壁による反射の影響は現れなかった。しかし、2000Hz以上で、かつ位相角の遅れ量がある程度大きくなる場合には、ある直径において位相角の遅れ量が急変する現象が現れ、速度精度が向上する効果が得られることを確認した。なお、実験では±0.01mmの精度まで改善されることを確認した。

    researchmap

  • 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

    研究課題/領域番号:01790363

    1989年 - 1990年

    制度名:科学研究費助成事業

    研究種目:奨励研究(特別研究員)

    提供機関:日本学術振興会

    坂本 秀一

      詳細を見る

    配分額:1900000円 ( 直接経費:1900000円 )

    researchmap

▶ 全件表示

 

担当経験のある授業科目(researchmap)

  • 材料生産システム特定研究Ⅱ

    機関名:新潟大学

     詳細を見る

  • 研究発表演習・発表

    機関名:新潟大学

     詳細を見る

  • 機械科学文献詳読Ⅰ

    機関名:新潟大学

     詳細を見る

  • 機械科学文献詳読Ⅱ

    機関名:新潟大学

     詳細を見る

  • 機械科学特別演習

    機関名:新潟大学

     詳細を見る

  • リメディアル演習(機械数理)

    機関名:新潟大学

     詳細を見る

  • 創造工学実習

    機関名:新潟大学

     詳細を見る

  • 機械設計I

    機関名:新潟大学

     詳細を見る

  • 応用数理A

    機関名:新潟大学

     詳細を見る

  • 機械音響工学論

    機関名:新潟大学

     詳細を見る

  • 機械音響工学

    機関名:新潟大学

     詳細を見る

  • 異文化と技術

    機関名:新潟大学

     詳細を見る

  • 応用音響学

    機関名:新潟大学

     詳細を見る

  • 機械科学セミナーⅡ

    機関名:新潟大学

     詳細を見る

  • 企業における生産・開発

    機関名:新潟大学

     詳細を見る

  • 機械科学総論

    機関名:新潟大学

     詳細を見る

  • 切削加工

    機関名:新潟大学

     詳細を見る

  • 機械工学演習

    機関名:新潟大学

     詳細を見る

  • スタディスキルズ(機械工学基礎)

    機関名:新潟大学

     詳細を見る

  • 機械工学実験II

    機関名:新潟大学

     詳細を見る

  • 機械工学実験I

    機関名:新潟大学

     詳細を見る

  • 工学リテラシー入門(力学分野)

    機関名:新潟大学

     詳細を見る

  • 工学リテラシー入門(機械システム工学科)

    機関名:新潟大学

     詳細を見る

  • 機械工作実習II

    機関名:新潟大学

     詳細を見る

  • 機械工作実習I

    機関名:新潟大学

     詳細を見る

  • くらしを支える機械システム工学

    機関名:新潟大学

     詳細を見る

  • 加工学I

    機関名:新潟大学

     詳細を見る

  • 材料生産システム特定研究Ⅰ

    機関名:新潟大学

     詳細を見る

  • 機械科学セミナーⅠ

    機関名:新潟大学

     詳細を見る

▶ 全件表示

担当経験のある授業科目

  • 加工学

    2022年
    -
    現在
    機関名:新潟大学

  • 創造研究プロジェクトI

    2022年
    -
    現在
    機関名:新潟大学

  • 創造プロジェクトI

    2022年
    -
    現在
    機関名:新潟大学

  • 創造プロジェクトII

    2022年
    -
    現在
    機関名:新潟大学

  • 創造研究プロジェクトII

    2022年
    -
    現在
    機関名:新潟大学

  • 創造プロジェクト基礎

    2022年
    -
    現在
    機関名:新潟大学

  • 異文化と技術

    2021年
    -
    現在
    機関名:新潟大学

  • 応用音響学

    2021年
    -
    現在
    機関名:新潟大学

  • 安全工学基礎

    2021年
    -
    2022年
    機関名:新潟大学

  • 卒業研究

    2020年
    -
    現在
    機関名:新潟大学

  • 先端研究入門

    2020年
    -
    現在
    機関名:新潟大学

  • 機械工学実験IV

    2020年
    -
    現在
    機関名:新潟大学

  • 英文輪読II

    2020年
    -
    現在
    機関名:新潟大学

  • 機械工学実験III

    2020年
    -
    現在
    機関名:新潟大学

  • 英文輪読I

    2019年
    -
    現在
    機関名:新潟大学

  • 卒業研修

    2019年
    -
    現在
    機関名:新潟大学

  • 機械工作実習III

    2018年
    -
    現在
    機関名:新潟大学

  • 加工学I

    2018年
    -
    2021年
    機関名:新潟大学

  • 工学リテラシー入門(力学分野)

    2017年
    -
    現在
    機関名:新潟大学

  • 物理工学実験

    2017年
    -
    現在
    機関名:新潟大学

  • 機械工学概論

    2017年
    -
    現在
    機関名:新潟大学

  • 機械工学実験I

    2016年
    -
    現在
    機関名:新潟大学

  • 機械工学演習

    2016年
    -
    現在
    機関名:新潟大学

  • 機械工学実験II

    2016年
    -
    現在
    機関名:新潟大学

  • 切削加工

    2015年
    -
    2017年
    機関名:新潟大学

  • 機械科学総論

    2014年
    機関名:新潟大学

  • 企業における生産・開発

    2014年
    機関名:新潟大学

  • 機械科学セミナーⅠ

    2012年
    -
    2015年
    機関名:新潟大学

  • 機械科学文献詳読Ⅰ

    2012年
    -
    2015年
    機関名:新潟大学

  • 材料生産システム特定研究Ⅱ

    2012年
    -
    2015年
    機関名:新潟大学

  • 研究発表演習・発表

    2012年
    -
    2015年
    機関名:新潟大学

  • 機械科学文献詳読Ⅱ

    2012年
    -
    2015年
    機関名:新潟大学

  • 機械科学特別演習

    2012年
    -
    2015年
    機関名:新潟大学

  • 材料生産システム特定研究Ⅰ

    2012年
    -
    2015年
    機関名:新潟大学

  • 機械科学セミナーⅡ

    2012年
    -
    2015年
    機関名:新潟大学

  • くらしを支える機械システム工学

    2010年
    -
    現在
    機関名:新潟大学

  • 機械工作実習I

    2009年
    -
    現在
    機関名:新潟大学

  • 機械工作実習II

    2009年
    -
    現在
    機関名:新潟大学

  • 工学リテラシー入門(機械システム工学科)

    2009年
    -
    2016年
    機関名:新潟大学

  • スタディスキルズ(機械工学基礎)

    2008年
    機関名:新潟大学

  • 機械設計I

    2007年
    -
    現在
    機関名:新潟大学

  • 機械音響工学論

    2007年
    -
    現在
    機関名:新潟大学

  • 機械音響工学

    2007年
    -
    現在
    機関名:新潟大学

  • 応用音響学

    2007年
    -
    2019年
    機関名:新潟大学

  • 異文化と技術

    2007年
    -
    2018年
    機関名:新潟大学

  • リメディアル演習(機械数理)

    2007年
    -
    2015年
    機関名:新潟大学

  • 創造工学実習

    2007年
    -
    2015年
    機関名:新潟大学

  • 応用数理A

    2007年
    -
    2009年
    機関名:新潟大学

▶ 全件表示

教育活動に関する受賞

  • Best Presentation Award (ポスター発表賞)

    2010年8月   日本工学教育協会  

    受賞者:櫻井篤, 松原幸治, 鳴海敬倫, 坂本秀一, 岩部洋育, 渡辺健彦

    教育GP「つもり学習からの脱却」-機械系の実施事例-

その他教育活動及び特記事項

  • ドイツ・マグデブルグ大学との夏の学校2012の受入(副実行委員長)

    2012年9月

  • ドイツ・マグデブルグ大学との夏の学校2010の受入(実行委員長)

    2010年8月 - 2010年9月

  • 機械システム工学科 学年担当

    2009年4月 - 2012年3月

  • ドイツ・マグデブルグ大学との夏の学校2008の受入

    2008年8月 - 2008年9月

  • ドイツ・マグデブルグ大学との夏の学校2007の引率

    2007年8月 - 2007年9月

  • ドイツ・マグデブルグ大学との夏の学校2006の受入

    2006年8月 - 2006年9月

  • ドイツ・マグデブルグ大学との夏の学校2005の引率

    2005年8月 - 2005年9月

  • ドイツ・マグデブルグ大学との夏の学校2004の受入

    2004年8月 - 2004年9月

  • 機械システム工学科 学年担当

    2004年4月 - 2007年3月

  • ドイツ・マグデブルグ大学との夏の学校2002の受入

    2002年8月 - 2002年9月

  • ドイツ・マグデブルグ大学との夏の学校2001の運営

    2001年8月 - 2001年9月

  • ドイツ・マグデブルグ大学との夏の学校2000の受入

    2000年8月 - 2000年9月

  • ドイツ・マグデブルグ大学との夏の学校1999の引率

    1999年8月 - 1999年9月

  • ドイツ・マグデブルグ大学との夏の学校1998の受入

    1998年8月 - 1998年9月

  • ドイツ・マグデブルグ大学との夏の学校1996の受入

    1996年8月 - 1996年9月

▶ 全件表示