2021/08/06 更新

写真a

オオシマ タクヤ
大嶋 拓也
OHSHIMA Takuya
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
工学部 工学科 准教授
職名
准教授
外部リンク

学位

  • 修士(工学) ( 1998年3月   東京大学 )

  • 博士(環境学) ( 2005年9月   東京大学 )

研究キーワード

  • 都市音響学

  • 音響数値解析

  • 計算空力音響学

  • 屋外音響伝搬

研究分野

  • 社会基盤(土木・建築・防災) / 建築環境、建築設備

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   環境計画   准教授

    2013年10月 - 2017年3月

  • 新潟大学   自然科学研究科 環境科学専攻   助教

    2010年4月 - 2013年9月

  • 新潟大学   建設学科   助教

    2000年11月 - 2013年9月

所属学協会

▶ 全件表示

 

論文

  • SciPy 1.0: fundamental algorithms for scientific computing in Python 査読 国際誌

    Pauli Virtanen, Ralf Gommers, Travis E. Oliphant, Matt Haberland, Tyler Reddy, David Cournapeau, Evgeni Burovski, Pearu Peterson, Warren Weckesser, Jonathan Bright, Stéfan J. van der Walt, Matthew Brett, Joshua Wilson, K. Jarrod Millman, Nikolay Mayorov, Andrew R. J. Nelson, Eric Jones, Robert Kern, Eric Larson, C J Carey, İlhan Polat, Yu Feng, Eric W. Moore, Jake VanderPlas, Denis Laxalde, Josef Perktold, Robert Cimrman, Ian Henriksen, E. A. Quintero, Charles R. Harris, Anne M. Archibald, Antônio H. Ribeiro, Fabian Pedregosa, Paul van Mulbregt, Aditya Vijaykumar, Alessandro Pietro Bardelli, Alex Rothberg, Andreas Hilboll, Andreas Kloeckner, Anthony Scopatz, Antony Lee, Ariel Rokem, C. Nathan Woods, Chad Fulton, Charles Masson, Christian Häggström, Clark Fitzgerald, David A. Nicholson, David R. Hagen, Dmitrii V. Pasechnik, Emanuele Olivetti, Eric Martin, Eric Wieser, Fabrice Silva, Felix Lenders, Florian Wilhelm, G. Young, Gavin A. Price, Gert-Ludwig Ingold, Gregory E. Allen, Gregory R. Lee, Hervé Audren, Irvin Probst, Jörg P. Dietrich, Jacob Silterra, James T Webber, Janko Slavič, Joel Nothman, Johannes Buchner, Johannes Kulick, Johannes L. Schönberger, José Vinícius de Miranda Cardoso, Joscha Reimer, Joseph Harrington, Juan Luis Cano Rodríguez, Juan Nunez-Iglesias, Justin Kuczynski, Kevin Tritz, Martin Thoma, Matthew Newville, Matthias Kümmerer, Maximilian Bolingbroke, Michael Tartre, Mikhail Pak, Nathaniel J. Smith, Nikolai Nowaczyk, Nikolay Shebanov, Oleksandr Pavlyk, Per A. Brodtkorb, Perry Lee, Robert T. McGibbon, Roman Feldbauer, Sam Lewis, Sam Tygier, Scott Sievert, Sebastiano Vigna, Stefan Peterson, Surhud More, Tadeusz Pudlik, Takuya Oshima, Thomas J. Pingel, Thomas P. Robitaille, Thomas Spura, Thouis R. Jones, Tim Cera, Tim Leslie, Tiziano Zito, Tom Krauss, Utkarsh Upadhyay, Yaroslav O. Halchenko, Yoshiki Vázquez-Baeza

    Nature Methods   17   261 - 272   2020年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/s41592-019-0686-2

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  • Influence of weather on the acoustical properties of a ground surface: measurements and models 査読

    Kurosaka Yumi, Oshima Takuya, Honda Meiji

    NOISE CONTROL ENGINEERING JOURNAL   66 ( 6 )   505 - 522   2018年12月

  • Numerical analysis of three-dimensional acoustic field with background flow using constrained interpolation profile method 査読

    Fukuda Akihiro, Okubo Kan, Oshima Takuya, Tsuchiya Takao, Kanamori Masashi

    JAPANESE JOURNAL OF APPLIED PHYSICS   57 ( 7 )   2018年7月

  • 地表面上の点音源による音場の拡張・局所作用理論モデル解析および有限差分数値解析の適用性に関する検討

    大嶋 拓也, 黒坂 優美

    日本建築学会環境系論文集   83 ( 746 )   355 - 363   2018年4月

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

     The problem of sound field from a point source in the static air above an absorptive ground surface has been extensively studied in literature as the setting is typical for outdoor sound propagation. Most of the theoretical models that deal with the problem are classified as either extended reaction models that are considered physically exact, or local reaction models that are considered approximations. Especially, approximations assuming the local reaction are introduced in many models. However, the validity of the assumption is elucidated through comparison with the extended reaction models only in limited cases. This is because the reliability of the extended reaction models are difficult to be assured as the derivation process of the extended reaction models are generally complex and sometimes unintentionally transforms the models to local reaction models. In contrast, with the advancement of numerical simulation techniques, a numerical model based on a finite-difference time-domain method that solves the propagation above and under the ground surface simultaneously by handling the soil under the ground surface as a porous medium has been proposed by Salomons. The numerical model is regarded as an extended reaction model because the model solves the propagation under the ground surface. Hence, the reliability of the extended reaction models can be assured through mutual comparison of the numerical and the extended reaction models. However, the comparison has only been made under limited conditions of low effective flow resistivities and short-range propagations under low frequencies. The applicability to high effective flow resistivities and long-range propagation under medium and high frequencies remains to be an open question.<br> In the present study, the validity and applicability of an extended reaction model by Di, a local reaction model by Di, an asymptotic local reaction model by Kawai and the aforementioned finite-difference time-domain numerical model are tested. Main variables are the frequency, the effective flow resistivity under the ground surface, the source height and the source-receiver horizontal distance, which are chosen to be in ranges of 125 Hz–4 kHz, 75–20 000 kPa·s/m<sup>2</sup>, 0.3–2.4 m and 5–80 m, respectively. The validity of two-dimensional modeling is tested and the two-dimensional modeling is applied for the numerical model because vast domain sizes are required. From the results, the followings are found.<br> 1. The validity of the tested extended reaction model is confirmed under low effective flow resistivity conditions from a good match between the extended reaction and the numerical models.<br> 2. The local reaction is considered as a valid assumption within the tested variable ranges because the maximum difference between the extended and local models are 1.2 dB.<br> 3. The asymptotic local reaction model is applicable within the tested variable ranges because the two local reaction models are excellent match.<br> 4. The numerical model differs from the extended and the local reaction models under low source height, long range and high effective flow resistivity conditions. From a further investigation, it is found that the difference is possibly due to the handling of the medium interface in the numerical model. Using a local reaction boundary condition that takes the frequency characteristics of the boundary into account can be a potential solution.

    DOI: 10.3130/aije.83.355

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  • A basic investigation for prediction of outdoor sound propagation in large area using fast multipole boundary element method 査読

    Yosuke Yasuda, Hidehisa Sekine, Kazutaka Higuchi, Takuya Oshima

    Acoustical Science and Technology   37 ( 2 )   87 - 90   2016年

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

    The applicability of the FMBEM to large outdoor problems was basically investigated. Conclusions are as follows. (i) The computational costs of the LF-FMBEM have no systematic relation with model size (root cell size) up to 1-km scale models. (ii) An increase in the root cell size directly increases the computational costs of the HF-FMBEM. (iii) It is much more inefficient in the HF-FMBEM to simply reduce the largest cell size used for computation with keeping high computational accuracy. (iv) An empirical formula proposed in Ref. [7] for the truncation number of infinite summation in the HF-FMBEM gives good values for high computational accuracy even in the range of kD ≤ 4
    000, which corresponds to f ≤ 2
    500 Hz with the root cell 200m on each side, if an appropriate value is chosen for its parameter.

    DOI: 10.1250/ast.37.87

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  • Distinct effects of moisture and air contents on acoustic properties of sandy soil 査読

    Takuya Oshima, Yasuhiro Hiraguri, Takeshi Okuzono

    JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA   138 ( 3 )   EL258 - EL263   2015年9月

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

    Knowledge of distinct effects of moisture content and air volume on acoustic properties of soil is sought to predict the influence of human activities such as cultivation on acoustic propagation outdoors. This work used an impedance tube with the two-thickness method to investigate such effects. For a constant moisture weight percentage, the magnitude of the characteristic impedance became smaller and the absorption coefficient became higher with increase of the air space ratio. For a constant air space ratio, the absorption coefficient became larger and the magnitude of the propagation constant became smaller with increasing moisture weight percentage. (C) 2015 Acoustical Society of America

    DOI: 10.1121/1.4929736

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  • Three-dimensional urban acoustic simulations and scale-model measurements over real-life topography 査読

    Takuya Oshima, Takashi Ishizuka, Takahide Kamijo

    JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA   135 ( 6 )   EL324 - EL330   2014年6月

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

    Comparisons of finite-difference time-domain sound propagation simulations over real-life urban topography with scale-model experimental measurements are performed. A 1:100 scale model for the measurements and full-scale input geometry for the simulations are created by using digital geographic datasets. The sound pressure levels obtained by the measurements and simulations resulted in approximately 2 dB of root mean square error in the 125 and 250 Hz octave bands, and 4 dB in 500 Hz. Visualizations of a low-frequency sound propagation case by the measurement and simulation clearly show the wave phenomena caused by buildings and natural terrain. (C) 2014 Acoustical Society of America

    DOI: 10.1121/1.4879672

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  • 住宅用エアコンのCOPの現状とAPFの地域特性に関する研究

    赤林 伸一, 坂口 淳, 大嶋 拓也, 市川 裕幸, 有波 裕貴

    日本建築学会技術報告集   20 ( 44 )   187 - 190   2014年2月

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    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:日本建築学会  

    A conventional selection criterion of room air conditioners based on rated performance is considered suboptimal from the standpoint of energy efficiency. In order to help consumers evaluate energy performance, annual performance factor (APF) was introduced in the 2005 revision of JIS C 9612. However, APF assumes thermal environment of Tokyo, which makes regional deviation of APF remain unknown. In the present study, rated coefficients of performance (COPs) and market prices of year 2012 models of air conditioners are collected. From the collection, APFs are calculated at nine representative cities in Japan to quantify regional characteristics of APF.

    DOI: 10.3130/aijt.20.187

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  • Geometry reconstruction and mesh generation techniques for acoustic simulations over real-life urban areas using digital geographic information

    Takuya Oshima, Yasuhiro Hiraguri, Masashi Imano

    Acoustical Science and Technology   35 ( 2 )   108 - 118   2014年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    With the recent progresses in computer performance and simulation techniques, it is becoming feasible to apply full three-dimensional wave-based numerical simulation techniques to large-scale problems of real-life sound propagation outdoors. In the present paper, a reconstruction technique for real-life urban geometries with full reproduction of the roof shapes and for the ground profiles using digital geographic information is presented. Also, a generation technique for the uniform rectilinear grid used in finite-difference time-domain simulations is presented. The types of geographic dataset used for the reconstruction are a digital surface model and a two-dimensional building outline map. For comparison, another geometry with flat building roofs, which is the type of geometry used in former noise-mapping studies using empirical models, is created. Comparison of the results of finitedifference time-domain acoustic simulations performed over the geometries shows sound pressure level differences above and behind buildings. The maximum level difference of 10 dB in magnitude indicates the necessity of proper reconstruction of the roof shapes in real-life urban acoustic simulations. © 2014 The Acoustical Society of Japan.

    DOI: 10.1250/ast.35.108

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  • Linearized Euler simulations of sound propagation with wind effects over a reconstructed urban terrain using digital geographic information 査読

    Takuya Oshima, Masashi Imano, Yasuhiro Hiraguri, Yoshikazu Kamoshida

    APPLIED ACOUSTICS   74 ( 12 )   1354 - 1366   2013年12月

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

    The procedure of sound propagation calculation employing the linearized Euler (LE) model has been known to be complex because the procedure requires a chaining of two distinct simulations, namely a fluid dynamics simulation (CFD) in order to solve the background flow field, and a succeeding sound propagation simulation using the LE model over the flow field. The complexity is considered one of the main reasons why the most of the applications of the model remain in investigations assuming highly abstract geometries. In the study, a streamlined workflow is established for LE simulations over a complex urban terrain with its reconstruction utilizing digital geographic models which provide building outline maps and digital surface elevation information. Focus is given to automatic geometry reconstruction and mesh generations of realistic urban terrain. Subsequent processes of CFD and LE simulations are validated through comparisons with published results of wind-tunnel tests and with theoretical solutions. The workflow is deployed to an actual urban terrain of Nagaoka, Japan. The present technique generates a good reconstruction of urban geometry and subsequent split-hexahedral unstructured grid for CFD software and uniform structured mesh for finite-difference LE simulation. The numerical experiments show differences of up to 5 dB between sound pressure levels obtained by the present reconstruction technique and those by a flat-roof geometry. Also, the wind effects are mostly representable in terms of the source-observation point distance in spite of the complex urban configuration. Subtle wind effects of less than 0.5 dB are observed in crosswind condition as well. (c) 2013 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.apacoust.2013.05.006

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  • 室内気流模型を対象としたシーディング手法の検討及び測定結果:室内気流を対象としたPIV計測に関する研究 その1

    赤林 伸一, 大嶋 拓也, 有波 裕貴, 大久保 肇, 楊 暁韻, 坂口 淳

    日本建築学会環境系論文集   78 ( 690 )   631 - 638   2013年8月

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    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:日本建築学会  

    This paper describes particle image velocimetry (PIV) air flow measurements in a room model of scale 1:10; the model has inlets and outlets across its width. The PIV measurements use three types of tracer particles: water mist, oil mist, and metal powder. The air flow distribution and turbulence intensity are measured by PIV with metal powder tracers in four combinations of inlet and outlet positions.<br>The results are as follows;<br>(1) Among the three tracer particles, metal powder yields the best air flow measurements in the 1:10-scale room model.<br>(2) To obtain uniform luminance, an appropriate tracer particle concentration and increased laser output are required.<br>(3) When the inlet and outlet are located midway across the scale model, the air flow velocity in the room in nearly symmetrical. In this case, air enters straight through the inlet, is sucked into the outlet, and is largely discharged. The air not discharged from the outlet collides with the side-wall of the outlet to forms a symmetrical vortex area.

    DOI: 10.3130/aije.78.631

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  • 家庭用燃料電池による電力需要のピークカットに関する研究:その1 東北電力管内を対象としたシミュレーション結果

    赤林 伸一, 坂口 淳, 大嶋 拓也, 市川 裕幸, 有波 裕貴

    日本建築学会環境系論文集   78 ( 690 )   639 - 644   2013年8月

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    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:日本建築学会  

    One of the effects of the 2011 Tohoku earthquake and the subsequent power disruptions was an increased demand for electricity. As a result, there have been societal efforts to reduce electricity usage and to provide electrical power more equitably. Private power generation by a fuel cell cogeneration system (FCCGS) recently proposed for home use is expected to advance the efficient utilization of primary energy sources and contribute to energy conservation. In this paper, we present the results of a case study on peak electricity demand by modeling the district served by the Tohoku Electric Power Company. The study analyzes the effects on peak power demand if residences in the district were equipped with FCCGSs. For this study, we assume that the FCCGSs are installed in groups of 100,000 units. The groups are composed of FCCGS units with different rated outputs whose hours of operation throughout the day are distributed among the groups. Power supply, primary energy consumption, and CO<sub>2</sub> emission amounts both before and after the installation of FCCGSs are recorded in order to quantify the cut in peak demand for electricity. The results of the study demonstrate that peak demand can be cut if FCCGSs are installed in 5% or less (in winter) and about 25% (in summer) of all the private residences in the district served by Tohoku Electric Power Company

    DOI: 10.3130/aije.78.639

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  • 騒音・風速2点同時実測による盛土道路周辺の風況及びその音響伝搬への影響調査

    廣井 昂也, 大嶋 拓也

    日本建築学会環境系論文集   78 ( 686 )   317 - 324   2013年4月

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    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:日本建築学会  

    It has been known that the road traffic noise propagation is affected by the wind. However, not so many studies deal with the effect in conjunction with microscopic wind conditions. In the present study, wind conditions around a road embankment and their influence on sound propagation were investigated by two-point simultaneous measurements of noise and wind velocity in an open suburban area. Results show that (1) the wake turbulence by the embankment affects variance in received sound pressure levels, (2) the wind velocity component parallel to the road could also be affecting sound propagation.

    DOI: 10.3130/aije.78.317

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  • 有効換気回数及び有効窓面積率による住宅の通風性能評価に関する研究

    有波 裕貴, 赤林 伸一, 大嶋 拓也, 坂口 淳

    日本建築学会環境系論文集   78 ( 685 )   277 - 284   2013年3月

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    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:日本建築学会  

    The effect of improving indoor environment by the cross ventilation, the rate to discharge thermal energy by the ventilation is larger than the reduction effects of SET<sup>*</sup> by indoor air flow. In this study, the relationship between the difference of indoor temperature and outdoor temperature by the effect of ventilation will be less than 1°C and the opening area of windows ratio are calculated for a simple and the standerd AIJ detached house model. The relationship between the air change rate, opening area of windows conditions and cross ventilation performance of the house is clarified.<br>The results are as follows; <br>(1) When air change rate is 20 times/h, the inside air temperature becomes nearly equal to the outside air temperature due to the discharge thermal energy by the ventilation. <br>(2) The opening area of windows ratio tends to be high in the inland, and it tends to be low in the city along the sea in Japan. <br>(3) Results of standard AIJ detached house model, the opening area of windows ratio with which ventilation rate is 20 times/h becomes a low value of feasibility. The opening area of windows ratio with which ventilation rate is 10 times/h becomes a values that may be realized.

    DOI: 10.3130/aije.78.277

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  • Field measurements on wind effects to propagation of road traffic noise over open and flat ground 査読

    Takuya Oshima, Masaki Ii

    Applied Acoustics   74 ( 1 )   141 - 149   2013年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    There has been carried out a number of experimental studies with regard to wind effects to outdoor sound propagation. Most of the studies deal with propagation from steady-state point source such as a loudspeaker in case of field measurements. However, wind effects to more realistic sources, such as road traffic noise sources which are considered to be time-varying line sources, are hardly known in public literature. In the present study, the wind effects to acoustic propagation from a straight road with intense traffic to an open and flat field were investigated through field measurements in order to specifically illustrate the effects of such sources. Two measurement points were placed at 40 m and 140 m distance from the subject road. The results show that (1) The standard deviations of sound pressure levels (SPLs) at the measurement points were around 2 dB for both receiver distances. (2) The effect of perpendicular component of wind velocity to the road direction was slightly stronger than the ASJ Model which was mostly derived from point-source experiments. (3) The effect of source time-variance was effectively taken out by taking the difference in SPLs at the nearby and distant measurement points, in which case the standard deviations of the excess attenuation were reduced to around 1.3 dB. (4) Slight tendency of coherence magnitude of sound pressure between the receivers converging to zero with increasing turbulent kinetic energy is observed in 125 Hz and 250 Hz bands. Meanwhile, the effect of parallel wind velocity component to the road still remained unclear and thus requires further investigations. © 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.apacoust.2012.07.003

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  • Time-domain outdoor acoustic simulation of a real-life area using land cover classification identified by airborne hyperspectral imagery

    Takuya Oshima, Yasuhiro Hiraguri, Kazuma Hoshi

    Acoustical Science and Technology   34 ( 5 )   364 - 366   2013年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The article examines time-domain outdoor acoustic simulation of a real-life area using land cover classification identified by airborne hyperspectral imagery. In order to solve the identification problem, the authors presented a classification technique of using airborne hyperspectral imagery for land cover types in a real-life area. The simulation employs a porous-medium model for the solution of acoustic absorption by the surfaces. A validation of the porous-medium model through comparisons with exact solutions is given. The results are compared with those obtained assuming perfectly reflecting surfaces. The source is a coherent linear Gaussian pulse with a full width at half maximum of 1.25m and an amplitude of 1 Pa placed on a road, assuming a road traffic noise source.

    DOI: 10.1250/ast.34.364

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  • Basic investigation on estimation of land cover classification conforming to the ASJ RTN-model using hyperspectral imaging data

    Yasuhiro Hiraguri, Takuya Oshima, Kazuma Hoshi

    Acoustical Science and Technology   34 ( 5 )   367 - 370   2013年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    The article presents a possible land cover classification estimation technique specialized for acoustic simulations using high-accuracy hyperspectral imaging data through a case study using a Nagaoka sample. The image was obtained by PASCO Corp. on 5 June 2004 using the Airborne Imaging Spectroradiometer for Application (AISA), which is a hyperspectral sensor with a 1m spatial resolution developed by Spectral Imaging Ltd. The image data comprise 67 bands, covering both the visible and a part of near-infrared wavelengths from 400 nm to 1,000 nm. Spectral band widths are equally spaced by 8-9 nm. The spectrum value at each picture element indicates a normalized spectral reflectance, which is calculated based on the spectral radiance of the ground surface and the sun observed simultaneously. The land cover classification that should be estimated is determined by referring to ASJ RTN-Model 2008 in the first step to discuss classification methods.

    DOI: 10.1250/ast.34.367

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  • Efficient technique in low-frequency fast multipole boundary element method for plane-symmetric acoustic problems 査読

    Yosuke Yasuda, Kazutaka Higuchi, Takuya Oshima, Tetsuya Sakuma

    ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS   36 ( 10 )   1493 - 1501   2012年10月

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

    The fast multipole boundary element method (FMBEM) has been well known as a highly efficient BEM with the use of the fast multipole method (FMM). In the present paper, an efficient technique for plane-symmetric acoustic problems is proposed in the framework of an FMBEM based on the original multipole expansion theory (FMBEM for low-frequency problems: LF-FMBEM). Presented here are concrete computational procedures, which are based on the symmetries among multipole expansion coefficients for a plane-symmetric sound field produced by monopole or dipole sources. The proposed technique is straightforwardly applicable to a variety of formulations for the BEM, such as hypersingular, Burton-Miller, and indirect formulations. Numerical results show an ideal improvement of computational efficiency, with the proposed technique reducing both the computation time and required memory to about 1/2(nsym) of those using the standard LF-FMBEM, where n(sym) is the number of planes of symmetry. (c) 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.enganabound.2012.04.006

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  • 建築環境CAEツールにおけるBIM連携化とCFDパーツ化に関する研究開発

    河野 良坪, 加藤 信介, 久芳 将之, 三木 秀樹, 大嶋 拓也, 大浦 誠, 阪田 升, 柳原 隆司, 石崎 陽児, 一ノ瀬 雅之, 足達 嘉信, 〓 芸〓, 平野 雅之, 池島 薫, 今野 雅, 伊藤 久晴

    空気調和・衛生工学会 論文集   36 ( 174 )   15 - 21   2011年

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    記述言語:日本語   出版者・発行元:公益社団法人 空気調和・衛生工学会  

    近年、建築業務における企画から基本設計、実施設計、施工管理、維持管理など全般に渡って、BIM(Building Information Modeling)の活用が広がりを見せている。空気調和・衛生工学会のBIM・CFDパーツ化小委員会では、実施設計段階における空気調和設計でCFD解析を実行する際に、通常は個々に入力を必要とする空調機器の形状や吹出し口・吸込み口の境界条件などをBIMから抽出し、「CFDパーツ」としてCFDの解析空間内に直接配置する為の仕様策定や普及促進、BIMデータ利用法のガイドラインの作成等に関する検討を行っている。本報では、研究活動の現状や課題を提示すると共に、BIM・CFDパーツ化小委員会の活動の一環である「BIMシミュレーションWG」の取組みとして、空気調和設計において必要な熱負荷計算、そして気流シミュレーションを対象としBIM利用時のデータ連携に関して検証を行ったので、ここに報告する。

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  • FAST MULTIPOLE BOUNDARY ELEMENT METHOD FOR LOW-FREQUENCY ACOUSTIC PROBLEMS BASED ON A VARIETY OF FORMULATIONS 査読

    Yosuke Yasuda, Takuya Oshima, Tetsuya Sakuma, Arief Gunawan, Takayuki Masumoto

    JOURNAL OF COMPUTATIONAL ACOUSTICS   18 ( 4 )   363 - 395   2010年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    The fast multipole boundary element method (FMBEM), which is an efficient BEM that uses the fast multipole method (FMM), is known to suffer from instability at low frequencies when the well-known high-frequency diagonal form is employed. In the present paper, various formulations for a low-frequency FMBEM (LF-FMBEM), which is based on the original multipole expansion theory, are discussed; the LF-FMBEM can be used to prevent the low-frequency instability. Concrete computational procedures for singular, hypersingular, Burton-Miller, indirect (dual BEM), and mixed formulations are described in detail. The computational accuracy and efficiency of the LF-FMBEM are validated by performing numerical experiments and carrying out a formal estimation of the efficiency. Moreover, practically appropriate settings for numerical items such as truncation numbers for multipole/local expansion coefficients and the lowest level of the hierarchical cell structure used in the FMM are investigated; the differences in the efficiency of the LF-FMBEM when different types of formulations are used are also discussed.

    DOI: 10.1142/S0218396X10004243

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  • Numerical analysis of large-scale sound fields using iterative methods part I: Application of Krylov subspace methods to boundary element analysis

    Y. Yasuda, S. Sakamoto, Y. Kosaka, T. Sakuma, N. Okamoto, T. Oshima

    JOURNAL OF COMPUTATIONAL ACOUSTICS   15 ( 4 )   449 - 471   2007年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WORLD SCIENTIFIC PUBL CO PTE LTD  

    The convergence behavior of the Krylov subspace iterative solvers towards the systems with the 3D acoustical BEM is investigated through numerical experiments. The fast multipole BEM, which is an efficient BEM based on the fast multipole method, is used for solving problems with up to about 100,000 DOF. It is verified that the convergence behavior of solvers is much affected by the formulation of the BEM (singular, hypersingular, and Burton-Miller formulation), the complexity of the shape of the problem, and the sound absorption property of the boundaries. In BiCG-like solvers, GPBiCG and BiCGStab2 have more stable convergence than others, and these solvers are useful when solving interior problems in basic singular formulation. When solving exterior problems with greatly complex shape in Burton-Miller formulation, all solvers hardly converge without preconditioning, whereas the convergence behavior is much improved with ILU-type preconditioning. In these cases GMRes is the fastest, whereas CGS is one of the good choices, when taken into account the difficulty of determining the timing of restart for GMRes. As for calculation for rigid thin objects in hypersingular formulation, much more rapid convergence is observed than ordinary interior/exterior problems, especially using BiCG-like solvers.

    DOI: 10.1142/S0218396X07003470

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  • 境界要素音場解析へのKrylov部分空間法の適用 : 反復解法を利用した大規模音場数値解析 その1

    安田 洋介, 小坂 慶之, 岡本 則子, 大嶋 拓也, 佐久間 哲哉, 坂本 慎一

    日本建築学会環境系論文集   71 ( 605 )   15 - 22   2006年

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    記述言語:日本語   出版者・発行元:日本建築学会  

    Iterative solvers are widely used for solving large systems of linear equations, and applied to the systems obtained with the acoustical FEM and BEM. In the present paper, the convergence behavior of the Krylov subspace iterative solvers towards the systems with the 3-D acoustical fast muftipole BEM, an efficient BEM based on the fast multipole algorithm, is investigated through numerical experiments. The convergence behavior of solvers is much affected by the formulation of the BEM (basic form (BF), normal derivative form (NDF) and Burton-Miller formulation), the complexity of the shape of the problem, and the sound absorption property of the boundaries. In BiCG-like solvers, GPBiCG and BiCGStab2 converge more stable than others, and these solvers are useful when solving interior problems using BF. When solving exterior problems with greatly complex shape using Burton-Miller formulation, all solvers hardly converge without preconditioning, whereas the convergence behavior is much improved with ILU-type preconditioning. In these cases GMRes is the fastest, whereas CGS is one of the good choices, when taken into account the difficulty of determining the timing of restart for GMRes. As for calculation for thin objects using NDF, much more rapid convergence is observed than ordinary interior/exterior problems, especially using BiCG-like solvers.

    DOI: 10.3130/aije.71.15_3

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    その他リンク: http://hdl.handle.net/10191/18374

  • 反変速度-圧力交互時間進行による一般曲線座標系FDTD音場解析手法

    大嶋 拓也

    日本建築学会環境系論文集   71 ( 599 )   9 - 15   2006年

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    記述言語:日本語   出版者・発行元:日本建築学会  

    Finite-difference time-domain (FDTD) acoustic simulation technique in generalized curvilinear coordinates using contravariant velocity and pressure as variables for two-step leapfrog time marching scheme is presented. The technique excels the conventional generalized curvilinear technique using contravariant velocity, covariant velocity and pressure as variables for three-step time marching, especially in that normal acoustic impedance boundary conditions which are indispensable in practical application are also presented. Validation of the technique through comparison against orthogonal FDTD with staircasing applied in irregularly-shaped sound field shows suppressions of phase error in initial time marching stage and diffusion from staircased boundaries.

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  • 部分スパン数値流体解析結果を利用した柱状物体からの空力音推定法 : 推定手法の構築および実証実験

    大嶋 拓也, 寺尾 道仁, 関根 秀久

    日本建築学会環境系論文集   70 ( 598 )   15 - 22   2005年

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    記述言語:日本語   出版者・発行元:日本建築学会  

    Estimation technique of aerodynamic sound radiation from a cylindrical body using results of partial-span CFD computation is presented. The technique replaces the calculation of Curie equation in Lighthill-Curle computational aeroacoustics technique, and is based on Morse-Ingard's and Goldstein's theory and coherence model function. The validation of the model function and the technique through wind-tunnel experiment results 1) measured coherence between surface fluid forces on the body surface shows good agreement with the model function, and 2) reasonable agreement is obtained between measured SPL at a receiving point and estimated SPL using the technique.

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  • Numerical study on correlation between aeroacoustic sources on uniformly aligned cylindrical bodies

    Oshima Takuya, Sakuma Tetsuya, Hirate Kotaroh

    Acoustical science and technology   24 ( 3 )   139 - 141   2003年5月

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    記述言語:英語   出版者・発行元:一般社団法人 日本音響学会  

    DOI: 10.1250/ast.24.139

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    その他リンク: http://dl.ndl.go.jp/info:ndljp/pid/10572443

  • An estimation method of total aeroacoustic noise from a cylindrical body by a partial-span computation

    Oshima Takuya, Sakuma Tetsuya, Hirate Kotaroh

    Acoustical science and technology   24 ( 2 )   100 - 102   2003年3月

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    記述言語:英語   出版者・発行元:一般社団法人 日本音響学会  

    DOI: 10.1250/ast.24.100

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    その他リンク: http://dl.ndl.go.jp/info:ndljp/pid/10572430

  • Numerical vibro-acoustic analysis of sound insulation perfornmance of wall members based on a 3-D transnsmission model with a membrane/plate

    Sakuma Tetsuya, Oshima Takuya

    Acoustical science and technology   22 ( 5 )   367 - 369   2001年9月

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    記述言語:英語   出版者・発行元:一般社団法人 日本音響学会  

    DOI: 10.1250/ast.22.367

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    その他リンク: http://dl.ndl.go.jp/info:ndljp/pid/10572254

  • 建築付帯物から発生する空力騒音の数値予測に関する基礎的研究

    大嶋 拓也, 今野 雅, 佐久間 哲哉, 平手 小太郎

    日本建築学会計画系論文集   65 ( 532 )   7 - 13   2000年

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    記述言語:日本語   出版者・発行元:日本建築学会  

    Quantitative methods for predicting aeroacoustic noise radiated from balusters of buildings have been expected as a tool for its effective reduction. We applied a numerical method of solution based on Lighthill-Curle equation. As a basic step, we attempted to predict characteristics of the sound radiated by airflow around a row of square cylinders at Reynolds number 1000 by 2-dimensional analysis. We also made a comparison of solutions of an isolated cylinder wake flow at the same Reynolds number by 2- and 3-dimensional analyses, as a preparation for further improvement of the method.

    DOI: 10.3130/aija.65.7_3

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    その他リンク: http://hdl.handle.net/10191/18380

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書籍等出版物

  • Computational Simulation in Architectural and Environmental Acoustics: Methods and Applications of Wave-Based Computation

    Tetsuya Sakuma, Shinichi Sakamoto, Toru Otsuru, Takuya Oshima( 担当: 共著 ,  範囲: 5.1, 5.3, 7.1)

    Springer  2014年8月 

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  • はじめての音響数値シミュレーションプログラミングガイド

    日本建築学会, 大嶋 拓也, 石塚 崇, 大久保 寛, 鈴木 久晴, 星 和磨

    コロナ社  2012年  ( ISBN:9784339008388

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    記述言語:日本語

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  • 音環境の数値シミュレーション―波動音響解析の技法と応用

    日本建築学会

    日本建築学会  2011年10月  ( ISBN:4818927074

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    総ページ数:291  

    ASIN

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MISC

  • Three-dimensional Numerical Acoustic Simulation with Background Flow Using Method of Characteristics

    A. Fukuda, K. Okubo, T. Oshima, T. Tsuchiya, M. Kanamori

    38th Symp. Ultrason. Electron   no.2P2‐9   2017年10月

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  • 環境・建築分野の実務における数値解析の現状と課題

    大嶋 拓也

    騒音制御 = The journal of the INCE of Japan   41 ( 1 )   2 - 7   2017年2月

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    記述言語:日本語   出版者・発行元:日本騒音制御工学会  

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  • 屋外騒音伝搬の波動解析

    大嶋 拓也, 平栗 靖浩, 星 和磨

    音響学会誌   73 ( 6 )   364 - 369   2017年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本音響学会  

    DOI: 10.20697/jasj.73.6_364

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  • Multi-dimensional numerical simulation of sound propagation with background flow using constrained interpolation profile method

    A. Fukuda, K. Okubo, T. Oshima, T. Tsuchiya, M. Kanamori

    J. Acoust. Soc. Am   140 ( 4 )   3250 - 3250   2016年11月

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  • A fundamental study on numerical analysis of extremely low frequency sound waves induced by tsunami,

    K. Kawashima, K. Okubo, T. Oshima, N. Takeuchi

    32nd Int. Acoust. Imaging Symp   2013年4月

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  • ParaView導入ガイド(やさしい解説)

    大嶋 拓也

    音響学会誌   69 ( 8 )   407 - 412   2013年

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    記述言語:日本語   出版者・発行元:一般社団法人 日本音響学会  

    DOI: 10.20697/jasj.69.8_407

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  • オープンソース・ソフトウエアを活用した実在市街地環境複合解析(<特集>オープンソースの大きな流れ)

    大嶋 拓也, 今野 雅, 平栗 靖浩, Takuya OSHIMA, Masashi IMANO, Yasuhiro HIRAGURI, 新潟大学工学部, 東京大学大学院工学系研究科, 徳山工業高等専門学校土木建築工学科, Faculty of Engineering, Niigata University, Graduate School of, Engineering The, University of Tokyo, Department of Civil Engineering, Architecture Tokuyama College of Technology

    ながれ : 日本流体力学会誌 = Journal of Japan Society of Fluid Mechanics   31 ( 3 )   293 - 300   2012年6月

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    記述言語:日本語   出版者・発行元:日本流体力学会  

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  • 実在街区における風解析と波動伝搬解析の連成予測

    大嶋 拓也, 今野 雅

    騒音制御   36 ( 3 )   218 - 224   2012年6月

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    記述言語:日本語   出版者・発行元:日本騒音制御工学会  

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  • 環境工学委員会 : 今ここまで見える環境工学

    井上 隆, 永田 明寛, 富永 禎秀, 鈴木 広隆, 大嶋 拓也, 一ノ瀬 雅之

    建築雑誌   125 ( 1608 )   28 - 31   2010年9月

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    記述言語:日本語   出版者・発行元:一般社団法人日本建築学会  

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  • オープンソースCAE : 展開と諸課題

    坂本 雄三, 柴田 良一, 今野 雅, 大嶋 拓也

    建築雑誌   124 ( 1594 )   38 - 39   2009年9月

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    記述言語:日本語   出版者・発行元:一般社団法人日本建築学会  

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  • 部分スパン数値流体解析結果を利用した柱状物体からの空力音推定法 : 推定手法の構築および実証実験(2008年日本建築学会奨励賞)

    大嶋 拓也

    建築雑誌   123 ( 1579 )   2008年8月

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    記述言語:日本語   出版者・発行元:一般社団法人日本建築学会  

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  • Experimental and numerical study of spatial coherence of surface pressure on a square cylinder for numerical aerodynamic noise prediction

    Proc. Internoise 2003 (Jeju)   N355, pp. 1737-1744   2003年

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  • Numerical study on correlation between aeroacoustic sources on uniformly lined cylindrical bodies placed in a statistically uniform flow

    Proceedings of Forum Acusticum Sevilla 2002   Num-Gen-006   2002年

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  • Numerical study on sound insulation performance of membranes with additional weights

    Proc. 17th International Congress on Acoustics (Rome)   6A.07.05   2001年

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  • Numerical study on effect of inflow wind characteristics to generation of aeroacoustic noises from balusters of buildings

    Proc. Internoise 2001 (Hague)   No. 511   2001年

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  • Numerical prediction of aeroacoustic noise radiated from balusters of buildings with large eddy simulation

    Proceedings inter. noise 2000   4   2359 - 2362   2000年

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  • Numerical study of aeroacoustic noise radiated from baluster for buildings-analysis of flow around balusters with turbulence model

    Summaries of technical papers of annual meeting Architectural Institute of Japan 2000   D-1   155 - 156   2000年

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  • Numerical study of aeroacoustic noise radiated from baluster for buildings -comparison of 2-dimentional and 3-dimentional analysis of cylinder wake flow.

    D-1   257 - 258   1999年

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  • Numerical Study of acroacoustic noise radiated from bulster for building

    ( D-1 )   159   1998年

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  • 数値計算による建築付帯物から発生する空力音の予測に関する研究

    東京大学大学院工学系研究科建築学専攻修士論文梗概集   1   1998年

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  • An application of domain division method in numerical Sound field analysis-the introduction of virtual boundary condition

    ( D-1 )   1   1995年

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講演・口頭発表等

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Works(作品等)

  • 高速多重極境界要素法に基づいた商用音響解析ソフトウエアの開発

    2004年

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受賞

  • 第18回空気調和・衛生工学会功績賞

    2021年5月   公益社団法人空気調和・衛生工学会   次世代型CFDパーツの開発およびBIMによる空調設備設計統合手法に関する調査研究

    公益社団法人空気調和・衛生工学会換気設備委員会BIM・CFDパーツ開発応用小委員会

     詳細を見る

  • 空気調和・衛生工学会第14回功績賞

    2017年5月   空気調和・衛生工学会   建築環境設計における空調吹出し口のCFDパーツ化およびBIMとの連携手法の提案

    空気調和, 衛生工学会, CFDパーツ化とBIM応用小委員会

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  • 日本建築学会奨励賞

    2008年4月   日本建築学会   部分スパン数値流体解析結果を利用した柱状物体からの空力音推定法 -推定手法の構築および実証実験-

    大嶋 拓也

     詳細を見る

  • 第23回粟屋潔学術奨励賞

    2006年3月   日本音響学会   角柱列状空力音源の物体間相関に対する物体間隔の影響

    大嶋 拓也

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共同研究・競争的資金等の研究

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    -
    2012年
    機関名:新潟大学

  • 建築設計製図IV

    2008年
    -
    現在
    機関名:新潟大学

  • 建築設計製図I

    2008年
    -
    現在
    機関名:新潟大学

  • 建築設計製図II

    2008年
    -
    現在
    機関名:新潟大学

  • 建築設計製図III

    2008年
    -
    現在
    機関名:新潟大学

  • 建築数理工学

    2008年
    -
    2012年
    機関名:新潟大学

  • 建築環境制御学演習

    2007年
    -
    2018年
    機関名:新潟大学

  • 建築環境工学演習

    2007年
    -
    2018年
    機関名:新潟大学

▶ 全件表示

教育活動に関する受賞

  • 計算力学技術者認定事業公認CAE技能講習会認定

    2011年4月   日本機械学会