Updated on 2024/05/14

写真a

 
TOYODA,Masahiro
 
Organization
Faculty of Environmental and Urban Engineering Professor
Title
Professor
Contact information
メールアドレス
Homepage
https://wps.itc.kansai-u.ac.jp/acoust/
External link

Degree

  • Dr. Eng. ( 2006.3 )

  • M. Eng. ( 2003.3 )

Research Areas

  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention) / Architectural environment and building equipment

Education

  • Kyoto University   Graduate School, Division of Engineering   Dept. of Urban and Environmental Eng.

    - 2006

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  • Kyoto University   Graduate School, Division of Engineering   Dept. of Architecture

    - 2003

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  • Kyoto University   Faculty of Engineering   Dept. of Architecture, Faculty of Eng.

    - 2001

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Research History

  • Dept. of Architecture, Faculty of Environmental and Urban Eng., Kansai University/Professor

    2021.4

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  • School of Mechanical and Manufacturing Eng., The University of New South Wales/Visiting Fellow

    2017.4 - 2018.3

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  • Dept. of Architecture, Faculty of Environmental and Urban Eng., Kansai University/Associate Professor

    2014.4 - 2021.3

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  • Dept. of Architecture, Faculty of Environmental and Urban Eng., Kansai University/Assistant Professor

    2011.4 - 2014.3

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  • Kyoto University Pioneering Research Unit for Next Generation/Assistant Professor

    2008.4 - 2011.3

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  • Kyoto University Pioneering Research Unit for Next Generation/Assistant Professor

    2007.4 - 2008.3

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  • Kyoto University Pioneering Research Unit for Next Generation/Assistant Professor

    2006.12 - 2007.3

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  • Advanced Telecommunications Research Institute International/Research Associate

    2006.9 - 2007.3

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  • Dept. of Urban and Environmental Eng., Graduate School of Eng., Kyoto University/Research Associate

    2006.4 - 2006.12

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Professional Memberships

Committee Memberships

  •   堺市廃棄物処理施設及び汚染土壌処理施設に係る専門委員  

    2024.6 - Present   

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    Committee type：Municipal

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  • 日本音響学会   建築音響研究委員会運営委員  

    2024.4 - Present   

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    Committee type：Academic society

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  • 日本音響学会   第196回技術講習会「ゼロから始める波動音響シミュレーション ～PythonでFDTD」講師  

    2023.6   

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    Committee type：Academic society

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  • 日本音響学会   理事  

    2023.5 - Present   

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    Committee type：Academic society

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  • 日本建築学会   音環境運営委員会委員  

    2023.4 - Present   

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    Committee type：Academic society

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  • 日本建築学会   音環境運営委員会数値解析小委員会重量床衝撃音の数値解析検討WG委員  

    2023.4 - Present   

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    Committee type：Academic society

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  • 日本建築学会   近畿支部音環境部会主査  

    2023.4 - Present   

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    Committee type：Academic society

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  • 日本音響学会   第193回技術講習会「ゼロから始める波動音響シミュレーション ～PythonでFDTD」講師  

    2022.12   

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    Committee type：Academic society

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  • 日本音響学会   第23回サマーセミナー講師  

    2022.9   

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  • 日本建築学会   論文集委員会委員  

    2022.6 - 2024.5   

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    Committee type：Academic society

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  • 日本音響学会   建築音響研究委員会委員長  

    2022.4 - 2024.3   

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    Committee type：Academic society

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  •   Internoise 2023 Organizaing Committee  

    2021.6 - 2023.8   

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    Committee type：Academic society

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  • 日本建築学会   司法支援建築会議会員  

    2021.3 - Present   

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    Committee type：Academic society

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  • 日本建築学会   音環境の数値シミュレーション第2版刊行小委員会幹事  

    2020.4 - 2022.3   

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    Committee type：Academic society

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  • 日本建築学会   音環境運営委員会幹事  

    2019.4 - 2021.3   

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    Committee type：Academic society

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  • 日本建築学会   音環境運営委員会音響数値解析小委員会委員  

    2017.4 - Present   

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    Committee type：Academic society

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  • 日本音響学会   関西支部若手研究者交流研究発表会実行委員  

    2017.4 - 2018.3   

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    Committee type：Academic society

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  • 日本音響学会   第18回サマーセミナー「音響学の基礎と最近のトピックス」講師  

    2016.9   

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    Committee type：Academic society

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  •   豊中市大規模小売店舗立地審議会委員  

    2016.6 - 2017.3   

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    Committee type：Municipal

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  • 日本建築総合試験所   音光環境性能評価委員会  

    2016.4 - Present   

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    Committee type：Academic society

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  • 日本音響学会   関西支部若手研究者交流研究発表会実行委員長  

    2016.4 - 2017.3   

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    Committee type：Academic society

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  • 日本音響学会   第142回技術講習会「音響・振動におけるFDTD法の基礎と応用」講師  

    2015.10   

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    Committee type：Academic society

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  • 日本音響学会   代議員（評議員）  

    2015.5 - 2023.5   

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    Committee type：Academic society

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  • 日本建築学会   音環境運営委員会音響数値解析小委員会幹事  

    2015.4 - 2017.3   

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    Committee type：Academic society

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  •   大阪府大規模小売店舗立地審議会委員  

    2014.12 - 2016.11   

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    Committee type：Municipal

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  • 日本音響学会   建築音響研究委員会運営員  

    2014.5 - 2022.3   

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    Committee type：Academic society

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  •   船内騒音測定技術者講習会運営委員会副委員長  

    2014.4 - Present   

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    Committee type：Government

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  • 日本音響学会   第128回技術講習会「音響・振動におけるFDTD法の基礎と応用」講師  

    2013.10   

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    Committee type：Academic society

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  • 日本音響学会   サイエンスシリーズ編集委員会委員  

    2013.8 - 2016.4   

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    Committee type：Academic society

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  •   堺市大規模小売店舗立地審議会委員  

    2012.4 - 2017.3   

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    Committee type：Municipal

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  •   八尾市大規模小売店舗立地審議会委員  

    2012.4 - 2016.3   

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    Committee type：Municipal

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  • 日本音響学会   建築音響研究委員会副委員長  

    2012.4 - 2014.4   

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    Committee type：Academic society

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  • 日本音響学会   関西支部庶務幹事  

    2012.4 - 2014.4   

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    Committee type：Academic society

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  • 日本音響学会   第116回技術講習会「音響・振動におけるFDTD法の基礎と応用」講師  

    2011.10   

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    Committee type：Academic society

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  •   Internoise 2011 Local Committee  

    2011.5 - 2011.9   

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    Committee type：Academic society

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  •   5th International Building Physics Conference Organizing Committee  

    2010.8 - 2012.5   

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    Committee type：Academic society

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  • 日本音響学会   関西支部若手研究者交流研究発表会実行委員会委員  

    2010.5 - 2016.3   

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    Committee type：Academic society

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  • 日本音響学会   建築音響研究委員会幹事  

    2010.5 - 2012.4   

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    Committee type：Academic society

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  • 日本音響学会   事業委員会委員  

    2009.8 - 2013.8   

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    Committee type：Academic society

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  • 日本音響学会   編集委員会（会誌部門）委員  

    2009.6 - 2013.6   

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    Committee type：Academic society

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  • 日本建築学会   音環境運営委員会音響数値解析小委員会委員  

    2009.4 - 2015.3   

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    Committee type：Academic society

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  • 日本建築学会   音環境の数値シミュレーション刊行小委員会委員  

    2009.4 - 2011.3   

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    Committee type：Academic society

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  • 日本音響学会   建築音響研究委員会運営委員  

    2008.9 - 2010.4   

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  • 日本建築学会   近畿支部環境工学部会幹事  

    2008.4 - 2010.3   

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    Committee type：Academic society

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Papers

  • Computationally efficient transparent sound source for the finite-difference time-domain method Reviewed

    Masahiro Toyoda, Kohei Yatabe

    Acoustical Science and Technology   44 ( 5 )   371 - 382   2023.9

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.44.371

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  • Cause for an unexpected absorption peak of periodically aligned blocks with holes Reviewed

    Masahiro Toyoda, Kimiko Nakagawa, Hideo Miyazaki

    Acoustical Science and Technology   44 ( 4 )   340 - 343   2023.7

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.44.340

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  • Acoustic Performance of a Metascreen-Based Coating for Maritime Applications Reviewed

    Gyani Shankar Sharma, Masahiro Toyoda, Alex Skvortsov, Ian MacGillivray, Nicole Kessissoglou

    Journal of Vibration and Acoustics   144 ( 3 )   031015   2022.2

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    Publishing type：Research paper (scientific journal)   Publisher：ASME International  

    Abstract

    Time- and frequency-domain numerical models are developed to investigate the acoustic performance of metascreen-based coatings for maritime applications. The coating designs are composed of periodic air-filled cavities embedded in a soft elastic medium, which is attached to a hard backing and submerged in water. Numerical results for an acoustic coating with cylindrical cavities are favorably compared with analytical and experimental results from the literature. Frequencies associated with peak sound absorption as a function of the geometric parameters of the cavities and material properties of the host medium are predicted. Variation in the cavity dimensions that modifies the cylindrical-shaped cavities to flat disks or thin needles is modeled. Results reveal that high sound absorption occurs when either the diameter or length of the cavities is reduced. Physical mechanisms governing sound absorption for the various cavity designs are described.

    DOI： 10.1115/1.4053543

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  • Filter and correction for a hybrid sound field analysis of geometrical and wave-based acoustics Reviewed

    Masahiro Toyoda, Yuta Sakayoshi

    Acoustical Science and Technology   42 ( 4 )   170 - 180   2021.7

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.42.170

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  • Prediction of bandgap characteristics by sonic crystals Reviewed

    Ao Yamada, Masahiro Toyoda

    Acoustical Science and Technology   41 ( 6 )   815 - 818   2020.11

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    Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.41.815

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  • Analysis of the oblique incidence of periodic structures in a sound field by the finite-difference time-domain method Reviewed

    Miho Takemura, Masahiro Toyoda

    Applied Acoustics   167   107357   2020.10

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.apacoust.2020.107357

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  • Application of paper folding technique to three-dimensional space sound absorber with permeable membrane: Case studies of trial productions Reviewed

    Kimihiro Sakagami, Takeshi Okuzono, Hirotaka Suzuki, Nao Koyanagi, Masahiro Toyoda

    The International Journal of Acoustics and Vibration   25 ( 2 )   243 - 247   2020.6

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    Publishing type：Research paper (scientific journal)   Publisher：International Institute of Acoustics and Vibration (IIAV)  

    The authors propose a space sound absorber made of a permeable membrane (PM), including woven or non-woven fabrics in three-dimensional shapes, e.g., cylinder, rectangle, etc. The proposed absorbers are examined by experimental measurements and boundary element analyses, and it is found that they can be effectively used especially for middle and high frequencies. In order to develop these absorbers for wider applications, it would be desirable to give them additional values and functions, particularly to elaborate on their design. Supposing that they could also be used for lighting equipment, such as lampshades as one of the applications, pilot studies on pseudo-cylindrical, and pseudo-spherical PM space absorbers with uneven surfaces produced by paper-folding (origami technique) are carried out. The pseudo-cylindrical concave curves (PCCC) shell shape has been proven as a suitable form for a lampshade, and the pseudo-spherical concave curves (PSCC) shell shape is an application of PCCC. In this paper, PCCC and PSCC shell shapes are applied to three-dimensional PM space absorbers, and trials are conducted using PMs selected by flow resistance measurements and preliminary simulations. The sound absorptivity of the specimens is measured in a reverberation chamber, and their absorptivity is 0.6 (PCCC case) and 0.4 (PSCC case) at mid-high frequencies.

    DOI： 10.20855/ijav.2020.25.21657

    Web of Science

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  • Predicted Absorption Performance of Cylindrical and Rectangular Permeable Membrane Space Sound Absorbers Using the Three-Dimensional Boundary Element Method Reviewed

    Masahiro Toyoda, Kota Funahashi, Takeshi Okuzono, Kimihiro Sakagami

    Sustainability   11 ( 9 )   2714   2019.5

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

    Three-dimensional, permeable membrane space sound absorbers have been proposed as practical and economical alternatives to three-dimensional, microperforated panel space sound absorbers. Previously, the sound absorption characteristics of a three-dimensional, permeable membrane space sound absorber were predicted using the two-dimensional boundary element method, but the prediction accuracy was impractical. Herein, a more accurate prediction method is proposed using the three-dimensional boundary element method. In the three-dimensional analysis, incident waves from the elevation angle direction and reflected waves from the floor are considered, using the mirror image. In addition, the dissipated energy ratio is calculated based on the sound absorption of a surface with a unit sound absorption power. To validate the three-dimensional numerical method, and to estimate the improvement in prediction accuracy, the results are compared with those of the measurements and two-dimensional analysis. For cylindrical and rectangular space sound absorbers, three-dimensional analysis provides a significantly improved prediction accuracy for any shape and membrane sample that is suitable for practical use.

    DOI： 10.3390/su11092714

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  • A Basic Study on a Rectangular Plane Space Sound Absorber Using Permeable Membranes Reviewed

    Sakagami, Okuzono, Somatomo, Funahashi, Toyoda

    Sustainability   11 ( 7 )   2185   2019.4

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    Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

    In this communication, the sound absorption characteristics of rectangular-shaped plane space sound absorbers without any backing structure using permeable membranes (PMs) are measured by reverberation room method. First, three types of PMs, in this study woven fabrics, are selected with different flow resistances and surface densities. They are prepared in the plane rectangular-shaped space absorbers of two different sizes. The measured results are discussed through comparison with the existing theoretical and measured results for absorbers of the other shapes or configurations. The present results and discussion demonstrate that the reverberation absorption coefficients of the proposed absorbers are low at low frequencies and converge to a moderately high value at high frequencies. Especially, ones with higher flow resistance than the air impedance converge to a value greater than 0.5, which is a theoretically estimated maximum absorption coefficient of infinite single-leaf PM. This is inferred to be attributed mainly to area effect. From these results the proposed absorbers can be used effectively despite of their very simple structure. Also it is found that the proposed absorber can offer higher sound absorption than permeable membrane absorbers of other shapes or configuration. Regarding the effect of the size, the absorbers of smaller size offer higher absorption coefficients regardless of material properties of the PMs used in the experiments.

    DOI： 10.3390/su11072185

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  • A Pilot Study on the Sound Absorption Characteristics of Chicken Feathers as an Alternative Sustainable Acoustical Material Reviewed

    Asniawaty Kusno, Kimihiro Sakagami, Takeshi Okuzono, Masahiro Toyoda, Toru Otsuru, Rosady Mulyadi, Kusno Kamil

    Sustainability   11 ( 5 )   1476   2019.3

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    Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

    This communication reports the results of a pilot study on the sound absorption characteristics of chicken feathers (CFs). Recently, demands for natural and sustainable materials have been extensively studied for acoustical purposes. CF has long been left wasted, however, they can be used for sound-absorbing purposes to improve acoustical environments as a sustainable and green acoustical material. In order to clarify their feasibility, samples of CF absorbers of various densities and thicknesses were prepared, and their sound absorption coefficients were measured by the standard impedance tube method. The measured results were also compared with those of conventional glass wools of the same densities and thicknesses. The results show that CFs have potentially good sound-absorption performance, which is similar to typical fibrous materials: increasing with frequency. Results of direct comparison with glass wool demonstrate that the absorption coefficients of CFs are comparable and, at some frequencies, somewhat higher than conventional glass wools in some cases. Additionally, the first step for searching a prediction method for the sound absorption performance of CFs, their flow resistivity was measured and a Delany–Bazley–Miki model was examined. However, the resultant flow resistivity was unexpectedly low, and the model gave only a much lower value than that measured. The reason for the discrepancies is the subject of a future study.

    DOI： 10.3390/su11051476

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  • Improved stability conditions for impedance boundaries in the finite-difference time-domain method Reviewed

    Masahiro Toyoda

    Acoustical Science and Technology   40 ( 2 )   148 - 150   2019.3

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.40.148

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  • Prediction of microperforated panel absorbers using the finite-difference time-domain method Reviewed

    Masahiro Toyoda, Daiki Eto

    Wave Motion   86   110 - 124   2019.3

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.wavemoti.2019.01.006

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  • Frequency-dependent absorption and transmission boundary for the finite-difference time-domain method Reviewed

    Masahiro Toyoda, Shoichiro Ishikawa

    Applied Acoustics   145   159 - 166   2019.2

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.apacoust.2018.09.025

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  • Basic study on relationship between airborne sound transmission and structure-borne sound radiation of a finite elastic plate Reviewed

    Katsutoshi Takahashi, Motoki Yairi, Takeshi Okuzono, Kimihiro Sakagami, Masahiro Toyoda

    Acoustical Science and Technology   40 ( 1 )   52 - 55   2019.1

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    Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.40.52

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  • Stability conditions for impedance boundaries in the finite-difference time-domain method Reviewed

    Masahiro Toyoda

    Acoustical Science and Technology   39 ( 5 )   359 - 361   2018.9

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.39.359

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  • Prediction of permeable thin absorbers using the finite-difference time-domain method Reviewed

    Masahiro Toyoda, Junya Motooka

    The Journal of the Acoustical Society of America   143 ( 5 )   2870 - 2877   2018.5

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of America (ASA)  

    Permeable thin materials can play a role similar to porous absorbents, providing high sound absorption at mid- and high-frequencies. In addition, since they can be made from various materials such as cotton, chemical fibers, and metal fibers, they can be hygienic, durable, and easy to recycle. Their absorption characteristics are often discussed with analytical approaches, and a few studies have even applied the boundary element method and the finite element method to predict the practical effects of permeable thin absorbers. However, to the best of the authors' knowledge, the finite-difference time-domain (FDTD) method has yet to be used. Herein a formulation to deal with a permeable thin absorber as a permeable boundary in the FDTD method is proposed and the stability conditions for a permeable boundary are derived considering the state transition equations. The proposed formulation is validated by comparing the numerical and analytical results, which agree well.

    DOI： 10.1121/1.5037708

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  • Numerical and experimental investigation on structure-borne sound transmission in multilayered concrete structures Reviewed

    T. Asakura, M. Toyoda, T. Miyajima

    Journal of Sound and Vibration   413   1 - 25   2018.1

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.jsv.2017.09.028

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  • Largeness and shape of sound images captured by sketch-drawing experiments: Effects of bandwidth and center frequency of broadband noise Reviewed

    Makoto Otani, Kouhei Yamazaki, Masahiro Toyoda, Masami Hashimoto, Mizue Kayama

    Acoustical Science and Technology   38 ( 3 )   154 - 160   2017.5

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    Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.38.154

    CiNii Books

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  • Relation between frequency bandwidth of broadband noise and largeness of sound image Reviewed

    Makoto Otani, Kouhei Yamazaki, Masahiro Toyoda, Masami Hashimoto, Mizue Kayama

    Acoustical Science and Technology   38 ( 1 )   35 - 37   2017.1

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    Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.38.35

    CiNii Books

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  • Improved sound absorption performance of three-dimensional MPP space sound absorbers by filling with porous materials Reviewed

    Masahiro Toyoda, Kimihiro Sakagami, Mitsuru Okano, Takeshi Okuzono, Emi Toyoda

    Applied Acoustics   116   311 - 316   2017.1

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.apacoust.2016.10.006

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  • 通気性膜を用いた立体型空間吸音体の吸音特性の3次元境界要素解析 Reviewed

    舟橋 康太, 豊田 政弘, 阪上 公博, 奥園 健

    日本音響学会誌   72 ( 7 )   383 - 385   2016.7

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

    CiNii Books

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  • Effect of Urethane Foam Cushioning on Structure-Borne Sound Transfer by a Slab with Panel Flooring Reviewed

    RuiLin Mu, Masahiro Toyoda, Daiji Takahashi

    Archives of Acoustics   41 ( 1 )   99 - 106   2016.3

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    Publishing type：Research paper (scientific journal)   Publisher：Walter de Gruyter GmbH  

    Abstract

    Urethane foam mattresses are commonly used as cushioning when placing panel flooring on the floor slab of a building. Urethane foam consists of elastic fibres with pores. Both elements can affect the performance of the insulation against impact sounds. However, these effects have not yet been detailed, and they may change if the material properties or constitution of the fibres and pores in the cushioning change. In this paper, we propose an analytical model for use in evaluating the performance of insulation against floor impact sound. This model was used to examine the contribution of the pores versus the elastic fibres to wave transmissions from the flooring surface to the slab. The results reveal that the constitution of the foam (either open or closed cells of pores) and the thickness and hardness of the cushion layer strongly affect the sound insulation performance of the floor.

    DOI： 10.1515/aoa-2016-0010

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    Other Link： https://www.degruyter.com/view/j/aoa.2016.41.issue-1/aoa-2016-0010/aoa-2016-0010.pdf

  • 和梵鐘のシミュレーションと実験の音色比較 Reviewed

    佐藤雅弘, 豊田政弘, 会田哲夫, 飴井賢治

    日本音響学会誌   71 ( 12 )   661 - 664   2015.12

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    DOI： 10.20697/jasj.71.12_661

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  • Numerical analyses of the sound absorption of cylindrical microperforated panel space absorbers with cores Reviewed

    Masahiro Toyoda, Shota Fujita, Kimihiro Sakagami

    The Journal of the Acoustical Society of America   138 ( 6 )   3531 - 3538   2015.12

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of America (ASA)  

    Microperforated panels (MPPs) are next-generation absorption materials because they can provide wideband sound absorption without fibrous materials and can be composed of diverse materials to meet global environmental demands. The fundamental absorbing mechanism is Helmholtz-resonance absorption due to perforations and an air cavity. MPPs are typically backed by rigid flat walls, but to reduce the restrictions on the MPP absorber properties, one of the authors has proposed MPP space sound absorbers without backing structures, including three-dimensional cylindrical microperforated panel space absorbers (CMSAs). Advantages of MPPs without backing structures are design flexibility and ease of use. Besides, the absorption characteristics of a CMSA with a core, which has a rigid cylindrical core inside the CMSA, have been experimentally tested, but a method to predict the absorption characteristics is necessary to design CMSAs with cores. Herein the two-dimensional combined Helmholtz integral formulation method is employed, and its prediction accuracy is evaluated by comparing the measured and predicted absorption characteristics of a CMSA with a core. Furthermore, a parametric study with regard to the core size is carried out to investigate the transition of the absorbing mechanism.

    DOI： 10.1121/1.4936944

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  • 通気性単一膜を用いた矩形平面状空間吸音体の残響室法吸音率測定 Reviewed

    杣友祐, 奥園健, 舟橋康太, 阪上公博, 豊田政弘

    日本音響学会誌   71 ( 6 )   276 - 277   2015.6

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    DOI： 10.20697/jasj.71.6_276

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  • Finite-difference time-domain analysis of the vibration characteristics of a beam-plate structure using a dimension-reduced model Reviewed

    T. Asakura, T. Ishizuka, T. Miyajima, M. Toyoda

    Applied Acoustics   92   75 - 85   2015.5

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.apacoust.2014.12.011

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  • An experimental study on the absorption characteristics of a three-dimensional permeable membrane space sound absorber Reviewed

    Kimihiro Sakagami, Kota Funahashi, Yu Somatomo, Takeshi Okuzono, Chinami Nishikawa, Masahiro Toyoda

    Noise Control Engineering Journal   63 ( 3 )   300 - 307   2015.5

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    Publishing type：Research paper (scientific journal)   Publisher：Institute of Noise Control Engineering (INCE)  

    DOI： 10.3397/1/376327

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  • 通気性膜を用いた立体型空間吸音体の吸音特性に関する基礎的研究 Reviewed

    舟橋康太, 杣友祐, 西川智菜美, 阪上公博, 奥園健, 豊田政弘

    神戸大学大学院工学研究科・システム情報工学科紀要   6   17 - 23   2014.12

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    Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

    DOI： 10.5047/gseku.j.2014.002

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  • Prediction of low-frequency structure-borne sound in concrete structures using the finite-difference time-domain method Reviewed

    T. Asakura, T. Ishizuka, T. Miyajima, M. Toyoda, S. Sakamoto

    The Journal of the Acoustical Society of America   136 ( 3 )   1085 - 1100   2014.9

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    Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of America (ASA)  

    Due to limitations of computers, prediction of structure-borne sound remains difficult for large-scale problems. Herein a prediction method for low-frequency structure-borne sound transmissions on concrete structures using the finite-difference time-domain scheme is proposed. The target structure is modeled as a composition of multiple plate elements to reduce the dimensions of the simulated vibration field from three-dimensional discretization by solid elements to two-dimensional discretization. This scheme reduces both the calculation time and the amount of required memory. To validate the proposed method, the vibration characteristics using the numerical results of the proposed scheme are compared to those measured for a two-level concrete structure. Comparison of the measured and simulated results suggests that the proposed method can be used to simulate real-scale structures.

    DOI： 10.1121/1.4892784

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  • Numerical analyses of the sound absorption of three-dimensional MPP space sound absorbers Reviewed

    Masahiro Toyoda, Seiji Kobatake, Kimihiro Sakagami

    Applied Acoustics   79   69 - 74   2014.5

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.apacoust.2013.12.012

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  • Finite-difference time-domain analysis of structure-borne sound using a plate model based on the Kirchhoff-Love plate theory Reviewed

    Takumi Asakura, Takashi Ishizuka, Tohru Miyajima, Masahiro Toyoda, Shinichi Sakamoto

    Acoustical Science and Technology   35 ( 3 )   127 - 138   2014.5

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    Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.35.127

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  • Vibration analysis for framed structures using the finite-difference time-domain method based on the Bernoulli-Euler beam theory Reviewed

    Takumi Asakura, Takashi Ishizuka, Tohru Miyajima, Masahiro Toyoda, Shinichi Sakamoto

    Acoustical Science and Technology   35 ( 3 )   139 - 149   2014.5

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    Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.35.139

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  • Development of edge-effect suppression barriers Reviewed

    Yasuhito Kawai, Masahiro Toyoda

    Acoustical Science and Technology   35 ( 1 )   28 - 34   2014.1

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    Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.35.28

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  • Reduction of rain noise from Ethylene/TetraFluoroEthylene membrane structures Reviewed

    Masahiro Toyoda, Daiji Takahashi

    Applied Acoustics   74 ( 12 )   1309 - 1314   2013.12

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.apacoust.2013.05.013

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  • An experimental study on the sound absorption of three-dimensional MPP space sound absorbers: Rectangular MPP space sound absorber (RMSA) Reviewed

    K. Sakagami, M. Yairi, E. Toyoda, M. Toyoda

    Acoustics Australia   41 ( 2 )   156 - 159   2013.8

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Australian Acoustical Society  

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  • Numerical analysis of the influence of acoustic resonance in air cavities between windowpanes on sound transmission loss Reviewed

    Takafumi Shimizu, Masahiro Toyoda, Daiji Takahashi, Yasuhito Kawai

    Applied Acoustics   74 ( 8 )   1010 - 1017   2013.8

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.apacoust.2012.12.005

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  • Control of radiated sound from open end of duct Reviewed

    Sakuo Onishi, Masahiro Toyoda, Yasuhito Kawai

    Acoustical Science and Technology   34 ( 4 )   289 - 291   2013.7

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    Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.34.289

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  • Finite-difference time-domain analysis of structure-borne sound using a plate model Reviewed

    Takumi Asakura, Takashi Ishizuka, Tohru Miyajima, Masahiro Toyoda, Shinichi Sakamoto

    Acoustical Science and Technology   34 ( 1 )   48 - 51   2013.1

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    Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.34.48

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  • Effect of discretization in thickness direction on eigenfrequency analysis of a circular plate by the finite-difference time-domain method Reviewed

    Masahiro Toyoda, Daiji Takahashi, Yasuhito Kawai

    Acoustical Science and Technology   33 ( 6 )   394 - 397   2012.11

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.33.394

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  • Averaged material parameters and boundary conditions for the vibroacoustic finite-difference time-domain method with a nonuniform mesh Reviewed

    Masahiro Toyoda, Daiji Takahashi, Yasuhito Kawai

    Acoustical Science and Technology   33 ( 4 )   273 - 276   2012.7

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.33.273

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  • Finite-difference time-domain method for heterogeneous orthotropic media with damping Reviewed

    Masahiro Toyoda, Hideo Miyazaki, Yoshihide Shiba, Ami Tanaka, Daiji Takahashi

    Acoustical Science and Technology   33 ( 2 )   77 - 85   2012.3

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.33.77

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  • Improvement of sound insulation performance of double-panel structures by using damping materials Reviewed

    Ruilin Mu, Masahiro Toyoda, Daiji Takahashi

    Noise Control Engineering Journal   60 ( 4 )   473 - 480   2012.1

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    Publishing type：Research paper (scientific journal)   Publisher：Institute of Noise Control Engineering (INCE)  

    DOI： 10.3397/1.3701025

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  • Effect of a honeycomb on the sound absorption characteristics of panel-type absorbers Reviewed

    Masahiro Toyoda, Kimihiro Sakagami, Daiji Takahashi, Masayuki Morimoto

    Applied Acoustics   72 ( 12 )   943 - 948   2011.12

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.apacoust.2011.05.017

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  • Sound insulation characteristics of multi-layer structures with a microperforated panel Reviewed

    Rui Lin Mu, Masahiro Toyoda, Daiji Takahashi

    Applied Acoustics   72 ( 11 )   849 - 855   2011.11

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.apacoust.2011.05.009

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  • Improvement of sound insulation performance of multilayer windows by using microperforated panel Reviewed

    Rui Lin Mu, Masahiro Toyoda, Daiji Takahashi

    Acoustical Science and Technology   32 ( 2 )   79 - 81   2011.3

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    Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.32.79

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  • Relationship between Helmholtz-resonance absorption and panel-type absorption in finite flexible microperforated-panel absorbers Reviewed

    Masahiro Toyoda, Rui Lin Mu, Daiji Takahashi

    Applied Acoustics   71 ( 4 )   315 - 320   2010.4

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.apacoust.2009.10.007

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  • Prediction for architectural structure-borne sound by the finite-difference time-domain method Reviewed

    Masahiro Toyoda, Daiji Takahashi

    Acoustical Science and Technology   30 ( 4 )   265 - 276   2009.7

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of Japan  

    DOI： 10.1250/ast.30.265

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  • Study on echo suppression effect and coloration due to periodic-type diffusers Reviewed

    Masahiro Toyoda, Tomohiro Furukawa, Daiji Takahashi

    Applied Acoustics   70 ( 5 )   722 - 729   2009.5

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.apacoust.2008.09.002

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  • Sound transmission through a microperforated-panel structure with subdivided air cavities Reviewed

    Masahiro Toyoda, Daiji Takahashi

    The Journal of the Acoustical Society of America   124 ( 6 )   3594 - 3603   2008.12

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of America (ASA)  

    The absorption characteristics of a microperforated-panel (MPP) absorber have been widely investigated, and MPPs are recognized as a next-generation absorbing material due to their fiber-free nature and attractive appearance. Herein, further possibilities of MPPs are investigated theoretically from a sound transmission viewpoint. Employing an analytical model composed of a typical MPP and a back wall with an infinite extent, transmission loss through the structure is obtained. Although MPP structures generally have great potential for sound absorption, an improvement in the transmission loss at midfrequencies, which is important for architectural sound insulation, is not sufficient when using a backing cavity alone. Hence, to improve transmission loss at midfrequencies, an air-cavity-subdivision technique is applied to MPP structures. By subdividing the air cavity with partitions, each cell can create a local one-dimensional sound field as well as lead to a normal incidence into the apertures, which is the most effective condition for Helmholtz-type resonance absorption. Moreover, by providing the same motion as the back wall to the MPP, the sound-insulation performance can be further improved at midfrequencies.

    DOI： 10.1121/1.3001711

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  • Analysis and experiments of sound transmission through double window panels Reviewed

    Takafumi Shimizu, Toshiki Hiraoka, Masahiro Toyoda, Daiji Takahashi, Yasuhito Kawai

    Acoustical Science and Technology   29 ( 6 )   397 - 398   2008.11

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    DOI： 10.1250/ast.29.397

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  • 建物構造体の波動伝搬解析と音響放射ON

    高橋大弐, 豊田政弘, 加畑典利

    日本建築学会環境系論文集   73 ( 632 )   1155 - 1162   2008.10

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    Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Architectural Institute of Japan  

    DOI： 10.3130/aije.73.1155

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  • Effects of an air-layer-subdivision technique on the sound transmission through a single plate Reviewed

    Masahiro Toyoda, Hajime Kugo, Takafumi Shimizu, Daiji Takahashi

    The Journal of the Acoustical Society of America   123 ( 2 )   825 - 831   2008.2

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：Acoustical Society of America (ASA)  

    Many studies on the sound transmission through a single plate have been carried out theoretically and experimentally. The transmission-loss characteristics, in general, follow mass law. Therefore, increasing mass of a plate is a fundamental measure to improve the insulation performance. This method, however, has limitations and might not be a reasonable alternative in current standards. Furthermore, the transmission loss at the critical frequency of coincidence is deteriorated significantly even if the mass is rather large. In this paper, the effect of the air-layer-subdivision technique is studied in detail from the viewpoint of the sound transmission problem of a single plate. An analytical model of an infinite single plate with a subdivided layer is considered and the improvement of the transmission loss is estimated. The limitations of the technique are clarified with some parametric studies. In order to validate the predictions, an experiment was carried out. The transmission loss of a glass board with the air layer subdivided by acryl partitions was measured in the experiment. They were in good agreement with the theoretical ones near and above the coincidence.

    DOI： 10.1121/1.2821981

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  • Reduction of acoustic radiation by perforated board and honeycomb layer systems Reviewed

    Masahiro Toyoda, Mikito Tanaka, Daiji Takahashi

    Applied Acoustics   68 ( 1 )   71 - 85   2007.1

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    DOI： 10.1016/j.apacoust.2005.11.011

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  • 防振支持脚と周辺空気抜きが二重床の遮音効果に及ぼす影響についての理論的考察 Reviewed

    豊田政弘, 高橋大弐

    日本建築学会環境系論文集   71 ( 600 )   7 - 12   2006.2

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    Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Research paper (scientific journal)   Publisher：Architectural Institute of Japan  

    DOI： 10.3130/aije.71.7_1

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  • Effects of Air-Layer Subdivision: A New Method of Improving Sound Insulation Reviewed

    Masahiro Toyoda, Mikito Tanaka, Daiji Takahashi

    Building Acoustics   13 ( 1 )   49 - 59   2006.1

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：SAGE Publications  

    In the impact of floors, sound transmission through walls, and structure-borne sound transmission in buildings, there is a possibility of improving the insulation by restricting the air particle motion at the interface of the vibrating surface and the air. One of the practical ways for realizing this condition is by subdividing the air layer at the interface in the direction parallel to the radiating surface. This novel method for noise control has an attractive simplicity and a real practical benefit. In this paper, the mechanism, causing this effect, is discussed using analytical models of acoustic radiation and sound transmission. As a result of this investigation, it is seen that the effect of this method is characterized by reduction of acoustic radiation at low frequencies near and below the critical frequency of coincidence. The method is validated experimentally.

    DOI： 10.1260/135101006776324815

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  • Reduction of acoustic radiation by impedance control with a perforated absorber system Reviewed

    Masahiro Toyoda, Daiji Takahashi

    Journal of Sound and Vibration   286 ( 3 )   601 - 614   2005.9

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    DOI： 10.1016/j.jsv.2004.10.011

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  • Effects of Surface Diffusion of Reflectors on the Acoustic Power from the Stage Area Reviewed

    Masahiro Toyoda, Nagomi Toda, Daiji Takahashi

    Building Acoustics   11 ( 1 )   27 - 38   2004.3

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：SAGE Publications  

    When a sound source is located near a large plane-surface reflector, the total acoustic power radiated from the source including the reflection depends on the source position. Interference is the cause of this phenomenon, and the musical instruments for bass sound are particularly influenced. The surface diffusion treatment of the stage reflectors may be a solution for improving the problem. In this paper, from the viewpoint of acoustic power from the stage area to the audience area, the effect of surface diffusion of a stage rear-wall is examined by using an analytical model of 2 and 3-dimensional wave theory. As a result of some numerical examples, it is shown that a rear wall tilted more than right angles has a potential of improving the effect.

    DOI： 10.1260/1351010041217194

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Books

  • 建築音響物理学

    豊田政弘（ Role： Sole author）

    関西大学出版部  2023.12  （ ISBN:9784873547701 ）

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  • Computational simulation of sound environment : techniques and applications of wave‐based acoustics

    2021.12  （ ISBN:9784818926714 ）

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    Total pages：398p   Language：Japanese  

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  • 建築音響

    阪上公博, 豊田政弘, 佐藤逸人, 羽入敏樹, 尾本章

    コロナ社  2019.12  （ ISBN:9784339013634 ）

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    Total pages：x, 208p   Language：Japanese  

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  • 音響学入門ペディア

    日本音響学会

    コロナ社  2017.3  （ ISBN:9784339008951 ）

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    Total pages：200p   Language：Japanese  

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  • Acoustic keyword book

    Acoustical Society of Japan（ Role： Contributor）

    CORONA PUBLISHING CO., LTD.  2016.3  （ ISBN:9784339008807 ）

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  • Acoustic Field Visualization by the FDTD Method

    M. Toyoda, S. Sakamoto, T. Yokota, T. Asakura, Y. Nagatani, A. Hosokawa, T. Kimura, T. Aoyagi, M. Tabaru, H. Takemono, T. Tsuchiya, H. Tsuru（ Role： Edit）

    CORONA PUBLISHING CO., LTD.  2015.12  （ ISBN:9784339013344 ）

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  • Computational simulation in architectural and environmental acoustics : methods and applications of wave-based computation

    佐久間 哲哉, 坂本 慎一, 大鶴 徹

    Springer  2014.8  （ ISBN:9784431544531 ）

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    Total pages：xiv, 324 p.   Language：English  

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  • Computational Simulation of Sound Environment -Techniques and Applications of Wave-Based Acoustics-

    Architectural Institute of Japan（ Role： Contributor）

    Architectural Institute of Japan  2011.9  （ ISBN:9784818927070 ）

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MISC

  • 単板の遮音性能（質量則，コインシデンス効果）

    豊田政弘

    音響技術   203   8 - 13   2023.9

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  • 時間領域差分法による薄い吸音材やMPPの吸音・透過特性予測

    豊田政弘

    騒音制御   45 ( 2 )   79 - 84   2021.4

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  • Development of software for vibroacoustic analyses using the finite-difference time-domain method

    72 ( 11 )   697 - 702   2016.11

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  • 時間領域有限差分法を用いた汎用的な連成解析手法の開発

    豊田政弘

    日本音響学会誌   72 ( 11 )   697 - 702   2016.11

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  • Difference between real and numerically simulated sounds of a Japanese temple bell Reviewed

    M. Sato, M. Toyoda, T. Aida, K. Amei

    Journal of the Acoustical Society of Japan   71, (12), 661-664 ( 12 )   661 - 664   2015.12

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    Language：Japanese   Publisher：The Acoustical Society of Japan (ASJ)  

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  • 距離センサと音を用いた視覚障碍者支援デバイスの開発

    豊田政弘, 大谷真

    理工学と技術   22   37 - 40   2015.11

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  • 建てる前に知りたいリアルな響き

    豊田政弘, 安田洋介, 星和磨

    日本音響学会誌   71 ( 3 )   150 - 157   2015.3

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  • Foreword to measurement of normal incident sound absorption coefficient in impedance tubes

    YAMAGUCHI Michiyuki, TOYODA Masahiro

    The Journal of the Acoustical Society of Japan   68 ( 9 )   461 - 462   2012.9

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    Language：Japanese   Publisher：The Acoustical Society of Japan (ASJ)  

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  • 小特集「音響管による垂直入射吸音率測定」にあたって

    山口道征, 豊田政弘

    日本音響学会誌   68 ( 9 )   461 - 462   2012.9

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  • Prediction of floor impact noise considering vibroacoustic systems

    TOYODA Masahiro

    The Journal of the Acoustical Society of Japan   67 ( 7 )   290 - 295   2011.7

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  • 振動音響連成を考慮した床衝撃音の予測

    豊田政弘

    日本音響学会誌   67 ( 7 )   290 - 295   2011.7

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  • 床衝撃音の数値解析と可視化・可聴化

    豊田政弘

    音響技術   148   20 - 25   2009.12

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Presentations

  • 野口遵記念館の音響設計 －音楽ホールにおける拡散形状の組み合わせによる反射音の最適化－

    日根野翔太, 宮崎秀生, 豊田政弘, 岸永伸二

    秋季日本音響学会  2023.9 

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    Presentation type：Poster presentation  

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  • Development of a compact device for duct noises Invited

    Masahiro Toyoda

    Internoise 2023  2023.8 

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    Presentation type：Oral presentation (invited, special)  

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  • ハイブリッド音場解析を用いた立体音響可聴化技術

    豊田政弘, 大谷真

    日本音響学会建築音響研究会  2023.7 

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  • 時間領域有限差分法のためのトランスペアレント音源

    豊田政弘, 矢田部浩平

    日本音響学会建築音響研究会  2022.10 

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  • Development of microperforated panel sound barriers Invited

    Masahiro Toyoda

    24th International Congress on Acoustics  2022.10 

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  • Acoustical design of the Nishiwaki community hall "Orinas" - Study of the absorption characteristics of its interior perforated blocks

    Kimiko Nakagawa, Hideo Miyazaki, Masahiro Toyoda

    24th International Congress on Acoustics  2022.10 

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  • FDTD法の音源について

    豊田政弘, 矢田部浩平

    秋季日本音響学会  2022.9 

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  • 幾何音響と波動音響のハイブリッド解析

    坂吉佑太, 豊田政弘

    日本音響学会建築音響研究会  2022.8 

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  • MPP を用いたエッジ効果抑制型遮音壁

    豊田政弘

    日本音響学会建築音響研究会  2021.10 

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  • CLTの数値解析モデル構築に向けた振動特性および物性値に関する基礎的検討

    笠井祐輔, 豊田政弘, 田中学

    秋季日本音響学会  2021.9 

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  • 斜入射解析のためのFDTD法を用いた音場における分散性及び安定性の検討

    竹村美穗, 豊田政弘

    秋季日本音響学会  2020.9 

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  • FDTD法を用いた平面波斜入射音場の計算法

    竹村美穗, 豊田政弘

    日本建築学会大会（関東）  2020.9 

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  • ソニッククリスタルの透過特性予測式の提案

    山田蒼, 豊田政弘

    日本音響学会建築音響研究会  2020.6 

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  • ソニッククリスタルのバンドギャップ特性の予測

    山田蒼, 豊田政弘

    春季日本音響学会  2020.3 

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  • 水中での吸音・遮音を目的としたフォノニッククリスタル

    豊田政弘, シャンカーシャルマギアニ, ケシッソウグロウニコル

    日本音響学会建築音響研究会  2020.1 

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  • FDTD法による周期構造の斜入射音響透過損失の解析

    竹村美穗, 豊田政弘

    日本音響学会騒音振動研究会  2019.9 

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  • ソニッククリスタルを用いた遮音壁の開発

    竹村美穗, 豊田政弘

    春季日本音響学会  2019.3 

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  • 時間領域有限差分法を用いた微細穿孔板の吸音特性予測精度の改善

    豊田政弘

    日本建築学会近畿支部研究発表会  2018.6 

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  • Acoustic performance of a bubble meta-screen

    Gyani Shankar Sharma, Masahiro Toyoda, Nicole Kessissoglou

    Symposium on the Acoustics of Poro-Elastic Materials 2017  2017.12 

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  • 時間領域差分法による遮音解析 Invited

    朝倉巧, 宮島徹, 豊田政弘, 坂本慎一

    騒音制御工学会秋季発表会  2017.11 

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  • 有限弾性板による空気音透過と固体音放射の関係に関する基礎的研究 －単純な条件下における解析的検討－

    高橋克俊, 矢入幹記, 奥園健, 阪上公博, 豊田政弘

    秋季日本音響学会  2017.9 

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  • 折り紙行灯形通気性膜空間吸音体の吸音特性に関する基礎的研究

    阪上公博, 新間彬貴, 奥園健, 舟橋康太, 豊田政弘, 鈴木広隆, 小柳奈央

    日本音響学会建築音響研究会  2017.8 

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  • 無響環境における音像の大きさ及び形状の知覚に関する検討 Invited

    大谷真, 山﨑恒平, 豊田政弘

    日本音響学会建築音響研究会  2017.7 

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  • Chicken feather: an alternative of acoustical materials

    Asniawaty Kusno, Masahiro Toyoda, Kimihiro Sakagami, Takeshi Okuzono, Tohru Otsuru, Kusuno Kamil, Vovianty Masgode

    24th International Congress on Sound and Vibration  2017.7 

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  • 有限弾性板による空気音透過と固体音放射の関係に関する基礎的研究

    高橋克俊, 矢入幹記, 奥園健, 阪上公博, 豊田政弘

    日本建築学会近畿支部研究発表会  2017.6 

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  • 振動板に対向する音響管の放射音特性に関する研究

    宇津野秀夫, 豊田政弘, 松田志乃

    第２１回関西大学先端科学技術シンポジウム  2017.1 

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  • Finite-difference time-domain analysis of the vibration characteristics of building structures using a dimension-reduced model

    Takumi Asakura, Masahiro Toyoda, Tohru Miyajima

    ASA/ASJ 5th Joint Meeting  2016.11 

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  • Modeling and formulation of microperforated panels in the finite-difference time-domain method Invited

    Daiki Eto, Masahiro Toyoda, Yasuhito Kawai

    ASA/ASJ 5th Joint Meeting  2016.11 

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  • Three-dimensional space sound absorbers using microperforated panels Invited

    Kimihiro Sakagami, Masahiro Toyoda, Motoki Yairi, Takeshi Okuzono

    ASA/ASJ 5th Joint Meeting  2016.11 

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  • Study on coupled analysis for compact acoustic systems using finite-difference time-domain method based on Kirchhoff-Love plate theory and elastic wave

    Hayato Takimoto, Yoshinobu Kajikawa, Masahiro Toyoda, Takashi Miyakura

    ASA/ASJ 5th Joint Meeting  2016.11 

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  • エッジ効果抑制型遮音壁の性能向上の検討

    中島聡史, 河井康人, 豊田政弘

    秋季日本音響学会  2016.9 

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  • 時間領域差分法による低次要素を用いた振動解析

    朝倉巧, 豊田政弘, 宮島徹

    日本音響学会建築音響研究会  2016.7 

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  • 時間領域有限差分法によるMPPの対応について

    江東大貴, 豊田政弘, 河井康人

    日本音響学会建築音響研究会  2016.6 

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  • エッジ効果抑制型ベランダ手すりの騒音低減効果

    朝田有亮, 河井康人, 豊田政弘

    日本建築学会近畿支部研究発表会  2016.6 

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  • 帯域雑音の中心周波数と帯域幅が音像の大きさに与える影響

    山﨑恒平, 大谷真, 豊田政弘, 橋本昌巳, 香山瑞恵

    春季日本音響学会  2016.3 

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  • FDTD 法を用いたMPP の吸音特性予測について

    江東大貴, 豊田政弘, 河井康人

    春季日本音響学会  2016.3 

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  • 吸音パネルと空気層を組み合わせた吸音構造について

    中島聡史, 河井康人, 豊田政弘

    春季日本音響学会  2016.3 

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  • 幾何音響解析と波動音響解析を用いた大規模空間のハイブリッド音場解析手法に関する研究

    坂吉裕太, 豊田政弘, 河井康人

    春季日本音響学会  2016.3 

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  • 吸音処理を施したエッジ効果抑制型遮音壁

    平田武士, 河井康人, 豊田政弘

    日本音響学会関西支部若手研究者交流研究発表会  2015.12 

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  • 吸音パネルと空気層を組み合わせた吸音構造について

    中島聡史, 河井康人, 豊田政弘

    日本音響学会関西支部若手研究者交流研究発表会  2015.12 

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  • FDTD法を用いたMPPへの対応について

    江東大貴, 豊田政弘, 河井康人

    日本音響学会関西支部若手研究者交流研究発表会  2015.12 

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  • 幾何音響と波動音響のハイブリッドによる音場解析に関する研究

    坂吉裕太, 河井康人, 豊田政弘

    日本音響学会関西支部若手研究者交流研究発表会  2015.12 

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  • Three dimensional MPP and permeable membrane space sound absorbers: An overview

    Kimihiro Sakagami, Takeshi Okuzono, Motoki Yairi, Masahiro Toyoda

    WESPAC 2015  2015.12 

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  • 刺激の帯域幅とスケッチによる音源のイメージの関係に関する一検討

    山﨑恒平, 大谷真, 豊田政弘, 橋本昌巳, 香山瑞恵

    日本音響学会電気音響研究会  2015.12 

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  • 振動音響連成FDTD解析ソフトウェアの開発

    豊田政弘

    日本機会学会環境工学部門第一技術委員会「音・振動快適化技術と新しい評価法」研究会  2015.10 

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  • 多孔質材を充填した立体型MPP空間吸音体の吸音特性 －その１ 実験的検討－

    阪上公博, 岡野充, 奥園健, 豊田政弘, 豊田恵美

    秋季日本音響学会  2015.9 

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  • 最新遮音壁の効果について教えてください

    豊田政弘

    秋季日本音響学会ビギナーズセミナー  2015.9 

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  • 多孔質吸音材料の伝達関数法による音響特性測定の準ラウンドロビン・テスト

    大嶋拓也, 朝倉巧, 坂本慎一, 富来礼次, 安田洋介, 豊田政弘

    日本建築学会大会（関東）  2015.9 

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  • 多孔質材を充填した立体型MPP空間吸音体の吸音特性 －その２ 数値解析による検討－

    豊田政弘, 岡野充, 奥園健, 阪上公博

    秋季日本音響学会  2015.9 

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  • 吸音処理を施したエッジ効果抑制型遮音壁の性能

    平田武士, 河井康人, 豊田政弘

    秋季日本音響学会  2015.9 

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  • 波動数値解析の環境音響問題への応用に関する最近の動向 Invited

    坂本慎一, 富来礼次, 豊田政弘, 朝倉巧

    秋季日本音響学会  2015.9 

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  • 振動音響連成FDTD法の汎用ソフトウェア公開について

    豊田政弘

    秋季日本音響学会  2015.9 

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  • 微細穿孔板（MPP）を用いた空間吸音体 Invited

    阪上公博, 矢入幹記, 豊田政弘

    秋季日本騒音制御工学会  2015.9 

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  • 複層RC構造物における固体音解析

    朝倉巧, 宮島徹, 豊田政弘

    秋季日本音響学会  2015.9 

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  • 複層RC構造物を対象とした固体音解析

    朝倉巧, 宮島徹, 豊田政弘

    日本音響学会建築音響研究会  2015.8 

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  • 時間領域差分法による固体音解析

    朝倉巧, 宮島徹, 豊田政弘

    第２５回機会学会環境工学総合シンポジウム2015  2015.7 

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  • 残響時間に着目した完全拡散性の評価

    江東大貴, 豊田政弘, 河井康人

    日本建築学会近畿支部研究発表会  2015.6 

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  • 周波数帯域幅が音像の絶対的な幅に与える影響

    山﨑恒平, 大谷真, 豊田政弘, 橋本昌巳, 香山瑞恵

    春季日本音響学会  2015.3 

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  • 質点系境界条件を用いたFDTD法の安定性について

    石川翔一郎, 豊田政弘, 河井康人

    日本音響学会建築音響研究会  2015.1 

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  • 立体型MPP空間吸音体の吸音特性予測

    豊田政弘, 藤田翔太, 小畠星司, 阪上公博

    第１９回関西大学先端科学技術シンポジウム  2015.1 

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  • 小型音響機器における粘性を考慮するための弾性波ＦＤＴＤ法

    棚田達也, 豊田政弘, 梶川嘉延

    日本音響学会電気音響研究会  2015.1 

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  • 水平設置吸音層を用いたエッジ効果抑制型遮音壁

    平田武士, 河井康人, 豊田政弘

    日本音響学会関西支部若手研究者交流研究発表会  2014.12 

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  • 多層布・空気層吸音構造について

    河村紗貴子, 豊田政弘, 河井康人

    日本音響学会関西支部若手研究者交流研究発表会  2014.12 

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  • 和梵鐘の音色シミュレーション Invited

    佐藤雅弘, 豊田政弘, 会田哲夫, 飴井賢治

    日本音響学会電気音響研究会  2014.12 

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  • 携帯電話音声の聴き取りにくさにおよぼす建築空間の影響 －音声伝送性能評価指標による予測－

    矢入幹記, 豊田政弘

    日本音響学会建築音響研究会  2014.10 

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  • 多層布・空気層吸音構造について

    河村紗貴子, 豊田政弘, 河井康人

    秋季日本音響学会  2014.9 

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  • Study on acoustic FDTD analysis for compact acoustic systems

    Tatsuya Tanada, Yoshinobu Kajikawa, Masahiro Toyoda

    Forum Acusticum 2014  2014.9 

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  • 携帯電話音声の聴き取りにくさにおよぼす建築空間の影響とその予測 －評定尺度法を用いた実験－

    矢入幹記, 豊田政弘

    秋季日本音響学会  2014.9 

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  • FDTD法における質点系境界条件の安定性解析

    石川翔一郎, 豊田政弘, 河井康人

    秋季日本音響学会  2014.9 

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  • 周波数帯域幅が音像の大きさに与える影響

    山﨑恒平, 大谷真, 豊田政弘, 橋本昌巳, 香山瑞恵

    秋季日本音響学会  2014.9 

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  • Prediction method for absorption characteristics of three-dimensional MPP space absorbers Invited

    Masahiro Toyoda, Shota Fujita, Seiji Kobatake, Kimihiro Sakagami

    Forum Acusticum 2014  2014.9 

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  • 固体伝搬音を対象としたFDTD 解析 ―梁を伴うスラブ構造の振動解析―

    朝倉巧, 石塚崇, 宮島徹, 豊田政弘

    秋季日本音響学会  2014.9 

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  • コンクリート構造物における固体伝搬音を対象としたFDTD解析

    朝倉巧, 石塚崇, 宮島徹, 豊田政弘, 坂本慎一

    日本音響学会騒音振動研究会  2014.8 

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  • 通気性膜を用いた立体型空間吸音体の吸音特性に関する基礎的研究

    舟橋康太, 西川智菜美, 阪上公博, 豊田政弘

    日本音響学会建築音響研究会  2014.7 

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  • 固体伝搬音を対象としたFDTD解析 －梁構造の影響を考慮した検討－

    朝倉巧, 石塚崇, 宮島徹, 豊田政弘

    日本音響学会建築音響研究会  2014.6 

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  • 固体伝搬音を対象としたFDTD解析 －梁構造の影響を考慮した検討－

    朝倉巧, 石塚崇, 宮島徹, 豊田政弘

    春季日本音響学会  2014.3 

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  • 気中共鳴を利用した吸音構造の開発

    河井康人, 豊田政弘

    第１８回関西大学先端科学技術シンポジウム  2014.1 

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  • エッジ効果抑制型防音壁の実用化の検討

    小林正明, 松岡明彦, 鈴木信也, 河井康人, 豊田政弘

    日本音響学会建築音響研究会  2014.1 

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  • スピーチプライバシーのための楕円パーティションの提案

    中本英明, 豊田政弘, 矢入幹記

    日本音響学会関西支部若手研究者交流研究発表会  2013.12 

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  • Kinectと音響信号を用いた視覚障害者支援デバイスの開発

    古川晃司, 豊田政弘, 大谷真

    日本音響学会関西支部若手研究者交流研究発表会  2013.12 

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  • 導波管を用いた薄型吸音構造に関する研究

    山口智弥, 豊田政弘, 河井康人

    日本音響学会建築音響研究会  2013.12 

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  • 質点系を用いた境界条件の連成FDTD法への導入

    石川翔一郎, 豊田政弘, 河井康人

    日本音響学会建築音響研究会  2013.11 

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  • エッジ効果抑制型防音壁の開発

    小林正明, 松岡明彦, 鈴木信也, 河井康人, 豊田政弘

    秋季日本音響学会  2013.9 

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  • Finite-difference time-domain analysis of structure-borne sound using a plate/beam model

    Takumi Asakura, Takashi Ishizuka, Tohru Miyajima, Masahiro Toyoda, Shinichi Sakamoto

    Internoise2013  2013.9 

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  • 連成FDTD法における汎用的な境界条件の研究

    石川翔一郎, 豊田政弘, 河井康人

    秋季日本音響学会  2013.9 

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  • 導波管を利用した吸音構造の研究

    山口智弥, 豊田政弘, 河井康人

    秋季日本音響学会  2013.9 

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  • 立体型MPP空間吸音体に関する基礎的研究 －その１ 実験的検討－

    阪上公博, 矢入幹記, 豊田恵美, 豊田政弘

    秋季日本音響学会  2013.9 

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  • 立体型MPP空間吸音体に関する基礎的研究 －その２ 数値解析による理論的検討－

    豊田政弘, 小畠星司, 阪上公博

    秋季日本音響学会  2013.9 

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  • 固体伝搬音を対象とした板モデルによるFDTD解析 -複層構造物への適用事例-

    朝倉巧, 石塚崇, 宮島徹, 豊田政弘, 坂本慎一

    秋季日本音響学会  2013.9 

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  • エッジ効果抑制型遮音壁の実用化の検討 その3 防音ユニット上部枠の影響

    松岡明彦, 小林正明, 鈴木信也, 河井康人, 豊田政弘

    日本建築学会大会（北海道）  2013.8 

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  • 固体伝搬音を対象とした板モデルによるFDTD 解析 －実大構造物を対象とした検討－

    朝倉巧, 石塚崇, 宮島徹, 豊田政弘, 坂本慎一

    日本建築学会大会（北海道）  2013.8 

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  • エッジ効果抑制型遮音壁の実用化の検討 その2 支持鋼管の影響

    小林正明, 松岡明彦, 鈴木信也, 河井康人, 豊田政弘

    日本建築学会大会（北海道）  2013.8 

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  • 建物構造体の遮音性能向上に関する新しい技術の応用とその効果 Invited

    高橋大弐, 豊田政弘

    日本音響学会建築音響研究会  2013.7 

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  • 固体伝搬音を対象としたFDTD解析

    朝倉巧, 石塚崇, 宮島徹, 豊田政弘, 坂本慎一

    日本音響学会騒音振動研究会  2013.7 

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  • 気柱共鳴を利用した吸音構造について

    河井康人, 豊田政弘

    日本音響学会騒音振動研究会  2013.7 

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  • 導波管を利用した吸音構造の研究

    山口智弥, 豊田政弘, 河井康人

    日本建築学会近畿支部研究発表会  2013.6 

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  • 新しい吸音拡散構造の検討

    三好健太, 豊田政弘, 河井康人

    日本建築学会近畿支部研究発表会  2013.6 

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  • FDTD法によるインピーダンス境界について

    石川翔一郎, 豊田政弘, 河井康人

    日本建築学会近畿支部研究発表会  2013.6 

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  • 立体型MPP空間吸音体に関する実験的研究

    阪上公博, 矢入幹記, 豊田恵美, 豊田政弘

    日本音響学会建築音響研究会  2013.5 

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  • 立体型MPP空間吸音体に関する解析的研究

    豊田政弘, 小畠星司, 阪上公博

    日本音響学会建築音響研究会  2013.5 

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  • 固体伝搬音を対象とした板モデルによるFDTD 解析 －実大構造物を対象とした検討－

    朝倉巧, 石塚崇, 宮島徹, 豊田政弘, 坂本慎一

    春季日本音響学会  2013.3 

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  • 楕円パーティションの音響性能に関する解析的検討

    豊田政弘, 矢入幹記

    春季日本音響学会  2013.3 

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  • 固体伝搬音を対象とした板・梁モデルによるFDTD解析

    朝倉巧, 石塚崇, 宮島徹, 豊田政弘, 坂本慎一

    日本音響学会建築音響研究会  2013.2 

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  • 表面に吸音性を有する板のモデル化について

    豊田政弘, 河井康人, 高橋大弐

    日本音響学会建築音響研究会  2013.2 

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  • 時間領域有限差分法を用いた床衝撃騒音の予測

    豊田政弘, 高橋大弐, 河井康人

    第１７回関西大学先端科学技術シンポジウム  2013.1 

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  • エッジ効果抑制型ベランダ手すりの騒音低減効果

    朝田有亮, 豊田 政弘, 河井康人

    日本音響学会関西支部若手研究者交流研究発表会  2012.12 

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  • 導波管を利用した吸音構造の研究

    山口智弥, 豊田 政弘, 河井康人

    日本音響学会関西支部若手研究者交流研究発表会  2012.12 

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  • 新しい拡散吸音構造の検討

    三好健太, 豊田 政弘, 河井康人

    日本音響学会関西支部若手研究者交流研究発表会  2012.12 

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  • 布・筒状空洞カップリング吸音構造について

    大西咲生, 豊田政弘, 河井康人

    日本音響学会関西支部若手研究者交流研究発表会  2012.12 

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  • 布・空洞カップリング吸音構造について

    大西咲生, 豊田政弘, 河井康人

    秋季日本音響学会  2012.9 

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  • 布の音響設計用吸音力計算チャートについて

    三好健太, 豊田政弘, 河井康人

    秋季日本音響学会  2012.9 

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  • 室内周壁面への入射音響エネルギー角度分布測定精度の検証

    喜多恭平, 穆瑞林, 豊田政弘, 高橋大弐

    秋季日本音響学会  2012.9 

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  • 住宅の重量床衝撃音遮断性能予測について Invited

    豊田政弘, 高橋大弐, 河井康人

    秋季日本音響学会  2012.9 

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  • エッジ効果抑制型防音壁の実用化の検討

    小林正明, 松岡明彦, 鈴木信也, 河井康人, 豊田政弘

    日本建築学会大会（東海）  2012.9 

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  • 固体伝搬音を対象とした梁・板モデルによるFDTD 解析

    朝倉巧, 石塚崇, 宮島徹, 豊田政弘, 坂本慎一

    日本建築学会大会（東海）  2012.9 

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  • エッジ効果抑制型防音壁の実用化の検討

    小林正明, 松岡明彦, 鈴木信也, 河井康人, 豊田政弘

    秋季日本音響学会  2012.9 

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  • 固体伝搬音を対象とした梁・板モデルによるFDTD 解析 －複層モデルへの適用事例－

    朝倉巧, 石塚崇, 宮島徹, 豊田政弘, 坂本慎一

    秋季日本音響学会  2012.9 

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  • ベランダ形状が室内に侵入する騒音に与える影響

    朝田有亮, 豊田 政弘, 河井 康人

    秋季日本音響学会  2012.9 

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  • Sound insulation performance of edge-effect suppression barriers

    Yasuhito Kawai, Masahiro Toyoda

    Internoise 2012  2012.8 

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  • Measurement of directional distribution of incident acoustic energy on the boundary of a closed space by closely located 4-point microphone Invited

    Rui Lin Mu, Daiji Takahashi, Masahiro Toyoda

    Internoise 2012  2012.8 

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  • The finite-difference time-domain method for vibroacoustic problems

    Masahiro Toyoda, Daiji Takahashi, Yasuhito Kawai

    5th International Building Physics Conference  2012.5 

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  • Effect of air element in urethane foam mattress on impact sound of floor of a slab with panel flooring

    Rui Lin Mu, Masahiro Toyoda, Daiji Takahashi

    5th International Building Physics Conference  2012.5 

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  • ダクト開口端からの放射音低減に関する検討

    大西咲生, 豊田政弘, 河井康人

    春季日本音響学会  2012.3 

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  • エッジ効果を利用したダクト開口端からの放射音低減

    大西咲生, 豊田政弘, 河井康人

    日本音響学会建築音響研究会  2012.3 

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  • 固体伝搬音を対象とした梁・板モデルによるFDTD解析

    朝倉巧, 豊田政弘, 石塚崇, 宮島徹, 坂本慎一

    春季日本音響学会  2012.3 

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  • エッジ効果抑制型遮音壁の性能向上について

    河井康人, 豊田政弘

    春季日本音響学会  2012.3 

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  • Effect of damping materials on the sound insulation of double panel structure

    Rui Lin Mu, Masahiro Toyoda, Daiji Takahashi

    日本音響学会建築音響研究会  2012.1 

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  • 連成系FDTD解析と建築音響分野への応用 Invited

    豊田政弘

    日本音響学会関西支部若手研究者交流研究発表会  2011.12 

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  • Averaged material parameters and boundary conditions for the vibroacoustic FDTD method with irregular grid systems Invited

    Masahiro Toyoda, Daiji Takahashi

    Forum Acusticum 2011  2011.9 

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  • The improvement of sound insulation performance of double panel structures by using damping materials Invited

    Rui Lin Mu, Masahiro Toyoda, Daiji Takahashi

    Internoise 2011  2011.9 

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  • 振動音響連成FDTD法の汎用ソフトウェア開発に向けて Invited

    豊田政弘, 高橋大弐, 河井康人

    秋季日本音響学会  2011.9 

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  • ダクト開口端からの放射音の抑制

    大西咲生, 河井康人, 豊田政弘

    秋季日本音響学会  2011.9 

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  • 室内壁面の入射音響エネルギー角度分布

    穆瑞林, 豊田政弘, 高橋大弐

    秋季日本音響学会  2011.9 

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  • 時間領域有限差分法を用いた振動音響連成解析

    豊田政弘, 高橋大弐, 河井康人

    日本音響学会建築音響研究会  2011.7 

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  • 室内壁面への音響エネルギーの入射角度分布の測定

    水野聖也, 穆瑞林, 豊田政弘, 高橋大弐

    日本建築学会近畿支部研究発表会  2011.6 

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  • 室内周壁面への入射音響エネルギー角度分布の測定

    高橋大弐, 穆瑞林, 水野聖也, 豊田政弘

    日本音響学会建築音響研究会  2011.4 

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  • 不等間隔グリッドを用いた不均質FDTD解析のための平均媒質定数と境界条件について

    豊田政弘, 高橋大弐

    春季日本音響学会  2011.3 

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  • 異方性FDTD法による舞台床の振動解析

    豊田政弘, 宮崎秀生, 司馬義英, 田中亜美, 高橋大弐

    日本音響学会建築音響研究会  2011.1 

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  • 板振動型吸音体における背後ハニカムの影響 －その２ ハニカムによる吸音率変化のメカニズムについて－

    豊田政弘, 阪上公博, 森本政之, 高橋大弐

    秋季日本音響学会  2010.9 

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  • 音響管を用いた測定による有孔板振動理論の実験的検証

    西野祐輝, 穆瑞林, 豊田政弘, 高橋大弐

    秋季日本音響学会  2010.9 

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  • FDTD法を用いた加振位置の違いによる重量床衝撃音の変化についての検討

    豊田政弘, 高橋大弐

    日本建築学会大会（北陸）  2010.9 

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  • 板振動型吸音体における背後ハニカムの影響 －その１ ハニカムによる吸音率の低下について－

    阪上公博, 近藤真衣子, 森本政之, 豊田政弘

    秋季日本音響学会  2010.9 

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  • Prediction by the finite-difference time-domain method for vibroacoustic problems

    Masahiro Toyoda, Daiji Takahashi

    20th International Congress on Acoustics  2010.8 

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  • Effect of microperforation on sound insulation of double-leaf structures

    Rui Lin Mu, Masahiro Toyoda, Daiji Takahashi

    20th International Congress on Acoustics  2010.8 

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  • 音響振動連成系における有孔板振動理論の実験的検証

    西野祐輝, 穆瑞林, 豊田政弘, 高橋大弐

    日本音響学会建築音響研究会  2010.6 

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  • Rainfall noise from Ethylene/TetraFluoroEthylene air-cushion-membrane structures Invited

    Masahiro Toyoda, Daiji Takahashi

    Internoise 2010  2010.6 

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  • 薄板及び厚板理論とFDTD法による板振動解析

    豊田政弘, 高橋大弐

    日本音響学会建築音響研究会  2010.4 

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  • 解析解との比較による振動音響連成FDTD解析の予測精度に関する検討

    豊田政弘, 高橋大弐

    春季日本音響学会  2010.3 

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  • 空気層区画化処理による吸音・遮音技術

    豊田政弘, 高橋大弐

    春季日本音響学会  2010.3 

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  • 微細穿孔板を用いた二重窓構造に関する研究 －実験による検証及び遮音メカニズム－

    穆瑞林, 豊田政弘, 高橋大弐

    春季日本音響学会  2010.3 

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  • 二重床構造の重量衝撃音における空気抜きの効果に関する検討

    靍羽琢元, 豊田政弘, 高橋大弐

    春季日本音響学会  2010.3 

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  • 微細穿孔板の適用が二重窓構造の遮音性能に及ぼす影響

    穆瑞林, 豊田政弘, 松谷清孝, 高橋大弐

    日本音響学会建築音響研究会  2009.10 

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  • 複層ガラスの遮音性能向上に関する研究 －微細穿孔板を用いた二重窓構造の提案－

    穆瑞林, 豊田政弘, 高橋大弐

    秋季日本音響学会  2009.9 

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  • リアリティのある放射音場予測のための時間領域物理モデルの模索 Invited

    豊田政弘, 高橋大弐

    秋季日本音響学会  2009.9 

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  • 開孔率をパラメータとした微細穿孔板(MPP)による吸音特性の変遷について

    豊田政弘, 高橋大弐

    日本音響学会建築音響研究会  2009.8 

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  • Absorption characteristics of microperforated panels: Transition from panel-type absorption to acoustical transparency Invited

    Masahiro Toyoda, Rui Lin Mu, Daiji Takahashi

    Internoise 2009  2009.8 

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  • 有孔板とハニカム構造を用いた遮音技術及び二重床の放射特性について

    豊田政弘

    日本建築学会近畿支部音環境部会フレッシュドクターシリーズ  2009.7 

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  • 騒音振動問題に対するFDTD法への減衰導入と安定条件について

    豊田政弘, 高橋大弐

    春季日本音響学会  2009.3 

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  • 床衝撃音性能の数値シミュレーション

    豊田政弘, 高橋大弐

    日本建築学会音シンポジウム/日本音響学会建築音響研究会  2009.2 

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  • Experimental study on transmission loss of MPP structures with the air-layer-subdivision technique Invited

    Masahiro Toyoda, Daiji Takahashi

    Symposium on the Acoustics of Poro-Elastic Materials 2008  2008.12 

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  • 騒音振動問題に対するFDTD法を用いた放射音予測について

    豊田政弘, 高橋大弐

    秋季日本音響学会  2008.9 

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  • ３次元静止弾性体FDTD解析を用いた騒音振動予測手法の検討

    豊田政弘, 高橋大弐

    日本音響学会建築音響研究会  2008.7 

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  • Echo suppression effect and coloration of periodic-type diffusers Invited

    Masahiro Toyoda, Tomohiro Furukawa, Daiji Takahashi

    Acoustics '08 Paris  2008.6 

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  • 騒音振動問題に対するFDTD法を用いた周波数特性予測について

    豊田政弘, 高橋大弐

    春季日本音響学会  2008.3 

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  • 空気層区画化処理による遮音性能改善のメカニズム

    豊田政弘, 久後創, 高橋大弐

    日本音響学会建築音響研究会  2008.2 

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  • 空気層区画化処理が単板の透過損失に与える影響とそのメカニズムについて

    豊田政弘, 久後創, 清水貴史, 高橋大弐

    日本建築学会近畿支部環境工学部会環境工学シンポジウム  2007.11 

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  • 単板における区画化処理が遮音性能に与える効果

    久後創, 豊田政弘, 高橋大弐

    秋季日本音響学会  2007.9 

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  • Sound Insulation Characteristics of a Microperforated Panel with a Subdivided Air Layer Invited

    Masahiro Toyoda, Daiji Takahashi

    19th International Congress on Acoustics  2007.9 

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  • The Development of the Sound Field Sharing System Based on the Boundary Surface Control Principle

    Shiro Ise, Masahiro Toyoda, Seigo Enomoto, Satoshi Nakamura

    19th International Congress on Acoustics  2007.9 

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  • 騒音振動問題に対するFDTD解析の試み

    豊田政弘, 高橋大弐

    秋季日本音響学会  2007.9 

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  • 建物構造体の波動伝搬と固体音の解析に関する実験的検討

    加畑典利, 豊田政弘, 高橋大弐

    秋季日本音響学会  2007.9 

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  • 固体音の解析に関する実験による検討

    加畑典利, 豊田政弘, 高橋大弐

    日本建築学会近畿支部研究発表会  2007.6 

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  • 区画化処理が単板の透過損失に及ぼす影響

    久後創, 豊田政弘, 高橋大弐

    日本建築学会近畿支部研究発表会  2007.6 

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  • An Attempt of Sound Field Sharing System for Profound Communication Invited

    Shiro Ise, Masahiro Toyoda, Seigo Enomoto, Satoshi Nakamura

    1st International Symposium on Universal Communication  2007.6 

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  • 深いコミュニケーションを可能とする空間創造の試み －スピーカーとマイクロホン配置に関する基礎的検討－

    榎本成悟, 豊田政弘, 伊勢史郎, 中村哲

    春季日本音響学会  2007.3 

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  • 深いコミュニケーションを可能とする空間創造の試み －簡易型音場再現ルームの基本設計－

    豊田政弘, 榎本成悟, 伊勢史郎, 中村哲

    春季日本音響学会  2007.3 

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  • 深いコミュニケーションを可能とする空間創造の試み －プロジェクトの基本方針－

    伊勢史郎, 豊田政弘, 榎本成悟, 中村哲

    春季日本音響学会  2007.3 

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  • Development of New Sound Insulators with Perforated Board and Honeycomb Layer Systems Invited

    Masahiro Toyoda, Daiji Takahashi

    ASA/ASJ 4th Joint Meeting  2006.12 

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  • 建築構造体波動伝搬解析による室内各面からの放射音寄与の算定

    高橋大弐, 豊田政弘

    秋季日本音響学会  2006.9 

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  • 有限大二重板の透過損失に及ぼす中空層区画化の影響

    豊田政弘, 高橋大弐

    秋季日本音響学会  2006.9 

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    Presentation type：Oral presentation (general)  

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  • 有孔板とハニカム構造を用いた遮音構造

    豊田政弘, 田中幹人, 高橋大弐

    日本音響学会建築音響研究会  2006.6 

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  • 防振支持脚と周辺空気抜きが二重床の遮音効果に及ぼす影響についての理論的考察

    豊田政弘, 高橋大弐

    秋季日本音響学会  2005.9 

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    Presentation type：Oral presentation (general)  

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  • 振動面に接する空気層の区画化による遮音効果に関する実験的研究

    田中幹人, 豊田政弘, 高橋大弐

    秋季日本音響学会  2005.9 

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  • Improvement of Sound Insulation by Subdividing the Layer at the Radiating Surface

    Daiji Takahashi, Masahiro Toyoda

    12th International Congress on Sound and Vibration  2005.7 

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  • 放射音制御手法による床衝撃音低減効果

    豊田政弘, 田中幹人, 高橋大弐

    日本建築学会近畿支部環境工学部会環境工学シンポジウム  2004.11 

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  • ハニカム構造を用いた孔あき板吸音構造体の衝撃加振過渡応答特性

    豊田政弘, 高橋大弐

    秋季日本音響学会  2004.9 

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  • ハニカム構造を用いた孔あき板吸音構造体 -実験的検討-

    田中幹人, 豊田政弘, 高橋大弐

    秋季日本音響学会  2004.9 

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  • 振動面のインピーダンス制御による放射音減衰効果 実験での検討

    田中幹人, 豊田政弘, 高橋大弐

    日本建築学会近畿支部研究発表会  2004.6 

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  • Reduction of Sound Radiation by Perforated Absorber System

    Masahiro Toyoda, Daiji Takahashi

    18th International Congress on Acoustics  2004.4 

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  • ハニカム構造を用いた孔あき板吸音構造体

    豊田政弘, 高橋大弐

    秋季日本音響学会  2003.9 

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  • 孔あき板吸音構造体を用いた床衝撃音低減効果に関する研究

    豊田政弘, 高橋大弐

    日本建築学会近畿支部研究発表会  2003.6 

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  • ステージエンクロージャ問題における拡散処理の効果

    豊田政弘, 宮崎裕輔, 戸田和美, 高橋大弐

    日本音響学会関西支部ホール音響談話会  2002.11 

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  • 音響放射面のインピーダンス制御による放射音低減効果に関する実験的検討

    豊田政弘, 中川貴史, 江富和朗, 高橋大弐

    秋季日本音響学会  2002.9 

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  • Effects of Surface Diffusion of Reflectors on the Acoustic Power from the Stage Area Invited

    Daiji Takahashi, Nagomi Toda, Masahiro Toyoda

    Forum Acusticum 2002  2002.9 

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  • 吸音面の面積効果の解析

    河井康人, 夫婦岩宏茂, 堀之内吉成, 豊田政弘

    日本音響学会建築音響研究会  2002.8 

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  • 音圧・インテンシティー場の解析結果を用いた吸音材の面積効果の検討

    豊田政弘, 堀之内吉成, 河井康人

    春季日本音響学会  2002.3 

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  • 座席列周辺における音圧分布及びインテンシティー分布の可視化

    豊田政弘, 堀之内吉成

    秋季日本音響学会  2001.9 

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    Presentation type：Oral presentation (general)  

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  • 座席列周辺における音圧・インテンシティー分布の可視化

    堀之内吉成, 豊田政弘

    日本音響学会建築音響研究会  2001.8 

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  • 座席列周辺における音圧分布及びインテンシティー分布について

    豊田政弘, 堀之内吉成

    日本建築学会近畿支部研究発表会  2001.6 

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    Presentation type：Oral presentation (general)  

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Industrial property rights

  • 端部部品とそれを用いた遮音壁

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    Application no：特願2021-121483  Date applied：2021.7

    Announcement no：特開2023-017306  Date announced：2023.2

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  • 音響空間共有装置

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    Application no：特願2007-061107  Date applied：2007.3

    Announcement no：特開2008-227773  Date announced：2008.9

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  • 三次元音場再生装置

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    Application no：特願2006-301941  Date applied：2006.11

    Announcement no：特開2008-118559  Date announced：2008.5

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Awards

  • Furui prize ASJ Paper Award

    2024.3   Acoustical Society of Japan  

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  • Sato Paper Award

    2015.3   Acoustical Society of Japan  

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    Country：Japan

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  • Best Comentator Award

    2014.12   Acoustical Society of Japan, Kansai Chapter  

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    Country：Japan

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  • Contribution Award

    2014.3   Acoustical Society of Japan  

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    Country：Japan

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  • Environmental Acoustics Award

    2013.3   Acoustical Society of Japan  

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    Country：Japan

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  • Sato Paper Award

    2010.3   Acoustical Society of Japan  

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    Country：Japan

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  • Awaya Kiyoshi Award

    2009.3   Acoustical Society of Japan  

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    Country：Japan

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Research Projects

  • Study on vibroacoustic analysis of heterogeneous anisotropic media using the finite-difference time-domain method

    Grant number：22760440  2010 - 2011

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Young Scientists (B)

    TOYODA Masahiro

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    Grant amount：\1560000 （ Direct Cost: \1200000 、 Indirect Cost：\360000 ）

    Prediction method using the finite-difference time-domain method for floor impact noise was proposed. The method can deal with heterogeneous and anisotropic media including wooden materials. Software with a graphical user interface was also developed for nonprofessionals to practically predict the noise using graphic processing units.

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Social Activities

  • 堺市廃棄物処理施設及び汚染土壌処理施設に係る専門委員

    2024.6 - Present

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  • 豊中市大規模小売店舗立地審議会委員

    2016.6 - 2017.3

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  • 日本建築総合試験所音光環境性能評価委員会

    2016.4

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  • 大阪府大規模小売店舗立地審議会委員

    2014.12 - 2016.11

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  • 船内騒音測定技術者講習会運営委員会委員

    2014.10

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  • 堺市大規模小売店舗立地審議会委員

    2012.4 - 2017.3

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  • 八尾市大規模小売店舗立地審議会委員

    2012.4 - 2016.3

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