2021 Fiscal Year Final Research Report
Innovation of architectural acoustics designing process based on the concept of ensemble averaging technique
Project/Area Number |
19H02298
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 23020:Architectural environment and building equipment-related
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Research Institution | Oita University |
Principal Investigator |
Otsuru Toru 大分大学, 理工学部, 客員教授 (30152193)
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Co-Investigator(Kenkyū-buntansha) |
岡本 則子 大分大学, 理工学部, 准教授 (00452912)
富来 礼次 大分大学, 理工学部, 教授 (20420648)
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Project Period (FY) |
2019-04-01 – 2022-03-31
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Keywords | 建築音響 / 吸音測定 / 有限要素法 / 音圧ー粒子速度センサ / アンサンブル平均 |
Outline of Final Research Achievements |
To improve acoustic conditions in built environments, theoretical, computational and experimental investigations are conducted. The theoretical basis of the measurement method for sound absorption characteristics of materials using the ensemble averaging technique (EA method) is presented. Applicational experiments of EA method are conducted in various rooms revealed EA method's robustness. A new system to measure sound absorption of complicated porous bricks is developed and experiments using the system show satisfactory agreements with those measured by the impedance tube method. Three dimensional PU sensor is expected to bring innovations, while insufficient information is presented, so far. A practical calibration method with an impedance tube is proposed and several applications are conducted to show the sensor's fundamental potential. Several room acoustics simulations by FEM revealed that appropriate shapes and absorptions are indispensable to establish good acoustics.
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Free Research Field |
建築環境・設備
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Academic Significance and Societal Importance of the Research Achievements |
内外学会等で建築音環境に対する様々な苦情が報告されている。その解決を難しくする主たる原因は建築の複雑性にあり、とりわけ施工後の壁面の吸音特性が不明瞭なことがコンピュータ解析等科学的対策の障壁となっている。本研究ではアンサンブル平均概念の敷衍で複雑性を克服し、現場での吸音率とインピーダンス測定を可能とした。測定値を波動音響シミュレーションへ入力すれば複雑な室空間の詳細な音場解析が実現される。また、音響学に革新をもたらしつつある3軸PUセンサに関し、実用的校正法とともに音響エネルギ等測定への応用例を示しており、学術的・社会的に有意義である。
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