Experimental and numerical studies on reverberation characteristics in a rectangular room with unevenly distributed absorbers(<Special issue>introduction to the amazing world of sounds with demonstrations)
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概要
- 論文の詳細を見る
The reverberation time in a room with unevenly distributed sound absorbers, such as a room having an absorptive floor and/or ceiling, is often observed to be longer in the middle- and high-frequency ranges than the values obtained using the Sabine/Eyring formula. In the present study, this phenomenon was investigated through a scale-model experiment and three-dimensional wave-based numerical analysis. The reverberation time in a room having an absorptive floor and/or ceiling was verified to be longer in the middle- and high-frequency ranges, and the arrangement of absorbers was found to affect the frequency characteristic of the reverberation time. The increase in the reverberation time is caused by the slow decay of the axial and tangential modes in the horizontal direction. The reverberation time is longer in the high-frequency range (in which the wavelength is sufficiently shorter compared with the height of the ceiling) than in the low-frequency range, even when the frequency characteristics of the absorption coefficients of the absorbers are flat. As a means of improving such an uneven reverberation time in a room, both the placement of diffusers in the vertical direction and the use of inwardly inclined walls (in rooms with highly absorptive floors) have been found to be effective.
- 社団法人日本音響学会の論文
著者
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Tachibana Hideki
Chiba Institute Of Technology
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Tachibana Hideki
Department Of Building And Civil Engineering I.i.s. University Of Tokyo
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Tachibana H
Chiba Inst. Technol. Narashino Jpn
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Sakamoto Shinichi
Institute of Industrial Science, University of Tokyo
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Sakamoto Shinichi
Institute Of Industrial Science The University Of Tokyo
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Sakamoto Shinichi
Inst. Of Industrial Sci. The Univ. Of Tokyo
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Ushiyama Ayumi
Daiwa house industry Co., Ltd.
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Yasuda Yosuke
Institute of Industrial Science, The University of Tokyo
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Ushiyama Ayumi
Central Research Laboratory, Daiwa House Industry Co., Ltd.
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Tachibana Hideki
Faculty of Information and Computer Science, Chiba Institute of Technology
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Tachibana Hideki
Chiba Inst. Of Technol.
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Ushiyama Ayumi
Daiwa House Industry Co. Ltd.
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Yasuda Yosuke
Graduate School Of Frontier Sciences The Univ. Of Tokyo
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Yasuda Yosuke
Graduate School Of Frontier Sciences The University Of Tokyo
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Sakamoto Shinnichi
Institute of Industrial Science, The University of Tokyo
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