1980•Journal of the Acoustical Society of Japan (E)Open access

Method of estimating the reverberant sound absorption coefficient of the absorbing structure composed of different plane porous materials.

Kyoji Fujiwara, Yasuo Makita

Abstract

A method of estimating the reverberant sound absorption coefficient of an absorbing structure composed of several different plane porous materials without measurements in a reverberation room is studied. It is found that the reverberant sound absorption coefficient of this structure may be calculated in terms of the acoustic parameters of the constituent materials, their shapes, the mounting conditions and the dimensions of the room. The validity of the method is verified by experiments.

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Key concepts: Noise reduction coefficient, Reverberation, Attenuation coefficient, Materials science, Acoustics, Reverberation room, Absorption (acoustics), Plane (geometry)