エッジに平行な狭い領域を吸音処理した障壁の減音効果

概要

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It has been reported by some authors that the noise reduction by an absorptive barrier is due mainly to the absorbing material attached to the narrow surface(nearly a wavelength in width) along the barrier edge. This phenomenon is very interesring, and it may be useful for the economical design of barrier. In this study, (1)We will show a method of estimating the sound attenuation by thin barrier with an absorbent strip attached to the arbitrary region of the source side surface. (2)We have investigation of the relative sound pressure level fluctuation due to variation of the width of absorbing(or reflecting) region along the barrier edge. Macdonald's formula for a thin barrier and Pierce's formula for the double edge diffraction by a thick three-sided barrier are used in this study. The calculated results for several kinds of small-scale model, obtained by present procedure, are compared with experimental results.
社団法人日本音響学会の論文
1985-04-01