多層形吸音材垂直入射吸音率の境界要素法による予測

概要

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A method of predicting sound absorbing capability for multi layer sound absorbing materials was studied by using the boundary element method. The sound absorbing material was considered as a medium transmitting sound waves, and it was characterized by the complex propagation speed and the complex effective density, which were measured using the two-microphone technique. The sound field containing the sound absorbing materials was analyzed using the boundary element method developed for multi domain problems. The normal sound absorption coefficient of the materials was calculated and compared with the experimental coefficients. The excellent agreement achieved suggests that the present method is sufficiently reliable to predict the normal sound absorption coefficient.
一般社団法人日本機械学会の論文
1990-12-25