多孔質材料表面からの音の放射

概要

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The sound fields radiated from a surface of porous material vibrating uniformly were theoretically investigated. We adopted a capillary tube model as an analytical model of porous material to compute the interactive effects between the fluid in the pore and the solid frame of the porous material in motion. We made some discussions and numerial calculations on the radiation efficiency coefficients as one dimensional problems. For the porous material of finite thickness placed on a rigid piston, the radiation efficiency coefficients were measured and compared with the predicted ones obtained based on the assumption that the porous material vibrates uniformly. Roughly saying from these result, the radiation efficiency coefficient generally becomes small when the porous material placed on the piston vibrates in high frequency range.
社団法人日本音響学会の論文
1978-12-01