Determination of the Acoustical Parameters of Porous Metals Based on Johnson-Champoux-Allard Model

摘要

The attention in this work is focused on the determination of the acoustical parameters of porous materials.On the basis of Johnson-Champoux-Allard model,an analytical and extrapolation method are applied starting from the dynamic density of equivalent fluid in air-saturated rigid-frame porous media,Finally,the validity and adaptability of the abovementioned methods are verified and discussed.In addition,a type of sintered porous metal which one may concern in practical engineering is used for comparisons.The necessary discussions for results are made also.