层状多孔介质中声反射和透射

Reflection and transmission of acoustic wave on multilayered porous media

本文根据流体饱和多孔介质中声传播的Biot理论和多孔介质界面上的六个边界条件研究了平面声波斜入射于多层水平板状多孔介质时的反射和透射。数值计算了快纵波为入射波时声波频率、入射角等量的变化对能量的反射系数、透射系数的影响。数值计算结果表明,当声波波长与中间介质厚度呈一定比例时,反射系数、透射系数取得极值,入射角、多孔介质的性质对反射系数、透射系数的影响很大。

Based on the Biot theory of sound propagation in fluid-saturated porous medium we have studied in this paper the sound reflection and transmission on multilayered porous media, in which the adequate boundary conditions across interfaces are taken into account. Numerical calculation of the reflection and transmission coefficients at different incident angles and frequencies of the fast compressional wave incident on porous media with three layers are presented. The results indicate that the maxmum or minimum reflection and transmission coefficients appear when the ratio of the wavelength to the thickness equals to certain valus the sound incident angle and porous media properties are shown to give great influence on these coefficients.