包含多孔媒质的柱状复合结构中轴对称声导波

AXISYMMETRIC GUIDED WAVES IN CYLINDRICAL COMPOSITE STRUCTURES WITH A POROUS INNER WALL

利用Ｂｉｏｔ多孔媒质声学理论及多孔媒质界面边界条件，导出了包含多孔媒质的柱状复合结构中轴对称声导波的广义色散方程，考察了流体和多孔媒质界面状况及多孔媒质中慢纵波对轴对称声导波色散特性的影响．

Using the Biot theory about acoustic waves in a porous medium and boundary conditions of the porous medium interface, we derive the generalized frequency equation for axisymmetric guided waves in cylindrical composite structures with a porous inner wall. The influences of slow longitudinal wave in the porous medium and boundary conditions at fluid-porous medium interface on axisymmetric guided waves are considered. Numerical computations are made for the dependence of phase velocities of the lower order axisymmetric guided waves in the cylindrical composite structure on the thickness and porosity of the inner porous wall.