摘要
给出横向各向同性介质中ＳＨ波的标量波动方程，并通过简单的坐标变换，将其化为标准的Ｈｅlｍｈｏｌｔｚ方程．建立了求解散射问题的积分方程，利用边界单元方法数值计算了横向各向同性固体中圆柱状空洞及刚性散射体对ＳＨ波的散射场分布。重点分析了各向异性对空洞散射体散射场指向性的影响．
Two-dimensional scalar equation of displacement for the cross--plane shear elastic waves inhomogeneous and transversely isotropic media like unidirectional fibrous composites is derived. Then,through a simple coordinate system tranform, the scalar equation is standardized into a Helmholtzequation. Integral equations are derived for the scattering problems and boudary element method isused t o calculate the scattered cross-plane wave fields by circular cylinders in transversely isotropicmedia numerically. A discussion is given on the results which is mainly focused on the influence of theanisotropy to the directivity of the scattered fields by circular cylindrical voids.
出处
《声学学报》
EI
CSCD
北大核心
1999年第6期627-636,共10页
Acta Acustica
