ANALYSIS METHOD FOR SPHERICAL SURFACE WAVE ELEMENT WITH ANISOTROPY

PROBLEM TO BE SOLVED: To provide an analysis device operating a finite element method polar coordinate system wave propagation code calculating a surface acoustic wave propagation characteristic of an anisotropic single crystal so as to provide a spherical surface acoustic wave element and a spherical optical surface wave element. SOLUTION: In this analysis device operating the finite element method polar coordinate system wave propagation code calculating the surface acoustic wave propagation characteristic of the anisotropic single crystal, a spherical shell model using a polar coordinate system is created, an obstacle installed so as to change a surface wave propagation path is created on a spherical shell, an IDT model that is an ultrasonic transmission/reception element is created on a spherical surface, a hexahedron element using polar coordinates is created by an automatic mesh, and the finite element method polar coordinate system wave propagation code is executed according to an analysis condition. In the code, speed-up of the calculation is attained by use of a shape symmetry of the element in the polar coordinates and a symmetry of an element physical property value in a material. As an analysis result, displacement of the spherical surface and a spherical inside, a snapshot of strain or a stress value, or a time history waveform can be obtained. COPYRIGHT: (C)2007,JPO&INPIT