ANALYSIS ON ACOUSTICAL SCATTERING BY A CRACKED ELASTIC STRUCTURE

• 来源期刊: 固体力学学报(英文版)
• 学科: 工学
• 年，卷（期）: 2003,（3）
• 页码范围: 262-268
• 页数: 7页
• 分类号: TU313
• 语种: 中文

摘要

The acoustical scattering by a cracked elastic structure is studied.The mixed methodof boundary element and fractal finite element is adopted to solve the cracked structure-acousticcoupling problem.The fractal two-level finite element method is employed for the cracked struc-ture,which can reduce the degree of freedoms(DOFs)greatly,and the boundary element methodis used for the exterior acoustic field which can automatically satisfy Sommerfeld's radiation con-dition.Numerical examples show that the resonance frequency is lower with the crack's depthincrease,and that the effect on the acoustical field by the crack is particularly pronounced in thevicinity of the crack tip.This mixed method of boundary element and finite element is effectivein solving the scattering problem by a cracked structure.