开口薄壁结构声固耦合问题的计算方法

Numerical methods for acoustic-structural coupling problem of open thin-walled structure

对于开口薄壁结构的声辐射问题,很难用解析法直接计算,可采用多种数值方法进行仿真分析。文中研究了有限元法、边界元法与无限元法几种数值方法及其耦合的理论基础,研究了求解不封闭声腔声辐射问题的几种数值方法。在考虑声固耦合的前提下,分析了间接边界元法、直接边界元内外声场耦合法、有限元与边界元耦合法、有限元与无限元耦合法4种方法求解开口结构声场问题的系统方程及求解过程,以具体开口薄壁结构为实例采用4种方法进行了模拟计算,并对结果进行了分析比较,得出相关结论。

For acoustic radiation problem of open thin-walled structure,although it was difficult to calculate directly by analytical method,the simulation analysis can be done by several numerical methods.This paper had discussed several numerical methods as FEM（Finite Element Method）,BEM（Boundary Element Method） and IFEM（Infinite Element Method） and the numerical methods as well as the theory foundation for coupling.Several numerical methods for solving unclosed structure radiation problem were also studied.Under the premise of structure-acoustic coupling,this paper analyzed the systemic equation and process to solve acoustic field problem of open structure by using 4 methods as IBEM（Indirectly Boundary Element Method）,DBEM（Directly Boundary Element Method） coupling method of interior and exterior fields,FEM and BEM coupling method,FEM and IFEM coupling method.This paper took the open structure as practical example to carry out simulation calculation by applying these 4 methods,relevant conclusions were obtained by analysis and comparison of the results.