摘要
利用有限元和间接边界元的声振耦合方程同时计算结构表面的振动和相应的辐射声场 ,将结构的物理坐标转化成模态基本量来表示 ,对完全耦合的结构动力学方程及声场方程进行解耦。对浸没于两种流体介质中的椭圆球壳体的数值计算结果表明 ,流体介质改变了结构的共振特性及声辐射特性。
The numerical method of a coupled finite element indirect boundary element equation for computing both the structural vibration and the corresponding acoustic radiation is presented. The physical degrees of freedom of the structure are expressed in terms of its modal basis in vacuum to decouple the computation from the entire structural acoustic coupling equations. Numerical results for the ellipsoidal shell immersed in two different fluids indicate that heavy fluid changes greatly structural vibrational and acoustical behavior. This method can be applied to the analysis of vibration and sound for random complex body in fluids.
出处
《振动工程学报》
EI
CSCD
北大核心
2002年第3期363-367,共5页
Journal of Vibration Engineering
关键词
FEM
IBEM
计算
流体介质
壳体
结构声耦合
有限元
声辐射
结构振动
finite element method
thin shells
acoustic radiation
coupled structural acoustic simulation
indirect boundary method
