流固耦合振动分析的位移协调型模态综合法

基于无粘可压流体在无旋罚系数下同固体耦合振动分析的位能型泛函,推导了流固耦合振动分析的位移元及位移协调子结构-子区域模型的方程。应用所编程序FSIAP,计算了坝水耦合地震响应的算例,验证了方法及程序。

MODE SYNTHESIS METHOD WITH DISPLACEMENT COMPATIBILITYFOR DYNAMIC ANALYSIS OF FLUID-SOLID INTERACTION PROBLEMS

Based on the potential energy action functional （1） for dynamic analysis of fluid-solid interaction problems, where some rotations in a com-pressible-inviscid fluid have been constrained by means of a penalty coefficient B, formulas （16）, （19）, （20） and （22） of a compatible finite element and the corresponding substructure-subdomain model are derived. A computer program - FSIAP has been developed. Some examples concerning earthquake response of a Dam-water system are calculated. The results drawn in Fig. 2-Fig. 7 and listed in Table 1 show that the displacement finite element method with the frequency shift technique and the substructure-subdomain technique described in the paper is appealing. for computing dynamic response of fluid-solid interaction systems and that with the same accuracy the mode synthesis method is much more economical than general finite element methods.