片状域流场中三维结构的湿频率和湿模态  

Wet frequencies and wet modals of 3-D structures in an infinite liquid with constant depth

作　　者：苏海东[1] 黄玉盈[1] 陈琴[2] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]长江科学院材料与结构研究所,湖北武汉430010

出　　处：《华中科技大学学报（自然科学版）》2007年第1期121-124,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10172038)

摘　　要：应用有限元-边界元混合法分析了等深度的无限大片状域流场中三维结构的自由耦振问题.采用四面体单元形成结构的有限元网格以便于网格的自动剖分,导出了与之配套的混合法计算格式.引入无限大片状域流场的格林函数,使流场的边界元剖分仅限于液固交界面,从而大大减少了计算量.为简化编程,提出了大型有限元分析软件的接口技术,提高了效率.椭圆柱体的数值算例表明了方法的有效性.提出的方法为进一步研究受迫耦振问题奠定了基础,所采用的大型软件接口技术也为应用有限元-边界元混合法解决类似问题提供了一条简单的途径.A mixed FE-BE method is used to analyze fluid-structure coupling free vibrations of 3-D structures in an infinite liquid with constant depth. Tetrahedral meshes of the structure are formed by automatic subdivision, and corresponding coupling equations are derived. Based on the Green function corresponding to an infinite liquid with constant depth, only surfaces of the structure need to be divided into boundary elements, and computation time decreases greatly. Interface of general FEM software is also used to improve the efficiency of programming and computation. Numerical example of a column with ellipse cross-section is given to illustrate the efficiency of the proposed method. This paper lays the foundation of analysis for coupling forced vibration, and proposes that using the interface of general FEM software is a new simple way for the mixed FE-BE method.

关 键 词：三维结构 液固耦合振动 有限元-边界元混合法 

分 类 号：TU311.4[建筑科学—结构工程]