摘要
基于用振动频率的升幂级数作为插值函数的动态有限单元FDE(Finite Dynamic Element)的动态有限元法DEM(Dynamic Element Method),能显著地提高结构固有频率和振型的计算精度、降低计算费用。本文详细讨论了DEM与FEM在构造插值函数中的区别,以及在DEM中所使用的单元刚阵和单元质阵中的动力修正项。
The Dynamec Element Method (DEM), in which the series in. ascending powres of vibration frequency. is expressed as the interpolation functios, can increase calculation aecuracy of natural frequency and of mode shapes of the structure, and reduce the computing time and cost. This paper discusses in detail the difference between DEM and FEM in constructing the interpolation. The dynamic correction terms in the element stiffness matrix and mass matrix of the finite dynamic elements are presented.
关键词
动态有限元法
结构分析
有限元法
polynomial interpolation
finite element methods
dynamic element methods
