混流式水轮机整体结构有限元分析

由于混流式水轮机整体结构的复杂性,因没有成熟的理论指导,在设计阶段对动力特性难加以考虑.通过有限元建立其动力学控制方程,以大型有限元软件为平台建立有限元计算模型,并使用先进的Lanczos法对结构整体与局部模态分析确定结构的固有频率和振型等动力特性.同时与其他振源频率进行了比较分析,研究其出现共振的可能性.

Finite element analysis on integral structure of francis turbine

Since the complexity of holistic constructure of francis turbine, it is hard to think about dynamical characteristic in design period without mature theory. This paper describes the control equation of dynamics by finite element method. The finite element model (FEM) is established by using finite element software. The advanced mode computational Lanczos-method is used for the modal analysis of the integral and integrant structure to determine the dynamic behaviour-intrinsic frequency and mode shape. At the same time, it is compared with the frequency of other vibration sources for researching the possibility of sympathetic vibration.