水工泄水结构振动的模态分析与有限元综合法

A Synthetic Method of Modal Analysis and Finite Element for Vibration of Hydraulic Outlet Structure

本文在回顾模态识别和动特性灵敏度分析的基础上，探讨了结构动力修改的模态分析、有限元综合法，并通过动态响应的计算机仿真分析方法进行方案评估。通过工程实例，分析了结构物理参数（刚度、质量）对模态频率、振动位移的灵敏度，取得了动态薄弱环节及优化方向。通过系列动力修改及响应仿真分析，取得抗振优化方案。

Based On modal analysis and parameter sensitivities of dynamic characteristics of structure,a synthetic method of modal analysis and finite element for conducting dynamic modification of structure is provided in this paper,and an analogue computing method for forced vibration is also discussed. With an engineering example,the sensitivities of physical parameters of structure to modal frequencies and displacements are analyzed,consequently,dyamic weak position and optimization orientation of the structure under discussion are found. After a series of dynamic modification and response analogue analysis,the variation of resonant frequencies and vibration response with physical parameters of structure are obtained.