旋转态离心叶轮的动力分析

本文着重讨论旋转态离心叶轮的动力分析。对叶轮的重复扇形区作多部件的分划,研究其结构的模化并应用Benfield模态代入法和群论变换,分析叶轮非旋转与旋转态的固有特性。在旋转态分析中,将子结构联立迭代法扩展用于多子结构分划的结构中。考虑其几何非线性,求出在离心力场中结构的动平衡位置和应力。 

DYNAMIC ANALYSIS OF CENTRIFUGAL IMPELLER

A dynamic analysis technique is provided for rotating centrifugal impeller with guide blades and split blades.It is shown that multi component partition can be made in repetitive sector region of the centrifugal impeller.The basic repetitive sector region of the centrifugal impeller is divided into three substructures:the guide blade,the split blade and the sectoral part of the disc.The Hermite generalized mass and stiffness matrices in the reduced coordinates are derived by successful combination of Benfield mode substitution transformation with group transformation.Therefrom the natural frequencies of the bladed disc coupled system are solved and the corresponding modal shapes are obtained from further transformation.The comparison between the analytical results obtained by using this and other methods and the experimental data verifies the reliability,practicability and considerable economic benefits of the method pressented in this paper.