非线性裂纹转子密封系统的耦合振动分析  

Study on Coupled Vibration of Nonlinear Cracked Rotor Seal System

作　　者：高崇仁[1] 殷玉枫[1] 姚德臣[1] 朱建儒[1] 

机构地区：[1]太原科技大学机电学院,太原030024

出　　处：《机械设计与研究》2009年第1期27-31,共5页Machine Design And Research

基　　金：山西省自然科学基金资助项目(2006011062)

摘　　要：随着旋转机械结构参数的提高,作用在转子上的密封中的气流激振力将显著增大。本文针对裂纹转子密封系统进行了研究。应用Muszynska非线性密封力模型,建立了在密封中的气流激振力作用下的裂纹转子系统耦合动力学方程,分析了在非线性密封力作用下的裂纹转子运动特性,并着重讨论了迷宫密封的物理和结构参数对裂纹转子运动特性的影响。研究结果表明,系统具有非常丰富的非线性动力学行为,密封中的气流激振力对裂纹转子的周期运动有明显的抑制作用,密封结构的各主要参数对系统稳定性有很大影响,故可以通过调整密封参数来改善系统的动态稳定性,这为旋转机械的理论设计和故障动态监测提供了理论依据。With the structural parameters of the rotary machine increased,the seal airflow induced force imposed on the rotor will significantly increase.Taking cracked rotor system as object the seal behaviors are studied.The Muszynska＇s model of the nonlinear seal force is applied to building the coupled dynamic equation and analyzing the movement character of cracked rotor with airflow induced force.The effect of physical and structural parameters of labyrinth seal on movement character of cracked rotor is emphatically discussed.The research results show that the nonlinear dynamics character is very plentiful in the cracked rotor seal system,the airflow induced force can reduce the periodic response of the cracked rotor,the main parameters of the sealed structure have important impact on the stability of cracked rotor system,and the dynamic stability can be improved by adjusting seal parameters.The research results also provide the theoretical foundation for theoretical design of rotary machine and dynamic monitoring its fault.

关 键 词：非线性密封力 裂纹转子 耦合振动 气流激振 

分 类 号：TH113.1[机械工程—机械设计及理论]