叶轮转子-轴承-干气密封系统模态分析及谐响应分析

Modal analysis and harmonic response analysis of impeller rotor-bearing-dry gas seal system

以“叶轮转子-轴承-干气密封”系统的动态特性为研究对象,利用软件ANSYS建立有限元模型,对系统进行满载条件下模态分析,得到该系统各阶固有频率和振型,对该系统进行空载条件下模态分析.对比上述两种固有频率发现:工况下干气密封系统及叶轮转子所受的力降低了系统固有频率.以系统不平衡量为体载荷,通过谐响应分析方法得到系统的稳态不平衡响应曲线.

Taking dynamic characteristics of a large system“impeller rotor-bearing-dry gas seal”system as a research object,a finite element model has been established by adopting ANSYS software.The model is used to analyze the gas sealing system under full load condition,and natural frequencies and vibration modes in various stages are obtained.The modal analysis of the system under non-loading condition is then carried out,and the natural frequencies under above two conditions are compared and analyzed with each other.Compared with the above two natural frequencies,it is found that the force acting on the dry gas sealing system and the impeller rotor reduces natural frequency of the system.Finally,taking the unbalance of the system as body load,the steady-state unbalanced response curve of the system can be obtained by a harmonic response analysis method.