叶轮转子-轴承-干气密封系统固有频率的计算及分析  

Calculation and Analysis of Natural Frequency of Impeller Rotor-Bearing-Dry Gas Seal System

作　　者：张伟政[1] 林智 丁雪兴[1] 吴传扬 Zhang Weizheng;Lin Zhi;Ding Xuexing;Wu Chuanyang(College of Petrochemical Industry,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050

出　　处：《甘肃科学学报》2021年第2期122-127,共6页Journal of Gansu Sciences

基　　金：甘肃省自然科学基金(18JR3RA145)。

摘　　要：为避免干气密封系统在高速工作环境中发生共振现象,以叶轮转子-轴承-干气密封组成的大系统为研究对象,求解系统的固有频率,分析其动态特性。利用传递矩阵法,计算得出系统的四阶固有频率;采用有限元法对系统进行模态分析,得到其固有频率及振型图;再基于误差法和内积相关性法对2种方法所得到的固有频率进行对比分析,得出误差最大在8%左右,且内积相关度为0.948,吻合度较高。通过计算和仿真验证,证实2种方法的可行性,得出该系统工作转速不能大于10290.6 r/min,为以后叶轮转子-轴承-干气密封系统的动态特性分析提供了参考。In order to avoid the resonance phenomenon of the dry gas sealing system in the high-speed working environment,the large system composed of the impeller rotor-bearing-dry gas seal is taken as the research object,and the natural frequency of the system is solved to analyze its dynamic characteristics.Using the transfer matrix method,the fourth-order natural frequency of the system is calculated.The finite element method is used to analyze the modality of the system,and the natural frequency and mode shape are obtained.Based on the error method and the inner product correlation method,the obtained two natural frequency was compared and analyzed.The maximum error was about 8%,and the correlation of internal product was 0.948,and the degree of coincidence was high.The research shows that the feasibility of the two methods is verified by calculation and simulation that the working speed of the system can not be greater than 10290.6 r/min,which provides a sufficient basis for the dynamic analysis of the impeller rotor-bearing-dry gas sealing system.

关 键 词：干气密封 固有频率 传递矩阵法 有限元法 内积相关性 

分 类 号：TQ051[化学工程] TH113.1[机械工程—机械设计及理论]