基础激励下转子-轴承-支座系统动力学特性研究  

Study on Dynamic Characteristics of Rotor-bearing-support Systems under Foundation Excitation

作　　者：徐敬岗 邓景珊[1] 李峰 XU Jinggang;DENG Jingshan;LI Feng(School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444,China;School of Intelligent Manufacturing,Changzhou Vocational Institute of Engineering,Changzhou 213164,Jiangsu,China;School of Electrical and Information Engineering,Jiangsu University of Technology,Changzhou 213001,Jiangsu,China)

机构地区：[1]上海大学机电工程与自动化学院,上海200444 [2]常州工程职业技术学院智能制造学院,江苏常州213164 [3]江苏理工学院电气信息工程学院,江苏常州213001

出　　处：《噪声与振动控制》2022年第5期66-73,共8页Noise and Vibration Control

基　　金：江苏省自然科学基金资助项目(BK20191035)。

摘　　要：针对基础激励影响转子轴承系统动力学特性问题,提出基于有限元和集中质量法的转子系统耦合动力学模型,分析基础激励对系统动力学特性的影响规律。模型中,转子采用梁单元离散建立有限元模型,滚动轴承考虑非线性接触力和间隙影响,支承阻尼环采用Kelvin-Voigt线性力学模型表征其力学特征。通过Runge-Kutta数值方法研究基础位移激励对系统动力学行为的影响规律;在此基础上,基于遗传算法对支承阻尼环的动力学参数进行优化设计。结果表明:基础在水平或垂直方向上的位移激励不仅对该方向转子振动有影响,对其他方向振动也存在一定影响;基础激励频率不等于滚动轴承VC(Varying Compliance)频率或其谐波频率时,系统中出现了组合共振现象;同时,经优化设计后,基础激励对系统动力学行为的影响显著降低。研究结果为基础振动下转子轴承系统的动力学分析提供了理论支撑。Influence of the foundation excitation on the dynamic characteristics of rotor bearing systems was studied.The dynamic model of complex rotor system based on finite element and lumped mass methods was established. In this model, the rotor was discretized by beam elements. The influences of nonlinear contact force and clearances were considered in rolling bearing analysis. The support damping ring was characterized by Kelvin-Voigt linear mechanical model. Finally,the influence of the base displacement excitation on the dynamic behavior of the system was investigated by the RungeKutta numerical method. On this basis, the dynamic parameters of the support damping ring were optimized based on the genetic algorithm. The results show that the vibration of the foundation in the horizontal or vertical direction affects the vibration of the rotor not only in this direction, but also in the other directions. When the foundation vibration frequency is not equal to the rolling bearing varying compliance(VC) frequency or its harmonic frequency, the combined resonance phenomenon of the system will occur. Meanwhile, the influence of the foundation excitation on the dynamic behavior of the system was significantly reduced after the optimization design. This paper provides a theoretical support for the analysis of the dynamics of rotor bearing systems under foundation vibration excitation.

关 键 词：振动与波 基础激励 动力学 有限元 轴承系统 

分 类 号：O241.82[理学—计算数学]