考虑端齿连接的转子-滚动轴承系统非线性振动特性研究

STUDY ON NONLINEAR VIBRATION CHARACTERISTICS FOR THE ROTOR-ROLLING BEARING SYSTEM WITH CURVIC COUPLINGS

为了研究滚动轴承支撑下端齿连接转子系统的接触效应,采用三维有限元与解析法相结合推导了端齿连接刚度矩阵,建立了端齿连接转子-滚动轴承系统动力学模型,并通过Ansys验证了模型的有效性。通过与连续转子对比发现,端齿结构使转子一阶临界转速降低了5%,振幅增大了3%,非线性分岔趋势与连续转子大致相同。然而,端齿接触特性使转子明显地提早进入和离开拟周期运动,在分析含端齿结构的转子振动特性时应考虑接触效应。在转速超过15900 r/min时,转子系统做稳定的单周期运动,运行平稳,可作为工作转速合理设计阈值。研究可为含端齿结构转子系统非线性振动特性预测和工作转速设计提供分析方法和设计思路。

To study the contact effect of the rotor system with curvic couplings under rolling bearing supports,the combination of 3D finite element and analytical method were used to derive the curvic coupling shaft section stiffness matrix,and the dynamics model of rotor-rolling bearing system was established,which was verified by Ansys.By comparing with the continuous rotor,it was found that the curvic coupling structure reduced the first-order critical rotor speed by 5%and increased the amplitude by 3%.The results show that the nonlinear bifurcation trend of the curvic coupling rotor is nearly the same as that of the continuous rotor,however,the discontinuous characteristic of the curvic coupling structure will make the rotor access or leave the periodic motion state significantly earlier.Obviously,the contact effect needs to be considered when analyzing the rotor vibration characteristics with curvic couplings.The research can provide analysis methods and design ideas for the prediction of nonlinear vibration characteristics and the operating speed design for rotor system with curvic coupling structure.