转子-不对中花键联轴器系统动力学特性研究

Dynamic behavior of a rotor-misaligned spline coupling system

推导了花键联轴器不对中啮合力模型,基于有限元分析建立了考虑花键联轴器不对中效应的转子系统动力学方程,数值计算模拟出不对中啮合力对转子-花键联轴器系统动力学特性影响规律。理论分析和仿真结果表明:花键联轴器不对中啮合力与联轴器的结构参数、传递扭矩、静态不对中和动态振动位移等有关,且联轴器的刚度并非一个恒定的常数,其与动态振动位移有关,并依赖于静态不对中。系统动力学特性表现为:花键联轴器连接的转子系统没有不对中时,系统的响应以1倍频为主;存在不对中时,响应出现2倍频;不对中量增加时,响应的轴心轨迹偏离原点,且各频率成分的幅值增加,系统的振动变得复杂。研究结果可以为花键联轴器连接的转子系统的不对中故障诊断提供依据。

Meshing force model of a misaligned spline coupling was derived,dynamic equation of a rotor system considering influence of misaligned spline coupling was established based on finite element analysis.The influence of the meshing force on the rotor-spline coupling system was simulated with numerical integration method.Theoretical analysis and simulation results showed that meshing force of a spline coupling is related to its structural parameters,transmitted torque,static misalignment,dynamic vibration displacement,and so on;stiffness of a coupling is not a constant,it relates to dynamic vibration displacement and depends on static misalignment.Dynamic behavior of a rotor-spline coupling system revealed that 1X-rotating speed is the main frequency of the system response when there is no misalignment;while 2X-rotating speed appears with some misalignment;moreover,when misalignment increase,the shaft center orbit deviates the origin and magnitudes of all frequency components arise,the system vibration becomes complex.This research results can provide a reference for trouble-shooting of rotor systems connected with spline coupling.