轮轨激励下含局部缺陷的高速列车轴箱轴承动力学仿真分析

Dynamic Simulation on Axle Box Bearing of High-Speed Train with Localized Defects under Wheel/Rail Excitation

轴箱轴承是高速列车走行部中的关键旋转部件,在复杂轮轨激励的作用下容易出现由疲劳、过载等原因导致的失效,影响列车的行车安全.采用UM/Simulink联合仿真的方式,建立了含局部缺陷的轴箱轴承-柔性轴箱-车辆系统耦合动力学模型,研究了不同工况下轴承外圈、内圈和滚子存在单一局部缺陷时系统的动力学响应,分析了轨道不平顺、车轮失圆等轮轨激励对轴箱轴承故障响应的影响.此外,通过对轴箱箱体及轴箱转臂的振动响应进行对比分析,确定了轴箱上提取故障冲击响应的最佳测点位置.相关结果对于指导高速列车轴箱轴承的状态监测和故障诊断具有一定的工程应用价值.

Axle box bearing is a key rotating component in the bogie of high-speed trains.Under complex wheel/rail excitations,localized defects caused by fatigue,overload,etc.will threaten the operation safety of railway vehicles.In this paper,a coupled dynamic model of axle box bearing-flexible axle box-vehicle system with different bearing localized defects is established using UM/Simulation co-simulation.The vibration responses of axle box with fault on outer raceway,inner raceway and roller under track irregularities and wheel ovalization are studied.In addition,the fault responses from typical points of axle box and rotary arm are compared to select the optimal mounting position of accelerometer on the axle box.The simulated results are helpful to the condition monitoring and fault diagnosis of axle box bearings in industrial applications.