含局部故障的滚动轴承动力学建模及振动分析

基于ANSYS/LS-DYNA软件建立了健康圆柱滚子轴承的二维显式有限元模型，并从轴承运动学的角度验证了本文所建有限元模型的有效性.在健康圆柱滚子轴承模型中引入利用圆周矩形模拟的内、外滚道局部剥落故障，建立含局部剥落故障的圆柱滚子轴承有限元模型，分析了故障区边缘单元的等效应力和滚子滚过内外圈局部缺陷的过程.将仿真结果与实验测试结果对比分析，证明了本文所建立的含局部剥落故障的圆柱滚子轴承有限元模型的正确性.在此基础上，研究了局部故障区域平滑程度对滚动轴承振动特性的影响，故障区域越平滑，振动响应越小.研究结果可为滚动轴承故障诊断提供一定参考.

Dynamic Modeling and Vibration Analysis of Rolling Bearings with Local Fault

A two-dimensional explicit finite element (FE) model of healthy cylindrical roller bearings based on ANSYS/LS-DYNA software was established， and the availability of model was verified from the perspective of bearing kinematics. The FE model of cylindrical roller bearing with local spalling fault was developed by introducing local spalling fault into healthy inner and outer raceway， among which the local spalling was simulated by circumferential rectangle. The equivalent stress of the edge element of fault zone and the process of rolling through the local fault zone were analyzed. Comparing the simulation results with the experimental ones， the correctness of the FE model was confirmed. On this basis， the influence of smoothness of the local fault on the vibration characteristics of the rolling bearing was studied. The smoother the fault area， the smaller the vibration response. These results can provide some reference for the fault diagnosis of rolling bearings.