基于多体动力学的圆柱滚子轴承局部损伤分析

Analysis of cylindrical roller bearing with local damage based on multi-body dynamics

为研究存在局部损伤下轴承系统的振动响应特征,基于多体动力学方法建立了可预测轴承局部缺陷尺寸、位置和形状的动力学模型,分析了缺陷参数对轴承振动的影响机理。研究结果表明,轴承的振动响应随着缺陷尺寸的增加而逐渐增大;随着缺陷位置远离最大承载区而逐渐减小;矩形缺陷的振动响应最大,三角形缺陷次之,圆形缺陷振动响应最小。通过台架试验得到圆柱滚子轴承振动响应与局部缺陷尺寸及位置的关系,并与仿真结果进行比较,验证动力学分析的合理性,为探寻轴承早期故障机理提供理论参考。

In order to study the vibration response characteristics of bearing system with local damage,a dynamic model was developed based on multibody dynamics to predict the size,location and shape of local defects of the bearing,and the influence mechanism of defect parameters on bearing vibration was analyzed.The result shows that the vibration response of the bearing increases gradually with the increase of defect size.As the position of the defect moves away from the maximum bearing area,it will gradually decrease.The vibration response of the rectangular defect is the largest,triangular defect the second,and circular defect the smallest.The relationship between the vibration response of the cylindrical roller bearing and the size and location of local defects is obtained through a bench test,and the reasonableness of the dynamic analysis are verified by comparing with the simulation results.It will provide a theoretical reference for diagnosing the early failure mechanism of bearings.