基于非线性动力学的滚动轴承故障工程建模与分析

Nonlinear dynamic modeling for localized defects in a rolling element bearing

针对滚动轴承出现故障后的振动特征,根据轴承故障产生机理建立了一个6自由度故障轴承动力学工程模型。模型中充分考虑了由轴承间隙所引起的轴承非线性时变刚度和滚动体滑动等影响因素,并且引入单元谐振器模拟出现故障后轴承元件的高频固有振动。使用龙格库塔数值积分方法分别对滚动轴承外圈、内圈和滚动体局部故障进行动力学仿真和分析,结果与实验基本保持一致,表明该模型在工程应用中具有一定的准确性和实用性。

Here,a simulation model was proposed to study localized defects of a rolling element bearing.In the model,the effects of internal radial clearance,time-varying and nonlinear stiffness,and slippage between elements were taken into account.Simultaneously,a resonance changer was introduced into the model to represent a typical high frequency resonant response of the fault bearing.The dynamic equations were numerically integrated for the local defects of outer race,inner race and rolling element.The analysis results of the simulations and the experimental results showed preliminarily that the proposed model is successful.