The sliding of the rolling element in the load zone would cause the bearing’s wear and failure at high speed under elastohydrodynamic lubrication (EHL) condition. Aiming at this phenomenon, considering lubrication oil film, time-varying displacement, radial clearance, and comprehensive stiffness, a five degree-of-freedom (DOF) dynamic model of rolling bearing with local defect is proposed based on isothermal EHL and which is validated by experimental data. The variation of oil film stiffness, comprehensive stiffness, and vibration characteristics of rolling bearing is studied under different speeds and loads. The results show that the lubricating oils with different viscosities have a certain influence on the bearing oil film thickness and comprehensive stiffness. As the load increases, the oil film stiffness and comprehensive stiffness would increase, and the oil film thickness would decrease. And as the tangential speed increases, the oil film stiffness would increase, and the oil film thickness and comprehensive stiffness would decrease. The vibration amplitude of the rolling bearing is enhanced with the increase of the rotation speed and the radial load. This model is helpful for the optimization, the correct use of lubricants, and life prediction of rolling bearing.

中文翻译：

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等温弹性流体动力润滑下考虑综合刚度的局部缺陷滚动轴承五自由度动力学建模

在弹性流体动力润滑（EHL）条件下，滚动元件在负载区中的滑动会导致轴承的磨损和高速故障。针对这种现象，考虑润滑油膜，时变位移，径向游隙和综合刚度，提出了基于等温EHL的具有局部缺陷的滚动轴承五自由度动力学模型，并对其进行了验证。根据实验数据。研究了在不同速度和载荷下滚动轴承的油膜刚度，综合刚度和振动特性的变化。结果表明，不同粘度的润滑油对轴承油膜厚度和综合刚度有一定影响。随着负载的增加 油膜刚度和综合刚度会增加，油膜厚度会减少。随着切线速度的增加，油膜的刚度将增加，油膜的厚度和综合刚度将减小。随着转速和径向载荷的增加，滚动轴承的振动幅度增大。该模型有助于优化，正确使用润滑剂以及预测滚动轴承的寿命。