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首页> 外文期刊>Proceedings of the institution of mechanical engineers >A numerical investigation of effects of defect edge discontinuities on contact forces and vibrations for a defective roller bearing
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A numerical investigation of effects of defect edge discontinuities on contact forces and vibrations for a defective roller bearing

机译：缺陷边缘不连续性对缺陷滚动轴承的接触力和振动影响的数值研究

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摘要

Vibration characteristics of a roller bearing caused by a roller passing over the defect on the races are determined by the contact forces between the roller and races of the bearing. The vibration characteristics and contact forces are determined by the sizes and edge discontinuities of the defect. Therefore, it is very useful to investigate the relationships between defect edge discontinuities and the contact forces, and those between defect edge discontinuities and the vibrations for diagnosing the defects with different edge discontinuities in the roller bearings. A dynamic nonlinear finite element model for a roller bearing with a localized surface defect considering different edge discontinuities on its outer race is developed using an explicit dynamics finite element software package in this work. The effects of the defect edge discontinuities, radial load, and shaft speed on the contact force between the roller and outer race of the roller bearing are investigated, as well as the vibrations of the bearing. In-depth analyses of the contact forces between the roller and localized surface defect with different edge discontinuities are presented, which did not study in the previous literatures. The numerical results show that the number of the impacts between the roller and end edge of the defect caused by the re-stressing is more than that between the roller and beginning edge of the defect caused by the de-stressing, which is also affected by the defect edge discontinuities.
机译：由滚子越过滚道上的缺陷所引起的滚子轴承的振动特性由滚子和轴承的滚道之间的接触力决定。振动特性和接触力取决于缺陷的大小和边缘不连续性。因此，研究缺陷边缘不连续性和接触力之间的关系，以及缺陷边缘不连续性和振动之间的关系对于诊断滚动轴承中具有不同边缘不连续性的缺陷是非常有用的。在这项工作中，使用显式动力学有限元软件包，开发了一种考虑到其外圈上不同的边缘不连续性而具有局部表面缺陷的滚动轴承的动态非线性有限元模型。研究了缺陷边缘不连续性，径向载荷和轴速度对滚子与滚子轴承外圈之间的接触力以及轴承振动的影响。提出了对辊和具有不同边缘不连续性的局部表面缺陷之间的接触力的深入分析，这在以前的文献中没有进行研究。数值结果表明，再应力对辊子与缺陷的端边之间的影响要大于反应力对辊子和缺陷的起始端之间的影响，这也受到应力的影响。缺陷边缘不连续性。

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