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The effect of external dynamic loads on the lifetime of rolling element bearings: results of accelerated lifetime tests

机译：外部动态载荷对滚动元件轴承寿命的影响：加速寿命试验的结果

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Accurate prediction of the lifetime of rolling element bearings is a crucial step towards a reliable design of many rotating machines. Recent research emphasises an important influence of external dynamic loads on the lifetime of bearings. The loads can result from structural resonances, gear meshing, etc. Lifetime calculations of bearings are based on the classical ISO 281 standard, neglecting their influence. Inaccurate estimations of the lifetime lead to excessive safety factors during design and unexpected failures during operation. This paper analyses the influence of external dynamic loads using a novel bearing test rig. The test rig allows applying static and dynamic loads on the test bearing in both the radial and axial direction. During dynamic excitation of the test bearing, increased frictional power loss is measured based on the bearing temperature. The measurements reveal the bearing operational conditions (static loads, dynamic loads and speed) at which wear due to external dynamic loads is expected to be maximal. Accelerated lifetime tests are afterwards performed in these conditions. The effect of radial, axial and combined radial and axial dynamic loads is separately investigated. Microscope images reveal the effect of dynamic loads on wear of the raceway surfaces.
机译：滚动元件轴承寿命的精确预测是朝向许多旋转机器可靠设计的关键步骤。最近的研究强调了外部动态载荷对轴承寿命的重要影响。载荷可能由结构谐振，齿轮啮合等产生。轴承的终身计算基于经典ISO 281标准，忽略其影响。在操作期间，寿命的不准确估计导致设计和意外故障的安全因素过度安全。本文采用新型轴​​承试验台分析了外部动态载荷的影响。试验台允许在径向和轴向上施加在测试轴承上的静态和动态载荷。在动态激励在试验轴承期间，基于轴承温度测量增加的摩擦力损耗。测量显示轴承操作条件（静电负载，动态载荷和速度），在此引起的外部动态载荷预计将是最大的。随后在这些条件下进行加速寿命测试。径向，轴向和组合径向和轴向动态载荷的效果分别研究。显微镜图像揭示了动态载荷对滚道表面磨损的影响。

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