Rolling element bearing is a very important part of mechanical equipment and widely used in rotating machinery. Rolling element bearings could appear localized defects during the working condition, which would cause the complex vibration response of bearings. Considering the shaft and bearing pedestal, a 4 degree-of-freedom (DOF) dynamic model of rolling bearing with compound localized fault is established based on time-varying displacement, and the vibration characteristics of rolling bearing with localized faults under different conditions are investigated. The established model is verified by the experimental vibration signals in time domain and frequency domain. The results show that the vibration response of compound fault is the result of the coupling action of a single fault of rolling element and outer race. The influences of compound fault on the vibration signals of the bearing were analyzed under three conditions. With the increasing of radial load, defect size, and rotation speed, the vibration amplitude of bearing would increase correspondently, which would accelerate the failure rate of bearing and reduce the service life of bearing. This model is helpful to analyze the vibration response of the rolling element bearing with single or compound fault.

中文翻译：

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滚道与滚动体复合故障滚动轴承的动力学建模与分析

滚动轴承是机械设备的重要组成部分，广泛用于旋转机械中。滚动轴承在工作状态下可能会出现局部缺陷，这将导致轴承产生复杂的振动响应。考虑轴和轴承座，基于时变位移建立复合局部故障滚动轴承的四自由度动力学模型，研究了不同条件下局部故障滚动轴承的振动特性。 。通过时域和频域的实验振动信号验证了所建立的模型。结果表明，复合故障的振动响应是滚动体单个故障与外圈的耦合作用的结果。分析了三种条件下复合故障对轴承振动信号的影响。随着径向载荷，缺陷尺寸和转速的增加，轴承的振动幅度会相应增加，这会加速轴承的故障率并降低轴承的使用寿命。该模型有助于分析具有单一或复合故障的滚动轴承的振动响应。