A bearing-vehicle-track coupling dynamic model is built in this paper and the validity of the model is proved by comparing the simulation data with the theoretical data. Based on this model, the influence of wheel diameter difference (WDD) on the dynamic behavior of wheelset bearing is studied. The results demonstrate that when the bogie has a rear WDD, lateral displacement (LaD) of the front wheelset is the smallest. When the bogie has an anti-phase WDD, LaD of the rear wheelset is the smallest, while when the bogie has an in-phase WDD, LaD of the front and rear wheelsets is the largest, and LaD of the front and rear WDD is between the two, which is in line with the theoretical analysis results. Compared with LaD results of the wheelset bearing outer raceway under normal conditions, when the wheel has a diameter difference, LaD distance of the outer race increases with the WDD increasing, and the frequency of lateral movement also increases with the increase against the WDD gradation. The high-frequency and large-distance lateral movement of the wheelset bearing outer race under the WDD will increase the roller-outer raceway force, and accelerate the failure of the bearing.

中文翻译：

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轮径差异引起的轮对轴承动态行为的仿真研究

本文建立了轴承-车辆-轨道耦合动力学模型，通过仿真数据与理论数据的对比，证明了模型的有效性。基于该模型，研究了轮径差（WDD）对轮对轴承动态行为的影响。结果表明，当转向架为后轮驱动时，前轮对的横向位移（LaD）最小。当转向架为反相WDD时，后轮对的LaD最小，而当转向架为同相WDD时，前后轮对的LaD最大，前后WDD的LaD为介于两者之间，符合理论分析结果。与正常情况下轮对轴承外滚道的LaD结果相比，当车轮存在直径差时，外圈的LaD距离随着WDD的增加而增加，横向移动的频率也随着WDD级配的增加而增加。轮对轴承外圈在WDD作用下的高频、大距离横向运动，会增加滚子-外滚道力，加速轴承的失效。