With the increasing speed of high-speed trains, the service conditions of axle-box bearing system worsen, and meanwhile, the dynamic performance of the axle-box bearing directly affects the operational safety. However, the dynamic interactions of the axle-box bearing in the traditional vehicle-track system are often ignored. In this paper, a vehicle-track coupling dynamic model considering axle-box bearing has been built, and the effectiveness of the model is proved by field tests. Dynamic performance of the axle-box bearing has been analyzed and discussed through numerical simulations under different working conditions. Comparing the roller-raceway contact load characteristics under different working conditions, results show that the peak values of roller-outer raceway contact load with wheel-polygonal excitation are basically the same with those without wheel-rail excitation. However, most of the peak values of roller-outer raceway contact force under track irregularity and comprehensive excitation conditions are far greater than those under wheel-polygonal excitation and no wheel-rail excitation conditions, which indicates that the impact of track irregularity on the contact load is dominant.

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轮轨激励下轴箱轴承滚道载荷特性研究

随着高速列车的提速，轴箱轴承系统的使用条件不断恶化，同时轴箱轴承的动态性能直接影响到运行安全。然而，传统车辆-轨道系统中轴箱轴承的动态相互作用往往被忽视。本文建立了考虑轴箱轴承的车轨耦合动力学模型，并通过现场试验验证了模型的有效性。通过数值模拟，对轴箱轴承在不同工况下的动态性能进行了分析和讨论。比较不同工况下滚子-滚道接触载荷特性，结果表明，车轮多边形激励下滚子-外滚道接触载荷峰值与无轮轨激励下的峰值基本相同。然而，在轨道不平整度和综合激励条件下，滚子-外滚道接触力的大部分峰值远大于车轮多边形激励和无轮轨激励条件下的峰值，这表明轨道不平整度对接触面的影响负载占主导地位。