Research on Load Characteristics of Axle‐Box Bearing Raceway under Wheel‐Rail Excitation
Xiaokang Liao, Cai Yi, Fengyu Ou, Yi Zhang, Zili Chen, Jianhui Lin
Abstract
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.