Vibration Characteristics of High-Speed Train Axle Box Bearing with Raceway Defects Considering Track Irregularity

Axle box bearing (ABB) of a high-speed train transmits the loads and motions between the wheelset and bogie, which is essential to the operation. The ABBs may experience raceway defects during long-term operation, which threatens the running safety. The vibration signal of ABB is widely used to the condition monitoring, while it is often limited by the noise in operation. To reveal the vibration features of raceway defects, a vehicle-track longitudinal-vertical coupled dynamics model considering ABBs is established. The bearing nonlinear frictions and contact stiffness, wheel-rail interactions, and track irregularity are comprehensively considered. In the model, the raceway defect is performed by displacement excitation function. Compared to the classical bearing models, the proposed model can simulate the bearing vibration characteristics more accurately. On the basis, the vibration characteristics of ABB with raceway defects are revealed and discussed at different running speeds. Besides, the statistical indicators are used to evaluate the vibration features.