Dynamic response analysis of high-speed train axle box bearing by considering time-varying dynamic parameters

The dynamic parameters of high-speed train axle box bearing have time-varying characteristics, it is necessary to investigate the influence of time-varying characteristics on the dynamic response of the bearing. In this paper, based on the time-varying characteristics of the internal and external dynamic parameters of the bearing, a two-degree-of-freedom dynamic model of axle box bearing is established. The dynamic responses of bearings with different ranges of outer raceway defects are analyzed, and the similarities and differences between the varying compliance vibration and outer ring raceway defect fault vibration are compared. The results show that these two vibration modes have the same characteristic frequency, but the contact force between rollers and raceways and vibration acceleration amplitudes are greatly different. Finally, the effectiveness of the established dynamic model is verified through monitoring signal on the operation high-speed railway line.