Dynamic Load Calculation Method of EMU Axle Box Bearing Based on Vehicle Dynamics

doi:10.3901/JME.2023.14.179

Abstract

Abstract: The calculation accuracy of dynamic load of axle box bearing have a great significance to bearing life evaluation. Considering the time-varying stiffness characteristics of the bearing, the bearing-vehicle-track-structure rigid-flexible coupled dynamic model of a typical high-speed EMU is established. The differences in dynamic loads of bearing calculated by bearing-vehicle-track-structure rigid-flexible coupled dynamic model and by traditional vehicle dynamic model with revolute joint are ascertained. Furthermore, the correlation between bearing stiffness and load and the distribution characteristics of dynamic stiffness of bearings are analyzed. The results show that the boundary load of bearing estimated by the coupled model are consistent with that estimated by revolute joint model under the typical track irregularities. In the presence of measured wheel irregularities, compared with the revolute joint model, the amplitudes of longitudinal, lateral and yaw load calculated by the coupled model are smaller, and the vertical and rolling load amplitudes are overall larger, and the differences are mainly concentrated in the part above 100 Hz. Besides, there is a significant correlation between vertical stiffness and vertical load of bearing. From the view of dynamic stiffness statistics, the equivalent stiffness of bearing in longitudinal, lateral, vertical, rolling and yaw direction are given, which are 4 790 MN/m, 58.8 MN/m, 4 960 MN/m, 3.44 MN·m/rad and 18.2 MN·m/rad, respectively, and it can be used for bearing modeling in traditional vehicle dynamics. The calculation method of bearing load can provide loading reference for bearing life evaluation.

Key words: EMU, axle box bearing, dynamic load, vehicle dynamics, dynamic stiffness

CLC Number:

U271

YANG Chen, CHI Maoru, WU Xingwen, LI Yixiao, ZHANG Yumei. Dynamic Load Calculation Method of EMU Axle Box Bearing Based on Vehicle Dynamics[J]. Journal of Mechanical Engineering, 2023, 59(14): 179-189.

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