An axle box bearings coupled with a railway vehicle model was developed based on Hertz contact and elastohydrodynamic lubrication theory.The effects of wheel-rail excitations on the vibration and oil film stiffness characteristics of axle box bearings were investigated.MATLAB/Simu-link and UM were used to establish the bearing dynamic model and the railway vehicle model,respec-tively.The coupling relationship between the two was realized through the interaction force.The typi-cal fault forms of bearings and wheelsets were simulated,and the impacts of these faults on bearing vibration and lubrication characteristics were analyzed in detail.The results show that lubrication may effectively reduce bearing vibrations.The partial bearing faults may increase the oil film stiffness,and bearing faults and wheel flats have a significant impact on lubrication.In addition,wheel-rail excita-tions reduce the vibration ratio of the bearing outer ring while increasing the vibration of other vehicle components and little effects on the vibrations of the car body.
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