Study on High-speed Railway Wheel/rail Non-steady-state Rolling Contact

Based on the Kalker three-dimensional rolling contact exact theory and the study of creep force characteristics under single spin creepage harmonic vibration, the corresponding non-steady state transfer function was fitted, and the non-steady state rolling contact problems with both spin and longitudinal creepages were studied considering the effects of time-dependent wheel/rail contact elastic displacement gradient and complex wheel/rail creepage conditions. The results show that the creep force phase lag compared with creepage is found in the calculation result by non-steady-state rolling contact method. With the decrease of creepage harmonic wave ratio L xi/a the greater the decrease of the creep force amplitude gain and the more phase lag. Using the non-steady state transfer function method to calculate the creep force magnitude and phase consistent with the Kalker three-dimensional rolling contact exact theory method. And the longitudinal creepage also has effect on transfer function of spin creepage/lateral creep force.