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The function of the hydraulic damper of the high-speed Multi-Electric-Units (EMUs) is to offer viscous damping to reduce the vibrations and to keep the stability of the vehicle. It is the key component and it has great effects on the high-speed EMU dynamics. A new hydraulic damper dynamics model including two clamping points stiffness, a viscous damping and two centralised masses, is presented in this paper. A high-speed vehicle–track interaction dynamics model is developed, in which the new hydraulic damper dynamics model is introduced in it to investigate the damper and vehicle dynamics. With numerical simulation, the clamping point loads and damping forces of four types of dampers of the vehicle are obtained. The reliability of the new damper dynamics model is validated with comparison between the simulation results and the field test results. The availability of the new damper dynamics model is confirmed with the comparison of the results between a simplified damper dynamics model and the new damper dynamics model for two types of high-speed EMUs in China. With the help of the new damper dynamics model, the optimised clamping point stiffness of the dampers and the effect of the damper mass on the vehicle system dynamics are discussed. The investigation results show that the vibration difference between the damper and the connected components of the vehicle could be obtained.

A new hydraulic damper dynamics model and the availability on high speed vehicle dynamics investigation