Study on the nonlinear dynamic model of high-speed train yaw damper

Abstract

The yaw damper for high-speed trains is one of the key suspension components, which plays a vital role in ensuring the vehicle's running stability. In this paper, the modeling process and damping characteristics of the oil unidirectional yaw damper are deeply studied, and the nonlinear dynamic model of the yaw damper is established. The comparison results of simulation and bench test show that the nonlinear dynamic model can accurately simulate the static and dynamic characteristics of the yaw damper. By changing the static damping characteristic curve of the yaw damper, the law of influence on the dynamic parameters is analyzed. The results show that simply increasing the unloading force will significantly increase the dynamic damping, and the dynamic stiffness will also increase significantly when the excitation frequency is greater than 4 Hz. And simply increasing the unloading speed reduces both the dynamic damping and the dynamic stiffness.