The resilient wheel can effectively reduce the high-frequency vibration and impact between the wheel and rail to the vehicle carbody, and reduce the wheel-rail noise, which is widely used in light rail transit. At present, resilient wheels have extensively applied in trams with good vibration and noise reduction effect. However, in the practical application process, the sluggish movement of resilient wheels has frequently happened and affected the safety of vehicle operation. In order to solve this problem, this paper studies the causes of various kinds of wheel slide problems, and finally puts forward the solutions and suggestions.
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.
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