Lateral motion stability of speed-up metro vehicles under service conditions

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (3) : 304-312.

WU Junhan1,2, WEN Yongpeng1,2,3, ZONG Zhixiang4, ZHOU Yue1,2, DONG Haoliang1,2

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Abstract

The improvement of metro speed is the inevitable trend of rail transit development in the future. Wheel wear under service conditions will decrease the wheel radius and increase the equivalent conicity, which is prone to occur vehicle hunting instability.To maintain the lateral motion stability of the accelerated metro vehicles under service conditions, the wheel wear of metro vehicles on a certain line in Shanghai was obtained through investigation. The 17-DOF lateral dynamic model of metro vehicles with anti-yaw damper was established to study the influence of wheel wear on the lateral motion stability of metro vehicles. Comparison of the hunting critical velocity of vehicles with or without anti-yaw damper pointed out the necessity of installing anti-yaw damper for improving themetro speed under service conditions. It is shown that the decrease of wheel radius and the increase of equivalent conicity of metro vehicles under service conditions will reduce the critical velocity and increase the camplitude of hunting motion.The installation of anti-yaw damper can fundamentally solve the problem of insufficient lateral motion stability margin caused by wheel wear and speed increase of metro vehicles, it can also avoid the primary hunting motion of metro vehicles under abnormal parameter matching at the same time. The work of this paper has a certain reference value for improving themetro speed under service conditions and the maintenance of wheels and rails.

Key words

metro vehicles / hunting motion / equivalent conicity / anti-yaw damper / lateral stability

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WU Junhan1,2, WEN Yongpeng1,2,3, ZONG Zhixiang4, ZHOU Yue1,2, DONG Haoliang1,2. Lateral motion stability of speed-up metro vehicles under service conditions[J]. Journal of Vibration and Shock, 2023, 42(3): 304-312

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