Research on Active Control Method and Adaptability of Low-frequency Sway of High-speed Vehicle

doi:10.3901/JME.2025.12.226

Abstract

Abstract: Aiming at the lateral low-frequency sway issue of high-speed EMUs under the condition of low equivalent conicity, the active lateral secondary suspension control methods and its adaptability are studied to improve the ride quality and track adaptability of the vehicle. The paper establishes a dynamic and control model of the active suspension system of a high-speed vehicle, and simulates the low-frequency lateral sway characteristics of the vehicle. According to the principle of sky-hook damping and modal control, various semi-active and fully-active control strategies are designed. The car body lateral vibration modal damping control is proposed as well as the sky-hook velocity-difference damping control method based on relative vibrating velocity difference between car body and bogie frame, then their differences with respect to the PID, traditional sky-hook damping and acceleration damping control methods are compared. The control effects on ride quality, hunting motion stability and running safety are discussed. The critical time delay allowed by active control is analyzed as well as the influence of vehicle speed and track irregularity amplitude. The simulation results show that the control effects of modal damping and sky-hook velocity-difference are good. They can not only suppress the low-frequency vibration of the vehicle, but also significantly suppress the low-frequency vibration of 1-2 Hz during normal operation of the vehicle, and have good adaptability to vehicle speed. Under the normal running and low-frequency sway conditions of the vehicle, the active control reduces the lateral ride quality index by 29.4% and 47.5%, respectively. As the speed increases, the critical time delay allowed by active control decreases linearly, and the sensitivity of different control strategies to the time delay is significantly different, the larger the track irregularity amplitude is, the smaller the critical time delay allow.

Key words: high-speed train, low-frequency sway, vehicle dynamics, active suspension, time delay, co-simulation

CLC Number:

U270

LIU Zhiqiang, SHI Huailong, LIU Yanxiu. Research on Active Control Method and Adaptability of Low-frequency Sway of High-speed Vehicle[J]. Journal of Mechanical Engineering, 2025, 61(12): 226-240.

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