Application Research on H∞ Controlled Variable Stiffness Suspension System of High-speed Train

doi:10.3901/JME.2022.08.204

Abstract

Abstract: Aiming at the lateral resonance problems encountered by high-speed trains in working conditions such as acceleration and deceleration, passing through switches, wheel/rail wear, and entering and exiting stations, a variable stiffness suspension system based on H∞ control strategy that can suppress the train resonance was proposed, aiming to better suppress the vehicle vibrates laterally and improves its ride comfort and running stability. First of all, two compact magneto-rheological shock absorbers with variable stiffness, which are easy to be installed in the vehicle suspension system, were designed, and their performance was tested by MTS testing machine. Then, a 1/8 scale model of a rail vehicle and its controllable stiffness suspension system were designed, and a vibration test platform for high-speed trains was built. Subsequently, based on the H∞ control algorithm, a control strategy that can suppress the lateral resonance of the train body was designed. Finally, the experimental tests of passive suspension and controllable stiffness suspension systems were carried out, and the results were compared and analyzed. The results show that the designed magnetorheological shock absorber has excellent stiffness controllable performance, and the stiffness variation range reaches 2.84 times. The designed variable stiffness suspension based on the H∞ control strategy can not only effectively suppress the lateral resonance of the train body, but also reduce the acceleration of the train body under harmonic excitation by 52.8% compared with the passive suspension. Compared with passive suspension, the vibration damping performance and ride comfort of the train under random excitation have increased by 21.1% and 27.6%, respectively, and the ride comfort level has been improved from C-level to B-level.

Key words: high-speed train, intelligent suspension, magnetorheological, variable stiffness, resonance

CLC Number:

U270

JIN Tianhe, ZHANG Zhi, LIU Zhiming, SUN Shuaishuai, YIN Liyun. Application Research on H∞ Controlled Variable Stiffness Suspension System of High-speed Train[J]. Journal of Mechanical Engineering, 2022, 58(8): 204-214.

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