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During acceleration, deceleration, running through railway switch, or after wheel/rail wear, high-speed trains will encounter train body resonance. At this time, the running state of the vehicle is seriously deteriorated, and the running performance of the vehicle drops sharply. For this reason, an intelligent suspension system with controllable stiffness is designed. First, a magneto-rheological(MR) damper with variable stiffness was designed, which is compact and easy to install in the vehicle suspension structure, and its performance was tested by the MTS test system. Then, a controllable stiffness suspension system structure that can be used for high-speed trains was designed, and a control algorithm that can avoid the train body lateral resonance was also designed. Finally, a vibration test of a high-speed train model was conducted on a six-degree-of-freedom motion platform to test the vibration reduction effect of the designed intelligent suspension system. The test results show that when the coil current changes from 0 to 0.9 A, the equivalent stiffness coefficient of the designed variable stiffness MR damper increases from 14.651 kN/m to 41.580 kN/m, and the equivalent stiffness increases by 2.84 times. The designed controllable stiffness suspension system can effectively avoid the lateral resonance of the train body and improve the running performance of the vehicle. Under the action of harmonic excitation, compared with passive suspension, the train body vibration acceleration of the controllable stiffness suspension is reduced by more than half. In order to better verify the practical application effect of the designed controllable stiffness suspension, random vibration excitation was applied to the high-speed train model to simulate the actual running state of the train. The test results show that the designed intelligent suspension system can greatly improve the operation of the train stability and ride comfort. Compared with passive sus-pension, the vibration acceleration of the vehicle body is reduced by 21.1%, and the ride comfort of the vehicle is improved by 27.6%. And the ride comfort level of the vehicle has been increased from "C" (Fairly uncomfortable) to "B" (Little uncomfortable).
 

high-speed train, magnetorheological, semi-active suspension, variable stiffness, resonance