The Research of Vibration Reduction of EMS Maglev Vehicles Based on Semi-active Control

In order to study the vibration reduction method of EMS (Electromagnetic Suspension) maglev train, a dynamics model of the vehicle-track of the magnetic levitation system is established. The 3 kinds of semi-active control method to vehicle body vibration is analyzed and compared, and a semi - active control method is proposed, which is based on the acceleration damping as the supplement of the velocity damping in the control of the sky - hook. The analysis shows: (1) Semi active control is adopted in the two series suspension, which can effectively restrain the vibration of the car body of EMS maglev system, the effects is better than passive suspension system. (2) Two series suspension with different methods of vibration reduction will have an impact on the vibration of the suspension frame. (3)When the vertical vibration of the vehicle body is reduced by semi active control, the force of the two series suspension transmission to the suspension frame can be reduced, and the suspension frame vibration can be reduced to a certain extent. (4) Acceleration damping is adopted as the supplement of the velocity damping in the control of the sky hook, the calculation speed is fast, and the performance is close to that of the LQR semi-active control, the method is simple and suitable for application in engineering.