Amplitude control of the track-induced self-excited vibration in a maglev system

The EMS (Electromagnet Suspension) maglev system uses controlled electromagnetic forces to achieve suspension, and self-excited vibration may occur due to the flexibility of the track. The harmonic balance method is applied in this article to investigate the amplitude of the self-excited vibration, and it is found that the amplitude of the vibration depends on the voltage of the power supplier. Based on this conclusion, a vibration amplitude control method, which controls the amplitude of the vibration by adjusting the voltage of the power supplier, is proposed to attenuate the vibration. A P1 controller is designed to control the amplitude of the vibration at a given level. The effectiveness of this method is validated by a simulation, which shows a good prospect for its application to real maglev systems.