Vibration suppression of high-temperature superconducting maglev system via semi-active suspension system

Abstract

Based on the flux pinning characteristics of non-ideal type Ⅱ superconductors YBa2Cu3O7-x, high temperature superconducting (HTS) pining magnetic levitation (maglev) is a self-stable levitation system with the merits of simple and reliable principle, friendly environment, etc. However, this maglev system is plagued by its prominent weak damping properties, which are unfavorable to the safety and comfort of the vehicle in operation under different external excitation. Therefore, the secondary suspension system should be added to this rail vehicle to enhance its damping property and its dynamic performance. This paper proposed a semi-active secondary suspension designed for the HTS pining maglev system. And this semi-active suspension can adjust the damping coefficient adaptively according to the motion state of the maglev vehicle. Moreover, an HTS pining maglev test vehicle "super maglev" is used to verify its effectiveness. Compared with the experimental and simulation results of a passive secondary suspension system, the dynamic performance of the maglev system with a semi-active suspension system is greatly improved. Furthermore, this semi-active suspension was applied to an engineering HTS pining maglev system through simulations. Eventually, through comparative analysis, the results show that the semi-active control damper controlled by PD can not only ensure the safety of passengers but also significantly improve the running stability of the vehicle, which has practical and economic advantages.