Abstract
Repulsive magnetic levitation systems for vehicle suspensions are statically stable but dynamically of zero-or low-damping characteristics. Especially it is reported that electrodynamic suspensions have negative damping in some operating condition. In this paper, an active suspension is applied to the secondary suspension of the zero-damping magnetic levitation system in order to improve the dynamic stability of both the car body and the truck. The active suspension with a pneumatic actuator is designed by optimal regulator theory. The kinetic energy and the potential energy of both the car body and the truck are evaluated in an evaluation criterion. The two degress of freedom suspension model of this maglev system is analyzed theoretically and compared with the experimental results. The theoretical analysis and experimental results show that the dynamic stability is much improved by the active secondary suspension.
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