Study on Dynamic Magnet-track Relationship of Maglev Vehicles

On the basis of the theory of vehicle-guideway coupling dynamics and the law of specific levitation control,the mathematical single magnet model of dynamic levitation control was established to study the dynamic interrelation of magnet and guideway of room temperature maglev trains.The model took into consideration the influence of minor fluctuations.The dynamic relation of magnet and guideway of vehicles with different levitation control systems was studied from the perspective of vehicle-bridge interactions.Results indicate as follows:The clearance feedback coefficient has minor effect on the initial state of the maglev system;when the maglev system is subjected to external disturbances,the effect of clearance feedback coefficient on the levitation state increases and the dynamic changes of the levitation gap tend to become stable along with increasing of the clearance feedback coefficient;when vehicles run on a bridge,the levitation gap remains fluctuating and the fluctuations reach their peak values at the entry and exit of the bridge,the dynamic levitation gap is in direct proportion to the vehicle velocity and the loads of vehicle are in direct proportion to the bridge fluctuating amplitudes;when the vehicle velocity exceeds 250km/h,the influence of the vehicle speed on the dynamic levitation gap increases rapidly and the changes of coil currents and electromagnetic levitation forces are consistent with the changes of the levitation gap.