常导磁浮列车动态磁轨关系研究

Study on Dynamic Magnet-track Relationship of Maglev Vehicles

研究常导磁浮列车动态磁轨关系,从车辆-轨道耦合动力学思想出发,结合特定悬浮控制规律,建立考虑微小波动时的单磁铁动态悬浮控制数学模型;通过悬浮控制的磁浮车辆-轨道的相互作用研究具有特定悬浮控制系统的车辆在运行过程中的动态磁轨关系。研究结果表明:间隙反馈系数对悬浮系统的初始状态影响很小;当系统受到外界激扰时,间隙反馈系数对悬浮状态影响变大,随着间隙反馈系数的增大,悬浮间隙的动态变化趋于稳定;车辆在桥梁上运行时,悬浮间隙一直处于波动状态,且车辆在进、出桥梁时波动最大,动态悬浮间隙与车速成正比,车辆载重与桥梁振动幅度成正比。当车速超过250km/h后,动态悬浮间隙受车速的影响迅速增大,磁轨关系的线圈电流、电磁悬浮力的变化与悬浮间隙变化基本一致。

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 250 km/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.