Study on Magnetically Coupled Vibration and Control of Electrodynamic Suspension System

磁悬浮（MAGLEV）车辆系统已被研究用于未来的高速运输。研究汽车的动态特性对汽车高速行驶的稳定性、安全性和平顺性具有重要意义。研究了采用电动悬浮（EDS）的排斥型磁浮列车系统的动力学特性。由于电动悬架具有固有的稳定性和低阻尼特性，在悬浮体运动时容易发生机械共振。此外，由于其在导轨上的线圈或片材中使用导电涡电流，因此排斥力受到位于纵向方向上的相邻磁体产生的磁场的影响。本文研究了铝制旋转平板上两个独立的永磁体和电磁体悬浮体之间的磁耦合特性以及在平板上运行的两自由度悬浮体的升沉和俯仰运动的动力学特性.计算机仿真和实验结果表明，两个永磁体之间的距离对悬浮体的后悬浮间隙和磁刚度有影响，并且通过附加的有源控制电路大大提高了动态稳定性。

Magnetically levitated (MAGLEV) vehicle systems have been researched for future high speed transportation. It is specially important to investigate dynamic characteristics for running stability, safety and ride quality at high speed. This paper deals with dynamic characteristics of repulsive type MAGLEV systems using electro-dynamic suspension (EDS). As the electrodynamic suspension is inherently stable but of low damping character, mechanical resonance is liable to occur in levitated body motions. Moreover, as it uses conductive eddy current in coils or sheets on guideway, the repulsive force is influenced by magnetic field generated by adjacent magnets located in longitudinal direction. This paper investigates magnetic coupling characteristics between two independent levitated bodies with a permanent magnet and an electromagnet above an aluminum rotating plate and dynamic characteristics of heave and pitch motions of two-degree-of-freedom levitated body running above the plate.The computer simulation and experimental results clearly show that the rear levitation gap and magnetic stiffness are influenced by the distance between the two magnets, and that the dynamic stability is greatly improved by the additional active control circuit.