Study on Magnetically Coupled Vibration and Control of Electrodynamic Suspension System

磁悬浮（MAGLEV）车辆系统是未来高速交通的研究方向。研究车辆的动态特性对高速行驶的稳定性、安全性和平顺性具有重要意义。本文研究了采用电动力悬架（EDS）的排斥式磁悬浮系统的动态特性。由于电动悬架具有固有的稳定性和低阻尼特性，在悬浮体运动中容易发生机械共振。此外，由于导轨上的线圈或片状采用导电涡流，排斥力受纵向相邻磁体产生的磁场影响。本文研究了铝旋转板上两个独立的永磁体和电磁铁之间的磁耦合特性，以及在铝旋转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清楚地表明，后悬浮间隙和磁刚度受两个磁体之间距离的影响，并且通过附加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.