Vertical-lateral integrated strategy for active control of damping coils in superconducting EDS maglev trains

Abstract

The intrinsic damping of the superconducting electrodynamic suspension system is very small and negative in some speed ranges. The electromagnetic damper based on vertical active control of the damping coils can significantly attenuate the vertical vibration of the superconducting magnet. Due to the coupling relationship between the levitation system and the guidance system, the vertical active electromagnetic damper will also have an impact on the lateral vibration reduction of the system. Based on the refined electromagnetic force calculation model considering the spatial position and posture of the superconducting magnet and the damping coil electromagnetic damper with active voltage control, this paper analyzes the suppression effect of vertical active control of the electromagnetic damper on the lateral vibration under the random rail irregularities. The lateral vibration attenuation characteristics and vibration suppression mechanism are explored through the free vibration response of the suspension unit. It was shown that at small amplitudes or high symmetry of vertical vibration on both sides, the electromagnetic damper has obviously insufficient control effect on the lateral system, so it is necessary to actively control the lateral vibration of the system. The damping characteristics analysis based on the vibration energy method and the vehicle dynamic response analysis both prove that the lateral active control with damping coils can significantly improve the lateral electromagnetic damping of the system. Considering the vertical and lateral vibration reduction needs of superconducting electrodynamic suspension systems, this paper proposes two integrated control methods by changing the voltage control strategy and adding on-off control. It is shown that the vector synthesis method is more appropriate by evaluating and comparing their damping effects.