超导EDS列车磁屏蔽轻量化设计及对车辆动力学特性的影响OA

Superconducting electrodynamic suspension(EDS)trains achieve stable operation with large air gaps through the steady-state strong magnetic fields generated by onboard superconducting magnets.However,the intense high magnetic fields pose safety risks to passengers,necessitating the application of magnetic shielding structures.Existing research on shielding design primarily focuses on satisfying magnetic safety limits inside carriages and lightweight requirements.However,the correlative impact on vehicle dynamic performance remains unexplored yet.To systematically reveal the intrinsic relationship between electromagnetic compatibility(EMC)and dynamics in EDS systems,this study established a multi-physical field coupling model integrating magnetic,electrical,and mechanical interactions for the train-track system.The model quantitatively analyzed how the mass of shielding structures influences vehicle dynamic behavior.In the research on magnetic shielding structures,a lightweight optimized double-layer shielding scheme was proposed.Post-optimization,the mass of the shielding structure per suspension unit is reduced to 753.6 kg,equivalent to 81.53%of Japanese counterparts according to the literatures,effectively achieving weight reduction goals.By using a co-simulation platform combining MATLAB/Simulink and SIMPACK,both a Newtonian mathematical model and a 3D dynamic simulation model were developed.Comparative analyses in both time and frequency domains reveal significant deteriorations in vehicle dynamics due to the shielding structure.A decrease in superconducting magnet levitation height and an increase in pitch angle;a 40.2%rise in the vertical acceleration peak,a 17.1%increase in root mean square(RMS)value,and a 3.7%degradation in vertical ride comfort for car2.In terms of vibration frequency characteristics,both low-frequency vibrations around 1 Hz and high-frequency vibrations above 100 Hz exhibit varying degrees of deterioration.Moreover,vertical vibration responses exhibit speed-dependent characteristics,transitioning from attenuation at low speeds to amplification at high speeds.This research provides critical theoretical foundations for the collaborative optimization of electromagnetic compatibility(EMC)and dynamics in EDS train design.