Affiliations: [a] Maglev Transportation Engineering R&D Center, Tongji University, Shanghai, China | [b] School of Electrical Engineering, Southwest Jiaotong University, Chengdu, China | [c] Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu, China
Abstract: When the maglev train is running on the guideway, the coupling effect between the vehicle and the guideway will inevitably cause vibration. Especially when the guideway is flexible, the vibration of the vehicle will cause slight deformation of the guideway, which may cause resonance. The irregularity of guideway geometry is the main source of excitation for vehicle random vibration. On the premise that the guideway irregularities cannot be eliminated objectively and thoroughly. In order to analyze its vertical random vibration, the vehicle adopts the two stage suspension model, the guideway adopts the Euler–Bernoulli simple supported beam model, and the random irregularity of the guideway itself is used as the vibration source to control. At present, the power spectrum method based on random vibration theory is generally regarded as the most reasonable method, but the computational efficiency problem brought by this method has always been the bottleneck of random vibration analysis. Therefore, from the point of view of computational mechanics, the pseudo excitation method (PEM) is used to simplify the calculation of random vibration and to calculate random vibration. The coupled motion equations of the maglev vehicle under random excitation are obtained, and the computational efficiency is greatly improved. In addition, the vehicle suspension state is simulated at different operating speeds, and the effect of feedback control parameters on the stability of the magnetic levitation system is proved by numerical simulation. Finally, the influence of random excitation on vehicle guideway coupling vibration and the reliability of levitation control performance under random excitation are verified by experiments.
Keywords: Maglev system, random irregularity, the pseudo excitation method, dynamic characteristics, coupled vibration
