Motion stability of highspeed maglev systems in consideration of aerodynamic effects:a study of a single magnetic suspension system  
期刊名称  Acta Mechanica Sinica  作者  Han Wu; XiaoHui Zeng; Yang Yu  栏目  DYNAMICS, VIBRATION, AND CONTROL  摘要  In this study, the intrinsic mechanism of aerodynamic effects on the motion stability of a highspeed maglev system was investigated. The concept of a critical speed for maglev vehicles considering the aerodynamic effect is proposed. The study was carried out based on a single magnetic suspension system, which is convenient for proposing relevant concepts and obtaining explicit expressions. This study shows that the motion stability of the suspension system is closely related to the vehicle speed when aerodynamic effects are considered. With increases of the vehicle speed, the stability behavior of the system changes. At a certain vehicle speed, the stability of the system reaches a critical state, followed by instability. The speed corresponding to the critical state is the critical speed. Analysis reveals that when the system reaches the critical state, it takes two forms, with two critical speeds, and thus two expressions for the critical speed are obtained. The conditions of the existence of the critical speed were determined, and the effects of the control parameters and the lift coefficient on the critical speed were analyzed by numerical analysis. The results show that the first critical speed appears when the aerodynamic force is upward, and the second critical speed appears when the aerodynamic force is downward. Moreover, both critical speeds decrease with the increase of the lift coefficient.  英文栏目名称  DYNAMICS, VIBRATION, AND CONTROL  关键词  Highspeed maglev system;Critical speed;Aerodynamic effect;Motion stability  参考文献  1. Lee, H.W., Kim, K.C., Lee, J.:Review of maglev train technologies. IEEE Trans. Magn. 42, 19171925 (2006) 2. Dai, G.C.:600 km highspeed maglev project started in China:build a test line within 5 years. 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(in Chinese)  年  2017  卷  33  期  6  开始页码  1084  结束页码  1094  DOI  10.1007/s104090170698z  基金项目  The project was supported by the National Key ResearchandDevelopmentProgramofChina(Grant2016YFB1200602), the National Natural Science Foundation of China (Grants 11672306, 51490673), the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant XDB22020101), the National Basic Research Program (973 Program) of China (Grant 2014CB046801), and the State Key Laboratory of Hydraulic Engineering Simulation and Safety (Tianjin University).  点击率  1174  作者地址  1 Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China; 2 School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China; 3 State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Civil Engineering, Tianjin University, Tianjin 300072, China 
