Motion stability of high-speed 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; Xiao-Hui Zeng; Yang Yu
摘要In this study, the intrinsic mechanism of aerodynamic effects on the motion stability of a high-speed 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.
关键词High-speed maglev system;Critical speed;Aerodynamic effect;Motion stability
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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).
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

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