Motion stability of high-speed maglev systems in consideration of aerodynamic effects: a study of a single magnetic suspension system  

作　　者：Han Wu Xiao-Hui Zeng Yang Yu 

机构地区：[1]Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences [2]School of Engineering Science, University of Chinese Academy of Sciences [3]State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Civil Engineering, Tianjin University

出　　处：《Acta Mechanica Sinica》2017年第6期1084-1094,共11页力学学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(Grant 2016YFB1200602);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);the State Key Laboratory of Hydraulic Engineering Simulation and Safety (Tianjin University)

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.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 

分 类 号：U237[交通运输工程—道路与铁道工程] U266.4[机械工程—车辆工程]