EMS Maglev Vehicles Vibration Mechanism And Suppression Method

Comparing to traditional railways, the EMS maglev train has obvious advantages in the aspects of climbing ability, safety, environmental protection, economy, comfort etc. It is a new type of contactless track railway transportation and has broad prospect of application in the field of rail transportation.Shanghai high-speed maglev line adopted the German TR technology and was officially in operation in 2006. Japan applied the technology of HSST. Linimo started operation in 2005 and has achieved good operating performance. After nearly 10 years of research in China, EMS technology has been applied in the middle low speed maglev train systems. The maglev railway system with independent intellectual property rights has now entered the final stage of the engineering practice. It can be predicted that the EMS maglev railway technology in China will have broad application space in the future.Because it relies on the electromagnetic force generated by the control system when the EMS maglev trains are suspended, the suspension can be influenced by many factors of vehicles and tracks, and the special phenomenon of mutual influence by maglev vehicle vibration and track vibration may occur. In spite of many years' research at home and abroad, the problems in engineering practice are not completely solved. In the Maglev Test Lines in China, there are many problems associated with the vibration of the vehicle and track system. The theoretical research is very urgent for the nationalization of maglev railway system.This paper starts from the internal mechanism of vibration of EMS maglev train system, tracks the latest developments in domestic and foreign maglev vehicle dynamics, control theory and related areas,conducts more detailed research on EMS maglev system vibration mechanism, and searches for effective solution to restrain vibration of maglev system.The key difference between EMS maglev train and traditional wheel rail is the use of electromagnetic force instead of the first suspension support force. This is the root of particular vibration problems of Maglev System. In chapter 2, single magnet suspension system is established based on the domestic and foreign research results. The static suspension process of maglev system is analyzed, with the interaction between vehicle and track coupling considered. The theoretical analysis of the inherent mechanism of vibration system is verified by numerical simulation, with discussion of the influence on system vibration by the main parameters of suspension controllers and vehicle tracks. This provides the theoretical basis for the research on vibration of the maglev system.When the maglev train is running at high speed, the factors that affect the vibration of the maglev train system are more complicated comparing to the static suspension. When the vehicles travels on the tracks at higher speed, the deformation and vibration of the tracks will be increased. The vibration of the whole system of car - suspension frame -track becomes more intense with vehicle track coupling. This causes a great impact on the stable operation of the maglev vehicles. In chapter 3,the vibration characteristics when EMS maglev train is running are studied. The influence on vibration mechanism by suspension controllers, vehicle-track main parameters is analyzed. A new method to judge the dynamic stability of the maglev train is proposed, with relevant criterion and verification by numerical simulation.These studies provide the theoretical basis for designing EMS maglev railway system.The middle low speed EMS maglev train has the characteristics of strong climbing capability. But the system stability weakens when the slope is big, due to rapid change in track curve. This affects the safety and comfort of vehicles. There are no corresponding theoretical research results for maglev rail slope track design at home and abroad. In Chapter 4, the system model is established for the maglev vehicles when changing slope point on track. The influence caused by major parameters such as vehicle speed and track curves is theoretical analyzed under two track conditions: broken line slope changing points and vertical curves. Finally, the conclusions of the theoretical derivation are verified by corresponding simulation. This study provides the theoretical basis for the design of the middle low speed EMS maglev system in the up and down slope, and also has reference value for the design of the high-speed EMS maglev system.There are many factors that cause vibration of EMS maglev train, such as the force formed at cutting air, the vibration caused by various auxiliary equipment, vehicle track coupling, and track irregularity etc.The vibration itself is inevitable due to the existence of these factors. It is a systematic project to restrain the vibration and improve the stability and comfort of the maglev train. But because the EMS maglev train is at the starting stage in the domestic application project, there's too little theoretical research and engineering practice in relevant damping technology. In Chapter 5 maglev systems track spectrum and vehicle vibration evaluation index is introduced. The basic principle of EMS maglev vehicle vibration suppression is theoretical analyzed. Numerical simulations are conducted for verification according to the vibration suppression scheme at static suspension and running condition. The study has important engineering application value for the successful operation of domestic maglev system. In summary, this paper systematically studied the inherent vibration theory of EMS maglev system, analyzed the intrinsic mechanism of the main parameters of suspension control, vehicle track interaction in the system during the vibration process, and provided concrete scheme to restrain the vibration at vehicle running and static suspension. The results fill in some blanks in the middle low-speed maglev train system research in our country and provide a theoretical basis for improving the maglev transportation system in China's nationalization.