磁悬浮车辆／轨道系统动力学研究

In the past thirty years, the research and development (R&D) in maglev technology had made a great progress. Nowadays, German Transrapid maglev train and Japanese MLX01 and HSST-100 maglev train are ready to the revenue application. Moreover, China has developed low-speed EMS (electromagnetic suspension) maglev technology since the early 1980s. Few low-speed maglev demonstration lines had been constructed in the last few years. And Shanghai high-speed maglev train adopting the German Transrapid system began test run on January, 2003. Based on the foregoing R&D in maglev technology, which shows the prospective application of maglev train in the 21st century, this project investigates maglev vehicle system dynamics for the first time in China. The purpose of the project is to reveal the mechanic characteristics of electromagnetic suspension, to investigate the dynamic interaction between maglev vehicle and the elevated-guideway, to evaluate ride quality and curve negotiation performance of maglev vehicle, and to obtain the guidelines of optimization design of maglev vehicle/guideway dynamic system.In this project, studies on magnet/rail relationship, interaction between maglev vehicle and elevated-beam guideway, random vibration of maglev vehicle and ride quality, lateral dynamics of maglev vehicle and curve negotiation, and crosswind stability of maglev train are carried out by means of theoretical analysis and numerical simulation. The main conclusions are as follows: ① the electromagnetic suspension stiffness and damping is in direct proportion to the feedback coefficient of air gap and its derivative respectively; and they are related to the suspension mass. The suspension stiffness of single electromagnet of Chinese low-speed EMS maglev vehicle approximately equals to 106N/m on the nominal operation point, and the suspension damping is about 105N.s/m. While three eigenfrequencies--frequencies of the suspension controller, elevated-beam and the secondary suspension of maglev vehicle--are equal or very close to each other, the maglev vehicle/guideway system is liable to occur resonance, so it is suggested that three system frequencies should keep enough distance. ② when German TR06 maglev vehicle runs over Emsland elevated-guideway (single-span concrete beam and two-span steel beam) with 25m span at vehicle speed less than 400km/h, dynamic responses of car body and guideway increase slowly with the speed, the acceleration of car body is less than 0.125g (the allowance value of ICE wheel-rail vehicle); but dynamics responses will increase rapidly if the speed is lager than 400km/h. Furthermore, comparative analyses between maglev vehicle (TR06)/guideway interaction and wheel-rail vehicle (JR300)/bridge interaction show that the dynamic responses of TR06 is much less than that of JR300, and dynamic effect of TR06 on small span (less than 22m) beam is smaller than that of JR300, but to the medium-long span beam, the case is opposite. So the small span beam is suitable to maglev guideway structure. ③ Compared with conventional rail irregularities, random irregularities of maglev guideway embodies smaller irregularity in less than 3m and above 60m wavelength range. So a three-subsection PSD (Power Spectral Density) function of random irregularities is introduced to maglev guideway. Simulation results show that the dominant frequencies of TR06 carbody vibration range from 0.5Hz to 1Hz, and 3Hz to 6Hz for the elevated-beam guideway. Periodic configuration of the piers in the same 25m longitude distance results in a 2.2Hz frequency peak in vehicle dynamic responses. When the speed of maglev vehicle is less than 450km/h, carbody acceleration PSD satisfies the UTACV (Urban Tracked Air-Cushion Vehicle) ride quality criteria, and the Sperling ride index of maglev vehicle is less than 2.5 that indicates ride quality of maglev vehicle is excellent. ④ the active guidance of maglev vehicle can improve evidently lateral dynamic performances. Meanwhile, electromagnetic suspension forces have little change. It is suggested that Chin

磁浮列车是21世纪极具竞争力的高速地面载运工具,磁浮车辆与轨道动态相互作用直接影响鸥∠低吃诵邪踩院褪媸市浴１鞠钅恳源殴旃叵滴诵模捎梅抡婧褪匝榉椒ㄌ剿鞔鸥〕?轨系统相互作用规律，研究磁浮车辆超高速运行稳定性、平稳性及曲线通过特性，并提出青城磁浮车/轨系统参数最优动态设计准则，为我国高速磁浮列车应用提供理论指导。..