Study On High Speed Maglev Train Optimum Speed Curve And Its Tracking Control

High-speed Maglev train traffic system is one of the important development directions in the future. High-speed Maglev transportation technology has been listed as major projects of "Tenth Five-Year" 863 Plan. In order to drive the Maglev train on time, safety, energy saving and comfortable automatically, the optimum speed curve of high-speed Maglev-train, its tracking control and other issues were studied, with the German high-speed Maglev-train system as the research object. The major research and innovation points are summarized below.Firstly, the non-linearity dynamic model of the running Maglev train was approximately treated using the fitting method convenient for analyzing and calculating the Maglev train running rule. The uniform non-linearity dynamic approximate model, useful to express different train system with same type and different organization, was obtained. The general expression of analytical solutions was obtained. The running rule of the Maglev train under the constant force was studied, and an iterative search algorithm was designed to calculate the control force with known running rule.Secondly, the safety speed protection curve algorithm was proposed based the dynamic model of Maglev train, and the train safety speed range was determine by systematic analysis of the limited-speed Maglev train protection. The protection measure was studied to treat the over-speed Maglev train, and the switching algorithm of eddy-current brake for protecting the Maglev train over-speed was given.Thirdly, based on the dynamic model of maglev train and bond with safe and comfortable conditions, the optimal control problems of the shortest time and the smallest energy were studied, and the practical method was given based on theoretical analysis. To the question of determining the switching sliding point under minimum energy control, two methods were given. The important foundation for drawing the operation chart was provided, for the changing energy consumption curve with the running time interval was obtained based on calculating the smallest energy consumption to different interval time.Fourthly, after linearizing the Maglev train system input-output model using feedback linearization techniques, the nonlinear compensator and nonlinear PI controller were designed. The simulation results show that the target speed curve was tracked well. Fifthly, a new structure of operation control system, with perfect function, high security and reliability was proposed based on analyzing some typical rail transportation system and its features of ATC system. The key function of traffic simulation system was designed, and the function of optimizing running speed curve was designed, based on the theory and arithmetic of optimum speed curve of high-speed Maglev train. The technology basement for drawing the operation chart of high-speed Maglev train was provided.In short, the optimum speed curve of high speed Maglev train and related research results given in this thesis has important theoretical and practical value for providing a useful reference to high-speed maglev train researching.