Research And Implementation On Suspension Control Method Of Maglev Train

As a new type vehicle, Maglev train has been put into practice successfully. It is difficult to resolve suspension control technique appropriately due to the inherent nonlinearity, instability, as well as the problem of uncertainties caused by disturbance of the electromagnetic suspension (EMS) system. The comfort and safety of Maglev train is determined mainly by its performance of magnetic suspension control. Therefore, suspension control technique is one of the most key and nuclear techniques, and then it is profoundly significant to study control technique of suspension system.In this paper, based on Maglev train, the digital suspension controller is designed, which mostly aims at the single electromagnet system (SEMS). First of all, the basic structure and principle of the SEMS are discussed as well as a mathematical model is founded and analyzed. Through the method of linearizing the equilibrium point, the author attains the state function and transfer function of the system and analyzes its controllability and observeability. Whereafter, to the inbeing of nonlinearity in EMS, fuzzy sliding mode controller is designed by integrating the excellences of fuzzy control and sliding mode controller (FSMC). The performance of FSMC, PID controller, fuzzy controller and sliding mode controller are compared and evaluated, it proved that FSMC not only enormously impairs inherent chattering of sliding mode, but has strong robust, fast response speed and without overshoot to testify the feasibility of FSMC.Secondly, according to the trait of the SEMS, the digital suspension controller is designed based on DSP (TMS320LF2407A). The hardware system and control software are done in detail. Thereinto, according to the characteristic of TMS320LF2407A, the peripheral circuit of digital suspension controller is designed; And nuclear control algorithm is digital PID to adopt assembly language modularization programming, which is simple to come true.Finally, the hardware system and control software are debugged respectively, and it is to improve and perfect the problems emerged from debugging process. The SEMS suspension experiment results reveal that the controller have satisfied requests of EMS, enhanced suspension rigidity of the system, been definite stability and robust. The SEMS has achieved steady suspension.