Research On Pseudo-Derivative-Feedback Of Suspension Controller

As a new type of conveyances, Maglev train has aroused more and more attention because of its high velocity, safety and comfort, few pollution and low noise. As to the maglev vehicle system, suspension control technology is one of the most nuclear and key techniques. The performance of magnetic suspension is determined mainly by its control system. Due to the inherent nonlinearities and open-loop instability of the magnetic suspension system, as well as the problem of uncertainties caused by parameter variety and disturbance, increase the difficulty of magnetic suspension control technology. Therefore, it has great significance to study control methods of suspension system.A new control stategy with Pseudo—Derivative—Feedback (PDF) is presented for application in electromagnetic suspension system (ESS) in this thesis. First of all, the basic structure and principle of the SMLS will be discussed as well as a mathematical model will be founded. The factors, which influence the performance of the system, will be analyzed and the relative solution will be brought. A PDF and PID controller is designed. The performance of PDF controller is evaluated, proved the feasibility of the controller.After analysis of the single magnetic levitation system (SMLS) and its control theory, the digital controller is adopted to keep suspension control. The controller is designed with the digital signal processor(DSP)-TMS320F2812. Its functions include signal sampling, signal processing based on control arithmetic and outputting the result, etc.The levitation experiment results show that the robustness, stability and disturbance suppression are verified. The SMLS's stable suspension can be obtained by using the digital controller mentioned above.