Suspension System Simulation And Research Of Mid-Low Speed Maglev Train

Suspension system is the core component of low-speed maglev train, and it is the foundation to ensure normal operation of the train. The research on suspension system has great significance to enhance the operation stability of a maglev train. In practice, there are many external disturbance factors during the train running, such as load changes, air drag, acceleration and deceleration, turning, ramps, machining errors of the track and so on; these factors would cause interference with electromagnetic suspension. Therefore, in the design of suspension system, an accurate nonlinear model of the electromagnet levitation force should be established firstly, meanwhile the influence of various disturbing force must also be considered, and design a large range stable control strategy to improve the anti-interference ability of the overall system.This paper made a research on suspension system by mainly using software simulation technology, the research includes two parts:the finite-element analysis of electromagnetic field and the modeling and simulation of the control system. Firstly, the paper analyzes electromagnetic field with two-dimensional and three-dimensional finite element analysis by ANSOFT to the electromagnet module. From the simulation of electromagnetic force following the air gap change and the current, study the relation of electromagnetic force changing with suspension current and the air gap between rails and electromagnet; synchronously, analyze the electromagnetic field characteristics of electromagnet under static conditions occurring horizontal offset and scroll, as well as dynamic conditions. According to the simulation results, do an optimization design of electromagnet and F-rail structure, and compare the simulation results with the analytical results; then the paper does the control system modeling and simulation. Derive rigid kinetic equations, which consider the two rigid connection electromagnet modules as a whole, and establish the electromagnet suspension characteristic model for simulation combining with three-dimensional finite element analysis results. By different control strategies through simulation analysis, further guide the design of the control system to improve anti-disturbing capability, and ultimately the suspension control system can achieve stable control within the whole suspension gap.