Research On Levitation Control System And Dynamic Modeling Of EMS Maglev Train

The high-speed maglev train is one of the important transportation systems in the post-high-speed rail era.It can compensate for the speed difference between the high-speed rail and the aircraft,and has become one of the new hot spots in rail transit research.Different from traditional wheel-rail trains,EMS maglev trains are based on the principle of mutual attraction between electromagnets and rails under active control,so as to achieve stable levitation and ensure the smooth running of the train.The EMS maglev train has the advantages of fast speed and low energy loss,making it gradually become one of the research focuses of experts and scholars at home and abroad.This paper takes the single-iron suspension model as the research object,focusing on the dynamic response of free vibration and forced vibration,the optimization of the chopper parameters of the control system,and the simulated running state of the train.The specific research content is as follows:Through the dynamic model of single electromagnet levitation(single iron levitation),the levitation control principle is analyzed;the free vibration of the single iron levitation model under the nonlinear control law is approximated and deduced by the multi-scale method,and verified by numerical simulation.The correctness of the approximate solution.Evaluate the performance of the maglev train under the nonlinear control law by using the limited conditions and the approximate solution expressions of the levitation gap displacement,velocity,acceleration,current and levitation force of the single-iron levitation model;based on the analysis of the free vibration characteristics.Derive the approximate solution form of the suspension gap under forced vibration under the nonlinear control law of the single-iron levitation model,and then obtain the relationship between the constant amplitude solution of the suspension gap and the external excitation parameters,which can provide guidance for the design of the maglev train.By using the Simulink toolbox,a chopper circuit model of a single-iron levitation control system is built,and the impact of the key control parameters of the chopper on the output current is studied.Based on the Simulink toolbox,the dynamic model of the single-iron suspension system can be established,which can realize the direct joint coupling analysis of the circuit model and the dynamic model.Based on the chopper circuit model of the single-iron suspension system and the overall system simulation model of the dynamic model,the influence of the key control parameters of the chopper on the dynamic response of the suspension is studied.In order to quantitatively study the influence of factors on the single-iron suspension model,Taguchi method is used to analyze the influence degree of suspension response and load capacity.Finally,based on the UM software,a digital prototype of the maglev train is established,and the operation of the maglev train under different working conditions is analyzed.