Analysis And Optimization Design Of Hybrid Magnetic Suspension Supporting Structure Of EDS And EMS

The growing social economy and people’s livelihood demand has spurred the train to speed up and put forward higher requirements for vibration,noise and energy consumption.The maglev train uses electromagnetic force to overcome gravity and eliminate mechanical friction.It has the advantages of high speed and low noise,and is one of the development directions of the future transportation system.The hybrid support structure of permanent magnet electrodynamic suspension and electromagnetic suspension can ensure good suspension performance while reducing construction and operation costs.Based on the mathematical model of hybrid support structure,the supporting characteristics were analyzed.The multi-objective optimization of the support structure was carried out by using genetic algorithm and finite element software.The correctness of the analysis was verified by experiments,which provides a certain foundation for the research of high-speed maglev trains.The main research contents are as follows:The characteristics and current status of the maglev train support structure were summarized in a large number of literatures,and the advantages of the hybrid magnetic suspension support structure are proposed.The mathematical model of the hybrid support structure was established.The relationship between electromagnetic force and speed of permanent magnet electrodynamic suspension and the relationship between electromagnetic force and air gap of electromagnetic suspension were discussed,which provides theoretical basis for multi-objective optimization and finite element simulation.Under the premise of meeting the design requirements,the multi-objective optimization design of the support structure was carried out by genetic algorithm.The floating resistance ratio of permanent magnet electrodynamic suspension and the traction force of electromagnetic suspension were optimized.The electromagnetic force and resistances were the constraints.Considering the air resistance and the centrifugal force during cornering,the fitness function was established.The calculation was programmed in MATLAB,and the constraints were adjusted according to the results to obtain the optimal support structure parameters.In the ANSYS Maxwell software,the support structure was parametrically simulated,and the magnetic field distribution and electromagnetic force characteristics were obtained to verify the correctness of theoretical analysis and model simplification.The influence of speed on permanent magnet electrodynamic suspension and the influence of current on electromagnetic suspension were analyzed.The parameterdriven simulation was used to improve calculation accuracy and efficiency.The fitting curve of simulation results is consistent with theoretical analysis.The permanent magnet electrodynamic suspension was verified by a simplified experimental device.Using the rotating disc track to achieve high-speed relative motion with the permanent magnet Halbach array,the experimental results have the same trend as the simulation but the numerical error is large.The causes of the error were analyzed.The simulation and experimental errors were reduced to 15% by modifying the air gap and the simulation model.