Study On Electromagnetic Force Characteristics Of Superconducting Electrodynamic Suspension And Design Of Its Test Bench

The null-flux superconducting electrodynamic suspension(EDS)is a self-stable maglev method based on Lenz’s law.It has outstanding advantages such as large air gap,fast running speed,large load capacity and no need for active control,and has broad application prospects.At present,Japan has built two test lines,the Miyazaki test line and the Yamanashi test line,and has accumulated numerous research results.In 2015,the L0 Series superconducting EDS train set the highest speed record of 603 km/h for man-loading railway vehicles,which fully proves the potential and advantages of EDS technology in the high-speed field.At present,most of the research about this technology in China is still in the theoretical research stage,and it is necessary to deepen the experimental research.Building a test bench is a common experimental method for the study of railway vehicles,but there is currently a lack of an equivalent test method to simulate the actual operation of the null-flux EDS system.Therefore,the main work of this thesis is to use the finite element simulation model to study the electromagnetic force characteristics of the superconducting electrodynamic system,and to research and design the equivalent simulation method and vibration test bench suitable for the superconducting EDS system.The specific research is as follows:1.The principle and characteristics of the superconducting EDS vehicle are studied,and a three-dimensional transient finite element electromagnetic simulation model of the superconducting EDS based on the COMSOL Multiphysics software is established.The test data of the Yamanashi test line is used as a reference to verify the accuracy of the simulation model.2.The electromagnetic force characteristics of the superconducting EDS vehicle are analyzed by using the finite element simulation model,mainly the influence of speed,vertical displacement and lateral displacement on levitation force,guiding force,drag force and the fluctuation amplitude of levitation force,and how these factors affect the electromagnetic force characteristics of EDS vehicles is also analyzed.In addition,the effect of the length of the superconducting magnet on the levitation force and its fluctuation is also studied,and a superconducting coil length that can minimize the fluctuation of the levitation force is found.3.A vibration test bench for superconducting EDS is designed,and based on the existing research results,the experimental principle and method for simulating the actual operation of superconducting EDS vehicles are proposed,which provides a theoretical reference for building a superconducting EDS test system.In conclusion,to design the superconducting EDS vibration test bench,this thesis establishes the finite element analysis model of the superconducting EDS and analyzes the electromagnetic force characteristics of the superconducting EDS vehicle.According to the electromagnetic force characteristics of superconducting EDS,the experimental principle and method of equivalently simulating the operation of superconducting electric suspension system are proposed.The relevant research results will provide theoretical basis and reference for the construction of superconducting EDS vibration test bench.