| The unique self-stable levitation characteristics of high-temperature superconductors make the high temperature maglev train have the potential to become a vehicle for the future.For a high-speed vehicle ready to be put into operation,safe and stable operation is the basic condition for application.In 2000,Southwest Jiaotong University developed the world's first manned high-temperature Maglev test vehicle,which represents that the high temperature superconducting magnetic levitation vehicle system can run smoothly under laboratory conditions,but it needs to be further studied to put into engineering use.The operation condition of the train is very complicated,When the complex operation conditions cause the vibration of train body,the external magnetic field acting on the high-temperature superconductor bulks at the bottom of the vehicle body will also change,whith will aggravate the flux movement inside the high-temperature superconductor bulks.These changs then affect the running state and performance of the train,which will endanger the driving safety.Therefore,it is very important to study the dynamic levitation characteristics of a maglev vehicle system under the working condition.The main work of this paper is as follows:(1)A high-temperature superconducting levitation test platform was built to test the levitation characteristics of high-temperature superconductor bulks.The levitation force and force relaxation of a high-temperature superconductor bulk were measured under zero field cooling and field cooling mode.(2)The equivalent current method and COMSOL finite element software are used to calculate and analyze the magnetic field above the polar and Halbach orbits,and the correctness of the analytical method is verified.The influence of the gap between the yoke and the permanent magnet block on the magnetic field is analyzed.(3)Based on the H-method,a two-dimensional finite element model of Maglev system is established,and the influence of initial height and working height of a hightemperature superconductor bulk on the levitation force of the high-temperature bulk under zero field cooling and field cooling mode is analyzed.(4)The magnetic levitation performance of a high-temperature superconductor bulk under vibration condition was studied,and the change trend of the levitation force of a high-temperature superconductor bulk under axial vibration condition was investigated by simulation.(5)Based on the two-dimensional numerical model,the levitation characteristics of the high-temperature superconductor bulk above the antipolar permanent magnet orbit are analyzed.The influence of orbit size on the levitation force of high-temperature superconductor bulk was researched. |
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