Study On Quasi-static And Dynamic Mechanical Characteristics Of High Temperature Superconducting Maglev Train

Magnetic levitation trains overcome the frictional constraints of traditional wheelrail trains to achieve higher speeds and become a new hot spot in the development of rail transit in the future.High-temperature superconducting magnetic levitation trains based on magnetic flux pinning characteristics.Among various types of magnetic levitation trains,their working principles have attracted the attention of many scholars at home and abroad due to their characteristics of passive stability(stable suspension without active control).As the magnetic source of high temperature superconducting maglev train,the size and distribution of the magnetic field directly determine the selfsuspension and self-steering ability of the maglev system,and the magnitude of its levitation force directly determines the capacity of the train.In recent years,the specific quantitative comparison indexes of permanent magnet orbits are still not clear enough.FEM software simulation involves less research on field cold suspension characteristics using three-dimensional models.Therefore,this paper conducts analysis and parameter optimization of three-dimensional unimodal permanent magnet orbit magnetic fields.Quasi-static and dynamic mechanical analysis of High Temperature Superconducting Maglev Train.The specific research content was as follows:Based on the finite element software Ansoft Maxwell,the influence of the size and configuration of the permanent magnet on the magnetic field of the single-peak permanent magnet orbit was studied.The magnetic field performance on the upper surface of the permanent magnet track was analyzed,and the influence of the laying gap,pure iron thickness and permanent magnet cross section on the magnetic induction strength in the permanent magnet track was studied,and the cross-sectional size of the permanent magnet track was optimized.It provided a basis for the design of permanent magnetic tracks for high-temperature superconducting maglev trains.The finite element method was used to establish a quantitative analysis method for the field-cooled high-temperature superconducting suspension characteristics.The high-temperature superconductor at the field cold height could be regarded as a low-permeability permanent magnet,and the trapped magnetic field of the high-temperature superconductor was obtained by trial and error.The method of this paper could study the suspension characteristics of high temperature superconductors and permanent magnets at different field cold heights,and it was found that it was in good agreement with the experimental data.According to the similarity of magnetic field and magnetic force,this paper focused on using this method to study the levitation characteristics of high temperature superconducting maglev train and permanent magnet track.In order to increase the levitation force of the high-temperature superconducting maglev train,a sandwich structure with a double-layered permanent magnet track and a hightemperature superconductor was designed,and the expressions of the levitation force and the working height were obtained,and it was abstracted as a levitation force element,which was convenient and dynamic software.The combination provided a basis for subsequent simulation analysis of dynamic characteristics.The UM software was used to establish a high-temperature superconducting maglev train model,perform straight-line performance analysis,evaluate the comfort of the train,and provided basis for the design of the high-temperature superconducting maglev train.After analyzing and optimizing the magnetic field of single-peak permanent magnet track for high-temperature superconducting maglev train,the following conclusions were drawn.The thickness of three pieces of pure iron was recommended to be set to 10 mm,and the cross-section of two pieces of permanent magnet was recommended to be set to a square with a length of 80 mm.After analyzing the quasistatic mechanical characteristics between the high-temperature superconducting magnetic levitation train and the permanent magnet track,it was concluded that the working height and the levitation force have a linear relationship after the stable suspension of the train.After the dynamic modeling simulation analysis of the hightemperature superconducting maglev train,the following conclusions were drawn,and the recommended linear running speed of the train was less than 500 km / h.