Study On Dynamic Characteristics Of Test Track Structure For Long Stator Low Speed Maglev Train

Maglev train is a new transport mean with good prospects for the development. According to Chinese situation and the existing maglev technology research experience, Southwest Jiao Tong University developed a low speed maglev train in the library with long stator for improvements of carrying capacity, speed stability, turning radius and climbing capacity, which combined suspension, guidance and driving in one and is more suitable for city track traffic. In actual engineering application of magnetic levitation track structure, there are still many dynamic problems in study. Based on the track structure for the test of low speed maglev train with long stator developed by Southwest Jiaotong University, the research on system dynamic modeling and simulation of the track structure is conducted.This thesis carries in-depth research on the maglev test track structure from the perspective static and dynamics. According to the maglev standard, referring to the research production of designed maglev test track. The research method, design parameters, influences factors of vibration and rigid-flexible coupling dynamics of the maglev track are studied.Main contents of the paper are as follows:(1) Combined with the3D model of the maglev test track structure in the long stator low speed library and finite element analysis software ANSYS Workbench, nonlinear contact of statics and stiffness, strength check for the maglev test track structure is done. Analyzed and compared to the response results for the maglev test track structure under different support form. At the same time, researched the impact that structure parameters of elastic pressure unit between sleeper and sleeper bearing of the maglev test track structure on the structure strength and stiffness, and put forward the reasonable selection range of the size of the elastic bearing unit structure.(2) Researched on the characteristic parameters of inherent frequency and vibration for the maglev test track structure, and doing dynamic simulation analysis of the maglev test track structure. Focus on the maglev test track structure parameters on the effect of vibration characteristics, and frequency range that the maglev test track structure is sensitive to vibration. On this basis, optimization design for main parameters of the test track structure of magnetic levitation.(3) Established a mathematical model and equation of rigid-flexible coupling dynamic analysis for the test track structure of magnetic suspension by Bernoulli-Euler method, and programed the dynamic simulation by Newmark display integration method, and doing system simulation analysis for the rigid-flexible coupling vibration under the dynamics model of maglev test track structure through the MATLAB simulation software. Mainly analyzed of maglev test track structure dynamic response under different conditions, and researched on the application of equivalent spring in Maglev Test Track Structure of rigid-flexible coupling vibration. The response characteristics of the maglev test track structure parameters are compared and analyzed, and got the reasonable range of the unit structure parameters of elastic maglev test track structure bearing.In conclusion, this paper research the nonlinear contact static strength,stiffness analysis, track structure dynamic output response analysis and track system rigid-flexible coupling dynamic simulation on long stator low-speed maglev test track structure, and optimization design of track structure, get the reasonable range of elastic bearing unit, provide the theoretical basis for the engineering application of the low-speed maglev train track structure.