Simulation Analysis Of High-speed Maglev Train-bridge Coupling Vibration

As a new traffic system,maglev has many advantages.China has been tracking the development of maglev transportation technology for a long time and has a certain research basis.With the successful opening of maglev line and the construction of high-speed maglev test line,it is urgent to study the problems in engineering application.The running speed of international commercial maglev train is no more than 300km/h.The research on commercial maglev train: the mechanism and characteristics of vehicle-bridge coupling vibration have been gradually mastered.However,the mechanism and characteristics of600km/h maglev train-bridge coupling vibration are not well understood.In order to provide theoretical support for the subsequent 600km/h high-speed maglev train test,a 600km/h high-speed maglev train-bridge coupling model was established in this paper to analyze the600km/h high-speed maglev train-bridge coupling vibration mechanism and characteristics.Firstly,the maglev train-bridge coupling system is established by using APDL in ANSYS,and the PD suspension control model based on state observer is adopted in the control system.On this basis,the influence of track beam and maglev train operation on the natural vibration characteristics of bridge structure is analyzed.The MATLAB program was used to convert the German low interference power spectrum into the track height and height irregularity space sample.Finally,the track height and height irregularity space sample was adjusted according to the actual requirements of the project.Secondly,the maglev system-bridge coupling dynamic responses under single suspension frame,single carriage,two carriages and three carriages were calculated when the vehicle speed was 600km/h,and the simulation results of maglev system-bridge coupling dynamic responses under single suspension frame were compared with the actual test results.The results show that the simulated value is in good agreement with the measured value,and the model is reliable.Finally,based on the maglev train-bridge coupling model under a single car,the influences of driving speed,bridge structure Rayleigh damping,train weight,track irregularity,suspension stiffness of primary system and suspension stiffness of secondary system on the maglev train-bridge coupling system vibration are analyzed.