Vibration Research And Dynamics Optimization Of Bogie Of Medium-speed Maglev Trains With Mid-mounted Linear Motor

The maglev train is a new type of transportation,which does not rely on wheels and has bare direct friction with trail.It provides more possibilities for human beings to pursue higher speed.According to the characteristics of low-speed maglev and high-speed maglev,the National University of Defense Technology developed an engineering prototype of medium speed maglev train,which the speed is designed for160 km / h and successfully operated on the 204 test line of NUDT.This paper is based on the problems which are found in the test of the maglev train.The main contents are as follows:1.Firstly,the theoretical model involving the flexibility of guideway of the medium speed maglev train is carried out.The Newton-Euler method is used to establish the multi-rigid dynamic model of the whole vehicle.The mathematical model of the Euler beam is established.So that the vibration differential equation of vehicle-guideway coupled is gotten.2.the vibration test and analysis are carried out about the whole vehicle,and the excitation sourced is found.Firstly,comparing the amplitude of the vibration,when the vehicle passes through the whole line,then the tests are aim at the track section with strong vibration.The test of sliding which means the vehicle is towed to a specific position on the vertical curve,then cutting off the current of the ground long stator,and makes the sliding train accelerate during the vertical curve.At last the vibration source is recognized as the normal force between the motor and the sleepers.3.Based on the simulation of commercial software,it shown that the difference of normal force is the main reason of the abnormal vibration.The ANSYS is used to obtain the stiffness and mode of the wide and narrow sleeper.There is barely diference in stiffness and mode.The normal force between them and the motor are different by simulation.The bogie model is established based on the LMS virtual.Lab motion multi-body dynamics software.The vibration response with different sleepers is simulated.It is shown that strong vibration is caused by the large amplitude fluctuation of the normal force.4.From the aspect of reducing the vibration of bogie,the dynamic parameters are optimized.By adjusting the stiffness and damping involving suspension and anti-rolling and other parameters of bogie,the influence of these parameters is analyized by simulation.Basing on the regularity,it is found that there is a group of appropriate parameters which keep the vibration down obviously.5.The vibration reponse of the medium-speed maglev train is simulated when considering the trail irregularity during high speed.Combined with the irregularity of the rail line,the optimized parameters are used to simulate the whole vehicle model running at higher speed.In this project,the vibration problem of the bogie of the Medium-speed Maglev Trains with Mid-mounted linear motor is studied systematically.Combining the test and simulation analysis,the reason of the abnormal vibration of the bogie in specific location and speed is revealed.In this paper,the method which keeps the vibration down is optimized parameters of the bogie.And the method is verified by simulation.The research of this paper is significant and valuable in promoting the engineering application of the medium-speed maglev train.