Research On The Coupling Self-excited Vibration Of The Mechanical Braking Of The EMS Maglev Train

The vibration of the coupling of the train-track had always been a problem for the EMS maglev train that has not yet been completely solved.The vibration of the coupling of the train-track can make the system instable,reduce the passenger’s comfort,and even cause the safety accident.Therefore,solving the problem of track resonance is of great significance to practical engineering.Triggering track resonance’s situation is complicated,the reasons for the generation of car resonance is also more diverse.This paper mainly studies the problem of track resonance that occurs under mechanical braking.(1)First,the theoretical model of the electromagnet was established,including the Euler-Bernoulli model,Timoshenko model and two simplified models based on Timoshenko beam model and take into account the actual parameters,calculate the natural frequency of the electromagnet and analyze the shape function.Finally,the electromagnet is a beam structure with simply supported ends.The above four models are calcualted according to the required precision and the appropriate complexity of the formulation.This is equivalent to modeling the controlled object of the rail coupling system.The work of the electromagnet analysis laid a good foundation.(2)Through ANSYS finite element simulation and the tapping test method to verify the theoretical model established in the previous chapter,the experimental modal shape of the electromagnet and the natural frequency of the electromagnet are obtained.The simulation results and experimental results show that the theoretical model established in the previous chapter is of practical value.And the results of simulation and experiment are compared with the results of theoretical calculation to explore the accuracy of theoretical modeling.(3)Analyze the brake and model the brake,the suspension module is modeled dynamically,analysis the stability of the system,the brake model is then added to the kinetic equations of the suspension module model.And then explore the stability of the suspension module system,to determine whether the brake is the cause of the coupling of the track coupling.The main work of this paper is about the accused object: including the constuction of the electromagnets and brakes,this paves the way for the subsequent establishment of a complete dynamic model for the analysis of the track resonance problem.