Dynamic Behaviors Study Of High-Speed Train Model With Flexible Bogie Frame Under Operational Environment

In this thesis,finite element method and floating frame of reference method are used to simulate of rigid-flexible coupling model of high-speed train,which considers the flexible bogie frame,and car body,motor,gearbox and wheelset as rigid body.By virtue of virtual power principle and D ’Alembert principle,the motion’s equations of rigid-flexible coupling model of high-speed train are obtained.The degrees of freedom of bogie frame’s finite element model are condensed by substructure technique and sparse patterns approximate inverses technique method(SPAI).By using generalized-α method and JFNK(Jacobian-free Newton-Krylov)method,the motion’s equations of rigid-flexible coupling model of high-speed train can be solved.The present model is degenerated into the rigid model,and the same model is established in SIMPACK,and the correctness of the present method is verified by comparing the results.Then,the finite element method and modal approach are respectively used to calculate the same model with floating frame of reference method respectively,which the correctness of present model is verified again,and the flexibility and efficiency of present method is demonstrated as well.This thesis discusses the effects of two common service environments,namely,the irregularity of track and wheel polygonization,on the acceleration of the center of mass of the main components of a train and the stress on key points in the bogie frame.Specifically,the wheel-rail forces of vehicle model are emphasized under the wheel polygonization.The results indicate that the influence of the irregularity of track on the vehicle system cannot be ignored.The maximum vertical acceleration of the internal parts of the vehicle system,the stress value of the key points of the bogie frame and the maximum value of vertical force between the wheelset and rail increases with the increase of the order of the wheel polygon and the depth of wheel wear,while the minimum value of the vertical force between the wheelset and rail decreases with the increase of the order of the wheel polygon and the depth of wheel wear.In service,the wheel polygon phenomenon should be focused on.