In the coupling vibration of vehicle-track system, Hertz nonlinear wheel-rail connect model precisely describes the normal wheel-rail forces. Because of the nonlinear wheel-rail relationship, the vehicle-track system can only be solved iteratively with very small time step, which leads to a slow computation process. To simplify the calculation of wheel-rail force, the secant linear model and the tangent linear model are put forward and their vertical wheel-rail stiffness, additional stiffness matrix, and additional force vector of the vehicle-track system by the vertical wheel-rail forces are deduced. To prove the two linear-approximation wheel-rail connect models, the CRTS-II slab ballastless track is taken for example and the vertical wheel-rail forces of the vehicle-track system under the three vertical wheel-rail contact models are compared when an individual vehicle passes the track at a speed of 250 km/h. The results show that the time-variant wheel-rail stiffness of Hertz nonlinear wheel-rail connect model is different from that of secant linear model or tangent linear model. However, the excitation of vehicle-track system is essentially the rail irregularity and the static wheel load. With constant rail irregularity and static wheel load, when the vertical wheel-rail stiffness is different, the vertical wheel-rail relative displacement is changed to meet almost the same of the vertical wheel-rail force.


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    Title :

    Comparison and Verification of Vertical Wheel-Rail Contact Models


    Contributors:
    Yang, Jingjing (author) / Zhang, Nan (author) / Meng, Jiao (author)

    Conference:

    First International Conference on Rail Transportation 2017 ; 2017 ; Chengdu, Sichuan Province, China


    Published in:

    ICRT 2017 ; 339-348


    Publication date :

    2018-03-13




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




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