Wheel/rail dynamic interactions of heavy-haul locomotives are highly nonlinear and complicated due to large traction/braking loads, frequent anti-slip control and complex wheel/rail interface environment. The wheel/rail dynamic interactions, as well as the interface wear, have been broadly studied by means of Hertzian contact analysis, but the wheel/rail contact is essentially a non-Hertzian contact matter. This paper presents an investigation of wheel/rail dynamic interaction characteristics of a heavy-haul locomotive subjected to traction loads and dry/wet/greasy contact conditions by using a non-Hertzian contact method. For this purpose, a comprehensive dynamics model for heavy-haul train-track coupled system is established. A non-Hertzian normal contact algorithm and the corresponding creep algorithm are employed to solve wheel/rail normal and tangential contact forces, respectively. The locomotive wheel/rail dynamic interactions under different contact conditions and traction efforts are discussed. The simulation results indicate that traction effort and friction conditions have a significant influence on the contact forces, distributions of contact stress, and adhesion-slip region in the wheel/rail contact patch. The adhesion-slip distributions were found to reach full-slip under the lowest-adhesion conditions, and the wear index was found to be much greater than that under dry condition.


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    Title :

    Non-Hertzian contact analysis of heavy-haul locomotive wheel/rail dynamic interactions under changeable friction conditions


    Contributors:
    Yang, Yunfan (author) / Guo, Xinru (author) / Sun, Yu (author) / Ling, Liang (author) / Zhang, Tao (author) / Wang, Kaiyun (author) / Zhai, Wanming (author)

    Published in:

    Vehicle System Dynamics ; 60 , 6 ; 2167-2189


    Publication date :

    2022-06-03


    Size :

    23 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown




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