A vertical vehicle–track coupled dynamic model, consisting of a high-speed train on a continuously supported rail, is established in the frequency-domain. The solution is obtained efficiently by use of the Green's function method, which can determine the vibration response over a wide range of frequency without any limitations due to modal truncation. Moreover, real track irregularity spectra can be used conveniently as input. The effect of the flexibility of both track and car body on the entire vehicle–track coupled dynamic response is investigated. A multi-body model of a vehicle with either rigid or flexible car body is defined running on three kinds of track: a rigid rail, a track stiffness model and a Timoshenko beam model. The results show that neglecting the track flexibility leads to an overestimation of both the contact force and the whole vehicle vibration response. The car body flexibility affects the ride quality of the vehicle and the coupling through the track and can be significant in certain frequency ranges. Finally, the effect of railpad and ballast stiffness on the vehicle–track coupled vibration is analysed, indicating that the stiffness of the railpad has an influence on the system in a higher frequency range than the ballast.


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    Title :

    Vertical random vibration analysis of vehicle–track coupled system using Green's function method


    Contributors:
    Sun, Wenjing (author) / Zhou, Jinsong (author) / Thompson, David (author) / Gong, Dao (author)

    Published in:

    Vehicle System Dynamics ; 52 , 3 ; 362-389


    Publication date :

    2014


    Size :

    28 Seiten, 93 Bilder, 7 Tabellen, 29 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English