With the development of high-speed trains it is necessary to take into account the wave processes in the railroad track and the supporting soil due to the train. Important for practice are so-called critical regimes of the train motion when the amplitude of the track vibrations increases significantly. If the vibrations of the train wheels are negligible, the critical regime is determined by the velocities ot the train near the Rayleigh wave velocity in the subsoil. The critical (resonance) velocities of a harmonically varying point load moving uniformly along an elastic layer are determined as a function of the load frequency. It is shown that resonance occurs when the velocity of the load is equal to the group velocity of the waves generated by the load. The critical depths of the layer are determined as function of the load velocity in the case the load frequency is proportional to the load velocity. This is of importance for high-speed trains where the loading frequency of the train wheel excitations is mainly determined by the ratio between the train velocity and the distance between the sleepers (ties). It is shown that the critical depths are decreasing with increasing train velocity. It is concluded that the higher the train velocity, the more important are the properties of the ballast and the border between the ballast and the substrate.


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    Titel :

    Critical velocities of a harmonic load moving uniformly along an elastic layer


    Beteiligte:
    Dieterman, H.A. (Autor:in) / Metrikine, A. (Autor:in)


    Erscheinungsdatum :

    1997


    Format / Umfang :

    5 Seiten, 4 Bilder, 15 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch