This paper has dealt with the vehicle/track interaction by taking into account the complex coupling between the rail and the rail pad. For this purpose, the rail has been modelled as an infinite Timoshenko beam resting on semi-sleepers via three-directional rail pads, and the vehicle considered as a two-mass oscillator. The time-domain analysis has been performed by developing Green's matrix of the track method. Green's matrix of the track has been calculated based on the properties of the track, which is a damped periodic structure. This matrix represents the rail response, in the time domain along a sleeper bay, to a unit moving impulse force. Performing the Fourier transform, one can obtain the rail receptance along a sleeper bay, due to a moving unit harmonic force. For frequencies within the pinned-pinned range, the receptance of the rail has two peaks instead of one and the asymmetric shape between sleepers, owing to the Doppler effect; hence, these features may influence the wheel/rail interaction and the short-pitch corrugation growth. In order to solve the equations of motion which describe the vehicle/track interaction, the time-domain Green's functions of the two-mass oscillator and Green's matrix of the track are used to obtain the following: the former, the contact force from the equation of the wheel/rail contact, and latter, the rail displacement at the loading point and the displacements of the vehicle bodies. This approach may be generalised for the case of the multiple degree-offreedom vehicle model having a single wheel/rail contact point. The vehicle/track steady-state interaction exhibits the parametric resonance when the frequency of the parametric excitation due to sleepers equals the natural frequency of the vehicle/track system. Also, the 1/2 sub-harmonic parametric resonance may be recorded if the vehicle velocity equals half of the value corresponding to the parametric resonance velocity. The spectrum of the wheel/rail contact force is influenced by velocity, by pushing the powerful components at a high frequency as the velocity increases. As a consequence, the vibration level increases and, consequently, encourages the development of corrugation. The numerical simulation has shown that the contact force is significantly overestimated at the speed of the parametric resonance, especially if the wheel model is used instead of the vehicle model.


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    Titel :

    Prediction of the interaction between a simple moving vehicle and an infinite periodically supported rail - Green's functions approach


    Beteiligte:
    Mazilu, Traian (Autor:in)

    Erschienen in:

    Vehicle System Dynamics ; 48 , 9 ; 1021-1042


    Erscheinungsdatum :

    2010


    Format / Umfang :

    22 Seiten, 14 Bilder, 2 Tabellen, 30 Quellen




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch