The modelling of the vertical dynamics of a track at high frequencies requires rather complex approaches to take into account section deformations. Validation is usually made by comparing computed frequency responses with measured ones. In this study an experimental model of a railway track is proposed based on the analysis of recorded time histories of impact excitations and the corresponding vibrations of the rail with autoregressive (AR) techniques. Measurements are used not only as a convergence parameter that the model must approach, but are also entirely used to describe the dynamic behaviour of the rail in the frequency range 150 divided by 5000 Hz. Frequency response functions are reconstructed with a very high fidelity but the model obtained is not general, as it is applicable only to the measured track section under the hypothesis of linearity. The measurement details, the construction and the validation of the model are shown in this paper.
Time domain model of the vertical dynamics of a railway track up to 5 KHz
Vehicle System Dynamics ; 30 , 1 ; 1-15
1998
15 Seiten, 8 Quellen
Article (Journal)
English
Time Domain Model of the Vertical Dynamics of a Railway Track up to 5 kHz
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