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Conference papers

Influence of the track irregularities on the rail fatigue

Abstract : The dynamical response of a train rolling on a real track depends on several parameters. Most of them cannot be accurately identified and have to be considered as uncertain. The aim of this thesis is the construction of a probabilistic model of the rail fatigue life considering the track geometry and the rail wear as random fields modelled with the Karhunen-Loève expansion. The multivariate distributions of the random projection coefficients are characterized using a Polynomial Chaos Expansion (PCE) calibrated on measurements data of the track irregularities. The curve radius, the rail age and the train operational velocity introduce non-stationary effects that have to be taken into account to model the track. A validation of the random models is therefore performed using a set of measurements of the wheel-rail contact forces. A global sensitivity analysis is performed on some dynami-cal quantities of interest in order to quantify the impact of the random fields on the vehicle dynamics and the rail fatigue initiation. Since this step is computationally expensive, a PCE-based meta-modelling technique is employed to estimate the fatigue index.
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https://hal-centralesupelec.archives-ouvertes.fr/hal-02458618
Contributor : Kamilia Abdani <>
Submitted on : Tuesday, January 28, 2020 - 6:45:42 PM
Last modification on : Wednesday, July 8, 2020 - 11:10:22 AM

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  • HAL Id : hal-02458618, version 1

Citation

Alfonso M. Panunzio, Régis Cottereau, Guillaume Puel, Samuel Simon, Xavier Quost. Influence of the track irregularities on the rail fatigue. 11th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems, CM 2018, Sep 2018, Delft, Netherlands. pp.767-774. ⟨hal-02458618⟩

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