This study investigates the influence on the wheel-rail contact forces of the running speed and the shape and position of weld defects along the track. For this purpose, a vertical dynamic model in the space domain is used. The model is obtained from the transformation between the domains of frequency and space using a Rational Fraction Polynomials (RFP) method, which is modified with multiobjective genetic algorithms in order to improve the fitting of track receptance and to assist integration during simulations. This produces a precise model with short calculation times, which is essential to this study. The wheel-rail contact is modelled using a non-linear Hertz spring. The contact forces are studied for several types of characteristic welds. The way in which forces vary as a function of weld position and running speed is studied for each type of weld. This paper studies some of the factors that affect the maximum forces when the vehicle moves over a rail weld, such as weld geometry, parametric excitation and contact stiffness. It is found that the maximum force in the wheel-rail contact when the vehicle moves over a weld is not always proportional to the running speed. The paper explains why it is not proportional in specific welds. ; This work was partly financed by the European Horizon 2020 Joint Technology Initiative Shift2Rail through contract No 730841. The authors also wish to thank the Spanish Research Ministry MICINN/Economy and Competitiveness Ministry MINECO for their funding through contract TRA2014-59599-R, including funding by the FEDER-ERDF European Regional Development Fund, and also the Basque Government for financial assistance through IT919-16. The financial assistance received from UPV/EHU through the training and research unit UFI11/29 is likewise gratefully acknowledged.


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    Titel :

    On the non-proportionality between wheel/rail contact forces and speed during wheelset passage over specific welds



    Erscheinungsdatum :

    01.01.2018



    Medientyp :

    Sonstige


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :

    DDC:    621




    On the non-proportionality between wheel/rail contact forces and speed during wheelset passage over specific welds

    Correa García, Nekane / García Vadillo, Ernesto / Santamaría Manrique, Javier et al. | BASE | 2018

    Freier Zugriff

    Wheel-Rail Contact Forces in a Wheelset Dynamics Modelling

    Sadowski, R. / Chudzikiewicz, A. | British Library Conference Proceedings | 1994