Design of railway infrastructure is largely done on a basis of trial and error, with limited use of numerical simulation and structural analysis. Costs could be reduced by proper dimensioning and maintenance, along with the creation of a catalogue of degradation processes and failure mechanisms, consolidating and combining existing knowledge and software tools. Vehicle-track interaction is extremely complicated, and a true multi-scale problem. If we change one aspect of the system, such as the coefficient of friction, then as a direct consequence the wheel-rail contact forces will change. This in turn changes the bending and rotation of the rail, particularly at voided sleepers or in the case of weak fastenings. This changes the contact geometry and feeds back into the contact forces again. The same happens in the vehicle, where the contact forces interact with bending and torsion of the axles and the bogies' steering ability. Integrated modelling is particularly relevant for studying track degradation processes. This is because the dynamics of track are governed by frequencies in the range of 50 Hz to 1000 Hz or higher. Current vehicle dynamics models, such as Simpack Rail, typically focus primarily on the low frequency range of 0 Hz to 50 Hz, which is the main concern for passenger comfort and stability. But the resulting forces for the higher frequencies are often ignored, so that no good predictions can be made for the loadings on sleepers, fastenings and other track components. In order to model the higher frequencies correctly, the elasticity of the rails and substructure must be taken into account. In recent years, several researchers have presented modelling activities intended to understand the dynamics of track, suggesting that integrated vehicle-track modelling for the desired frequency range is possible, by combining existing approaches rather than developing new ones. Pushing these boundaries will provide the industry with new tools and improve their predictive capabilities, supplementing 'engineering judgement' and enhancing track design.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Towards a better understanding of track degradation


    Beteiligte:

    Erschienen in:

    Erscheinungsdatum :

    2014


    Format / Umfang :

    3 Seiten, Bilder, 3 Quellen



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Print


    Sprache :

    Englisch




    A better understanding of continuous welded rail track

    British Library Online Contents | 1996




    Towards A Better Understanding of Model Validation Metrics

    Liu, Yu / Chen, Wei / Arendt, Paul et al. | AIAA | 2010


    Towards A Better Understanding of Model Validation Metrics

    Arendt, P. / Chen, W. / Liu, Y. et al. | British Library Conference Proceedings | 2010