Growth of railhead roughness (irregularities, waviness) is predicted through numerical simulation of dynamic train-track interaction on tangent track. The hypothesis is that wear is caused by longitudinal slip due to driven wheelsets, and that wear is proportional to the longitudinal frictional power in the contact patch. Emanating from an initial roughness spectrum corresponding to a new or a recent ground rail, an initial roughness profile is determined. Wheel-rail contact forces, creepages and wear for one wheelset passage are calculated in relation to location along a discretely supported track model. The calculated wear is scaled by a chosen number of wheelset passages, and is then added to the initial roughness profile. Field observations of rail corrugation on a Dutch track are used to validate the simulation model. Results from the simulations predict a large roughness growth rate for wavelengths around 30-40 mm. The large growth in this wavelength interval is explained by a low track receptance near the skepers around the pinnedpinned resonance frequency, in combination with a large number of driven passenger wheelset passages at uniform speed. The agreement between simulations and field measurements is good with respect to dominating roughness wavelength and annual wear rate. Remedies for reducing roughness growth are discussed.


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    Title :

    Numerical prediction of rail roughness growth on tangent railway tracks


    Additional title:

    Numerische Vorhersage des Rauhigkeitswachstums im tangentialen Bereich von Eisenbahnschienen


    Contributors:


    Publication date :

    2003


    Size :

    12 Seiten, 4 Bilder, 1 Tabelle, 13 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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