The work describes a method to predict the evolution of the wheel profile of a railway vehicle, depending on the load history acting on the wheelset. The method is based on the determination of the wear on the contact area, which is divided into finite elements according to the strip theory. For each element, in presence of slip, the amount of material loss is evaluated depending on the local value of tangential force and creepage (the meaning of creepage is assumed as the ratio between the sliding velocity and the tangential rolling velocity). The empirical relation is evaluated according to results of experimental test obtained from literature. The wear is calculated for the entire contact area superimposing the contribution of each element. The motion of the wheelset in lateral direction causes a motion of the contact patch along the profile. Sequentially, the contact area will acquire a different contact shape and stress distribution. The shape of the worn profile depends on both the load condition and the motion of the wheelset with respect to the track. This profile can be obtained from the new one by subtracting at each time step the material removed from the contact area. This procedure is simple, but requires variable profiles for each time step and is not efficient in computational terms. The strategy proposed here by the authors, is to consider finite periods obtained superimposing several revolutions of the wheelset. The worn profile is evaluated in a single step from the cumulative of damage of an entire period The limitation of this method consists in the different behavior of a wheelset with wom profile respect to a wheelset with new ones and therefore produces different wear. It is necessary to determine an optimal value for the period to be used to re-evaluate the profile shape, in order to minimize the difference in the predicted shape itself.
Numerical simulation of wear in railway wheel profiles
Numerische Simulation des Verschleißes im Profil von Schienenfahrzeugrädern
2006
15 Seiten, 29 Bilder, 4 Tabellen, 17 Quellen
Aufsatz (Konferenz)
Englisch
A numerical simulation of wheel/rail wear
British Library Conference Proceedings | 2003
|Wear of Railway Wheel Profiles: A Comparison Between Experimental Results and a Mathematical Model
British Library Conference Proceedings | 2003
|Simulation of the development of a railway wheel profile through wear
Tema Archiv | 1991
|Wear of Railway Wheel Profiles: A Comparison between Experimental Results and a Mathematical Model
Taylor & Francis Verlag | 2002
|