Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits
During the past years, several tools have been developed to try predicting wheel and rail
wear of railway vehicles in an e-cient way. In this MSc thesis a new wear prediction
tool developed by I.Persson is studied and compared with another wear prediction tool,
developed by T.Jendel, which has been already validated and is in use since several years
ago. The advantages that the new model gives are simpler structure, the consideration of
wear as a continuous variable and that all the code is integrated in the same software.
The two models have the same methodology until the part of the wear calculations
and the post-processing. Wheel-rail geometry functions and time domain simulations are
performed with the software GENSYS.
In the simulation model the track and the vehicle are dened as well as other important
properties such as vehicle speed and coe-cient of friction. Three simple tracks are used:
tangent track, R=500 m curve with a cant of ht=0.15 m on the outer rail and R=1000 m
curve with a cant of ht=0.1 m on the outer rail. The model is assumed to be symmetric so
just outer (first and fourth axle) and inner (second and third axles) wheels are considered.
During the vehicle-track interaction, the normal and tangential problems are solved.
The wheel-rail contact is modelled according to Hertz's theory and Kalker's simplied
theory with the help of the algorithm FASTSIM. Then wear calculations are performed
according to Archard's wear law. It is applied in dierent ways, obtaining wear depth
directly in Jendel's and wear volume rate in Persson's model.
Jendel's model is rstly analyzed. Its specifc methodology is briefly explained and
modications are performed on the code to make it work as similar as possible to Persson's
model. Also parameters regarding the distance in which wear calculations are taken, the
discretization of the width of the wheel and the discretization of the contact patch are
The methodology of Persson's model is also studied, most of all the performance of the
post-processing which is one of the keys to the code. The parameters analyzed in this code
are the ones regarding a statistical analysis performed during the post-processing and the
discretization of the contact patch.
Finally the comparisons between the wear depth obtained for both models are carried
out. The discrepancies between the models are explained with the parameters analyzed
and the dynamic behaviour of both models. Also a theoretical case is used as reference for
2013. , 91 p.
2013-05-28, Vehicle Engineering Laboratory (VEL), Teknikringen 8, ground floor, Stockholm, 10:00 (English)