We study the rolling motion of a railway wheel on corrugated track. For uniform guiding motion, the trajectory of the contact point, vertical accelerations are evaluated first in the rigid case, then in the case of elastic and visco-elastic contact. Resulting energy dissipation due to friction and percussive effects are calculated and resulting progress of pattern formation is simulated.
DYNAMIC EFFECTS CAUSED BY CORRUGATIONS
Dynamic phenomena caused by the rolling motion of a railway wheel on a corrugated track are studied. For uniform guiding motion of the axle, the trajectory of the geometric contact point and vertical accelerations are determined, first for the rigid body case, then taking into account visco-elastic rolling contact. Energy dissipation caused by friction and impact effects are calculated in order to simulate the further process of corrugation formation.
1. INTRODUCTION
Railway wheels should be round and the surface of rails even – without any pattern other than the desired profile. In normal operation, these ideal assumptions are often not fulfilled, small deviations of the nominal shape occur. If such small deviations tend to amplify themselves, or to copy themselves first to the contact partner and propagate in the effect along the track or damage other wheels, considerable damage and inconvenience may arise. Passenger comfort will be reduced and noise radiation increased, more frequent grinding will be necessary [1-3].
Despite intensive studies of longterm effects in rail-wheel contact, the mechanisms of polygonalization and corrugation are still not fully understood [5].
In this article, we give a review of some recent approaches to modeling the essential quantities involved, and we present results of simulations. (…)
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