Simulation Of Railway Track Deterioration
Influenced By Ballast Stiffness And Dry Friction
Author(s)
J. Droździel & B. Sowiński
Abstract
It is known, that track deterioration (loss of its geometry) strongly depends on
track support conditions, particularly on the ballast. In this paper a novel
approach is presented to predict the evolution of track vertical irregularities due
to vehicle-track dynamic interaction taking into account ballast stiffness with dry
friction. An applied vehicle-track model is composed of a railway car and a
track. The track is assumed to be a discrete system having a series of inertial
elements, which are elastically coupled. The vertical ballast stiffness may
fluctuate along the track and its damping is described by dry friction with the
friction force depending on wheelset loading. In the track model, initial
irregularities may be introduced to initiate the process of track deterioration and
vertical track irregularities expansion. Simulation results are evaluated for a
series of rail car passing and referred to other results.
Keywords: track, vehicle, dynamics, simulation, deterioration.
1 Introduction
Modern railway track is an important factor in providing a good transportation
system. Large sums of money are dedicated to the railway track maintenance and
renewal. Formerly, most attention has been given to the track superstructure (the
rails, the fasteners and the sleepers), and less attention has been given to the
substructure (the ballast, the subballast and the subgrade). Although these
substructure components have a major influence on the track quality, less
attention has been given to them because the properties of the substructure are
more sophisticated then the properties of the superstructure.
This paper shall be restricted to examining the influence of the elastic and
damping properties of the ballast on the track settlement and deterioration of its
Keywords
track, vehicle, dynamics, simulation, deterioration.
Related Book
Other papers in this volume
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