Running safety of a railway vehicle in the presence
of random track irregularities
1
Politechnika Warszawska
Publication date: 2012-11-02
Rail Vehicles/Pojazdy Szynowe 2012,4,1-10
ABSTRACT
The paper presents the authors investigations on dynamics of a railway
vehicle, especially the effect of various factors on the running safety. The
applied simulation methods used for analysis of running safety are in
agreement the technical standards UIC 518 and EN 14363. The numerical
simulations are performed for non-linear model of railway vehicle (a
passenger car) moving along a tangent track with lateral and vertical
geometrical irregularities of random character. The obtained results are used
to study how the derailment coefficient is affected by the ride velocity, the
parameters of the primary and secondary vehicle suspension, the wear of
wheel and rail profiles as well as the track condition. The investigation of
running safety is further enhanced by performing the spectral analysis of the
dynamical responses of the railway vehicle-track system. It is found that there
is a direct relation between the obtained power spectral density (PSD) of the
derailment coefficient and the PSD of the lateral and angular wheelset
displacements showing the characteristic oscillations due to the wheelset
hunting. Finally, the paper presents the results of the statistical analysis of
local track geometrical irregularities occurring in the vicinity of the track
points where the derailment coefficient attains large values.
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| eISSN: | 2719-9630 |
| ISSN: | 0138-0370 |
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