Würzburger Strassenbahn GmbH (WSB) plans to expand
its network. The transition from the existing network
to the planned extension poses a challenge in terms of
track layout due to the existing buildings and the hillside
location. The existing GT-E and GT-N vehicles must be able
to run on the new route, while ensuring derailment safety,
tolerable torsional loads and being free of constraints.
PROSE has been commissioned to investigate these issues
by performing a running dynamics simulation.
Available vehicle data was compiled for the model set-up.
Missing data was supplemented by PROSE using calculated
Torsional stiffness of the running gear and the car bodies
are of particular importance here. These figures were not
known at the beginning of the project and cannot be
adequately estimated. Therefore, distortion measurements
were carried out in advance by PROSE’s accredited testing
Using the two vehicle models, the simulations were
first carried out on a route on the existing network. This
reference route is currently used regularly by both vehicle
types and is presumably the current critical point when it
comes to the torsional loads.
The core work for this project is the simulation of the newly
planned route. Boundary conditions such as loading, winter
stiffening of the rubber springs, etc. can be varied. The
results are evaluated against rules and regulations, as well
as the reference run.
At this point the trafficabilty of the route was not
established, so PROSE adjusted the track layout - in
particular the superelevation. This ensured that the track
layout could be used. While at the beginning the project
exit strategy was still to be defined, PROSE was able to
work out a track layout which can be used by both vehicle
types GT-E and GT-N within the given scope.
The immediate benefit for WSB was being guaranteed,
during the planning phase, that the new route could be
used before the building work began. At the same time the
risk of consequences which could arise later, such as cracks
in the vehicle structure, occurring after the construction
project had been completed was minimised.
An indirect benefit is that the vehicle models are available
for further investigations without further initial effort.
Furthermore, the vehicle models have been documented
independently of the software, so that WSB now has
complete data sets of all relevant running dynamics
Manager Engineering Berlin