Wheel Rail Interaction Modeling on Rail Vehicle System Lateral Dynamics
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Date
2014-09
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Abstract
The long history of railway engineering provides many practical examples of dynamic
problems which are unique to railway vehicles. One of the railway vehicle's dynamic
problems is the lateral dynamic which is mainly arising from wheel rail contact
condition. In the early time, to analyze and formulate such kinds of railway vehicle
dynamics scientists had been using different experimental methods such as roller rigs
and roller coasters. Even though such experimental methods are most efficient and
error free, they are very costly and need some time. But now a day there are different
computer packages used to study and simulate the dynamic behavior of a railway
vehicle (ADAMS/RAIL, SIMPAKC and Vampire). These computational packages
are very efficient in both cost and time but they are not more flexible and require indepth
knowledge
to
run
them.
So
this
paper
tried
to
make
the
computational
tool
more
flexible
and
easy to
use
with
basic
computer
knowledge
In the work presented, mathematical model and computational tool used for the
dynamic simulation of railway vehicle wheelset systems was developed using
multibody systems formulations. The model based on the multibody techniques
developed by Shabana. With respect to other exciting methodologies the proposed one
make use of a combined frame of references that permit the use of independent
coordinates, without the possibility to have singularity configurations depending on
the rotation sequence. Lagrangian Equation of motions such as virtual work and
kinetic and potential energy are used to develop the equation of motion. Finally a
MATLAB program is developed to analyze the dynamic behavior of the wheelset at
different velocities on a straight track. The program was designed to considering the
flexibility of different configuration of railway vehicles. The model used was applied
to make a simulation for single wheelset.
The analysis were made for different velocities, lower than the critical in which the
vehicle responded in stable form, and higher than the critical at which the instability
of the vehicle was studied. The obtained results of the dynamic response for a defined
track composed of tangent segment is analyzed and compared with one published
paper.
Description
Keywords
Wheel-rail, modeling, ateral dynamics