Type of Document Master's Thesis Author DeLorenzo, Michael Author's Email Address mdeloren@vt.edu URN etd-402515359721531 Title NUCARS Modeling of a Freight Locomotive with Steerable Trucks Degree Master of Science Department Mechanical Engineering Advisory Committee
Advisor Name Title Mehdi Ahmadian Committee Chair Harry H. Robertshaw none Norman S. Eiss none Keywords
- NUCARS
- locomotive
- steerable
- trucks
- bogies
- parametric
Date of Defense 1997-05-20 Availability unrestricted Abstract The rail dynamics modeling package
NUCARS has been used extensively to model
freight cars. We have found that it can also be
used effectively to model freight locomotives.
This thesis discusses the development of a
NUCARS model to represent a six-axle freight
locomotive equipped with steerable trucks.
This includes separating it into a set of
individual bodies, representing the suspension
components as inter-body connections, and
validation of the computer model. This model is
then used to conduct a study of the impact on
tangent track stability and curving performance
of varying suspension parameters. It is found
that the presence of damping in the system
improves hunting stability, while increasing
wheel conicity is harmful to stability and varying
the flexicoiling stiffness has little effect. In
curving, the clearances between the axles and
truck frame are very important. Limiting these
clearances in the steerable truck causes it to
curve similar to a conventional straight
locomotive truck and increases both the track
force ratios and angles of attack. Increasing the
wheel conicity increases an axle's tendency to
align with the track and improves the
locomotive's curving performance. The lateral
stiffness of the inter-axle links and inter-motor
links has little effect on the curving of the
locomotive.
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