Analysis of Effect of Train Overload on Disc Brake of AALRT
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Date
2015-05
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Addis Ababa University
Abstract
Changes in the train dynamics characteristics such as train weight will affect the train’s braking
performance and its ability to stop safely in braking situation. This paper studies about the disc
temperature and von misses stress of train over loading used in AALRT.
A transient thermal analysis has been carried out to investigate the temperature variation across the disc
using ANSYS 14.5. Further structural analysis is also carried out by coupling with thermal analysis.
A more realistic braking disc model for AALRT under various over load percentages, road grade level
and maximum travel speed of 70km/h is analyzed. The model of disc brake is done by CATIA software
and then simulation was followed using ANSYS 14.5 workbench. Results from this research showed
that the temperature and stress on disc brake during service brake at downhill train position and
unacceptable load condition has increased by 37.08
o
c and 56 Mpa from acceptable load and the same
train position. When a repetitive braking is applied the temperature and von misses stress during train
overload has increased by 37.07
o
c and 56 Mpa respectively.
Similarly, when the emergency brake is applied during normal and unacceptable load condition, the
temperature and stress on the disc has increased by 41.4
o
c and 51 Mpa in time of downhill track
position.
In general, overloading the train has the effect of increasing the temperature and stress induced in to the
disc brake rotor during braking
Description
Keywords
Disc brake, Temperature, Overloading, Von Mises stress, Light rail transit