Analysis of The Performance of Disc Brake System of Addis Ababa Light Rail Transit Using Temperature and Coefficient of Friction as A Parameter
No Thumbnail Available
Date
2014-09
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Addis Ababa University
Abstract
Most of railroad passenger vehicles in the world use disc brake system which is mounted
on the axle but some uses brake shoe directly applied onto the wheels treads. This system
causes wheel heating, which in turn gives rise to thermal stresses and loss of mechanical
strength. On the contrary, brake disc and pads, do not heat the wheels as shoe brakes do.
Braking performance of trains is mainly affected by temperature and ยต. This Research
work presents the development of a modular tool for the prediction of passengers train
braking performance. Particular attention is devoted to the accurate prediction of stopping
distance, determination of nodal temperature and friction coefficient, considering
different loading and operating conditions, necessary to verifying safety requirements for
the movement of trains as a whole. Analysis was done on thermal transient of a brake
disc for railway vehicles using finite element analysis method (FEM) simulation software
called ANSYS. Performed analysis deals with two cases of braking; the first case
considers service braking to a standstill; the second case considers emergency braking to
a standstill and maintaining a constant speed. Once the model of the disc brake is done on
solid works for simulation purpose, then simulation was followed using Multiphysics
Ansys workbench. In general analysis results shows that, the performance of the disc
brake is highly affected during emergency brake due to minimum stopping distance and
delay time, results the increment value of coefficient of friction; although the nodal
temperature is also high compared to service braking condition but it is less than the
maximum temperature achieved by the disc in the literature review. However for the case
of service brake its performance is good for all stations. Therefore validation results were
encouraging using experiments, dynamometer test, and allowed a more accurate
identification of the friction factor and temperature influence on braking performance of
passenger trains as a whole.
Description
Keywords
AALRT, coefficient of friction, parameter, disc brake system