Analysis of The Performance of Disc Brake System of Addis Ababa Light Rail Transit Using Temperature and Coefficient of Friction as A Parameter

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Date

2014-09

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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 µ. 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.

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Keywords

AALRT, coefficient of friction, parameter, disc brake system

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