Case Study of Addis Ababa LRT IATP Signaling Subsystem RAM Analysis
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Date
2017-06
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Addis Ababa University
Abstract
With the growing interest in the railway sector, mainly because of energetic reasons (electrified
railway), there is a need to increase the efficiency of the railway lines. One way to optimize this
sector, signaling system plays an important role for safe running of trains. Railway signaling
systems ensure the safe operation of the railway network, and their reliability and maintainability
directly affect the capacity and availability of the railway network, in terms of both infrastructure
and trains. As most of its subsystem and components are working in open atmospheres, its
operations are sometimes very difficult to monitor. In this context, proper and efficient
maintenance activities can be useful to its effective operation.
This thesis seeks to study the reliability, availability and maintainability of a signaling system
with failure and repair data by Markov modeling. Then reliability and maintainability of every
sub systems are evaluated and graph is plotted for different time intervals. Moreover,
maintenance intervals at different reliability values are also evaluated. Steady state reliability of
different subsystems is also calculated. The model is verified with simulation of Addis Ababa
LRT signaling systems with different scenarios.
The analysis from this thesis shows that reliability of rail signal and switch machine are the
lowest among six subsystems, hence it is required more attention than other subsystems and
maintainability of onboard IATP equipment, beacon (balise), LEU, CBI, and rail signal is almost
good except onboard IATP, switch machine and CBI which is lowest. So onboard IATP, switch
machine and CBI are needs special consideration.
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Keywords
railway, signaling system, avaliability, reliability, maintenability, markov