Development of Maintenance Model and Strategy For Addis Ababa Light Railway Transport (AALRT) Railway Track Line
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Date
2016-12
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Addis Ababa University
Abstract
There is a need among transportation maintenance decision makers for a better understanding of
the long-term behavior of railroad tracks. The use of accurate techniques (maintenance model
and strategy) to predict track conditions increases track safety and maintenance effectiveness as
well as reduce maintenance costs through improve planning.
This paper describes the track maintenance model and strategyrelevant for Addis Ababa Light
Rail Transit.By using reliability model with weibull distribution, the expected number of critical
and degraded failures are determined. Then three failure mechanisms are determined and the rate
of critical and degraded failures is determined for each failure mechanism. Finally the governing
value of critical and degraded failure are chosen to determine reliability parameters such as mean
time to failure(MTTF),mean time to detect(MTTD),mean time before failure(MTBF),mean time
to repair(MTTR) and preventive maintenance index(Ipm).
The analysis result shows that, the Frequency of critical failure is reduced by 56%by conducting
three inspection per year. And also the Mean time until any failure is detected by conducting
inspection at every four months of interval for AALRT Railway track line (MTBF) is obtained
as 2.55 years.
Then after, four maintenance strategies are developed for AALRT. These are: Repair as soon
as the component is identified to be in a state where repair is necessary, repair when the
component is identified in the state where a major repair is required, repair when the component
is identified as being in the state where renewal is needed and no repair, component is allowed to
deteriorate without any intervention.
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Keywords
Maintenance model or strategy, Degraded failure, Critical failure, mean time to failure, mean time before failure, repair