Reliability, Availability and Maintainability Analysis of Addis Ababa Light Rail Transit Signaling System
| dc.contributor.advisor | Jigsa, Tesfaye (Mr.) | |
| dc.contributor.advisor | Abebe, Teklu (Mr.) | |
| dc.contributor.author | Alemu, Ayana | |
| dc.date.accessioned | 2019-01-14T12:29:33Z | |
| dc.date.accessioned | 2023-11-04T15:18:16Z | |
| dc.date.available | 2019-01-14T12:29:33Z | |
| dc.date.available | 2023-11-04T15:18:16Z | |
| dc.date.issued | 2017-07 | |
| dc.description.abstract | The railway network is a complex and distributed system with several technologies working together to fulfil the demands on capacity, speed and mobility to transport goods and passengers. The railway transportation system in Addis Ababa, the capital of Ethiopia plays a vital role in sustaining social and economic activities of a country by providing a safe, reliable, environmentally friendly and cost efficient means of transportation for the people. Following the safe, economical and practical principles, the design of Addis Ababa Light Rail Transit (AA-LRT) chooses a reasonable communication and signal system. Quality of transportation system critically depend on the reliability of signaling systems. Despite their numerous advantages, considerable train delays, cancellation, high maintenance cost and passenger dissatisfaction are the main disadvantages of signaling systems failures. Reliability, Availability, and Maintainability (RAM) analysis is a practical technique that uses failure and repair dataset obtained over a reasonable time for dealing with proper signaling system operation, maintenance scheduling, cost control, and improving the availability and performance of signaling systems. This research study and analyse RAM of AA-LRT signaling system with a historical database of failures and repairs of signaling systems was collected in the whole line of AA-LRT over a period of six months operation. After data analysis, it was revealed that the Axle counter subsystem has the highest failure frequency with relatively low availability and the switch has the lowest failure frequency with highest availability. A failure Mode and Effect analysis (FMEA) result shows that the switch is most critical subsystem to cause risk. Similarly, estimating the availability of failed signaling subsystems and equipments indicated that all subsystems have an acceptable availability level of above 96%. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/123456789/15693 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | AA-LRT | en_US |
| dc.subject | Signalling system | en_US |
| dc.subject | Axle Counter | en_US |
| dc.subject | Reliability | en_US |
| dc.subject | Availability | en_US |
| dc.subject | Maintainability | en_US |
| dc.subject | RAM | en_US |
| dc.subject | Failure Mode and Effect Analysis (FMEA) | en_US |
| dc.subject | Risk Priority Number (RPN) | en_US |
| dc.title | Reliability, Availability and Maintainability Analysis of Addis Ababa Light Rail Transit Signaling System | en_US |
| dc.type | Thesis | en_US |