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Track Surveying and Speed Optimization (Case Study Addis Ababa – Adama Line)

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dc.contributor.advisor Mequanent, Mulugeta (Mr.)
dc.contributor.author Fayera, Mosisa
dc.date.accessioned 2019-02-01T12:55:43Z
dc.date.available 2019-02-01T12:55:43Z
dc.date.issued 2016-02
dc.identifier.uri http://localhost:80/xmlui/handle/123456789/16186
dc.description.abstract Speed Optimization is a means of improving the geometric alignment, infrastructure and construction materials and structure performance during the working cycles under some manufacturing, operational and failure conditions as well as cost limitations. The new Ethiopian national railway network design speed is about 120Km/h which is too low when compared with some developed countries rail speed. Construction of new high speed line needs huge investment that may not be viable for a developing country like Ethiopia and optimization of existing line using different techniques is the available option. The major anticipated problems/demand behind for high speed for the country national rail network and Addis Ababa – Adama line in particular are for that it is Competitive with toll road of same speed, located along the development axis area of Ethiopian economy, located along country’s industrial zone highly polluted by industry emission, national image building, attracting investor and delay of freight at sea port. Optimization of speed were done by enquiring and analyzing existing track geometry and track super structures, construction materials and other speed related parameters to identify restrictive sections and the maximum allowable speed of the line. Geometric analysis and design were done by Bentley Inrail software in the optimization process and finite element methods were used for analyzing of track component response under optimized speed. From the analysis result, the existing track construction materials and infrastructures are within recommendable limit for introducing high speed. The geometry of the track is allowable for speed up to 130km/h by modifying cant of sharp horizontal curves. Two optimization techniques were identified for the study. The first optimization technique is introducing tilting coach and the second is upgrading existing geometric alignment. On the existing track, 160km/h speed can be operated by introducing tilting coach without upgrading the track alignment. It is possible to achieve 16okm/h for conventional train by upgrading sharp horizontal curves less than 1325m. By combination of both techniques 205km/h speed can be achieved, but due to vertical curve limitation speed more than 170km/h is not viable on the line. By all optimization techniques, the recommendable level of optimization percentage is 33%. Introducing tilt coach technology is recommendable technology as it is easy for application and economically feasible option. Since the entire Ethiopian national rail network are similar, the work done for Addis Ababa – Adama line can be projected for other routes to increase consistency system throughout the country. en_US
dc.language.iso en_US en_US
dc.publisher Addis Ababa University en_US
dc.subject Speed optimization en_US
dc.subject conventional train en_US
dc.subject tilting coach en_US
dc.subject allowable design speed en_US
dc.subject high speed en_US
dc.subject track geometry en_US
dc.subject Bentley Inrail Software en_US
dc.title Track Surveying and Speed Optimization (Case Study Addis Ababa – Adama Line) en_US
dc.type Thesis en_US

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