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- Type of Document: M.Sc. Thesis
- Language: English
- Document No: 40289 (01)
- University: Sharif University of Technology, Loleo University of Technology
- Department: Industrial Engineering
- Advisor(s): Modarres Yazdi, Mohammad
- Abstract:
- Despite of existing advanced routines and concepts of Maintenance, which are imported along with Metro System hardware, and valuable experience of maintenance personnel, which has been gathered during years of operation, there are some undeniable shortages in current Maintenance Policy of Tehran Metro. These shortages can be classified in two major groups: first, lake of reasonability in performing maintenance tasks and second, general reluctancy about runnig scientific works. Treating those two deficiencies, can improve the performance of Tehran Metro Maintenance System dramatically. Above mentioned shortages can be seen in whole Maintenance System of Tehran Metro, for the reason of having been engaged in Signaling System for a long time, and the vitality of this system, it is chosen for the case of study and research. Regarding to the subject of this thesis which is Maintenance Improvement of Signaling System in Tehran Metro, the scope of Improvement encompasses five major fields of 1. Study, consists of going through Fail-Safe definitions and descriptions as the identical characteristic of the Signaling Systems, Fail-Safe design, implementation and function, Blind Spot realization, exploration and consideration, and reviewing the literature related to Accelerated Life Test and Degradation Life Test, 2. Calculations, consider giving definitions and utilizing age-reliability relations, designing statistical experiments and running ALT and DLT tests for Point Machine Subsystem, 3. Designs, concerned about an ALT test tool for relays in order to obtain age-reliability relation of a common used part in Signaling system, and a Condition Monitoring tool for the surveillance of Power Supply subsystem input, 4. Design Modification for eliminating the most seen failure in relays which is contact erosion, and finally 5. Preventing Maintenance Revision which covers Automatic Train Protection Track Circuit subsystem un-necessary Preventive Maintenance actions elimination.
- Keywords:
- Condition Monitoring ; Preventive Maintenance ; Accelerated Life Test ; Design Modification ; Degradation Life Test ; Fail-Safe ; Railway Signaling System
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