Journal
JOURNAL OF TRANSPORTATION ENGINEERING
Volume 139, Issue 9, Pages 941-948Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)TE.1943-5436.0000575
Keywords
Railroad tracks; Maintenance; Life cycles; Optimization; Railway track; Track maintenance; Track renewal; Life-cycle cost; Availability; Multiobjective optimization; Nonsorting genetic algorithm 2 (NSGA2)
Funding
- Portuguese Foundation for Science and Technology (FCT) [PTDC/SENTRA/112975/2009]
- FCT [SFRH/BD/51327/2010]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/51327/2010] Funding Source: FCT
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This paper proposes a multiobjective optimization approach for planning railway ballast, rail, and sleeper renewal operations. The objective is to support an informed decision that considers not only the railway track life-cycle cost (LCC) but also the track occupation times required to perform interventions. Two objective functions were minimized, as follows: (1)railway track unavailability caused by railway track maintenance and renewal operations, and (2)railway track components' LCC. Furthermore, to rationalize the renewal strategy, the model considers a multicomponent formulation that assesses, in time and space, the opportunistic combination of railway track renewal activities. A numerical application of the model on a real case study (Lisbon-Oporto line) is developed and discussed. The results show the interest of using this simple multiobjective optimization approach to obtain a decision-making process to support the scheduling of major railway track renewal works with an informed LCC-unavailability trade-off. (C) 2013 American Society of Civil Engineers.
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