Volume 4, Issue 2, April 2019, Page: 30-43
Economic Life Cycle versus Lifespan – A Case Study of an Urban Bus Fleet
Hugo Raposo, Department of Mechanical Engineering, Centre for Mechanical Engineering, Materials and Processes, Coimbra University, Coimbra, Portugal;Department of Mechanical Engineering, Coimbra Institute of Engineering, Coimbra, Portugal
José Torres Farinha, Department of Mechanical Engineering, Centre for Mechanical Engineering, Materials and Processes, Coimbra University, Coimbra, Portugal;Department of Mechanical Engineering, Coimbra Institute of Engineering, Coimbra, Portugal
Inácio Fonseca, Department of Mechanical Engineering, Centre for Mechanical Engineering, Materials and Processes, Coimbra University, Coimbra, Portugal;Department of Mechanical Engineering, Coimbra Institute of Engineering, Coimbra, Portugal
Diego Galar, Department of Civil, Environmental and Natural Resources Engineering, Lulea University of Technology, Lulea, Sweden
Received: Oct. 17, 2018;       Accepted: Nov. 7, 2018;       Published: Jun. 10, 2019
DOI: 10.11648/j.eas.20190402.12      View  161      Downloads  18
Abstract
The maintenance policy and the quality of service throughout the bus’s life cycle can be measured through their costs along time that, when evaluated using Lifespan or Economic Life Cycle methods, allow to determine the renewal or the replacement time. The paper discusses these two models, using real data from an urban bus fleet company. The maths that supports the models are presented. They are considered the functioning and maintenance costs, and also the apparent rate. The Life Cycle Cost of an urban transport bus is strongly dependent on the policy and quality of its maintenance, from which it depends on its reliability and availability. The final result is reflected on its Life Cycle Cost, that can be evaluated through the Lifespan or the Economic Life Cycle methods. Other aspects that can be considered are the fuel costs and the type of terrain, because they are intrinsically interrelated and have a strong effect on costs, namely because they imply strong variation in the bus’s consumption and in their maintenance costs. As the company considered in the case study has a poor maintenance policy, it makes the analysis challenging, making difficult to compare the economic life cycle with the lifespan method in this situation. However, the results and conclusions that are taken from them are obvious, what demonstrates the models’ utility and robustness.
Keywords
Equipment Removal, LCC, Lifespan, Assignment, Condition Monitoring, Scheduled Maintenance
To cite this article
Hugo Raposo, José Torres Farinha, Inácio Fonseca, Diego Galar, Economic Life Cycle versus Lifespan – A Case Study of an Urban Bus Fleet, Engineering and Applied Sciences. Vol. 4, No. 2, 2019, pp. 30-43. doi: 10.11648/j.eas.20190402.12
Copyright
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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