期刊
RELIABILITY ENGINEERING & SYSTEM SAFETY
卷 168, 期 -, 页码 70-79出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ress.2017.04.006
关键词
Opportunistic maintenance; Delay time modelling; Imperfect inspection; False positive; False negative; Postponed replacement; Manufacturing
资金
- Spanish Ministry of Economy and Competitiveness [MTM2015-63978-P]
- CNPq (Brazilian Research Council)
We develop a delay time model for a one component system with postponed replacement to analyze situations in which maintenance might not be executed immediately upon discovery of a defect in the system. Reasons for postponement are numerous: to avoid production disruption or unnecessary or ineffective replacement; to prepare for replacement; to extend component life; to wait for an opportunity. This paper explores conditions that make postponement cost-effective. We are interested in modelling the reality in which a maintainer either prioritizes functional continuity or is not confident of the inspection test indicating a defective state. In some cases more frequent inspection and a longer time limit for postponement are recommended to take advantage of maintenance opportunities, characterized by their low cost, arising after a positive inspection. However, when the cost of failure increases, a significant reduction in the time limit of postponement interval is observed. The examples reveal that both the time to defect arrival and delay time have a significant effect upon the cost-effectiveness of maintenance at the limit of postponement. Also, more simply, we fmd that opportunities must occur frequently enough and inspection should be a high quality procedure to risk postponement. (C) 2017 Elsevier Ltd. All rights reserved.
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