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자연과학대학
통계학전공
Journal papers
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Improving classical optimal age-replacement policies for degrading items
Title
Improving classical optimal age-replacement policies for degrading items
Authors
Finkelstein M.
;
Cha J.H.
;
Langston A.
Ewha Authors
차지환
SCOPUS Author ID
차지환
Issue Date
2023
Journal Title
Reliability Engineering and System Safety
ISSN
9518-8320
Citation
Reliability Engineering and System Safety vol. 236
Keywords
Failure threshold
;
Gamma process
;
Inspection
;
Poison process
;
Preventive maintenance
Publisher
Elsevier Ltd
Indexed
SCIE; SCOPUS
Document Type
Article
Abstract
We consider items with observable at inspections degradation. Following an inspection, a decision is made whether to replace an item or to continue operation. When degradation is relatively small, it is cost-beneficial to continue operation and postpone the preventive maintenance. The innovative, probabilistically justified replacement policy defines the postponement in this case. It is based on comparison of the observed degradation with the specially defined reference values. Degradation is modeled by the increasing stochastic process, specifically by the Poisson counting process and by the homogeneous gamma process. Detailed illustrative numerical examples describing the main steps of the developed original methodology are provided. They also show that the proposed policy can result in a significant cost reduction and increase in the replacement times. © 2023 Elsevier Ltd
DOI
10.1016/j.ress.2023.109303
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