Maintenance optimization of a system subject to two-stage degradation, hard failure, and imperfect repair

Tom Ivar Pedersen, Xingheng Liu and Vatn, Jørn

Reliability Engineering and System Safety, 2023, vol. 237, issue C

Abstract: This paper develops a condition-based maintenance (CBM) policy for a two-component system subject to continuous degradation and hard failure. The cumulative degradation of one of the components is modeled by a two-stage degradation process, which then determines the failure probability of the other component via a proportional hazards model. Imperfect repair reduces the degradation level without changing the degradation rate, whereas preventive renewal restores both components to the as-good-as-new condition. The CBM policy is optimized by finding the imperfect repair threshold and the preventive renewal time that minimize the long-run cost rate. We propose a numerical procedure to find the solution without Monte Carlo simulation. Furthermore, the modeling framework is flexible enough to account for maintenance delay and opportunistic maintenance. A case study of the maintenance of a cooling system taken from a company in the process industry is presented to illustrate the applicability of the proposed maintenance policy.

Keywords: Maintenance optimization; Imperfect repair; Hard failure; Condition-based maintenance (CBM); Long-run cost rate; Process industry (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:reensy:v:237:y:2023:i:c:s0951832023002272

DOI: 10.1016/j.ress.2023.109313

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