Imperfect condition-based maintenance policy for stochastic degradation systems in dynamic environments

Yuxi Mai, Mitra Fouladirad and Jianwu Xue

Reliability Engineering and System Safety, 2026, vol. 265, issue PB

Abstract: Production system operation is often affected by dynamic conditions and maintenance limitations. While most research focuses on preventive replacement maintenance, this paper introduces an imperfect condition-based maintenance policy tailored for systems subject to dynamic environmental conditions. The degradation of the system due to environmental changes is modeled using a Lévy process derived from a gamma process, compound Poisson process, and embedded Markov chain. Periodic inspections allow maintenance actions to be triggered based on the observed degradation level. When degradation exceeds a predefined threshold, imperfect preventive maintenance is performed, partially restoring the system’s degradation. To minimize the long-term average maintenance cost, we optimize the combination of inspection interval and preventive maintenance threshold using an enhanced Cyclic Coordinate Search algorithm. A case study on wind turbine bearings and sensitivity analysis demonstrate the proposed maintenance policy and underscore the value of proactive maintenance under harsh environmental conditions and increased maintenance effectiveness.

Keywords: Reliability; Condition-based maintenance; Dynamic environment; Stochastic degradation; Imperfect maintenance (search for similar items in EconPapers)
Date: 2026
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Persistent link: https://EconPapers.repec.org/RePEc:eee:reensy:v:265:y:2026:i:pb:s0951832025007835

DOI: 10.1016/j.ress.2025.111583

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