General sequential imperfect preventive maintenance models

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)253-266
Journal / PublicationInternational Journal of Reliability, Quality and Safety Engineering
Issue number3
Publication statusPublished - Sep 2000


This paper presents new sequential imperfect preventive maintenance (PM) models incorporating adjustment/improvement factors in hazard rate and effective age. The models are hybrid in the sense that they are combinations of the age reduction PM model and the hazard rate adjustment PM model. It is assumed that PM is imperfect: It not only reduces the effective age but also changes the hazard rate, while the hazard rate increases with the number of PMs. PM is performed in a sequence of intervals. The objective is to determine the optimal PM schedule to minimize the mean cost rate. Numerical examples for a Weibull distribution are given. © World Scientific Publishing Company.

Research Area(s)

  • Improvement Factor, Minimal Repair, Optimal Policy, Preventive Maintenance (PM), Sequential Policy