The purpose of this paper is to develop a framework for the application of proportional hazard modelling to plant maintenance. Two regimes are investigated; a good-as-new regime where the hazard rate of the system is refreshed by either failure or preventive maintenance action. and a bad-as-old regime where only preventive maintenance action refreshes the hazard rate. The output of the analysis is the recommendation of optimal preventative maintenance plans under both of these regimes. Data for a local firm are used to illustrate the models. The inclusion of proportional hazard modelling is shown to yield improved maintenance plans in both regimes. A proposal for an adaptive scheme is made such that the maintenance plan can be adjusted as changing plant conditions warrant it.
An age model is proposed for modelling imperfect repairable systems operating under a non‐homogeneous Poisson framework. The imperfect repair model investigated here effectively includes good‐as‐new, imperfect repair and bad‐as‐old regimes that have appeared separately in reliability engineering literature. To incorporate the impact of the equipment's operating environment, proportional intensities assumptions are integrated into the age model. Maximum likeihood estimates are derived for the parameters of interest.
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