Abstract
In this paper, we deal with the problem of optimal schedules of two periodic imperfect preventive maintenance (PM) policies which use two types of PM models discussed in Doyen and Gaudoin (IEEE Trans Reliabil 35:71–75, 1986). The PM action of one PM model has an effect on the relative wear-out wear-out since the last PM action, while the PM action of another PM model is effective in restoring global wear-out since equipment started operating. For each PM policy, we derive formulas to compute the expected cost rate per unit time and discuss the optimal PM schedule which minimizes the expected cost rate per unit time. We also compare analytically the optimal schedules of two PM policies for various cost structures and investigate numerically the sensitivity of the cost structures and PM models to optimal schedules.
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