Abstract
Based on a dependent and competing failure modes model for the system degradation, this chapter develops a maintenance cost model to assess and optimize a preventive maintenance policy involving inspection of the system, minimal repair (for nonmaintainable failure mode), imperfect maintenance (for maintainable failure mode), and perfect replacement (for the whole system). In particular, the chapter measures the time-dependent efficiency of the preventive imperfect maintenance actions through “improvement factors” which model explicitly the effect of preventive maintenance as the reduction of the failure rate of the maintainable failure mode. The behavior of an optimization procedure to find the optimal tuning of the maintenance policy is illustrated through numerical experiments.
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