Abstract
In this paper, the impact of the monitoring quality on the performance of a maintained system is studied. A two-unit parallel system is considered for which the failure times of each unit can be not detected with a given probability. The optimal maintenance strategy must adapt to the non-detection events in order to take good decisions even if the units current state is not perfectly known. The evolution of the optimal maintenance strategy is studied when the monitoring quality deteriorates i.e. when the non-detection probabilities increase for both units. A monitoring cost is also considered which is decreasing in the non-detection probabilities and the trade off between the maintenance performance and the monitoring cost leads to optimize the monitoring quality level for both units.
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