ABSTRACT
In this paper, an imperfect condition-based maintenance policy is proposed for a gradually deteriorating system. This system can represent a large structure such as a bridge, a dike or a pipeline and its failure would have catastrophic consequences not only on humans but also on the environment. The failure of such a system should be avoided and that is why the system must be preventively repaired. The proposed maintenance policy considers imperfect preventive maintenance actions. Hence, each preventive maintenance action does not lead the system to be as good as new after maintenance. To model the impact of imperfect preventive maintenance actions on the system, two improvement functions are suggested. The aim of this paper is to compare the proposed improvement functions and to evaluate the imperfect condition-based maintenance policy, on a finite time span, for each improvement function.
