Imperfect maintenance in a generalized competing risks framework
Résumé
The aim of the paper is to present a general framework for the modelling of the process of corrective and condition-based preventive maintenance actions for complex repairable systems, which takes into account any kind of assumption for the efficiency of maintenance. On the one hand, the proposed model generalizes Kijima's virtual age models to the case where both preventive and corrective maintenances are present. On the other hand, it generalizes the classical competing risk model to maintenance actions which do not necessarily renew the system. A generalized virtual age model is defined by a sequence of effective ages which characterizes the effects of both types of maintenances, and a classical competing risk model which characterizes the dependency between both types of maintenances. Several particular cases of the general model are derived.