Optimization of Condition-Based Maintenance Strategy for Stochastic and Continuous Deteriorating Systems

The paper focuses on modeling of a periodic inspection condition-based maintenance strategy for stochastic and continuous deteriorating single-unit systems. We consider the system's stochastic deteriorating process is Gamma Process and three types of maintenance including preventive maintenance, preventive replacement and corrective replacement. Preventive maintenance is imperfect maintenance which improves the deteriorating state of system randomly. Imperfect maintenance time is related to maintenance effectiveness. Preventive replacement and corrective replacement are perfect maintenance which makes systems as good as new. The object is to find the maintenance strategy which availability of the system limited by cost in a finite horizon is optimal and variables of maintenance strategy are inspection interval, preventive maintenance threshold and preventive maintenance times threshold. As a result, a simulation model based on Monte Carlo is developed and a numerical example is introduced.