Imperfect Maintenance Policy Considering Positive and Negative Effects for Deteriorating Systems With Variation of Operating Conditions

Abstract

This brief develops a degradation-based imperfect maintenance policy considering both positive effect and negative effect for a deteriorating system with variations of operating conditions. The proposed method improves the positive effect on the imperfect maintenance, which further considers the impact of resource on the distribution function of the positive effect after each maintenance process. The positive effect induces the system state into a random interval which is related to maintenance resource applied into each preventive maintenance action and actual maintenance times. Meanwhile, a new negative deteriorating effect model for describing the impacts of imperfect maintenance actions is established. The new model considers that the degradation rate increases after each imperfect maintenance process; meanwhile, it includes the impacts of variations of operating condition bringing to the degradation rate which is described as a distribution subjected to stress as well. Therefore, a condition-based adaptive maintenance policy is applied for a deteriorating system. The optimal maintenance cost allocation and maintenance threshold are determined by maximizing an availability function. Finally, a numerical example is illustrated to demonstrate the application of our maintenance model and policy.