Imperfect maintenance decision for a deteriorating system based on the combined shock model

In this paper, a combined shock maintenance model is proposed for the deteriorating system, and the imperfect maintenance decision based on the replacement policy N is studied. This approach assumes that the system has two kinds of failure conditions, and the combined shock model is established by combining with the δ-shock model and accumulative shock model. The optimal replacement policy N is determined by using this combined model, and the average cost in life cycle is minimized. Finally, a numerical case study is provided to validate the feasibility of the proposed method.