ارايه يك سياست وارانتي تعمير - تعويض در حالت دوبعدي

In this paper, a method is developed to minimize the expected warranty servicing cost per item sold. In this method, to be decided to repair or replace a failed item. These kinds of items work in multi-state deteriorating and they may fail in every state. Zuo, Liu and Murthy (2000), presented a paper to minimize the expected warranty servicing cost under one-dimensional (Time) and nonrenewing warranty policy. But here, the warranty policy has two-dimensions (Time & Usage). The decision to repair or replace a failed item depends on two parameters, the deterioration degree of the item and the length of the residual warranty period. The optimality of these two parameters by minimizing the expected warranty servicing cost are examined by two methods, analytically and simulation. Then an offered algorithm is used as an approximating method for performing the warranty policy.