Speaker
Description
In this talk, we will consider maintenance strategies for coherent systems consisting of n components. The system is under a warranty policy with two consecutive phases under which the manufacturer’s commitment goes in two different forms. In Phase I, upon the system failure, the failed components are replaced with new ones and a corrective maintenance is performed on the whole system. If the system failure occurs during Phase II, only minimal repair is performed on the components. Following expiration of the warranty time, the customer is solely responsible for maintaining the system who, for a fixed length of the time period, replaces the failed components and preventively maintains the system at the end of such period. During the maintenance period, the same maintenance as that of Phase I of the warranty period is conducted. Such a maintenance model was considered in our previous work for a coherent system consisting of identical components. Here, we consider the systems consisting of heterogeneous components which is a more realistic assumption in some practical situations. We investigate, from the manufacturer’s and customer’s perspectives, the optimal length of each phase in the warranty period, and the optimal planned time of preventive maintenance based on some imposed cost functions, respectively. The results were developed by using the survival signature-based reliability representation of the system lifetime. This representation enables us to propose the cost functions such that at time of the performance of the maintenance action, the repairs/replacements are carried out not only on the entire system but also on each component.