DISCRETE MAINTENANCE MODELS OF ARMOUR BLOCK FACILITY UNDER PEAKS-OVER-THRESHOLD

摘要

It applies some results of discrete maintenance models to an armour block facility. The armour block facility is subject to waves which occur at a homogeneous Poisson process. As a result, the facility's resistance deteriorates with elapsed time. The deterioration process is assumed as a gamma process. The facility is broken by a strong shock when a load of the shock exceeds the resistance level. The broken facility is maintained immediately as corrective maintenance. In order to reduce a total maintenance cost, we carry out preventive maintenance. As a criterion for maintenance decision making, it adopts a total expected maintenance cost over an infinite time horizon. A necessary condition to minimize the criterion is discussed. Finally, some numerical examples are given.