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Optimal planned maintenance with salvage cost for a two-unit standby redundant system
Authors:Tadashi Dohi  Shunji Osaki  Naoto Kaio
Affiliation:Department of Industrial and Systems Engineering, Hiroshima University, 4-1 Kagamiyama 1 Chome, Higashi-Hiroshima 724, Japan;Department of Management Science, Hiroshima Shudo University, 1717 Ohtsuka Numata-cho, Asaminami-ku, Hiroshima 731-31, Japan
Abstract:This paper considers the optimal spare ordering policies for a cold standby redundant system with two dissimilar units. Especially, the planned maintenance schedule with salvage cost is discussed. The failure time distributions for respective units are assumed to be arbitrary. By applying the expected cost per unit time in the steady-state and the stationary availability as criteria of optimality, the optimal ordering policy minimizing or maximizing each criterion is obtained under some economical and/or physical assumptions. Finally, numerical examples are presented, and the effect of the failure time distributions for the optimal ordering policy is examined in detail.
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