Metaheuristic-based inspection policy for a one-shot system with two types of units |
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Authors: | Won Young Yun Li Liu Young Jin Han |
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Affiliation: | 1. Department of Industrial Engineering, Pusan National University, Busan, 609-735, Korea
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Abstract: | In this paper, we address an inspection policy problem for a one-shot system with two types of units, namely, Type 1 units that fail at random times and Type 2 units that degrade with time. Interval availability and life cycle cost are used as optimization criteria and estimated by simulation. We determine inspection intervals, preventive replacement ages of Type 1 units, and preventive maintenance thresholds of Type 2 units that have minimal life cycle cost and satisfy the target interval availability during inspection periods. A simulation-based optimization procedure using a hybrid genetic algorithm is proposed to find near-optimal solutions. Numerical examples are studied to investigate the effects of model parameters on optimal solutions and compare the hybrid genetic algorithm with the general genetic algorithm. |
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