Maintenance policy determination for a complex system consisting of series and cold standby system with multiple levels of maintenance action
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Abstract
Complex systems are categorized by large numbers of components and cut sets with different types or by statistical dependence between the components’ states. Considering this fact, selecting the best maintenance policy for a complex system is a complicated problem. This problem becomes more difficult when we are faced with several actions such as replacement or different repair levels with different cost and failure reduction effects, for each component. In this paper, we propose a mathematical bi-objective model that considers the corrective maintenance (CM) and preventive maintenance (PM) to minimize cost and maximize the reliability for a complex system consisting of series and standby components. Since the proposed model is non-deterministic polynomial-time hard (NP-hard), we utilize the non-dominated sorting genetic algorithm II (NSGA II) that is mostly used to solve the multi-objective models. The proposed NSGA II has a memory to obtain better results in comparison with common multi-objective evolutionary algorithm. The performance of the proposed model has been examined against a numeric instance to indicate the model’s efficiency and effectiveness.
Keywords
Maintenance Repair Genetic algorithm Optimization Non-dominated sortingPreview
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