Multi-objective Inspection Optimization of Periodically Maintained Multi-failure Mode System

Abstract

This paper examines the multi-objective availability and cost optimization of a periodically inspected system having K independent failure modes. The system is maintained not only at each failure but also at each inspection resulting in as good as a new unit in either event. Particularly, perfect preventive maintenance is done at every inspection and perfect corrective maintenance is done on failures. The main feature of the suggested model is that the inspection as well as the maintenance time is non-negligible. The evaluation of the generic expressions for long-term average cost and limiting availability of the system undergoing periodic inspections is the main objective of this research. The multi-objective optimization issue of attaining the maximum availability meanwhile achieving the minimum cost is solved by firstly generating the Pareto optimal solutions using particle swarm optimization and then selecting the best compromise solution using a fuzzy approach. A numerical illustration of Remote Power Feeding System is also presented to highlight the applicability of the proposed work at last.

Keywords

Multi-objective optimization (MOO) / periodic inspection / maintenance / availability / particle swarm optimization (PSO) / fuzzy method

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