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A genetic algorithm for multiple objective dealing with exceptional elements in cellular manufacturing
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DOI：10.1080/09537280310001597334.png)
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Abstract
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Cellular Manufacturing ( CM) is an important application of Group Technology (GT) in which families of parts are produced in manufacturing cells or a group of various machines, which are physically close together and can entirely process a part family. The manufacturing system established based on such an idea is called Cellular Manufacturing System (CMS). A major problem associated with many CMSs is the existence of Exceptional Elements (EEs), i.e. bottleneck machines and exceptional parts. These are machines/parts that cannot be exclusively assigned to a machine cell/part family. In this paper a new model is presented for dealing with the EEs in the form of a Multi-objective Optimization Problem ( MOP). This model aims to minimize: ( 1) intercellular parts movements, ( 2) total cost needed for machine duplication and part subcontracting, ( 3) the system's under-utilization, and ( 4) deviations among the cells' utilization. Attaining an ideal solution, which is optimal to all of the objectives is prohibited, as they conflict with each other. Hence, a Multi-Objective Genetic Algorithm (MOGA) is developed to provide the decision-maker with a set of non-dominated or Pareto-optimal solutions. Comparisons between the developed MOGA and three other MOGAs show its viability in three performance aspects, namely: quality, diversity and CPU time.
Keywords:
cellular manufacturing systems
exceptional parts
bottleneck machines
multi-objective optimization
genetic algorithms
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