Production Scheduling for Precast Plants using a Flow Shop Sequencing Model |
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Authors: | W T Chan Hao Hu |
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Affiliation: | 1Associate Professor, Dept. of Civil Engineering, National Univ. of Singapore, Singapore?119260. 2Graduate Assistant, Dept. of Civil Engineering, National Univ. of Singapore, Singapore?119260.
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Abstract: | There are two alternatives for production organization in precast factories—namely, the comprehensive method and the specialized method. Production scheduling under the specialized alternative has been found to be a difficult optimization problem if heterogeneous elements are involved. A flow shop sequencing model that incorporates actual constraints encountered in practice is proposed for this difficult case of precast production scheduling. The model is solved using a genetic algorithm (GA). The traditional minimize makespan and the more practical minimize tardiness penalty objective functions are optimized separately, as well as simultaneously using a normalized weighted GA. Comparisons between the GA and classical heuristic rules show that the GA can obtain good schedules for the model, giving a family of solutions that are at least as good as those produced by the use of heuristic rules. |
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Keywords: | Manufacturing facilities Productivity Scheduling Algorithms Management methods Concrete precast |
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