A fuzzy logic modelling of dynamic scheduling in FMS |
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Authors: | P Srinoi F Ghotb |
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Affiliation: | 1. Department of Mechatronics Engineering , Pathumwan Institute of Technology , 833 Rama 1 Road, Bangkok 10330, Thailand;2. Industrial Research Institute Swinburne (IRIS), Swinburne University of Technology , PO Box 218, Hawthorn, VIC 3122, Australia |
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Abstract: | This paper is concerned with scheduling in flexible manufacturing systems (FMSs) using a fuzzy logic (FL) approach. Four fuzzy input variables: machine allocated processing time, machine priority, due date priority and setup time priority are defined. The job priority is the output fuzzy variable, showing the priority status of a job to be selected for next operation on a machine. The model will first select the machines and then assign operations based on a multi-criteria scheduling scheme. The performance of the approach is compared against established methods reported in the literature. The performance measures considered average machine utilisation, meeting due dates, setup times, work in process and mean flow times. The test results demonstrate the superiority of the fuzzy logic approach in most performance measures. |
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Keywords: | FMS scheduling Fuzzy scheduling Multicriteria scheduling |
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