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Dokuz Eylül Üniversitesi / Fen Bilimleri Enstitüsü / Endüstri Mühendisliği Bölümü

A high-level petri net based decision support system for real-time scheduling and control of flexible manufacturing systems: An object-oriented approach

Esnek imalat sistemlerinin gerçek zamanlı çizelgeleme ve kontrol problemi için yüksek seviye petri ağlarına dayalı bir karar destek sistemi: Nesneye yönelik bir yaklaşım

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Özet:

Summary:

Increasing automation and complexity of today's production systems affect theconstraints of real-world scheduling problems. To deal with this challenge, theexisting scheduling techniques are improved or new scheduling approaches aredeveloped in recent years. In this thesis, we attempt to propose an object-orientedapproach for modeling and analysis of shop floor scheduling problem of FMSs usinghigh-level PNs. The graphical nature and mathematical foundation has made Petri netbased methods appealing in real-time scheduling and control of flexiblemanufacturing systems (FMSs). In the proposed approach, we firstly construct anobject modeling diagram of an FMS and develop a heuristic rule-base to solve theresource contention problem, then formulate the dynamic behavior of the system byhigh-level PNs. The modeling methodology is illustrated by an FMS, and theproposed rule-based system is compared with several dispatching rules with respectto part flow time and tardiness related performance measures. Finally, the systemperformance under different operational configurations is analyzed to find out thebest implementing policy for the system under consideration.