On Resource Arc for Petri Net Modelling of Complex Resource Sharing System |
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Authors: | K Hasegawa P E Miyagi D J Santos Filho K Takahashi L Ma M Sugisawa |
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Affiliation: | (1) Mitutoyo Coorporation, Yokohama, Japan;(2) University of São Paulo, Escola Politécnica, São Paulo, Brazil;(3) Tokyo Institute of Technology, Tokyo, Japan;(4) Oriental Motors Co., Tokyo, Japan;(5) Toin University of Yokohama, Yokohama, Japan |
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Abstract: | PFS-R – Production Flow Schema with Resources – is a novel graphical representation for complex resource sharing discrete production systems proposed in this paper. The PFS-R is an augmented version of the PFS (Production Flow Schema, previously proposed by the authors) which includes correspondences of system resources at each production step. The PFS-R is able to model system structures as well as system behaviours in a more simplified and transparent manner than ordinary Petri net representations. That is, the PFS-R solves an important drawback when actually adopting Petri nets as a design technique for intelligent manufacturing systems. First, the paper introduces the basic elements of PFS-R, and the equivalent transformations of PFS-R model into hybrid nets and Petri nets, taking into account the net conservativeness. Next, examples of discrete production systems to illustrate the effectiveness of PFS-R are presented. In addition, it is shown, using an example, that the correspondence between resources and production steps in the process flow has a tree structure, which is an effective way to evaluate whether or not the objects designed have a well-defined structure. |
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Keywords: | discrete production systems Petri nets Production Flow Schema (PFS) Mark Flow Graph (MFG) resource sharing |
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