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Siphon extraction for deadlock control in flexible manufacturing systems by using Petri nets

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Siphons can be used to characterise deadlock states and solve deadlock problems in Petri nets that model flexible manufacturing systems. This article presents a novel deadlock prevention policy for Petri nets using siphon extraction. At each iteration, a siphon extraction algorithm finds a maximal deadly marked siphon, classifies the places in it, and decides a necessary siphon from the classified places. Accordingly, the deadlock prevention policy adds a proper control place (CP) to make each necessary siphon marked or max-controlled until the controlled system is live. By adopting the classification of places, deciding necessary siphons, and adding the proper CPs, the proposed deadlock prevention policy avoids a complete siphon enumeration, adds a small number of CPs, and leads to a liveness-enforcing supervisor with a simple structure compared with closely related approaches in the literature. Finally, a case study shows its appealing behavioural permissiveness.
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Keywords: Petri net; deadlock prevention; flexible manufacturing system; liveness-enforcing supervisor; siphon

Document Type: Research Article

Affiliations: School of Electro-Mechanical Engineering,Xidian University, Xi'an710071, P. R. China

Publication date: August 1, 2011

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