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Necessary and sufficient liveness condition of GSPR Petri nets

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  • GaiYun Liu
  • Kamel Barkaoui

Abstract

Structural analysis is one of the most important and efficient methods to investigate the behaviour of Petri nets. Liveness is a significant behavioural property of Petri nets. Siphons, as structural objects of a Petri net, are closely related to its liveness. Many deadlock control policies for flexible manufacturing systems (FMS) modelled by Petri nets are implemented via siphon control. Most of the existing methods design liveness-enforcing supervisors by adding control places for siphons based on their controllability conditions. To compute a liveness-enforcing supervisor with as much as permissive behaviour, it is both theoretically and practically significant to find an exact controllability condition for siphons. However, the existing conditions, max, max′, and max″-controllability of siphons are all overly restrictive and generally sufficient only. This paper develops a new condition called max*-controllability of the siphons in generalised systems of simple sequential processes with resources (GS3PR), which are a net subclass that can model many real-world automated manufacturing systems. We show that a GS3PR is live if all its strict minimal siphons (SMS) are max*-controlled. Compared with the existing conditions, i.e., max-, max′-, and max″-controllability of siphons, max*-controllability of the SMS is not only sufficient but also necessary. An example is used to illustrate the proposed method.

Suggested Citation

  • GaiYun Liu & Kamel Barkaoui, 2015. "Necessary and sufficient liveness condition of GSPR Petri nets," International Journal of Systems Science, Taylor & Francis Journals, vol. 46(7), pages 1147-1160, May.
    • Handle: RePEc:taf:tsysxx:v:46:y:2015:i:7:p:1147-1160
    DOI: 10.1080/00207721.2013.827257
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    References listed on IDEAS

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    1. Liang Hong & Daniel Chao, 2013. "Controllability of control and mixture weakly dependent siphons in SPR," International Journal of Systems Science, Taylor & Francis Journals, vol. 44(8), pages 1377-1385.
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    Cited by:

    1. František Čapkovič, 2023. "Dealing with Deadlocks in Industrial Multi Agent Systems," Future Internet, MDPI, vol. 15(3), pages 1-25, March.

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