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Computer Integrated Manufacturing Systems. 2013, (07) Core

Design method for maximum permissive liveness supervisory controller based on S~3PRChinese Full Text

YAN Ming-ming1,ZHAO Mi2(1.School of Electro-Mechanical Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China;2.School of Mechanical and Electrical Engineering,Shihezi University,Shihezi 832002,China)

Abstract: To solve the problem of deadlock prevention for System of Simple Sequential Process with Resources（S3PR）,apolicy to design the deadlock-free supervisor with the maximum permissive system was proposed based on siphons.Using the iterative method,a set of Generalized Mutual Exclusion Constraints（GMEC）were added into all emptiable Strict Minimal Siphons（SMS）existed in the net system so as to make the number of siphons constrained in a given up-limited value,which transformed the siphon based deadlock prevention strategy into the monitoring problem of forbidden state.Thus all forbidden states in the controlled net system could not be reached,and the controlled network had maximum permissive behavior.The effectiveness of proposed policy was verified by examples of flexible manufacturing system,and it was especially suitable for the net model with relatively simple structure and high quality requirement of the reachable states.
Keywords：

flexible manufacturing systems; deadlock prevention; Petri nets; siphon; generalized mutual exclusion constraints;

  • DOI：

    10.13196/j.cims.2013.07.110.yanmm.018

  • Series：

  • Subject：

  • Classification Code：

    TP273

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