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考虑FMS资源故障的一种死锁预防策略

李志武;丁伟;朱荣明   

  1. (西安电子科技大学 机电工程学院,陕西 西安 710071)

  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2005-12-20 发布日期:2005-12-20

A deadlock prevention policy for FMS using Petri nets in case of failures

LI Zhi-wu;DING Wei;ZHU Rong-ming

  

  1. (School of Electro-Mechanical Engineering, Xidian Univ., Xi′an 710071, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2005-12-20 Published:2005-12-20

摘要: 提出了利用Petri网对设备发生故障的柔性制造系统建模和死锁控制的一种方法.用故障库所、故障变迁和恢复变迁描述设备故障、修复以及重新投入工作的整个过程.在此基础上,研究了一种死锁控制策略:仅对基本信标添加控制库所,通过调整基本信标的控制深度来保证从属信标的可控性.由于基本信标个数远少于可清空信标个数,这种控制方法可大大简化Petri网控制器的结构.

关键词: 死锁预防, 柔性制造系统, 基本信标

Abstract: Abrupt failure of equipments in FMS is modeled by Petri nets, which can describe the behavior of malfunctioning equipment such as failure, recovery and rework with a failure place, a failure transition and a recovery transistion. Based on such modeling techniques, a new deadlock prevention method is presented, which controls elementary siphons only and makes dependent siphons P-invariant controlled by adjusting the control depth variables of elementary siphons. The structure of the resultant supervisors can be greatly simplified due to the fact that only the elementary siphons need to be explicitly controlled.

Key words: deadlock prevention, flexible manufacturing system(FMS), elementary siphon

中图分类号: 

  • TP278
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