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.
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.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2005年第6期833-838,共6页
Journal of Xidian University
基金
国家自然科学基金资助项目(60474018)
教育部归国留学人员科研基金资助项目(2004-527)
西安电子科技大学青年工作站基金资助项目(XD-2002-04-001)
关键词
死锁预防
柔性制造系统
基本信标
deadlock prevention
flexible manufacturing system（FMS）
elementary siphon
