摘要
提出了一种用于可重构制造单元故障恢复的策略与方法,允许故障发生时,通过对用于正常操作控制的Petri网形式的监督控制器进行局部、临时性的修改,实现故障的恢复.首先,提出改进的网重写系统,可用于动态改变Petri网模型结构.然后,提出了基于改进的网重写系统的故障恢复方法,其中改进的网重写系统用于操作、引导Petri网监督控制器由错误状态进入正确状态.故障恢复后监督控制器的结构与期望属性维持不变.最后,以实例演示了该故障恢复方法的应用,证实了方法的有效性.
The strategy and method for recovering an error occurring in a reconfigurable manufacturing celI(RMC) are proposed by a partial and temporary modification on the supervisor in Petri net(PN) formalism for normal operation control. Firstly, the improved net rewriting system (INRS) is presented that offers a direct way to dynamical structural changes in a PN model. Subsequently, an INRS-based error recovery method is presented, where the INRS is used to operate a PN supervisor and induct it into a correct state from the error one. After error recovery the structure and expected properties of a resulting supervisors is naturally preserved. Finally, with help of an example, the error recovery method presented is illustrated and the result shows the validity of the method.
出处
《控制理论与应用》
EI
CAS
CSCD
北大核心
2010年第2期199-204,共6页
Control Theory & Applications
基金
supported in part by the China Postdoctoral Science Foundation Funded Project(20080431052)
关键词
故障恢复
PETRI网
网运算
可重构制造系统
监督控制
error recovery
Petri nets
net operation
reconfigurable manufacturing system
supervisory control