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For automated manufacturing systems (AMSs) without center resources that are one-unit resources shared by two or more maximal perfect resource transition circuits, the optimal Petri net-based polynomial complexity deadlock avoidance policies are synthesized in our previous work. Based on Petri net models of AMSs, this work focuses on the deadlock control problem for AMSs with center resources. First,...
This paper deals with constraint transformation problems in a system with unobservable events, which is modeled by Petri nets with unobservable transitions. First, the concept of an unobservable influence subnet is presented and its properties are studied. Next, based on the properties, an algorithm is proposed to transform a given generalized mutual exclusion constraint (GMEC) into an optimal admissible...
This paper addresses the supervisor synthesis on the forbidden state problem, in which the forbidden markings cannot be easily expressed as linear inequality constraints using reported methods. The system to be controlled is modelled by bounded Petri nets with uncontrollable transitions. Through the analysis of the reverse net, we obtain the weakly forbidden markings in order to deal with uncontrollable...
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