Abstract
Deadlock control approaches based on Petri nets are usually implemented by adding control places and related arcs to the Petri net model of a system. The main disadvantage of the existing policies is that many control places and associated arcs are added to the initially constructed Petri net model, which significantly increases the complexity of the supervisor of the Petri net model. The objective of this study is to develop a two-step robust deadlock control approach. In the first step, we use a method of deadlock prevention based on strict minimal siphons (SMSs) to create a controlled Petri net model. In the second step, all control places obtained in the first step are merged into a single control place based on the colored Petri net to mark all SMSs. Finally, we compare the proposed method with the existing methods from the literature.
Highlights
An automated manufacturing system (AMS) is a conglomeration of robots, machine tools, fixtures, and buffers
To make make the the work work more more solid solid and and well-positioned, well-positioned, we have developed a Trust-based colored controlled Petri net (TCCPN) [26,27,28,29]
After running and simulating the Petri net model in MATLAB, we obtained the results summarized in Tables 2 and 3
Summary
An automated manufacturing system (AMS) is a conglomeration of robots, machine tools, fixtures, and buffers. Several types of products enter the manufacturing system at separate points in time; the system can process these parts based on a specified sequence of operations and resource sharing. Petri nets are an excellent mathematical and graphical tool suitable for modeling, analyzing, and controlling deadlocks in AMSs [5,6]. The behavior and characteristics of an AMS (such as synchronization, conflict, and sequences) can be described by using Petri nets. To address the deadlock problem in AMSs, several approaches with Petri nets exist. These approaches are categorized into three strategies: (1) deadlock detection and recovery, (2) deadlock prevention, and (3) deadlock avoidance [7,8]
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