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Modeling with colored timed object-oriented Petri nets for automated manufacturing systems

This paper is devoted to the synthesis of "well behaved" (live) nets. The work focuses on the synthesis of a subclass of nets that appear in the modeling of a wide set of flexible manufacturing systems (FMS). Basically, these nets are composed of a set of sequential processes that share a set of common resources (with some constraints in their use). Among the set of problems related to FMS, we are going to concentrate on deadlocks. In this paper, we show that for the systems under consideration it is possible to know, from a structural point of view, if a deadlock is reachable. We also show that this knowledge can be obtained in linear time (with respect to the size of the PN model). The result can be used in order to have a quick answer to whether a given configuration is correct or not, to study if such a configuration exists or not and to conclude if some deadlock control policy is needed.

A Class of Well Structured Petri Nets for Flexible Manufacturing Systems

Protocol synthesis attempts to formalize and automate the process of designing communications protocols. Protocol design is an important step in the communications software or protocol engineering development process. Protocol synthesis has been addressed extensively by many researchers around the world, and various approaches have been proposed: from the stepwise refinement of a high level requirements specification to the automatic generation starting from a formal service specification. In this paper, we introduce protocol synthesis in the context of the protocol engineering process, and we briefly describe and survey the main features of the proposed synthesis methods. Tables summarizing this survey are also provided.

Synthesis of communications protocols: an annotated bibliography

The paper discusses a multi-agent system for robot-soccer. The system consists of a supervisory controller, and controllers for attack, defense and goalie robots. Real time vector field based path planning, Petri-net theory and Q-learning technique are used in the design. Robot-soccer system has a dynamic environment. A soccer robot has to take an appropriate decision based on environment situation. The supervisor assigns the role of each robot. Experimental study verifies applicability and efficiency of the developed controller scheme.

/pdf/vector-field-based-path-planning-and-petri-net-based-role-2lswjtyu2r.pdf

Vector Field Based Path Planning and Petri-Net Based Role Selection Mechanism with Q-Learning for the Soccer Robot System

The modelling or synthesis of ordinary Petri nets has been recognized as a key step for applying Petri nets to performance analysis, control and simulation of industrial production systems. This paper addresses this synthesis problem by adopting a global and incremental synthesis approach: the knitting technique for manufacturing systems. The knitting technique has been applied to Petri net modelling and analysis of communication networks. The idea behind this technique is to introduce details in an incremental way, i.e. by adding new paths and/or cycles to a Petri net. At each step the Petri net model grows according to certain rules which will guarantee such system properties as boundedness, liveness and reversibility

/pdf/extending-the-knitting-technique-to-petri-net-synthesis-of-1rqk7q0i4y.pdf

Extending the Knitting Technique to Petri Net Synthesis of Automated Manufacturing Systems

The general Petri net (GPN) is useful for modeling flexible manufacturing systems with multiple robots and workstations [15] and for parallel programs [8]. A problem of using reachability analysis for analyzing Petri nets (PN) is the large number of states generated. Most of the existing synthesis techniques do not deal with GPN. Koh et al.[15] invented a synthesis technique for GPN. We propose to improve their achievement by adding the simple Arc-ratio rules to Yaw's knitting technique [37, 38, 39] based on the notion of structure relationship together with new path generations, which mark the most distinct feature compared with other approaches. The synthesis rules and procedures of how to update the temporal matrix and structure synchronic distance are presented. The Arc-ratio rules for GPN are also presented. One can successfully synthesize complicated Petri nets using these rules. An example to synthesize a Petri net in [15] is illustrated. The correctness of each synthesis rule with an appropriate Arc-ratio rule for GPN is proved.

A synthesis technique of general petri nets

Multiple-Weighted Marked Graphs

We have developed a user-friendly CAD graphical tool for the design, verification, simulation, and synthesis of protocols based on an interactive tool for Petri net and state diagram designs. Special features of this tool are: the capability of modeling both control and data flows, reduction and analysis, simulation of network behavior and performance, coding (parametrized protocols and automatic implementation), synthesis (two party protocol and ordinary Petri nets), animation and flexible design. Since it is Petri-net based, it allows simulation during all design phases and has extensive applications such as parallel debugging and simulation, expert systems, etc. Future enhancements of this tool are also discussed.

An interactive tool for design, simulation, verification, and synthesis of protocols

We propose a CAD tool, XPN-FMS, which is primarily based on a unique Petri net (PN) synthesis method, called the knitting technique, developed by the authors. Petri net theory has been applied to specification, validation, performance analysis, control code generation, and simulation for manufacturing systems. The analysis of flexible manufacturing systems (FMSs) based on PNs suffers from the complexity problem of reachability analysis (Peterson, 1981). CAD tools are urgently needed. There is no existing CAD tool for FMSs as comprehensive as XPN-FMS, in the sense that the latter integrates the functions of drawing, analysis, reduction (Chao and Wang, 1992; Murata and Koh, 1980), synthesis, property queries, and animation of FMS operations in one software package. Using the X window graphical interface and animation, XPN-FMS makes the modeling and analysis of an FMS visualizable and easy to understand and manipulate. It lets a user draw the factory layout of an FMS on the screen of a monitor using the supplied tools. A corresponding PN model can also be drawn on the monitor screen. XPN-FMS can animate and simulate the overall operating process of the FMS. It is useful for FMS specification, validation, and exploration of different design alternatives, status monitoring, and control. Using XPN-FMS with various inputs and comparing the resulting outputs, the user can determine how to improve efficiency, reduce cost, and pinpoint bottlenecks. For the PN models of FMSs that are decision free, we extend the theory and algorithm of a unique matrix-based method (Chao and Wang, 1993b) to search for subcritical loops (including types A and B) and to support scheduling and dealing with transition periods. XPN-FMS implements this extended method to find the minimum cycle time, critical loop, subcritical loops, next critical loop, and scheduling ranges to avoid the transient period for static scheduling. This is implemented in XPN-FMS for the input sequence control.

XPN-FMS: A CAD tool for FMS modeling, analysis, animation, and simulation using Petri nets and X window

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