A modular modeling approach for automated manufacturing systems based on shared resources and process planning using Petri nets

2002 ◽  
Author(s):  
O. Morandin ◽  
E.R.R. Kato ◽  
P.R. Politano ◽  
H.A. Camargo ◽  
A.J.V. Porto ◽  
...  
Keyword(s):  
Petri Nets ◽  
Process Planning ◽  
Manufacturing Systems ◽  
Automated Manufacturing ◽  
Shared Resources ◽  
Automated Manufacturing Systems ◽  
Modular Modeling ◽  
Modeling Approach

scholarly journals Comparison and Evaluation of Deadlock Prevention Methods for Different Size Automated Manufacturing Systems

2015 ◽  
Vol 2015 ◽  
pp. 1-19 ◽  
Author(s):  
Emad Abouel Nasr ◽  
Abdulaziz M. El-Tamimi ◽  
Abdulrahman Al-Ahmari ◽  
Husam Kaid
Keyword(s):  
Petri Nets ◽  
Iterative Methods ◽  
Petri Net ◽  
Manufacturing Systems ◽  
Deadlock Prevention ◽  
Automated Manufacturing ◽  
Shared Resources ◽  
Automated Manufacturing Systems ◽  
High Resource ◽  
Model And Simulation

In automated manufacturing systems (AMSs), deadlocks problems can arise due to limited shared resources. Petri nets are an effective tool to prevent deadlocks in AMSs. In this paper, a simulation based on existing deadlock prevention policies and different Petri net models are considered to explore whether a permissive liveness-enforcing Petri net supervisor can provide better time performance. The work of simulation is implemented as follows. (1) Assign the time to the controlled Petri net models, which leads to timed Petri nets. (2) Build the Petri net model using MATLAB software. (3) Run and simulate the model, and simulation results are analyzed to determine which existing policies are suitable for different systems. Siphons and iterative methods are used for deadlocks prevention. Finally, the computational results show that the selected deadlock policies may not imply high resource utilization and plant productivity, which have been shown theoretically in previous publications. However, for all selected AMSs, the iterative methods always lead to structurally and computationally complex liveness-enforcing net supervisors compared to the siphons methods. Moreover, they can provide better behavioral permissiveness than siphons methods for small systems. For large systems, a strict minimal siphon method leads to better behavioral permissiveness than the other methods.

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