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Design optimization of the Petri net-based production process supported by additive manufacturing technologies

Patalas-Maliszewska Justyna, Wiśniewski Remigiusz, Topczak Marcin, Wojnakowski Marcin

Bulletin of the Polish Academy of Sciences. Technical Sciences

2022

Vol. 70, nr 2

art. no. e140693

In the era of smart manufacturing and Industry 4.0, the rapid development of modelling in production processes results in the implementation of new techniques, such as additive manufacturing (AM) technologies. However, large investments in the devices in the field of AM technologies require prior analysis to identify the possibilities of improving the production process flow. This paper proposes a new approach to determine and optimize the production process flow with improvements made by the AM technologies through the application of the Petri net theory. The existing production process is specified by a Petri net model and optimized by AM technology. The modified version of the system is verified and validated by the set of analytic methods safeguarding against the formal errors, deadlocks, or unreachable states. The proposed idea is illustrated by an example of a real-life production process.

Analysis of safeness in a Petri net-based specification of the control part of cyber-physical systems

Wojnakowski Marcin, Wiśniewski Remigiusz, Bazydło Grzegorz, Popławski Mateusz

International Journal of Applied Mathematics and Computer Science

2021

Vol. 31, no. 4

647--657

The paper proposes an algorithm for safeness verification of a Petri net-based specification of the control part of cyber-physical systems. The method involves a linear algebra technique and is based on the computation of the state machine cover of a Petri net. Contrary to the well-known methods, the presented idea does not require obtaining all sequential components, nor the computation of all reachable states in the system. The efficiency and effectiveness of the proposed method have been verified experimentally with a set of 243 test modules (Petri net-based systems). The results of experiments show high efficiency of the proposed method since a solution has been found even for such nets where popular techniques are not able to analyze the safeness of the system. Finally, the presented algorithm is explained in detail using a real-life case-study example of the control part of a cyber-physical system.