Modular hybrid Petri nets for studying multi-operational production systems where parts follow multiple alternative processes

Abstract- This paper presents a Modular Hybrid Timed Petri Net (MHTPN) methodology used to study multi-operational production systems in which parts are used for the production of different product types. This research generalizes work presented in [1] that studied production systems where all parts of the same type were used for the production of a type of final products following a common route. 3 fundamental system modules are derived; their MHTPN models are defined, followed by modules synthesis to obtain the overall system Petri net. For any topology, system’s nodes and invariants are calculated. Applicability of the method is illustrated through an analytical example. Index Terms- Multi-operational production systems, hybrid systems, modular timed hybrid PNs, complexity analysis

Petri Net Modeling of Routing and Operation Flexibility in Production Systems MoM04-4

Abstract — Timed Petri nets are used to model operational and routing flexibility in production systems. A generalized multi-productive machine module is defined, adapted to system features, repeated and connected to compose the TPN models of production systems with different levels of routing and operation flexibility. The models obtained are used to study system parameters under different conditions. Applicability of the method is illustrated through an analytical example. I

Petri net modeling of routing and operation flexibility in production systems

Summarization: Timed Petri nets are used to model operational and routing flexibility in production systems. A generalized multi-productive machine module is defined, adapted to system features, repeated and connected to compose the TPN models of production systems with different levels of routing and operation flexibility. The models obtained are used to study system parameters under different conditions. Applicability of the method is illustrated through an analytical example.Παρουσιάστηκε στο: 13th Mediterranean Conference on Control and Automatio

Modeling, analysis, synthesis, and performance evaluation of multioperational production systems with hybrid timed Petri nets

Summarization: Hybrid timed Petri nets (HTPNs) are derived to study random topology and complexity multioperational production systems where parts of one type follow the same route to produce a final product. Each production system is first decomposed into a fundamental multiproductive machine, multiassembly and multidisassembly modules, followed by derivation of their corresponding HTPN models. The overall system HTPN model is obtained via individual module synthesis, satisfying system constraints. Individual module and overall HTPN models nodes (places and transitions) are calculated. Individual module and overall system model invariants are derived mathematically. Performance and possible tradeoffs due to varying operational constraints (buffer capacity, work in process, machine utilization, backlog, etc.) are investigated through extensive simulations. Results show the applicability of the proposed methodology and justify its modeling power and generality.Presented on: IEEE Transactions on Automation Science and Engineerin