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Conception et pilotage de cellules flexibles à fonctionnement répétitif modélisés par réseaux de Petri

Abstract : The objective of this work is the development of an approach for aiding the shop sizing, the production management and the real time control of flexible manufacturing cells. The approach is about the modelization and the analysis of a flexible cell under a set of cyclic constraints. The selected model is a p-time t-timed Petri net which is more general than an event graph. It allows on the one hand to separate the production routes constraints and the resource allocation constraints, and on the other hand to modelize the operation durations associated with the transitions which are the parameters of our problem and the wait durations of parts in intermediary buffers represented by places which are the unknown of the problem. After determining a cyclic feeding policy, minimal and maximal bounds which correspond to necessary conditions of realisation of a more or less flexible production are computed by the aid of mathematical programming. These bounds are used at the level of a p-time t-timed Petri net token player algorithm including a backtrack mechanism in order to compute a particular strategy of production realisation, the essential objective being to realize a good trade-off between flexibility and efficiency. Finally, starting from a computed previsional schedule, the Petri net model is used for the reactive and real time control of the cell through the utilisation of a real time token player without any backtrack mechanism and allowing to describe in real time the control sequences of operations carried out on the parts, to communicate with the external environment and to meet the explicit temporal constraints. An example of application explains the approach.
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https://tel.archives-ouvertes.fr/tel-00010076
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Submitted on : Thursday, September 8, 2005 - 3:20:04 PM
Last modification on : Friday, January 10, 2020 - 9:08:09 PM
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  • HAL Id : tel-00010076, version 1

Citation

Stéphane Julia. Conception et pilotage de cellules flexibles à fonctionnement répétitif modélisés par réseaux de Petri. Micro et nanotechnologies/Microélectronique. Université Paul Sabatier - Toulouse III, 1997. Français. ⟨tel-00010076⟩

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