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We introduce a new methodology for the specification and the design of the control logic of automated manufacturing systems. Our aim is to make specification express just what is necessary earlier in the design process. This permits to produce an optimized work cycle for the system and makes both production recovery calculation and code generation easier. The methodology is based on a modular modeling...
The use of Petri nets for the modelling of discrete-event systems is well-studied. Yet, the tools allowing the implementation of these models, and supporting code generation, are still very few, almost non-existent. This paper starts by presenting a Petri net class, based on place/transition nets and well-known concepts from synchronised and interpreted Petri nets. This Petri net class allows the...
This paper introduces an adaptive feedback control strategy for (max,+)-linear systems. The feedback loop is tuned following to an estimation of the system transfer and in order to match a given reference model. An application of such an adaptive control strategy is possible for some manufacturing systems in which the feedback control corresponds to an adaptive resource allocation
A mega-controller architecture is introduced for reconfiguration of discrete event system controllers with dynamic observation sets. The mega-controller uses several reconfiguration strategies to revise the control policies based on the availability of the observation means. It is known that the mega-controller could have multiple choices of reconfiguration strategies in a given state and therefore...
The class of discrete event systems (DES) which involve only synchronization phenomena can be represented by linear state equations in particular algebraic structures. The (max,+) algebra is a dioid over which, these systems can have a linear state representation with special sum and product operations. The study of the DES over this (max,+) algebra is usually made through the corresponding timed...
This paper explains the modelling of distributed discrete-event systems in one single simulation model. Our purpose was to evaluate the design of the distributed system and to highlight the communications required between the sub systems. This forms a contrast to the distributed simulation where the system is taken as a whole and the simulation tool makes transparent the communications between the...
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