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Plateforme de REcherche Mutualisée pour l’Innovation en Usinage Multiaxes

Dec 8th, 2011

ISA team's seminary, at 14.00 in Salle du Conseil.
Presentation by Yannick Nke, PhD student atInstitute of Automation and Computer Control, Bochum University, Germany : Discrete-event control reconfiguration of a faulty manufacturing process.

Summary:

The goal of fault-tolerant control is to improve the dependability of technological systems by reconfiguring the controller in such a way that the faulty plant fulfills a given specification. This work presents an online reconfiguration procedure that is based on backward and forward recovery strategies for discrete-event systems subject to sensor and actuator faults. Once a fault has been identified, the main idea is to iteratively compute checkpoint states and new control laws in order to eliminate the effects of the fault on the system behavior [2]. Selection criteria have been derived to decide whether a backward or a forward recovery should be applied during the reconfiguration. The approach is model based and makes use of nondeterministic Input/Output automata. The new control scheme published in [1] is used to highlight the components of the controller which are modified to counteract a blocking situation in the control loop. The results of the approach are demonstrated on a "pick & place" system that simulates a typical manufacturing process.

References

[1] Y. Nke and J. Lunze. Control design for nondeterministic input/output automata. In Proceedings of the 18th IFAC Congress, Milan, 2011.
[2] Y. Nke and J. Lunze. Online control reconfiguration for a faulty manufacturing process. In 3rd International Workshop on Dependable Control of Discrete Systems (DCDS), Saarbrücken, Germany, 2011..

Dec 1st, 2011

(only in french) Présentation de Nicolas Guillemot dans le cadre du Séminaire du Lurpa de 10h30 à 11h30 en amphi 109 : Perçage d'empilages aéronautiques