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Modélisation et Commande d'un procédé d'Extrusion Réactive

Abstract : The aim of this study is to propose a control strategy for the control of the quality of a polymer at the die of a corotating twin-screw extruder. To achieve this goal, we work out a dynamic model able to predict the behaviour of the system compared with the manipulating variables (speed of the screws, rate feed, powers of heating of the barrel and the ratio of entry monomer-initiator).
Modelling is carried out by adopting a mixed approach combining the mechanical fluids to that of chemical engineering. The intrinsic diagram of flow is approached by a cascade of perfectly stirred tank reactor with backflows. The characteristics of the flow result from the mechanics of the fluids. On the other side, at each reactor, which naturally corresponds to an element of the screw, are associated the concentrations in monomer and initiator, the temperature of the matter, the temperature of the piece of screw and the temperature of the piece of the barrel. Then, the final model consists of a set of differential algebraic equations. This stage of modelling is followed by a phase of analysis with the aim of simplifying the least influential phenomena on the evolution of the variables and by a stage of model reduction.
Finally, in order to synthesize the controller, a linearized model is deduced from the design reduced nonlinear model. For the control, we use Hinf controller design method with model reference on the trajectory in viscosity. This synthesis led to satisfactory controller working at the same time on the linearized model but also on the nonlinear model in the vicinity of the operation range.
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Contributor : Samir Eddine Choulak <>
Submitted on : Monday, November 27, 2006 - 1:51:17 PM
Last modification on : Friday, June 25, 2021 - 7:14:02 PM
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  • HAL Id : tel-00116677, version 1



Samir Eddine Choulak. Modélisation et Commande d'un procédé d'Extrusion Réactive. Automatique / Robotique. Université Claude Bernard - Lyon I, 2004. Français. ⟨tel-00116677⟩



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