Commande d'un véhicule hypersonique à propulsion aérobie : modélisation et synthèse

Abstract : High speed airbreathing thrust has been known for a long time as one of the next technological step to be overcome in space launchers domain. However, HyperSonic Vehicles (HSV) speed operating ranges being extremely high, numerous constraints and uncertainties restrict the ensuring of control properties. The purpose of this thesis is to study control synthesis for such a vehicle.First, it concern the definition of a HSV model for controlling purpose. In this work is constructed two HSV models. One in order to effect closed loop simulation, and the other in order to precisely establish the control problem.Then, is proposed a control synthesis for the longitudinal dynamics restricted to the symmetric vertical plane. It is robust to modelling uncertainties, allows saturation, and does not excite neglected fast dynamics. Its properties are evaluated on different cases of simulation. Next, an extension is proposed in order to solve the problem of controlling simultaneously longitudinal and lateral dynamics, under the same constraints.This result is obtained by the use of control Lyapunov functions, following the study of longitudinal and lateral dynamics. Furthermore, in order to solve tracking errors due to modelling uncertainties, the problem of robust asymptotic regulation by state feedback has been addressed. It is shown that such a regulation can be achieved by stabilizing the system augmented by an output integrator. This constitutes an extension for nonlinear systems of the proportional-integral control structure.
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François Poulain. Commande d'un véhicule hypersonique à propulsion aérobie : modélisation et synthèse. Autre. Ecole Nationale Supérieure des Mines de Paris, 2012. Français. ⟨NNT : 2012ENMP0014⟩. ⟨pastel-00744985⟩

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