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HERNANDEZ Esteban

Boundary controllability, stabilization and tracking problems for parabolic systems

 

Directeur de thèse :     Christophe PRIEUR

École doctorale : Electronique, electrotechnique, automatique, traitement du signal (EEATS)

Spécialité : Automatique et productique

Structure de rattachement : Autre

Établissement d'origine : Universidad de chile - Chili

Financement(s) : bourse attribuée par un gouvernement étranger

 

Date d'entrée en thèse : 01/03/2017

Date de soutenance : 31/08/2021

 

Composition du jury :
MERCADO Alberto, Professeur Associé, Universidad Técnica Federico Santa Maria, Président du jury.
BAUDOUIN Lucie, Chargée de recherche, CNRS, Laboratoire d'Analyse et d'Architecture de Systèmes, Examinatrice.
TUCSNAK Marius, Professeur, Université de Bordeaux, Examinateur.
BOYER Franck, Professeur, Université Toulouse III- Paul Sabatier, Rapporteur.
MEURER Thomas, Professeur, Christian-Albrechts-Universität zu Kiel, Rapporteur
PRIEUR Christophe, Directeur de Recherche, CNRS, Université Grenoble Alpes, Directeur de thèse
CERPA Eduardo, Professeur Associé, Pontificia Universidad Católica de Chile, co-Directeur de thèse

 

Résumé : Mathematical modeling has a key role in the description of a large part of phenomena in applied science, technological and industrial applications. A mathematical model is a set of mathematical relations, usually equations, able to describe the essential features of a natural or artificial system, with the purpose to describe, forecast and control its evolution. The goal of this thesis is to study some control problems in mathematical models governed by partial differential equations of parabolic type. In Chapter one we introduce in a general way the problems that have been studied and the main results obtained. In Chapter two the Single Particle Model is used to describe the behavior of a Li- ion battery. The main goal is to design a feedback input current in order to regulate the State of Charge (SOC) to a prescribed reference trajectory. In order to do that, we use the boundary ion concentration as output. First, we measure it directly and then we assume the existence of an appropriate estimator, which has been established in the literature using voltage measurements. By applying the backstepping method and Lyapunov tools, we are able to build observers and to design output feedback controllers giving a positive answer to the SOC tracking problem. We provide convergence proofs and perform some numerical simulations to illustrate our theoretical results. The Chapter three is devoted to study the boundary controllability property of some parabolic-elliptic systems. More precisely, along this chapter, we prove the null controllability property for two one dimensional parabolic-elliptic systems. Both of them are under the action of one scalar control at the boundary. In the first case, we study the null controllability for a system with a non-linear term in the parabolic part with a control placed at the boundary of the parabolic equation. In a second case, we study a linear system with the control placed at the boundary of the elliptic part. The arguments, in the first case, rely on the controllability-observability duality principle and a suitable Carleman estimate for the solution of the adjoint equation of the linearized system. Then, by means of a local inverse theorem we prove the result for the original system. For the second case, we use the moment method and the spectral analysis of the underlying spatial operator associated with such system. In Chapter four, we address the problem of rapid stabilization of an one dimensional unstable heat equation under the action of an unknown boundary disturbance. Combining the backstepping method and the multivalued operator sign(·), we design a boundary feedback law which exponentially stabilizes the system, in the L2 norm. Moreover, the rate can be fixed arbitrarily large. The existence of solutions to the closed-loop system is obtained by using the theory of maximal monotone operators and numerical simulations are performed in order to illustrate our results. Finally, in Chapter five, we collect some conclusion and remarks on every problem studied in the previous chapters. Besides, we discuss some remaining open questions and future line research, for every one of those problems. Keywords: Control systems, Partial Differential Equations, Output Tracking, Backstepping Method, Controllability, Carleman estimate, Maximal Monotone Operators.


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