Dissertations / Theses on the topic 'Systèmes linéaires et non linéaires fractionnaires'
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N'Doye, Ibrahima. "Généralisation du lemme de Gronwall-Bellman pour la stabilisation des systèmes fractionnaires." Electronic Thesis or Diss., Nancy 1, 2011. http://www.theses.fr/2011NAN10007.
Full textIn this dissertation, we proposed sufficient conditions for the asymptotical stabilization of a class of nonlinear fractional-order systems based on the generalization of Gronwall-Bellman lemma. We extended these results for the asymptotical stabilization of nonlinear singular fractional-order systems and proposed sufficient conditions for the existence and asymptotic stability of the observation error for the nonlinear fractional-order systems and nonlinear singular fractional-order systems.For the nonlinear integer-order systems, the proposed generalization of Gronwall-Bellman lemma allowed us to obtain sufficient conditions for :- the static state feedback and the static output feedback exponential stabilizations,- the robust exponential stabilization with regards to parameter uncertainties,- the observer-based control.We treated three cases for the asymptotical stabilization of linear fractional-order systems : the static state feedback, the static output feedback and the observer-based output feedback. Then, we proposed sufficient conditions for the asymptotical stabilization of linear fractional-order systems with nonlinear uncertain parameters. Finally, we treated the observer design for the linear and nonlinear fractional-order systems and for the linear and nonlinear singular fractional-order systems.The stabilization technique based on the generalization of Gronwall-Bellman lemma is extended to nonlinear fractional-order systems and nonlinear singular fractional-order systems. Sufficient conditions for the asymptotical stabilization, the robust asymptotical stabilization and the observer-based control of a class of nonlinear fractional-order systems and nonlinear singular fractional-order systems were obtained.Furthermore, the observer design for the nonlinear fractional-order systems and nonlinear singular fractional-order systems is proposed. This approach is based on a parameterization of the solutions of generalized Sylvester equations. The conditions for the existence of these observers are given and sufficient conditions for their stability are derived using linear matrix inequalities (LMIs) formulation and the generalization of Gronwall-Bellman lemma. The advantage of this method is that, firstly, the observation error does not depend explicitly on the state and control system and, secondly, this method unifies the design of full, reduced and minimal orders observers
N'Doye, Ibrahima. "Généralisation du lemme de Gronwall-Bellman pour la stabilisation des systèmes fractionnaires." Phd thesis, Université Henri Poincaré - Nancy I, 2011. http://tel.archives-ouvertes.fr/tel-00584402.
Full textGuelmame, Billel. "Sur une régularisation hamiltonienne et la régularité des solutions entropiques de certaines équations hyperboliques non linéaires." Thesis, Université Côte d'Azur, 2020. https://tel.archives-ouvertes.fr/tel-03177654.
Full textIn this thesis, we study some non-dispersive conservative regularisations for the scalar conservation laws and also for the barotropic Euler system. Those regularisations are obtained inspired by a regularised Saint-Venant system introduced by Clamond and Dutykh in 2017. We also study the regularity, in generalised BV spaces, of the entropy solutions of some nonlinear hyperbolic equations. In the first part, we obtain and study a suitable regularisation of the inviscid Burgers equation, as well as its generalisation to scalar conservation laws. We prove that this regularisation is locally well-posedness for smooth solutions. We also prove the global existence of solutions that satisfy a one-sided Oleinik inequality for uniformly convex fluxes. When the regularising parameter ``l’’ goes to zero, we prove that the solutions converge, up to a subsequence, to the solutions of the original scalar conservation law, at least for a short time. We also generalise the regularised Saint-Venant equations to obtain a regularisation of the barotropic Euler system, and the Saint-Venant system with uneven bottom. We prove that both systems are locally well-posed in Hs, with s ≥ 2. In the second part, we prove a regularising effect, on the initial data, of scalar conservation laws with Lipschitz strictly convex flux, and of scalar equations with a linear source term. For some cases, we give a limit of the regularising effect.Finally, we prove the global existence of entropy solutions of a class of triangular systems involving a transport equation in BV^s x L^∞ where s > 1/3
Boukal, Yassine. "Observation et commande des systèmes dynamiques d’ordre non entier." Electronic Thesis or Diss., Université de Lorraine, 2017. http://www.theses.fr/2017LORR0154.
Full textThis work focuses on the synthesis of observers and the controller laws for fractional order systems. The presented document consists of 4 chapters: The first chapter of the theses manuscript contains an introduction dealing with the basic mathematical notions and the stability analysis of fractional systems as well as a presentation of the different definitions. The stability conditions of these systems and some examples of systems modeled by fractional differential equations are presented. In the second chapter, we were interested in the design of several types of observers of reduced order, full order, and functional observers for fractional systems with and without delays. In the case where there are no delays in the dynamics of the system, observers of full and reduced orders have been synthesized in order to ensure the estimation of the pseudo-states. In a second step, a functional observer was synthesized in the case where the delay is present in the dynamics of the system. In Chapter 3, we worked on observer synthesis for uncertain fractional order systems. Our contributions are classified into three main lines: first, when the system under consideration is affected by unknown inputs, a functional observer has been proposed. In the second part, H∞ observers for fractional order systems with and without delays have been synthesized to ensure the stability of the estimation error. It is a question of guaranteeing a bound of the L2 gain between the observation error and the non-measurable perturbations affecting the dynamics of the system: this gain L2 is also called H∞ norm. In last part of this chapter, the synthesis of a robust observer with respect to modeling uncertainties for this class of systems is presented. The sufficient conditions of convergence of the estimation errors of the pseudo-states obtained are established in the form of a set of matrix inequalities LMIs. The last chapter of the manuscript is devoted to the command based on the different observers obtained. We were interested in observer-based control for fractional order systems. This command is based on the observers proposed in the previous chapters. Stability conditions and synthesis procedures are presented
Narayaninsamy, Tony. "Contribution à l'étude de l'itérisation fractionnaire et à celle des endomorphismes bi-dimensionnels." Toulouse 3, 1992. http://www.theses.fr/1992TOU30271.
Full textRammal, Rim. "Caractérisation des sorties plates pour le diagnostic de systèmes entiers ou non entiers : application pour le diagnostic d’un système hydraulique et d’un système thermique." Thesis, Bordeaux, 2021. http://www.theses.fr/2021BORD0021.
Full textThe differential flatness is a property of dynamic systems that allows the transformation of a very complex system into a simpler one called flat system. Roughly speaking, a dynamic system is said to be flat if, and only if, there exists a vector, called flat output vector and formed by the state and input variables, such that all the system states, inputs and outputs can be expressed in function of this new vector and its successive time derivatives. The differential flatness property has many applications in automatic control theory, such as trajectory planning, trajectory tracking and the designing of robust controllers. Moreover, the flatness property has recently entered the field of fault detection and isolation. In short, fault detection and isolation is a sub-domain of automatic control engineering that deals with monitoring a system, identifying when a fault has occurred, and determining the type of fault and its location. Fault detection is performed by analyzing the difference between sensor and actuator measurements and their expected values, derived from any model and called redundant values. It is common to say that an error is detected if the deviation or residue exceeds a certain predefined threshold. Fault isolation, in turn, must make it possible to locate the fault in the machine. The most recent method of fault detection and isolation, based on the flatness property, calculates redundant variables from the measurement of the flat output of the system and its successive time derivatives. Then, the residues are deduced from the difference between the measured variables and the redundant variables. Fault detection by this method is guaranteed. However, the use of a single flat output does not allow, in some cases, to isolate some faults. The idea proposed by the developers of the method was to use several flat outputs to increase the number of the residual signals, which would increase the chances of isolating more faults. However, it was also noticed that the choice of these flat outputs is not arbitrary. That is, there are flat outputs that, when used together, increase the isolability of faults and others that do not. One of the objectives of this manuscript is to characterize the flat outputs in order to obtain a better fault isolability. This characterization is then verified by simulations and experiments on a hydraulic system, the three-tank system.Over the last decade, numerous studies have shown that there are systems such as thermal systems, viscoelastic systems and chemical systems that can be modeled by fractional differential equations. Therefore, classical methods of fault detection and isolation, originally developed to deal with integer order systems, were not suitable for fractional order systems, and fault detection and isolation methods specific to fractional order systems had to be developed. A second objective of this manuscript is to extend the characterization of flat outputs, proposed for the class of integer order flat systems to the class of fractional order linear flat systems, and then to apply this characterization to the detection and isolation of faults that may appear on the sensors and actuators of these systems. The effectiveness of this characterization is also verified by simulations on a bi-dimensional thermal system
Nasser, Eddine Achraf. "Modélisation fractionnaire et identification d'impédance d'accumulateurs électrochimiques." Thesis, Poitiers, 2019. http://www.theses.fr/2019POIT2307.
Full textThe impedance of an electrochemical accumulator is mainly characterized by three phenomena: the electronic conduction, the charge transfer and the ionic diffusion. The modeling of these phenomena involves non-rational transfer functions that cannot be directly simulated in the time domain. Then, their approximation by fractional models (also known as non-integer order models) becomes relevant to estimate the impedance characteristics from not only frequency measurements (spectroscopy), but also time measurements (chronopotentiometry). Moreover, the long-time required by the spectroscopy to measure at low frequencies, as well as the complexity of the equipment used can be avoided by using chronopotentiometry. Models identification strategies have been developed and validated experimentally on a Ferri ferrocyanide electrochemical cell, on Lithium-ion and on Nickel Metal-Hydride accumulators. The characterization tests of these elements are carried out at different states of charge and obtained results show the interest and the relevance of the methodology
Hu, Wei. "Identification de paramètre basée sur l'optimisation de l'intelligence artificielle et le contrôle de suivi distribué des systèmes multi-agents d'ordre fractionnaire." Thesis, Ecole centrale de Lille, 2019. http://www.theses.fr/2019ECLI0008/document.
Full textThis thesis deals with the parameter identification from the viewpoint of optimization and distributed tracking control of fractional-order multi-agent systems (FOMASs) considering time delays, external disturbances, inherent nonlinearity, parameters uncertainties, and heterogeneity under fixed undirected/directed communication topology. Several efficient controllers are designed to achieve the distributed tracking control of FOMASs successfully under different conditions. Several kinds of artificial intelligence optimization algorithms andtheir modified versions are applied to identify the unknown parameters of the FOMASs with high accuracy, fast convergence and strong robustness. It should be noted that this thesis provides a promising link between the artificial intelligence technique and distributed control
Schreier, Gerhard. "Estimation de l'état de systèmes linéaires incertains et de systèmes non linéaires." Vandoeuvre-les-Nancy, INPL, 1997. http://www.theses.fr/1997INPL101N.
Full textBecis-Aubry, Yasmina. "Contribution à l'estimation ensembliste des systèmes linéaires et non-linéaires." Nancy 1, 2003. http://www.theses.fr/2003NAN10190.
Full textThe aim of this thesis is the design of ellipsoidal approximation techniques for the set-membership identification and state estimation of linear and nonlinear multivariable systems. Firstly, a recursive solution for the identification of linear models has been proposed. The use of a judicious parametrization allows to characterize the ellipsoid that bounds the set of all the possible values of the unknown parameters and to ensure consistency of the estimated parameters with the data and respecting the boundedness constraints. A generalization to the nonlinear case has been done by linearizing the nonlinear model around the vector of the estimated parameters and by taking into account the linearization errors. Next, a state estimation method for linear and nonlinear systems with bounded noises is presented. A prediction step takes into account the dynamical behavior of the model corrupted by the noises while the correction step includes the information contained in the noisy outputs
Ziane, Khodja Lilia. "Résolution de systèmes linéaires et non linéaires creux sur grappes de GPUs." Phd thesis, Université de Franche-Comté, 2013. http://tel.archives-ouvertes.fr/tel-00947627.
Full textBarillon, Franck. "Méthodologies de couplage fort des systèmes dynamiques : approches linéaires et non-linéaires." Thesis, Ecully, Ecole centrale de Lyon, 2011. http://www.theses.fr/2011ECDL0012/document.
Full textIn this thesis we studied the vibratory behaviour of a whole vehicle under engine excitation at low frequencies (0 – 50 Hz) and medium frequencies (200 – 800 Hz). The aim of the thesis was to provide numerical methodologies to take into account coupling effects between all the sub-systems constituting a whole car. In low frequencies, we used a global approach where each subsystem was characterized separately before coupling. First the car body was characterised both experimentally and numerically using a modal appropriation method that is commonly used in the aeronautic field. Numerical shapes of the modes were correlated to experimental shapes. In addition, the amplitude and frequency non linear behaviour of the engine mounts was measured on a test bench. A strong non linear behaviour was observed and stiffness – frequency – amplitude layers were constructed based on those data.Secondly, numerical methods were developed in order to calculate the coupled non linear response between the engine, the engine mounts and the car body. We used a harmonic balance method that allows calculating the non linear dynamics of complex mechanical systems. In order to apply this method to large industrial finite element models, a condensation method on non linear degrees of freedom was developed. This technique is well adapted to problems of linear structures linked together with localnon linear joints. This method was validated on the isolated engine linked to a bench by the engine mounts. Strong non linear phenomena on the rigid body modes of the engine were observed experimentally.A numerical model of the engine was developed and the HBM method allowed reproducing these non linear phenomena. Eventually, the non linear model of the whole vehicle was coupled and excited by different efforts. First we calculated the response of the assembly using the appropriation method. Then, the structure was excited by a real four – cylinder engine excitation.In medium frequencies, we presented an important study for the group Renault concerning the stiffness measurement of the engine mounts. A numerical methodology based on the FRF Based Substructuring(FBS) method was developed. This method was applied to uncouple an engine mount initially coupled to a test bench. The numerical feasibility of the method was proved and allowed to get the own vibratory behaviour of the engine mount despite coupling phenomena with the test bench
Mouyon, Philippe. "Pseudolinéarisation et pseudocompensation des systèmes non linéaires." Toulouse, ENSAE, 1986. http://www.theses.fr/1986ESAE0015.
Full textOlech, Michał. "Systèmes d'évolution non linéaires et leurs applications." Paris 11, 2007. http://www.theses.fr/2007PA112250.
Full textThe first part is devoted to the analysis of two mean-field problems describing particles which interact with themselves either by electrical or gravitational forces. We first investigate steady state solutions for a problem with gravitational forces. We use methods of ordinary differential equations as well as variational methods to obtain the uniqueness and existence of many stationary solutions. Using methods of functional analysis, ordinary differential equations and fixed point theorems, we then prove the existence of global in time solutions of a system of partial differential equations describing the time evolution of a cloud of electrically charged particles. Moreover, we describe the large time behavior of solutions as t tends to infinity. We are especially interested in the two-dimensional case, when the system is considered in the whole space R^2. We show that in the case of small initial conditions the large time behavior of the solutions much differs from that in the higher-dimensional case. The second part involves a nonlinear parabolic reaction-diffusion system which both includes a linear model for intercellular transport in eukarya, and a reversible chemical reaction. We prove a contraction property in L^1 for the semigroup associated with the system. Then, using a Lyapunov functional, we show the convergence of the solutions to suitable steady states as t tends to infinity. In the linear case we prove the existence and uniqueness of stationary solutions in space dimensions 1, 2, 3 and 4. In the last chapter we investigate a numerical finite volume scheme for the nonlinear system modeling fast reversible chemical reactions. For the convergence proof we search for discrete versions of standard a priori estimates, comparison principles and compactness theorems. Moreover, we perform numerical experiments for the concrete example of a real chemical reaction
Héleschewitz, David. "Analyse et simulation de systèmes différentiels fractionnaires et pseudo-différentiels linéaires sous représentation diffusive." Paris, ENST, 2000. http://www.theses.fr/2000ENST0033.
Full textTheilliol, Didier. "Identification de systèmes siso linéaires et non linéaires par réseaux de neurones multicouches." Nancy 1, 1993. http://www.theses.fr/1993NAN10261.
Full textRozanova-Pierrat, Anna. "Equation de Khokhlov-Zabolotskaya-Kuznetsov. Analyse Mathématique, Validation de l'approximation et Méthode de Contrôle." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2006. http://tel.archives-ouvertes.fr/tel-00126487.
Full textJouan, Philippe. "Singularités des systèmes non linéaires. Observabilité et observateurs." Rouen, 1995. http://www.theses.fr/1995ROUES032.
Full textTatuam, Kamga Christophe. "Transmissivité et instabilité de systèmes non linéaires finis." Dijon, 1993. http://www.theses.fr/1993DIJOS050.
Full textZerrougui, Mohamed. "Observation et commande des systèmes singuliers non linéaires." Phd thesis, Université Henri Poincaré - Nancy I, 2011. http://tel.archives-ouvertes.fr/tel-00705339.
Full textZerrougui, Mohamed. "Observation et commande des systèmes singuliers non linéaires." Electronic Thesis or Diss., Nancy 1, 2011. http://www.theses.fr/2011NAN10143.
Full textThis thesis work is realized in the Research Center in Automatic Control of Nancy (CRAN). It concerns the observation and control of nonlinear singular systems. Firstly, we were interested in the observer design and H infinity filtering for singular bilinear systems. In a second step, we studied the observers design for Lipschitz nonlinear singular systems. The last part of this work relates to the stabilization and observer based controller for a classe of singular nonlinear systems. The objective is to develop a simple and straightforward results which covers a large class of nonlinear systems. The main contribution of this thesis is in the H infinity observers design for nonlinear singular systems. It is based on the parametrization of the solution of the constrained generalized Sylvester equation. The second contribution relates to the design of stabilizing control and using the proposed observer to design an obsever based controller for nonlinear singular systems. Solutions of these problems are obtained by using Linear Matrix Inequalities (LMI) Formulation
Altares, Menendez Valentin. "Systèmes dynamiques non linéaires dans un environnement stochastique." Doctoral thesis, Universite Libre de Bruxelles, 1989. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/213259.
Full textZerkaoui, Salem. "Commande neuronale adaptative des systèmes non linéaires." Le Havre, 2007. http://www.theses.fr/2007LEHA0010.
Full textThe main contribution of this work is to propose a robust stable self-adaptive InDirect neural Network Control "IDNC" to control a broad variety of unknown linear, nonlinear, SISO and MIMO systems. The control scheme is made of an adaptive instantaneous neural model, a neural controller and an on-line parameter updating law. The IDNC parameters start at zero initial conditions which ensure that the performances do not depend on the initialization phase. Closed loop performances as well as sufficient conditions for asymptotic stability and robustness are derived from the Lyapunov approach. The simulations and experimental tests are carried out in order to validate the performances of the proposed approach. In particular, our contribution is used for the control of the Tennessee Eastman Challenge Process and a medical robot. Also, the proposed structure can easily be implemented in several practical applications
Garcia, Iturricha Aitor. "Analyse et commande CRONE de systèmes linéaires non stationnaires." Bordeaux 1, 2001. http://www.theses.fr/2001BOR12393.
Full textThis work deals with the extension of CRONE Control (robust control method based on fractional calculus) to the control fo time-varying systems such as time-varying systems with periodic coefficients and time-varying systems with asymptotically constant coefficients. These extensions, carried out both in the continuous and in the discret-time domain, have been feasible thanks to the representations of the considered systems using time-varying p-transfer functions (for continuous-time systems) and z-transfer functions (for discrete-time systems). These representations have also allowed to extend several well-known theorems such as initial and final value theorems to time-varying systems and have also allowed several extensions of Nyquist theorem. Each theorem and each extension fo CRONE control carried out in this work has been validated through their application to control of a testing bench with two DC motors
Khomenko, Viacheslav. "Modélisation et compensation des déficiences linéaires et non linéaires dans les transmissions électromécaniques des robots humanoïdes." Versailles-St Quentin en Yvelines, 2013. http://www.theses.fr/2013VERS0069.
Full textWalking robots need precise control for legs articulations because it influences their equilibrium. It is necessary to compensate vibrational effects caused by defects in articulations (elasticities, mechanical backlashes, frictions and structural deformations). Our approach consists of correcting inputs of the robot control system in a robust way according to variations of functional conditions and robot parameters. We use adaptive and learning control methods, neuronal networks and nonlinear oscillators. As it is necessary to know exact torques of the robot, we take into account nonlinearities of mechanical transmissions and motors. The presented non-direct articulation accelerations measurement method permits to obtain accurate feedback. Experimental validation of compensation and control methods is done for the ROBIAN bipedal robot for flexion-extension movements
Guenoune, Ibrahim. "Commandes non linéaires robustes de systèmes éoliens." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0003/document.
Full textThis work deals the nonlinear control of wind turbine structures. The first objective is the design of control laws of a standard wind turbine with variable speed-variable pitch angle. The proposed control strategies allow controlling the wind turbine indifferent operating areas (optimization and powerlimitation).The second objective consists in controlling a new structure of twin wind turbines. The originality of this structure lies in the fact that it can rotate face the wind without using a dedicated actuator, thanks to the free rotation of the arm carrying the wind turbines. Two control architectures are proposed in order to ensure the structure face the wind : pitch angles differential and the produced power difference. Given that the environment is uncertain (windvariations, modeling errors, noise), robust nonlinear control laws are proposed for a multiple objectives. The efficiency of the control strategies have been carried out according to several scenarios
Motchon, Koffi Mawussé Djidula. "Caractérisation de la discernabilité des systèmes dynamiques linéaires et non-linéaires affines en la commande." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10027/document.
Full textThe distinguishability of the input-output behavior of two dynamical systems plays a crucialrole in many applications such as control and observation of hybrid dynamical systems. Thisthesis aims to characterize this property of distinguishability. For linear systems and nonlinearcontrol-affine systems, we establish: conditions for strict distinguishability that ensure thedistinguishability of the systems for every control input jointly applied to them; conditions forcontrolled-distinguishability that guarantee the existence of a control input which makes distinguishable the outputs of the systems; conditions for residual-distinguishability that characterize the distinguishability of the modes through parity-space residuals. Moreover, in the linear case, a metric is specified in order to quantify for a given control input, the distinguishability degreeof the systems and the robustness of the property of distinguishability
Marquez-Martinez, Luis Alejandro. "Analyse et commande de systèmes non linéaires à retards." Phd thesis, Université de Nantes, 2000. http://tel.archives-ouvertes.fr/tel-00269005.
Full textOn recherche des solutions causales pour divers problèmes de la commande, pouvant être mises en oeuvre sans faire appel aux prédicteurs d'état.
Pour ce faire, une nouvelle approche mathematique adaptée à cette classe de systèmes à été introduite. Elle est établie de façon naturelle à partir des connaissances standard sur les systèmes non linéaires sans retard et sur les systèmes linéaires à retards.
Cette nouvelle approche est, en fait, une contribution majeure de ce travail de thèse. Elle nous a permis d'étudier quelques propriétés des systèmes non linéaires à retards, telles que l'accessibilité ou l'inversion, mais aussi de proposer des conditions vérifiables et constructives sous lesquelles il existe des solutions causales à plusieurs problèmes de la commande, tels que le rejet de perturbation, la linéarisation entrée-sortie et la poursuite de trajectoire.
Bouchel, Olivier. "Quelques équations et systèmes d'équations de Schrödinger non linéaires." Paris 11, 2006. http://www.theses.fr/2006PA112243.
Full textThis PhD thesis is devoted to a few nonlinear Schrödinger equations and systems. The nonlinear Schrödinger equation is one of themost important models in the description of phenomena in nonlinear optics, in superfluidity or in supra-conductivity. Deriving fromphysics equations one more accurate form of the nonlinear Schrödinger equation, we get one additional fourth order anisotropic dispersion term in the time variable : in the first and in the fifth sections, we study for this equation the Cauchy problems in suitable spaces, the existence and qualitative properties of its solitary waves, stability and blowup issues, theoretically as well as numerically. In the third section, considering the example of one system of coupled nonlinear Schrödinger equations arising in nonlinear optics, we investigate the existence of solitary waves and their symmetry properties. In the second and fourth sections, non zero boundary conditions in some nonlinear Schrödinger equations are required : this issue,which appears naturally in the Bose Einstein condensation theory, is illustrated with the study of the asymptotic behaviour of oneGross-Pitaevskii-Schrödinger system, and of the existence of nonstationary bubbles in dimensions two and three
Courtial, Estelle. "Commande prédictive et estimation d'état de systèmes non linéaires." Lyon 1, 1996. http://www.theses.fr/1996LYO10093.
Full textBen, Amor Selwa. "Observation et commande de systèmes non linéaires temps-discret." Lyon 1, 1997. http://www.theses.fr/1997LYO10124.
Full textKazakos, Démosthène. "Sur l'observabilité et les observateurs de systèmes non-linéaires." Grenoble INPG, 1987. http://www.theses.fr/1987INPG0006.
Full textHassan, Lama. "Observation et commande des systèmes non linéaires à retard." Phd thesis, Université de Lorraine, 2013. http://tel.archives-ouvertes.fr/tel-00934943.
Full textHassan, Lama. "Observation et commande des systèmes non-linéaires à retard." Electronic Thesis or Diss., Université de Lorraine, 2013. http://www.theses.fr/2013LORR0141.
Full textThe objective of this dissertation is to develop observers and observer-based controllers synthesis methods for time-delay systems. Different classes of systems were treated with different types of delay. Three different methods were developed. The first one treats nonlinear systems with Lipschitz nonlinearities and consists in transforming the original system into an LPV system based on a reformulation of the classical Lipschitz property. This technique was formulated for continuous and discrete cases respectively and it was proven to provide less restrictive synthesis conditions when compared to the existing results in the literature. The second method deals with singular systems with disturbances. The main difficulty lay in the presence of the derivatives of the disturbances which hinder the stability analysis and for which two approaches are proposed:~a H∞ criterion combined with a special Lyapunov-Krasovskii functional depending on disturbances and a {W}^{1,2} criterion based on the use of Sobolev norms. The last method is based on the Free Weighting Matrices technique to solve the observation and control problems of a class of nonlinear systems with unknown delays. The proposed solution provides a sufficient LMI synthesis condition ensuring the asymptotic stabilization of the closed loop system, instead of the iterative LMI condition usually found in the literature
Bonnet, Catherine. "Réalisation et réduction dans la base d'équilibre de systèmes de dimension infinie à temps discret : application à des systèmes fractionnaires et extension à des systèmes postfiltrés." Aix-Marseille 1, 1991. http://www.theses.fr/1991AIX11386.
Full textKoster, Jacobus. "Systèmes linéaires creux et non symétriques : résolution en parallèle et reordonnancement." Toulouse, INPT, 1997. http://www.theses.fr/1997INPT108H.
Full textNõmm, Sven. "Réalisation et identification des systèmes non linéaires en temps discret." Nantes, 2004. http://www.theses.fr/2004NANT2066.
Full textThe majority of techniques for the analysis, modeling and control design of nonlinear discrete-time systems are based on classical state space form. By the way there is large variety of sophisticated results achieved in parameter identification of input-output systems. In spite of advances in both fields there is a great gap between the two, namely, while the parameters of model can be precisely identified by some identification technique, the model structure itself does not always admit a classical state-space realization, which makes it highly undesirable for further analysis and control design. The major contributions of the present work are made in solving the realization problem in terms of the structural properties of certain subclasses of systems and in the definition and characterization of different notions of identifiability. Also the problems of the reduction and input-output decoupling by static output feedback have been solved. An algebraic framework adapted to the problems of system analysis, modeling and control design were used as a main tool of the research. Linearization techniques were used as an approach for power consumption management for the power amplifier of mobile devices in telecommunications
Aoun, Mohamed. "Systèmes linéaires non entiers et identification par bases orthogonales non entières." Bordeaux 1, 2005. http://www.theses.fr/2005BOR13043.
Full textDécamps, Jérôme. "Méthodes itératives par blocs pour la résolution de problèmes linéaires et non linéaires à structures partiellement séparables." Toulouse, INPT, 1997. http://www.theses.fr/1997INPT092H.
Full textMontoya-Murillo, José. "Sur la commande des systèmes structurés et des systèmes non linéaires récursifs." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0160.
Full textXu, Aiping. "Observateurs adaptatifs non-linéaires et diagnostic de pannes." Rennes 1, 2002. http://www.theses.fr/2002REN10056.
Full textHayek, Naïla. "Contribution à l'étude de certains systèmes différentiels et fonctionnels." Paris 9, 1991. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1991PA090019.
Full textJerbi, Hamadi. "Quelques résultats sur la stabilisation des systèmes non linéaires par estimation et retour d'état." Metz, 1994. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1994/Jerbi.Hamadi.SMZ9414.pdf.
Full textThe aim of this thesis is the study of some problems on the stabilization of nonlinear systems using an observer configuration. In the first part we give necessary and sufficient conditions, algebraically computable, for the global asymptotic stabilization of homogeneous affine systems. It turns out that the stabilizability is equivalent to the asymptotic controllability to the origin. In the tthird chapter we deal with planar bilinear systems and we consider constained stabilizing homogenous feedback law of degree zero. In the case when B has no zero a simple eigenvalus we prove that the system is stabilizable using a like Kalman observer configuration. In the last chapter we deal with single-input-single-output systems. We propose a low-gain Pi-controller which stabilzes and regulates the system. Our result generalizes the previous one of Pohjolainen (1982) in that the semigroup is not necessarily holomorphic. A numerical example will be given to illustrate the application of the theory
Eichenmüller, Gérard. "Réduction et intégration symbolique des systèmes d'équations différentielles non-linéaires." Phd thesis, Université Joseph Fourier (Grenoble), 2000. http://tel.archives-ouvertes.fr/tel-00006744.
Full textClaude, Daniel. "Découplage et linéarisation des systèmes non linéaires par bouclages statiques." Paris 11, 1986. http://www.theses.fr/1986PA112174.
Full textDecoupling consists of separating at will, by means of regular or non-regular feedbacks, the combined action of the inputs on the outputs of a system. Linearization corresponds to the search for usual transformations in control which make it possible to cause a nonlinear system to behave in the same way as a linear system. We take a functional point of view which allows us to include and to generalize the recent geometric approach as well as the algebraic method, called Porter's method and known to engineers, both for decoupling and for linearization. We consider all decoupling problems as connected disturbance rejections and we then clear the common structure of different types of decoupling. We also show how to obtain feedback laws. An entire study of noninteracting control (Morgan’s problem) by regular static state feedbacks, as well as the treatment of other kinds of decoupling problems, illustrates our point of view. In linearization, we show how other methods are connected with our own, through theoretical development as well as the treatment of numerous examples. The study concludes with a discussion of the single point mooring of a tanker, with wind and current disturbances, and the analysis of a neuroendocrinological model. In these two cases, we propose a new approach which takes into particular consideration the constraints due to natural boundaries to which the two systems are subject
Jouffroy, Jérôme. "Stabilité et systèmes non linéaires : réflexions sur l'analyse de contraction." Chambéry, 2002. http://www.theses.fr/2002CHAMS012.
Full textDestyl, Edes. "Modélisation et analyse de systèmes d'équations de Schrödinger non linéaires." Thesis, Antilles, 2018. http://www.theses.fr/2018ANTI0283/document.
Full textThe works of this thesis concern the modeling and the numerical study of thesystems of two coupled nonlinear Schrödinger equations. At first, we considered aparity-time-symmetric system of the two coupled nonlinear Schrödinger (NLS) equationsthat modeled phenomenons in birefringent nonlinear optical fiber. We studythe behavior of the solution in some spaces like the Sobolev space H1. And we studythe numerical aspect of the model which clearly shows the behavior of the solutionin the chosen space. For the same model in higher dimension, we establish sufficientconditions for the initial conditions to blow up in finite time for some nonlinearityand for others we do the numerical study of the model and we present some casesof blowing up of the solution in finite time and also of the solutions of the modelthat exist all the time. On the other hand, we address a new model of discrete nonlinearSchrödinger equations PT -symmetric. A such model describes dynamics inthe chain of weakly coupled pendula pairs near the resonance between the parametricallydriven force and the linear frequency of each pendulum. In order to studythe stability of the pendulums, we establish sufficient conditions on the parametersof the model so that the equilibrium solution is stable. Numerical experiments arepresented to validate the analytical results and to characterize the unstabilizationof the coupled pendulum chain in the region of instability
Nadri, Madiha. "Observation et commande des systèmes non linéaires et application aux bioprocédés." Lyon 1, 2001. http://www.theses.fr/2001LYO10013.
Full textBenoît-Marand, François. "Modélisation et identification des systèmes non linéaires par réseaux de neurones à temps continu : application à la modélisation des interfaces de diffusion non linéaires." Poitiers, 2007. http://www.theses.fr/2007POIT2274.
Full textThis thesis presents a new model for the identification of nonlinear systems : continuous time neural networks (RNTC). These structures employ networks of formal neurons to approach the nonlinear laws that control the system but, contrary to the neural networks models presented in the literature, our model deals the problem in continuous time. Whatever, through various applications, we show that the model allows us to identify various nonlinear processes with a high accuracy. Moreover, in using a model reduction stage, it is possible to revert, from the neural network model, to the characteristic values of the system. Finally, we indicate how to adapt the continuous time neural network model to the case of fractionnal systems and we consider the problem of identification of diffusive nonlinear interfaces. By introducing a new operator of fractional integration, and by integrating it into the continuous time neural network model, we show how to approach the temporal behavior of these particular systems
Maatoug, Tarak. "Synthèse d'observateurs adaptatifs pour les systèmes non linéaires." Phd thesis, Université de Caen, 2009. http://tel.archives-ouvertes.fr/tel-01058802.
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