Дисертації з теми "Systèmes linéaires et non linéaires à commutation"
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Ben, Salah Jaâfar. "Analyse et commande des systèmes non linéaires complexes : application aux systèmes dynamiques à commutation." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00599364.
Повний текст джерелаBourdais, Romain. "Une contribution à la modélisation et à la commande des systèmes non linéaires à commutation." Phd thesis, Ecole Centrale de Lille, 2007. http://tel.archives-ouvertes.fr/tel-00259420.
Повний текст джерелаMarquez-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.
Повний текст джерелаOn 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.
Ducarne, Julien. "Modélisation et optimisation de dispositifs non-linéaires d’amortissement de structures par systèmes piézoélectriques commutés." Thesis, Paris, CNAM, 2009. http://www.theses.fr/2009CNAM0633/document.
Повний текст джерелаIn order to reduce the vibrations of a mechanical structure, one can use piezoelectric elements connected to passive electrical circuits. The goal is to achieve the same efficiency as active vibration control without the associated complexity and energy consumption. First the use of a resistor (with an effect similar to viscous damping) and eventually of an inductor (allowing the creation of a tuned resonator) for the circuit is considered. These systems have interesting properties, but are not very efficient, except in the case of a finely tuned inductor. In order to obtain good performance without requiring a precise tuning, a switching circuit is considered. The switching process is synchronized on the vibrations, and the effect of the free electric charge (similar to a dry damping) reduces the vibrations. This system is self-adaptive and can be self-powered. However, the strong non-linearities create a high frequency excitation which may disturb the switch timing. Two different reduced electromechanical models (analytical and finite element) are proposed, allowing a description of the whole system dynamics with accuracy and to emphasize the coupling between one vibration mode and the circuit. This coupling is found to be decisive for the performance in vibration reduction. A study of the influence of various parameters allow the optimisation of the piezoelectric elements, electric circuits and switch timing. These results are experimentally tested and a good agreement with the predictions is obtained ; the difficulty of switch timing is also noticed
Ducarne, Julien. "Modélisation et optimisation de dispositifs non-linéaires d'amortissement de structures par systèmes piézoélectriques commutés." Phd thesis, Conservatoire national des arts et metiers - CNAM, 2009. http://tel.archives-ouvertes.fr/tel-00464513.
Повний текст джерелаCavichioli, Gonzaga Carlos. "Analyse de stabilité et de performances d'une classe de systèmes non-linéaires à commutations en temps discret." Phd thesis, Université de Lorraine, 2012. http://tel.archives-ouvertes.fr/tel-00762873.
Повний текст джерелаCavichioli, Gonzaga Carlos Alberto. "Analyse de stabilité et de performance d'une classe de systèmes non-linéaires à commutations en temps discret." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0086/document.
Повний текст джерелаIn this PhD thesis, several problems of stability analysis and control design of discrete-time switched nonlinear systems are addressed. As main contribution, a new class of Lyapunov functions which takes the nonlinearity into account has been proposed. We show that these functions are suitable to solve the classical stability analysis problem of linear systems connected to a cone bounded nonlinearity. Instead of the original Lyapunov Lur'e function, the assumptions about the nonlinearity variation are not required. Furthermore, the local stability analysis and control synthesis problems of Lur'e systems subject to control saturation are tackled by considering the level set of our function as an estimate of the basin of attraction. We expose that this estimate, which is given by non-convex and disconnected sets, is less conservative than ellipsoidal sets. We extend these results in order to deal with the problems of stability analysis and stabilization of discrete-time switched nonlinear systems. On one hand, we consider the case of arbitrary switching such that our sufficient conditions assure the properties of stability for all possible switching rules. In this framework, we highlight that our function is able to provide a suitable estimate of the basin of attraction. On the other hand, we tackle the problem of switching rule design aiming at the stabilization of discrete-time switched systems with nonlinear modes. We propose a switching strategy depending on the minimum of our switched Lyapunov Lur'e function. Hence, our framework leads to state space partitions, related to the mode activation, which are not restricted to conic sets, commonly exhibited by the switched quadratic functions approaches
Tognetti, Taïs Calliero. "Commande de systèmes dynamiques : stabilité absolue, saturation et bilinéarité." Toulouse, INSA, 2009. http://eprint.insa-toulouse.fr/archive/00000405/.
Повний текст джерелаThis thesis presents contributions to the solution of theproblems of stability analysis and synthesis of state feedback controllers for dynamic systems with non-linear elements, by means of conditions based on linear matrix inequalities and Lyapunov functions. For switched systems subject to saturation in the actuators, convex conditions to design switched and robust controllers are presented. The saturation is modeled as a sector non-linearity and an estimate of the domain of stability is determined. For linear systems with polytopic uncertainties and sector non-linearities, convex conditions of finite dimension to build Lur’e functions with homogeneous polynomially parameter dependence are provided. If satisfied, the conditions guarantee the stability of the entire domain of uncertainty for all sector non-linearities, allowing the design oflinear and non-linear robust statefeedback stabilizing controllers. For continuous and discrete-time unstable bilinear systems, a procedure to design a state feedback stabilizing control gain is proposed. The method is based on the alternate solution of two convex optimization problems described by linear matrix inequalities, providing an estimate of the domain of stability. Extensions to handle robust and linear parameter varying controllers are also presented
Ait, Ladel Ayyoub. "Commande tolérante aux défauts des systèmes à multimodèles : application à des systèmes à multi-source d'énergie." Electronic Thesis or Diss., Aix-Marseille, 2022. http://theses.univ-amu.fr.lama.univ-amu.fr/220330_AITLADEL_882kmyqu655hkbca383zrkcz402ihwf_TH.pdf.
Повний текст джерелаThis thesis deals with the fault detection/estimation and fault-tolerant control challenges through integrated design. The aim is to design control strategies able to maintain robust and acceptable performance even in the presence of faults. The considered systems are dynamic in nature and are multi-model. The approaches proposed in this thesis consist in formalizing the integrated design of the detection/estimation and fault-tolerant control units in the form of linear matrix inequalities to overcome the difficulty posed by the observer/controller coupling. These approaches provide the ability to consider the different interactions between the system, the detection/estimation unit, and the control unit. Therefore, ensuring a global stability analysis of the closed-loop system and robust performances in terms of detection/estimation, control, and fault compensation. The thesis is mainly composed of three parts. In the first part, results on the control in the presence of sensor or actuator faults are established for switched linear systems. In the second part, extensions to switched nonlinear systems with sensor and actuator faults are proposed. Finally, the third part consists of a complete study of a renewable energy system. It is a multi-source/multi-load system designed to meet multiple demands and is subject to the intermittency of renewable energies
Tognetti, Calliero. "Commande de systèmes dynamiques: stabilité absolue, saturation et bilinéarité." Phd thesis, INSA de Toulouse, 2009. http://tel.archives-ouvertes.fr/tel-00621132.
Повний текст джерелаChalh, Zakaria. "Approche algébrique et graphique pour l'analyse des modèles Bond Graph." Ecole Centrale de Lille, 2008. http://www.theses.fr/2008ECLI0002.
Повний текст джерелаThe objective of this dissertation is to study the structural properties of linear time varying dynamic systems from their bond graph model and their equivalent module. After a brief reminder of the theory of modules and structural properties of systems by LTI bond graph approach, the various methods used to study the structural properties and their interpretation by the theory of modules, a comparison between the two approaches is proposed. To achieve these objectives, we used tools and concepts such as the notion of ring non-commutative bond graph, the principle of duality on linear time varying systems and bicausality. Thanks to these concepts we have introduced new methodologies. In particular, a new graphic rule for calculating the elements of the controllability and observability matrix, the calculation of the non ordered representing the torsion sub-module of the system equivalent torsion module, and with the principle of duality we deduce the non-observable from the calculation of the non controllable part of the dual system. We propose a graphic method of formal calculation of the invariants zero of systems LTV by using the principle of the bicausality what enables us to apply certain constraints. The determination of the non-controlled and non-observable helps us determine the zeros decoupling inbound and outbound
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.
Повний текст джерелаBecis-Aubry, Yasmina. "Contribution à l'estimation ensembliste des systèmes linéaires et non-linéaires." Nancy 1, 2003. http://www.theses.fr/2003NAN10190.
Повний текст джерелаThe 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
Pellat, Dominique. "Bistabilité optique dans les microrésonateurs et applications aux systèmes de commutation optique." Aix-Marseille 3, 1995. http://www.theses.fr/1995AIX30054.
Повний текст джерелаZiane, 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.
Повний текст джерелаBarillon, 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.
Повний текст джерелаIn 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.
Повний текст джерелаOlech, Michał. "Systèmes d'évolution non linéaires et leurs applications." Paris 11, 2007. http://www.theses.fr/2007PA112250.
Повний текст джерелаThe 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
Theilliol, Didier. "Identification de systèmes siso linéaires et non linéaires par réseaux de neurones multicouches." Nancy 1, 1993. http://www.theses.fr/1993NAN10261.
Повний текст джерелаZerrougui, Mohamed. "Observation et commande des systèmes singuliers non linéaires." Phd thesis, Université Henri Poincaré - Nancy I, 2011. http://tel.archives-ouvertes.fr/tel-00705339.
Повний текст джерелаJouan, Philippe. "Singularités des systèmes non linéaires. Observabilité et observateurs." Rouen, 1995. http://www.theses.fr/1995ROUES032.
Повний текст джерелаTatuam, Kamga Christophe. "Transmissivité et instabilité de systèmes non linéaires finis." Dijon, 1993. http://www.theses.fr/1993DIJOS050.
Повний текст джерелаNaciri, Saïd. "Stabilité des systèmes commutés non linéaires. Vitesses de convergence." Rouen, 2015. http://www.theses.fr/2015ROUES060.
Повний текст джерелаA switched system is a family of vector fields together with a law that indicates at each time which vector field is responsible for the evolution of the system. In general, this law is given by a piecewise constant function of time. This kind of differential systems which are a mixture of continuous dynamics and discrete events allow to model complex phenomena, often encountered in Automatic control. In this PhD thesis, we are interested in the stability properties of switched systems, which has been extensively studied the last two decades. Such a system is said to be asymptotically stable at an equilibrium point if the system is not sensitive to perturbations around this point and all solutions converge to this equilibrium. In practice, the switching law being unknown, it is crucial to find conditions guaranteeing that the switched system is asymptotically stable for arbitrary switching laws. The main difficulty resides in the fact that a property satisfied by all the subsystems does not automatically transpose to the switched system. Lyapunov functions, which play the role of the energy of the system, remain a powerful tool in the stability analysis of switched systems. In this work, we mainly deal with switched systems given by a family of vector fields that share a common weak Lyapunov function. We present a result that can be viewed as a generalization of the LaSalle’s invariance principle to switched systems, then we derive sufficient conditions for the stability. We establish a link between the stability properties of switched system and the observability of a sub-system whose dimension is in most cases much smaller. Next, we turn our attention to the convergence rate of the solutions of such systems
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.
Повний текст джерелаZerkaoui, Salem. "Commande neuronale adaptative des systèmes non linéaires." Le Havre, 2007. http://www.theses.fr/2007LEHA0010.
Повний текст джерелаThe 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.
Повний текст джерелаThis 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.
Повний текст джерелаWalking 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.
Повний текст джерелаThis 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
Hassan, Lama. "Observation et commande des systèmes non linéaires à retard." Phd thesis, Université de Lorraine, 2013. http://tel.archives-ouvertes.fr/tel-00934943.
Повний текст джерелаBouchel, Olivier. "Quelques équations et systèmes d'équations de Schrödinger non linéaires." Paris 11, 2006. http://www.theses.fr/2006PA112243.
Повний текст джерелаThis 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.
Повний текст джерелаBen, Amor Selwa. "Observation et commande de systèmes non linéaires temps-discret." Lyon 1, 1997. http://www.theses.fr/1997LYO10124.
Повний текст джерелаKazakos, Démosthène. "Sur l'observabilité et les observateurs de systèmes non-linéaires." Grenoble INPG, 1987. http://www.theses.fr/1987INPG0006.
Повний текст джерелаMotchon, 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.
Повний текст джерелаThe 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
Koster, Jacobus. "Systèmes linéaires creux et non symétriques : résolution en parallèle et reordonnancement." Toulouse, INPT, 1997. http://www.theses.fr/1997INPT108H.
Повний текст джерелаNõmm, Sven. "Réalisation et identification des systèmes non linéaires en temps discret." Nantes, 2004. http://www.theses.fr/2004NANT2066.
Повний текст джерелаThe 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.
Повний текст джерелаMontoya-Murillo, José. "Sur la commande des systèmes structurés et des systèmes non linéaires récursifs." Grenoble INPG, 1995. http://www.theses.fr/1995INPG0160.
Повний текст джерелаDécamps, 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.
Повний текст джерелаBenamara, Ahmed. "Contribution à l'extraction des paramètres inertiels non linéaires des structures semiconductrices." Toulouse, INPT, 1993. http://www.theses.fr/1993INPT035H.
Повний текст джерелаHayek, Naïla. "Contribution à l'étude de certains systèmes différentiels et fonctionnels." Paris 9, 1991. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1991PA090019.
Повний текст джерелаEichenmüller, 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.
Повний текст джерелаClaude, Daniel. "Découplage et linéarisation des systèmes non linéaires par bouclages statiques." Paris 11, 1986. http://www.theses.fr/1986PA112174.
Повний текст джерелаDecoupling 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.
Повний текст джерелаDestyl, Edes. "Modélisation et analyse de systèmes d'équations de Schrödinger non linéaires." Thesis, Antilles, 2018. http://www.theses.fr/2018ANTI0283/document.
Повний текст джерелаThe 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.
Повний текст джерелаXu, Aiping. "Observateurs adaptatifs non-linéaires et diagnostic de pannes." Rennes 1, 2002. http://www.theses.fr/2002REN10056.
Повний текст джерелаJerbi, 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.
Повний текст джерелаThe 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
Benoît-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.
Повний текст джерелаThis 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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