Dissertations / Theses on the topic 'Système linéaire non stationnaire'
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Lahaye, Sébastien. "Contribution à l'étude des systèmes linéaires non stationnaires dans l'algèbre des dioïdes." Angers, 2000. http://www.theses.fr/2000ANGE0028.
Full textDiscrete event dynamic systems involving synchronization nd saturation phenomena can be modeled by linear equations in some dioids. Starting from this property a so-called linear system theory in dioids, which presents great analogies of form with the classical linear system theory, has been developed. This report is devoted to the study of non stationary linear systems in dioids. As in conventional system theory, one can claim that the non-stationary nature of a system is induced by possible variations of its state-space realization parameters. We tackle the problems of representation for these systems (input-output representation and state-space representation). A control problem, more precisely the output tracking problem, is solved. We also study a subclass of non stationary linear systems as a guideline, an analyses proper to linear periodic systems in dioids is proposed. In addition, two Petri nets subclasses have been defined in order to characterize ((max, +) and (min, +) non stationary linear systems. The proposed results find some applications in production control, notably for the just-in-time production control of workshops, as well as for the simulation and the performance evaluation of assembly lines
Nguyên, Thùy Liên. "Quelques problèmes variationnels issus de la théorie des ondes non-linéaires." Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1386/.
Full textThis thesis focuses on the study of special solutions (traveling wave and standing wave type) for nonlinear dispersive partial differential equations in R^N. The considered problems have a variational structure, the solutions are critical points of some functionals. We demonstrate the existence of critical points using minimization methods. One of the main difficulties comes from the lack of compactness. To overcome this, we use some recent improvements of P. -L. Lions concentration-compactness principle. In the first part of the dissertation, we show the existence of the least energy solutions to quasi-linear elliptic equations in R^N. We generalize the results of Brézis and Lieb in the case of the Laplacian, and the results of Jeanjean and Squassina in the case of the p-Laplacian. In the second part, we show the existence of subsonic travelling waves of finite energy for a Gross-Pitaevskii-Schrödinger system which models the motion of a non charged impurity in a Bose-Einstein condensate. The obtained results are valid in three and four dimensional space
Tordeux, Antoine. "Étude de processus en temps continu modélisant l'écoulement de flux de trafic routier." Phd thesis, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00596941.
Full textEl, Akchioui Nabil. "Fluidification des réseaux de Petri stochastiques : application aux études de fiabilité des systèmes." Le Havre, 2012. http://www.theses.fr/2012LEHA0014.
Full textReliability analysis based on discrete event systems and particularly on stochastic Petri nets, improves the safety of industrial processes and systems. For large scale systems, the fluidification of stochastic processes is useful to reduce the computational resources and also the duration of simulations. But global and direct fluidification that preserves the structure and the parameters of the original model leads to a biased estimation of the reliability indicators. This study explores innovative approaches to fluidify stochastic Petri nets. When the marking space has several regions, piecewise constant continuous Petri nets are introduced to divide the marking trajectory into several phases in order to reach a steady state identical with the steady state of the stochastic process. Homothetic and projective transformations are also proposed to reach a steady state that is partially homothetic to the one of the stochastic process. Finally, adaptive modifications of the parameters are used to correct progressively the mean marking. All proposed results contribute to design fluid models with asymptotic behaviours equivalent to the ones of a stochastic process
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
Le, Ber Catherine. "Simulation sur ordinateur d'un système linéaire continu et stationnaire." Brest, 1988. http://www.theses.fr/1988BRES2020.
Full textPerruquetti, Wilfrid. "Sur la stabilité et l'estimation des comportements non linéaires non stationnaires perturbés." Lille 1, 1994. http://www.theses.fr/1994LIL10049.
Full textBen, slimene Byrame. "Comportement asymptotique des solutions globales pour quelques problèmes paraboliques non linéaires singuliers." Thesis, Sorbonne Paris Cité, 2017. http://www.theses.fr/2017USPCD059/document.
Full textIn this thesis, we study the nonlinear parabolic equation ∂ t u = ∆u + a |x|⎺⥾ |u|ᵅ u, t > 0, x ∈ Rᴺ \ {0}, N ≥ 1, ⍺ ∈ R, α > 0, 0 < Ƴ < min(2,N) and with initial value u(0) = φ. We establish local well-posedness in Lq(Rᴺ) and in Cₒ(Rᴺ). In particular, the value q = N ⍺/(2 − γ) plays a critical role.For ⍺ > (2 − γ)/N, we show the existence of global self-similar solutions with initial values φ(x) = ω(x) |x|−(2−γ)/⍺, where ω ∈ L∞(Rᴺ) is homogeneous of degree 0 and ||ω||∞ is sufficiently small. We then prove that if φ(x)∼ω(x) |x| ⎺(²⎺⥾)/⍺ for |x| large, then the solution is global and is asymptotic in the L∞-norm to a self-similar solution of the nonlinear equation. While if φ(x)∼ω(x) |x| (x)|x|−σ for |x| large with (2 − γ)/α < σ < N, then the solution is global but is asymptotic in the L∞-norm toe t(ω(x) |x|−σ). The equation with more general potential, ∂ t u = ∆u + V(x) |u|ᵅ u, V(x) |x |⥾ ∈ L∞(Rᴺ), is also studied. In particular, for initial data φ(x)∼ω(x) |x| ⎺(²⎺⥾)/⍺, |x| large , we show that the large time behavior is linear if V is compactly supported near the origin, while it is nonlinear if V is compactly supported near infinity. we study also the nonlinear parabolic system ∂ t u = ∆u + a |x|⎺⥾ |v|ᴾ⎺¹v, ∂ t v = ∆v + b |x|⎺ ᴾ |u|q⎺¹ u, t > 0, x ∈ Rᴺ \ {0}, N ≥ 1, a,b ∈ R, 0 < y < min(2,N)? 0 < p < min(2,N), p,q > 1. Under conditions on the parameters p, q, γ and ρ we show the existence and uniqueness of global solutions for initial values small with respect of some norms. In particular, we show the existence of self-similar solutions with initial value Φ = (φ₁, φ₂), where φ₁, φ₂ are homogeneous initial data. We also prove that some global solutions are asymptotic for large time to self-similar solutions. As a second objective we consider the nonlinear heat equation ut = ∆u + |u|ᴾ⎺¹u - |u| q⎺¹u, where t ≥ 0 and x ∈ Ω, the unit ball of Rᴺ, N ≥ 3, with Dirichlet boundary conditions. Let h be a radially symmetric, sign-changing stationary solution of (E). We prove that the solution of (E) with initial value λ h blows up in finite time if |λ − 1| > 0 is sufficiently small and if 1 < q < p < Ps = N+2/N−2 and p sufficiently close to Ps. This proves that the set of initial data for which the solution is global is not star-shaped around 0
Przybylski, C. "Sur la réduction structurelle des systèmes continus non linéaires à coefficients presque périodiques." Lille 1, 1986. http://www.theses.fr/1986LIL10140.
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
Taoud, Jamal Eddine. "Commandes optimales d'un système thermique non linéaire." Nantes, 1991. http://www.theses.fr/1991NANT2076.
Full textLarroque, Benoît. "Observateurs de systèmes linéaires : application à la détection et localisation de fautes." Phd thesis, Toulouse, INPT, 2008. http://oatao.univ-toulouse.fr/7684/1/larroque.pdf.
Full textAyadi, Mounir. "Contributions à la commande des systèmes linéaires plats de dimension finie." Toulouse, INPT, 2002. http://www.theses.fr/2002INPT025H.
Full textMuñoz, Hernández Laura Elena. "Stabilisation d'un véhicule aérien autonome en présence de vent." Compiègne, 2012. http://www.theses.fr/2012COMP2055.
Full textThis thesis is focused in the design of original and robust control strategies to stabilize an Unmanned Aerial Vehicle (UAV) in presence of wind disturbances. The proposed control strategies have been tested in simulations and in real-time experiments in two different platforms. It introduces the mathematical model of a UAV in presence of wind. We obtained the dynamical model which takes into account the complementary forces induced by the wind for a Planar Vertical Take-Off and Landing (PVTOL) aircraft and for the quadrotor rotorcraft. On the other hand, three different nonlinear control laws based on the Lyapunov analysis have been developed to stabilize the UAV in presence of wind. The first approach uses the Robust Control Lyapunov Functions (RCLFs). Given the complexity of the problem, we begun with a mini car which moves on its longitudinal axis. This result has been extended to the case of the PVTOL aircraft and to the quadrotor rotorcraft. Several simulations have been carried out to validate the proposed algorithms. To test its viability in a real application, we have realized experiments using a PVTOL prototype. The simulations and experimental results in real time showed the good performance of the control law in closed loop. The second approach is based on the saturation functions. We have proposed a robust analysis with respect to unknown external disturbances and nonlinear uncertainties in the model. The proof takes the hypothesis that the wind is bounded. The algorithms have been tested in a quadrotor prototype and the results showed a good performance even in presence of wind disturbances. The last approach considers the intrinsic properties of the quadrotor flying vehicle, specially the passivity. Thus, a sub-optimal control law has been developed. The analysis is based on the full energy of the system, the passivity, the Lyapunov theory and the use of dynamic programming. The simulation results have showed that this control law can be useful when the flying vehicle has to do more complex maneuvers than hover. Finally, a control scheme using a state observer has been developed. This scheme uses the Extended Kalman Filter (EKF) to estimate the position in the (x,y) plain and the vertical velocity z of a quadrotor rotorcraft. Using the measurements of an inertial measurement unit, an altitude sensor, a vision system and the control inputs the system state is estimated. The vision system is used to compute the translational velocities of the vehicle and it is composed by a camera and an optical flow algorithm. The estimator has been validated by experiments in real time and the results have been very conclusive
Fossa, Manuel. "Variabilité hydroclimatique en France et dans la zone Euro-Atlantique : Aspects non-lineaires et non-stationnaires." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR011.
Full textThe works presented in this thesis explore the non-linearity and non-stationarity aspects of the hydroclimate system in France and the Euro-Atlantique area. In part I, «Spatio-temporal scales of hydroclimate variability in France», classifications of precipitation, temperature and discharge time series of 152 watersheds were established, based on non-linear and non-stationary characteristics. In particular, we based our classifications on spectral contents and cross-scale, phase-phase, phase-amplitude interactions. Results show clear homogeneous regions for each variable, but with complex spectral content and cross-scale interactions. Part II, « Spatiotemporal of local and large-scale climate variability», we studied how the watershed modulation altered the spectral correlation between local climate (precipitation, temperature) and discharge. We then studied the large-scale atmospheric patterns linked to discharge, with a combined spatial and temporal spectral analysis. Results show than temperature is the main driver of discharge at the annual scale, but precipitation is the main driver for other time scales. The large scale atmospheric patterns linked to discharge were shown to be time scale dependent and heavily modulated from West to east, with interacting atmospheric components shifting the main time scales of spectral correlation with discharge. Finally, Part III « North Atlantic atmospheric circulation dynamics», introduces a new conjecture linking the geometrical theory of the extremal length (a conformal invariant) and conservative atomspheric systems, such as the North Atlantic atmospheric circulation. We have shown that the time invariance of the extremal length implies conservation in mechanical energy within the atmospheric system, and that the increase/decrease of invariance induces mechanical energy losses/gains. The application of the theory to the North Atlantic atmospheric circulation, shows that depending on the time scale, the dynamics are vastly different, ranging for asymptotically stable to unstable, and that the atmospheric circulation for the last 40 years has seen large changes in its dynamics. Through this thesis, we showed the importance of time scale dependence, interactions between them, and more generally, of non-linearity and non-stationarity. We encourage hydrologist and climate scientists to adopt a combined physics-statistical approach in order to better grasp the complexity of hydroclimate systems
Sabatier, Jocelyn. "La dérivation non entière en modélisation des systèmes à paramètres distribués récursifs et en commande robuste des procédés non stationnaires." Bordeaux 1, 1998. http://www.theses.fr/1998BOR11939.
Full textEl, Hamidi Mohamed. "Propriétés stochastiques d'un système non-linéaire en dimension finie." Pau, 1989. http://www.theses.fr/1989PAUU3014.
Full textGherari, Zineddine. "Stratégie de commandes neurofloues pour un système continu non linéaire." Paris 12, 1998. http://www.theses.fr/1998PA120062.
Full textDesceliers, Christophe. "Dynamique non linéaire en déplacements finis des structures tridimensionnelles viscoélastiques en rotation." Châtenay-Malabry, Ecole centrale de Paris, 2001. http://www.theses.fr/2001ECAPO720.
Full textHoernel, Jean-David. "Etudes théorique et numérique d'un modèle non-stationnaire de catalyseurs à passages cylindriques." Phd thesis, Université de Haute Alsace - Mulhouse, 2002. http://tel.archives-ouvertes.fr/tel-00002403.
Full textNous établissons l'existence et l'unicité de la solution, ainsi que quelques propriétés qualitatives de cette solution, en particulier l'existence de bornes supérieures et inférieures. Nous étudions également le comportement limite de la solution quand le temps tend vers l'infini.
Nous mettons ensuite en oeuvre une méthode numérique permettant d'obtenir des courbes décrivant le comportement de la solution.
Fantoni-Coichot, Isabelle. "Commande non linéaire des systèmes mécaniques sous-motorisés." Compiègne, 2000. http://www.theses.fr/2000COMP1301.
Full textNicolas, Jean-Philippe. "L'équation non linéaire de Klein-Gordon et le système linéaire de Dirac en métrique de type Schwarzschild." Bordeaux 1, 1994. http://www.theses.fr/1994BOR10501.
Full textAiriau, Christophe. "Stabilité linéaire et faiblement non linéaire d'une couche limite laminaire incompressible par un système d'équations parabolisé (PSE)." Toulouse, ENSAE, 1994. http://www.theses.fr/1994ESAE0023.
Full textChandra, Johanes. "Analyses expérimentales de la réponse sismique non-linéaire du système sol-structure." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENU023/document.
Full textThe concentration of population in urban areas in seismic-prone regions can generate more and more damages and losses. Seismic response in urban areas depends on site effects (direct amplification and nonlinearity of the soil) and the coupling between the soil and structures (soil-structure and site-city interaction). Therefore, the understanding of urban seismology, that is the ground motion incorporating the urban environment, is critical to reduce the damage. This requires the prediction of ground motion in urban areas, a fundamental element in the evaluation of the seismic hazard. Taking into account the amplification caused by the presence of sediment has been widely studied. However, the non-linearity of the soil and the coupling between the ground and the structure is seldom integrated to the prediction of the ground motion. Because of their complexity, these problems have been addressed separately. In this context, this dissertation analyzes the non-linear response of the soil-structure by integrating the non-linearity of the soil and the soil-structure interaction. Two experimental studies were performed, with the aim of providing a proxy that reflects the non-linearity of the soil. The first is the centrifuge test that reproduces the response of soil and structures at reduced scale. The state of stress and strain is conserved by applying an artificial acceleration model. This test was performed at IFSTTAR Nantes in the framework of the ANR ARVISE. Different configurations were tested with and without buildings, under different stress levels, to analyze the response of the soil and structures. The second uses the vertical accelerometric networks of two sites in California: Garner Valley Downhole (GVDA) and the Wildlife Liquefaction Array (WLA), both managed by the University of California, Santa Barbara (UCSB), USA. In-situ response is important since it describes the actual behavior of the site. Information describing the conditions of sites is widely available and the earthquakes recorded were used to test several levels of shaking to reconstruct the overall response of each site. In addition, the GVDA site is equipped with a Soil-Foundation-Structure-Interaction structure (SFSI) which aims to study the problems of soil-structure interaction. In both experiments, thanks to the vertical accelerometer network in the ground and the structure we are able to apply the 1D wave propagation method to extract the response of these systems. The waves are considered as an SH wave which propagates in a 1D horizontal layer. Seismic interferometry by deconvolution method is applied to extract the Impulse Response Function (IRF) of the 1D system. Thus the analysis of the variation in function of elastic properties of the soil and the structure is done under several magnitude of shaking, including variation in depth and the elements of the total response of the structure including the soil-structure interaction. At the end, a deformation proxy to evaluate and also to predict the nonlinear response of the soil, the structure and the soil-structure interaction is proposed
Honoré, Cécile. "La photochimie de l'Ozone à l'Echelle Urbaine, un Système Dynamique Non-Linéaire." Paris 6, 2000. http://www.theses.fr/2000PA066214.
Full textAlhamed, Aldwaihi Hani. "Commande non linéaire fondée sur la platitude d'un système de production éolien." Thesis, Brest, 2013. http://www.theses.fr/2013BRES0080/document.
Full textThe problem of the production of renewable energy, ``wind energy in our case'' is related to the adjustment of the amplitude and the frequency of the voltage of the generator driven by the wind turbine. These settings are required to supply the produced electrical power to an electrical network. The advancement of the power electronics used in the power converters (rectifiers, inverters, boost converters, etc.), helped to solve these two problems of adjustment. The challenge of wind generation is to improve the control strategy applied to the converters to increase the quality of the produced power and to minimize the electrical losses of the generator, and therefore to reduce the cost of production system. In this thesis, we developed the nonlinear flatness-based control of a wind generation system. This command is used to facilitate the construction of the control law. We have shown that this command allows the designer to choose the controller gains with few and intuitive tuning parameters. Electrical losses in the stator of the Permanent Magnets Synchronous Generator (PMSG) are minimized, the Maximum Power Point Tracking strategy (MPPT) is applied to the production system and the power factor of the apparent power injected to the grid is controlled to obtain any desired value between zero and one
Ghilani, Mustapha. "Simulation numérique de flammes planes stationnaires avec chimie complexe." Paris 11, 1987. http://www.theses.fr/1987PA112325.
Full textCourty, Jean-Michel. "Les fluctuations quantiques dans l'interaction d'un système non-linéaire avec un réservoir harmonique." Phd thesis, Université Pierre et Marie Curie - Paris VI, 1990. http://tel.archives-ouvertes.fr/tel-00011868.
Full textBinczak, Stéphane. "Etude d'un système expérimental de diffusion non linéaire : application au traitement du signal." Dijon, 1999. http://www.theses.fr/1999DIJOS003.
Full textMahé, Alexandre. "Caractérisation du comportement non-stationnaire du système d'admission d'air d'un moteur à combustion interne : incidence sur le remplissage." Ecole centrale de Nantes, 2011. https://hal.archives-ouvertes.fr/tel-01207529.
Full textThe aim of this PhD thesis is to develop a new characterization method of unsteady flow in internal combustion engine intake manifold. Then, an experimental setup was developed in order to generate pressure waves from a fast change in flow. The measurement method coupled to this device allows to obtain the air intake system impedance. This method is able to produce very high pressure oscillations which are similar to those encountered in an engine. On the other hand, an unsteady flow modelisation ofintake pipes was developed to assess the impact of the manifold geometry on the engine volumetric efficiency. The model parameters are then identified for each intake system by experimental characterizationresults from the test bench. Finally, the whole process is evaluated on a one cylinder engine test bench. Furthermore, a study of a line for admission of a multi-cylinder engine manifold was conducted
Ribot, Magali. "Étude théorique de méthodes numériques pour les systèmes de réaction-diffusion; application à des équations paraboliques non linéaires et non locales." Phd thesis, Université Claude Bernard - Lyon I, 2003. http://tel.archives-ouvertes.fr/tel-00004563.
Full textMuzard, Philippe. "Etude du comportement dynamique linéaire et non-linéaire d'un rotor d'hélicoptère : Application au couplage rotor-fuselage." Ecully, Ecole centrale de Lyon, 1994. http://bibli.ec-lyon.fr/exl-doc/TH_T1582_pmuzard.pdf.
Full textThe development of computing power and optimisation methods used by the engineers leads to a better design of structures. It has for first consequence the appearance of non linear phenomena affecting the dynamic behaviour which can modify in a large part the linear response. The first part of this work deals also with the insertion of non linearities in the modelling of helicopter rotor dynamics. We will show that non linearities can't be always neglected and leads sometimes to chaotic behaviour and even instability. A particular analysis of these phenomena is made using well-known methods - Volterra's series, normal form theory - in order to identify the main non linear parameters. The original aspect of this work lies in the application of non linear analysis to a multi-dimensional system which is close to reality. We will study afterwards the coupling between two linear structures. In the case of helicopter, the particularity is that the rotor is strongly gyroscopic. We will use a modal approach of the fuselage to simplify the analysis. Two directions will be explored. A simplified model permits us to identify the coupled degrees of freedom. A second modelling, taking into account numerous aerodynamic effects, will be used as a tool for conception and design of helicopters. At last, we will study an unstable coupling between rotor and fuselage through particular mechanical organs
Langlois, Sébastien. "Prédiction des vibrations éoliennes d'un système conducteur-amortisseur avec une méthode temporelle non linéaire." Thèse, Université de Sherbrooke, 2013. http://hdl.handle.net/11143/6133.
Full textRuiz, Virginie. "Estimation et prédiction d'un système évoluant de façon non linéaire : filtrage par densités approchées." Rouen, 1993. http://www.theses.fr/1993ROUE5018.
Full textMouelhi, Amjed. "Analyse et synthèse d’observateur pour l’inversion à gauche de classes de système non linéaire." Thesis, CY Cergy Paris Université, 2020. http://www.theses.fr/2020CYUN1063.
Full textThis thesis focuses on the left invertibility and the various additional difficulties such as the singularity of observability and the singularity of left invertibility which appear when observers for nonlinear systems and more specifically for chaotic systems are synthesized. Under certain conditions, these difficulties can overcomed using the dual immersion technique. The first part of this thesis deals with the dual immersion technique, which is based on submerging the outputs and their derivatives in space of more large dimension, in order to circumvent the singularities and to find new pathes to reconstruct the states and the information embedded in the system, at the end of this part an dual immersion algorithm is presented and an application of the algorithm is illustrated in the context of a single output chaotic autonomous system. More specifically, we considered the Lorenz circuit. The second part of this thesis is entirely devoted to a more complex application of the proposed method in the context of cryptography, we have considered the Qi circuit in two different configurations. In order to emphasize the robustness of the proposed approach, the two cases are validated by simulation on Matlab. To overcome the problems linked to the analogical implementation of chaotic systems, such as the sensitivity to external conditions like humidity, temperature and all variations of associated parameters which can modify the chaotic behavior of the system, we carried out a discrete experimental implementation. in real time, under rapid sampling, of the proposed method. Thus, the digital implementation of the transmission system based on the Qi circuit is proposed at the end of this part and tested experimentally on a (NI-MyRIO) module based on LabVIEW
Clément, Céline. "L'ontogenèse du contrôle temporel du comportement humain envisagé comme un système dynamique non linéaire." Lille 3, 1999. http://www.theses.fr/1999LIL30027.
Full textHajraoui, Abderrahmane. "Architecture multi-processeurs en automatisme non linéaire." Rouen, 1989. http://www.theses.fr/1989ROUES023.
Full textBudiwantoro, Bagus. "Identification temporelle des structures linéaires et non linéaires." Ecully, Ecole centrale de Lyon, 1990. http://www.theses.fr/1990ECDL0033.
Full textScorletti, Gérard. "Approche Unifiée de l'Analyse et de la Commande des Systèmes par Optimisation LMI." Phd thesis, Université Paris Sud - Paris XI, 1997. http://tel.archives-ouvertes.fr/tel-00009249.
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 textYengui, Hédi. "Modélisation du comportement dynamique non linéaire d'un système machine - outil - pièce lors d'une opération de fraisage." Phd thesis, Ecole Centrale Paris, 2011. http://tel.archives-ouvertes.fr/tel-00619636.
Full textZhou, Weijun. "Approche thermodynamique pour la commande d’un système non linéaire de dimension infinie : application aux réacteurs tubulaires." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10084/document.
Full textThe main objective of this thesis consists to investigate the problem of modelling and control of a nonlinear parameter distributed thermodynamic system : the tubular reactor. We address the control problem of this non linear system relying on the thermodynamic properties of the process. This approach requires to use the classical extensive variables as the state variables. We use the thermodynamic availability as well as the reduced thermodynamic availability (this function is formed from some terms of the thermodynamic availabilty) as Lyapunov functions in order to asymptotically stabilize the tubular reactor aroud a steady profile. The distributed temperature of the jacket is the control variable. Some simulations illustrate these results as well as the eficiency of the control in presence of perturbations. Next we study the Port Hamiltonian representation of irreversible infinite dimensional systems. We propose a Stokes-Dirac structure of a reaction-diffusion system by means of the extension of the vectors of the flux and effort variables. We illustrate this approach on the example of the reaction-diffusion system. For this latter we use the internal energy as well as the opposite of the entropy to obtain Stokes-Dirac structures. We propose also a pseudo-Hamiltonian representation for the two Hamiltonians. Finally we tackle the boundary control problem. The objective is to study the existence of solutions associated to a linearized model of the tubular reactor controlled to the boundary
Kessentini, Amir. "Modélisation du comportement dynamique non linéaire d'un système machine-outil-pièce lors d'une opération de perçage." Châtenay-Malabry, Ecole centrale de Paris, 2008. http://www.theses.fr/2008ECAP1077.
Full textDenis-Vidal, Lilianne. "Identification d'un système biochimique, modélisation et contrôle d'un système de réacteurs." Compiègne, 1993. http://www.theses.fr/1993COMPD640.
Full textThenint, Thibaud. "Etude d'un système non linéaire à chocs sous excitation large bande : application à un tube de générateur de vapeur." Phd thesis, Ecole Centrale Paris, 2011. http://tel.archives-ouvertes.fr/tel-00677440.
Full textFragkoulis, Dimitrios. "Détection et localisation des défauts provenant des capteurs et des actionneurs : application sur un système non linéaire." Phd thesis, Université Paul Sabatier - Toulouse III, 2008. http://tel.archives-ouvertes.fr/tel-00339630.
Full textTalj, Reine. "Modélisation et commandes non linéaires du système d’air des piles à combustible type PEM (Proton Exchange Membrane)." Paris 11, 2009. http://www.theses.fr/2009PA112139.
Full textThis thesis deals with the air supply system of PEM (Proton Exchange Membrane) fuel cells. The first part treats modelling, and consist on the reduction of the 4th order dynamical model into a simpler 3rd order one. The latter has been validated experimentally with a relative error less than 5%. The reduced model has been decomposed into the interconnection of 3 subsystems, with one of them being output strictly passive; and a cascaded control structure has been designed. A passivity based stability study results in a general methodology for tuning any controller, with guaranteed stability of the closed-loop system. Moreover, another stability study, based on the monotonicity characteristics of the system, shows that the system is locally asymptotically stabilisable around any equilibrium point, with a simple proportional or proportional-integral controller, if the feedback variable is well chosen. Many control laws have been designed to regulate the compressor air flow and the oxygen stoechiometry. The used controllers are higher order sliding mode, rst, ip, backstepping, and ors (output regulation subspaces). Experimental validation proves the performance of the second order sliding mode control, precisely, the super-twisting algoritm with variable gains
Haddad, Ahmad. "Modèle dynamique non linéaire de la pile à combustible du type PEM : application à la régulation de l'humidité dans la membrane électrolytique." Phd thesis, Université de Technologie de Belfort-Montbeliard, 2009. http://tel.archives-ouvertes.fr/tel-00608632.
Full textGirin, Alexis. "Contribution à la commande non linéaire d'un système électropneumatique pour une utilisation aéronautique : application sur un benchmark dédié." Phd thesis, Ecole centrale de nantes - ECN, 2007. http://tel.archives-ouvertes.fr/tel-00207714.
Full textL'étude montre que l'utilisation de commandes non linéaires permet d'obtenir les performances souhaitées. Des commandes non linéaires par modes glissants d'ordre supérieur mono et multi variables sont appliquées sur le système électropneumatique lui assurant une convergence en temps fini et la robustesse face aux incertitudes paramétriques et aux perturbations, ce qui constitue une des principales contributions de ce travail. Par ailleurs, dans le but de minimiser le nombre de capteurs et/ou pallier à leur défaillance, la synthèse d'observateurs pour cette plateforme expérimentale a été étudiée. Ainsi, une étude de l'observabilité, une synthèse d'observateurs à grands gains et par modes glissants a été effectuée.
La conclusion de ce travail permet de déterminer qu'il est possible d'utiliser des actionneurs électropneumatiques pour le positionnement d'une gouverne de missile, sous réserve de concevoir des composants intégrables. Cette thèse permet de déterminer les caractéristiques que devront avoir ces composants pour permettre d'obtenir l'ensemble des performances souhaitées.
Saddek, Lhassane. "Solutions d'un problème aux limites non linéaire discontinu à l'infini." Paris 9, 1988. https://portail.bu.dauphine.fr/fileviewer/index.php?doc=1988PA090010.
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