Letteratura scientifica selezionata sul tema "Systèmes LTI avec retards"
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Articoli di riviste sul tema "Systèmes LTI avec retards":
Filter, Christophe, Laurentiu Hetel, Wilfrid Perruquetti e Jean-Pierre Richard. "Echantillonnage dépendant de l’état pour les systèmes avec perturbations et retards". Journal Européen des Systèmes Automatisés 45, n. 1-3 (30 aprile 2011): 189–203. http://dx.doi.org/10.3166/jesa.45.189-203.
Carnahan, Emily, Austin Van Grack, Brian Kangethe, Mamadou Mballo Diallo, Dominic Mutai, Oury Bah, Hassan Mtenga et al. "Root causes of COVID-19 data backlogs: a mixed methods analysis in four African countries". Oxford Open Digital Health 2, S1 (2024): i16—i28. http://dx.doi.org/10.1093/oodh/oqae009.
Leppänen, Anneli. "Improving the Mastery of Work and the Development of the Work Process in Paper Production". Relations industrielles 56, n. 3 (22 ottobre 2002): 579–609. http://dx.doi.org/10.7202/000083ar.
FOSTIER, Alexis. "Évolution de la place de l’animal et des points de vue sur son élevage dans la société française : quels enjeux pour la recherche agronomique ?" INRA Productions Animales, 10 aprile 2019, 221–32. http://dx.doi.org/10.20870/productions-animales.2019.32.2.2465.
Gaspar, Thomas, Claude Penel e Hubert Greppin. "Approche analogique et réalités des phytohormones : des retards et des erreurs stratégiques?" Bulletin de la Société Royale des Sciences de Liège, 2016, 190–208. http://dx.doi.org/10.25518/0037-9565.6236.
Zagamé, Antonia. "Lire pour la première fois. La découverte de la littérature dans quelques fictions pédagogiques de la deuxième moitié du XVIIIe siècle (Rousseau, Madame de Genlis)". Le Monde français du dix-huitième siècle 3, n. 1 (9 luglio 2018). http://dx.doi.org/10.5206/mfds-ecfw.v3i1.4377.
Maes, Marjan. "Numéro 79 - mai 2010". Regards économiques, 12 ottobre 2018. http://dx.doi.org/10.14428/regardseco.v1i0.15363.
Maes, Marjan. "Numéro 79 - mai 2010". Regards économiques, 12 ottobre 2018. http://dx.doi.org/10.14428/regardseco2010.05.01.
Tesi sul tema "Systèmes LTI avec retards":
Zekraoui, Salim. "Contrôle et estimation en temps fini de certaines classes d'EDP". Electronic Thesis or Diss., Centrale Lille Institut, 2023. http://www.theses.fr/2023CLIL0028.
This Ph.D. thesis is devoted to the problems of non-asymptotic (finite, fixed, prescribed-time) estimation and stabilization of some classes of infinite-dimensional systems, namely LTI systems subject to input/sensor (pointwise or distributed) delays and reaction-diffusion PDEs. As the existing results on these classes of systems are few, we begin by reviewing relevant concepts and results on non-asymptotic tools (including homogeneity-based tools and time-varying tools) for finite-dimensional systems. Afterward, we extend these tools to infinite-dimensional settings. Firstly, we start with the problem of input and sensor delay compensation in finite/fixed/prescribed time of LTI systems where we use the so-called backstepping approach for PDEs (with some nonlinear and/or time-varying invertible transformations). To apply this approach, we reformulate the considered LTI system into a cascade ODE-PDE system where the PDE part is a hyperbolic transport equation that models the effect of the delay on the input/output. Secondly, we consider the problem of boundary state-dependent finite/fixed-time stabilization of reaction-diffusion PDEs. To the best of our knowledge, this problem has remained open in the literature for a considerable long time. We tackle this challenging problem using classical methods related to Control Lyapunov functions. We provide some hints on how we to extend this approach to input-to-state stabilization and non-asymptotic tracking problem for reaction-diffusion PDEs. We point out the limitations of our approach to observer design. Finally, we tackle the problem of input delay compensation of reaction-diffusion systems in prescribed time by output feedback using the backstepping approach. This problem is challenging, as one deals with observer and control designs with some time-varying gains that go to infinity when the time gets closer to the prescribed time of convergence, which brings additional challenges and issues. Dealing with these challenges requires introducing novel infinite-dimensional time-varying backstepping transformations in conjunction with advanced predictor-based concepts adapted to parabolic PDEs
Mattioni, Mattia. "Stabilisation des systèmes échantillonnés en cascade et avec retards". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS118/document.
Over the last decades the methodologies of dynamical systems and control theory have been playing an increasingly relevant role in a lot of situations of practical interest. Though, a lot of theoretical problem still remain unsolved. Among all, the ones concerning stability and stabilization are of paramount importance. In order to stabilize a physical (or not) system, it is necessary to acquire and interpret heterogeneous information on its behavior in order to correctly intervene on it. In general, those information are not available through a continuous flow but are provided in a synchronous or asynchronous way. This issue has to be unavoidably taken into account for the design of the control action. In a very natural way, all those heterogeneities define an hybrid system characterized by both continuous and discrete dynamics. This thesis is contextualized in this framework and aimed at proposing new methodologies for the stabilization of sampled-data nonlinear systems with focus toward the stabilization of cascade dynamics. In doing so, we shall propose a small number of tools for constructing sampled-data feedback laws stabilizing the origin of sampled-data nonlinear systems admitting cascade interconnection representations. To this end, we shall investigate on the effect of sampling on the properties of the continuous-time system while enhancing design procedures requiring no extra assumptions over the sampled-data equivalent model.Finally, we shall show the way sampling positively affects nonlinear retarded dynamics affected by a fixed and known time-delay over the input signal by enforcing on the implicit cascade representation the sampling process induces onto the retarded system. Academic examples will illustrate the computational aspects together with their performances throughout the whole manuscript
Diab, Ali. "Stability analysis and control design for time-delay systems with applications to automotive steering systems". Electronic Thesis or Diss., université Paris-Saclay, 2023. http://www.theses.fr/2023UPAST057.
Steering assistance helps the driver to maneuver the vehicle by reducing the steering effort. In the case of electric power steering and steer-by-wire, the assistance system is composed of electrical drives placed at the rack pinion (allowing the wheels to move) and at the steering wheel (providing the driver a feeling of the forces acting on the wheels). These architectures introduce, however, delays in the feedback loops of the system. To ensure its stability in the presence of delays, one can reduce the assist gain or increase the damping of the steering wheel, but this negatively impacts the system's performance and degrades the force feedback returned to the driver. In order to counter this limitation, we design and analyze control laws for steering systems that increase (compared to current strategies) the delay margin of the system. We use a frequency-domain approach to analyze the constraints imposed by the stability of the feedback system generating the steering wheel torque. Our algorithms rely on classical proportional-derivative control architectures, including torque maps and filters. The simplicity of the proposed methods allows an analytical computation of the delay margin. In addition, to make our results more general (for example, for nonlinear torque maps), we develop time-domain techniques to analyze the stability of linear time-delay systems using Lyapunov-Krasovskii functionals. We formulate a projection-based method allowing general sets of functions to parameterize Lyapunov-Krasovskii functionals. We discuss the main assumptions considered in our formulation and establish connections between the existing approaches for the stability analysis of time-delay systems based on semidefinite programming, namely the method based on the use of integral inequalities and the method based on sum-of-squares programming. Finally, the obtained results are also applied to the test case of steering systems
Estrada, Garcia Hector Javier. "Commande de systèmes mécaniques avec retards dans la transmission de données". Nantes, 2008. http://www.theses.fr/2008NANT2063.
In this thesis, the development of a synchronization technique is investigated, for dynamic systems with delays in the communication channel. It is assumed that the delays may be large but bounded. The study of the problem of synchronization of two distant mechanical devices (one being in Nantes, France; the other in Ensenada, Mexico), interconnected through a network. The mechanical system is underactuated and consists in an inverted pendulum linked to a transversal beam through a prismatic joint. The contributions of this thesis generalize the available synchronization results in the current literature
Langueh, Kokou Anani Agbessi. "Estimation en temps fini de systèmes non linéaires et à retards avec application aux systèmes en réseau". Thesis, Ecole centrale de Lille, 2018. http://www.theses.fr/2018ECLI0012/document.
This thesis investigates the topology identification problem for network of dynamical complex systems, whose subsystems are described by ordinary differential equations (ODE) and/or delay differential equations (DDE). The first part of this work focuses on the parameters identification of the network of linear systems. Thus, different classes of linear systems have been treated namely systems without delay, systems with commensurable delay and systems with unknown inputs. An impulsive observer is proposed in order to identify both the states and the unknown parameters of the considered class of dynamic system in finite time. In order to guarantee the existence of the proposed impulsive observer, sufficient conditions are deduced. An illustrative example is given in order to show the efficiency of the proposed finite-time observer.The second part of this work treats the topology identification of the network of nonlinear dynamic systems. In our considerations, the topology connections are represented as constant parameters, therefore the topology identification is equivalent to identify the unknown parameters. A sufficient condition on parameter identifiability is firstly deduced, and then a uniform differentiator with finite-time convergence is proposed to estimate the unknown parameters
Yakoubi, Karim. "Stabilisation des systèmes linéaires avec commande bornée et retardée". Paris 11, 2005. http://www.theses.fr/2005PA112293.
In this thesis, we study two problems on stabilization of linear systems by static feedbacks which are bounded and time-delayed, namely global asymptotic stabilization and finite-gain stabilizability. Both continuous-time and discrete-time systems are considered. Regarding the problem of global asymptotic stabilization we provide, under standard necessary conditions, two different solutions for arbitrary small bound on the control and large (constant) delay. The first solution uses nested saturations, in the line of [MMN1], [MMN2], [SSY] and [YSS]. The second solution, a sort of "predictor-corrector", assumes the knowledge of a static stabilizing feedback law in the zero-delay case. For the finite-gain stabilizability issue, we assume that the system is neutrally stable. We show the existence of a linear feedback such that, for arbitrary small bound on the control and large (constant) delay, finite-gain stability holds. Moreover, the corresponding gains are delay-independent for all [dollar]p \in [1,\infty]. [dollar] Generally speaking, our treatment of the aforementioned issues on time-delay systems follows a common pattern. We always try to reformulate them as problems for perturbed delay-free systems and handle the perturbation by Lyapunov techniques or by a careful trajectory analysis. That strategy works well because the input saturation makes the perturbation uniformly bounded with respect to the delay
Andrianiaina, Patrick. "Commande robuste avec relâchement des contraintes temps-réel". Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00870437.
Witrant, Emmanuel. "Stabilisation des systèmes commandés par réseaux". Phd thesis, Grenoble INPG, 2005. http://tel.archives-ouvertes.fr/tel-00011606.
Cette analyse de robustesse permet de prendre en compte les caractéristiques non déterministes du réseau. Nous proposons finalement une loi de commande basée sur un observateur pour le cas où seule la sortie est mesurable et considérons aussi le
cas de poursuite de trajectoire. Des simulations et résultats expérimentaux sont proposés.
Scorletti, 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.
Lauber, Jimmy. "Moteur à allumage commandé avec EGR : modélisation et commande non linéaires". Phd thesis, Université de Valenciennes et du Hainaut-Cambresis, 2003. http://tel.archives-ouvertes.fr/tel-00008046.