Добірка наукової літератури з теми "Observateur temps Fini"
Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями
Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Observateur temps Fini".
Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.
Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.
Статті в журналах з теми "Observateur temps Fini":
Bréjault, Vincent, and Franck Plestan. "Un observateur non linéaire par modes glissants à convergence en temps fini." Journal Européen des Systèmes Automatisés 45, no. 4-6 (August 30, 2011): 385–98. http://dx.doi.org/10.3166/jesa.45.385-398.
Papinot, Christian. "De quoi la longue participation est-elle la garantie dans l’enquête ethnographique ?" I- Le temps de l’enquête, no. 61 (December 12, 2017): 53–72. http://dx.doi.org/10.7202/1042368ar.
Дисертації з теми "Observateur temps Fini":
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
Bouchama, Fawzia. "Synthèse d’observateurs continus-discrets pour les systèmes non linéaires : Application au Train Autonome." Electronic Thesis or Diss., Valenciennes, Université Polytechnique Hauts-de-France, 2024. http://www.theses.fr/2024UPHF0005.
This thesis contributes to the collaborative project "Train de Fret Autonome'' led by the SNCF and aims to control autonomous freight trains in order to guarantee reliable and safe autonomous driving in all environmental conditions. In this context, our contributions concern the development of estimators for accurately reconstructing the train position and longitudinal speed under variable wheel-rail adhesion conditions. The major difficulty arises from the fact that on-board odometric sensors provide a measurement of wheel rotation at axle level, but do not directly detect the phenomenon of wheel slippage, resulting in inaccurate estimation of the longitudinal speed of the train. To overcome this problem, it is necessary to make a precise recalibration using the position of the train measured by radio beacons installed on the rail. Nevertheless, this measurement is discrete with a variable sampling period. One of the challenges is to consider train measurements that combine both continuous and aperiodically sampled measurements. Thus, the main theoretical contribution of this thesis is the design of a continuous-discrete observer for a class of multi-input/multi-output systems with continuous noisy outputs and aperiodically sampled outputs. This observer is designed to meet the specifications of the "Autonomous Freight Train" project, in order to estimate train speed under variable adhesion conditions. The performance of this observer is shown in simulation and compared with other approaches to train speed estimation, then validated experimentally via an experimental test program carried out at the Centre d'Essai Ferroviaire of Tronville-en-Barrois
Lebastard, Vincent. "La robotique à pattes : un champ d'application pour les observateurs non linéaires à convergence en temps fini." Nantes, 2007. http://www.theses.fr/2007NANT2121.
This work deals with the estimation of the absolute orientation of a biped robot evolving in the sagittal plane, by only measuring the relative variables. Four steps are necessary to resolve this problem: the observability study, the observer synthesis, the stability study and finally the experimental validation. The observability property of the absolute orientation is verified by studying the observability criterion. Using this criterion a loss of observability appears during the step. In order to avoid this singularity, two strategies have been developed: the first one consists in changing the observer into an estimator in the neighborhood of observability singularity; the second one consists in designing two structures of observers based on different observability indices, which allows that, at each time, the observer is computable. Two kinds of observers are studied: high gain observers and sliding modes observers. The first one is used in order to validate observers strategies. Second ones, with their finite time convergence and robustness properties greatly simplify the stability proof (based on Poincaré's section). Observers have been experimentally validated on RABBIT biped
Silm, Haik Jan. "Estimation distribuée et en temps fini pour les systèmes en réseau." Thesis, Centrale Lille Institut, 2020. http://www.theses.fr/2020CLIL0006.
This thesis is a broad treatment of the distributed state estimation problem for linear systems. In this setting, a network of observer nodes collectively estimates the state of a dynamical system, since individually they are not able to do so. The proposed solution consists of a distributed observer which uses diffusive coupling and leads to three complementary contributions. The first one considers exponential convergence with arbitrary rates. Various design approaches are put into a unified framework to facilitate their comparison. To characterize the feasibility of the designs, the notion of distributed observability with respect to the graph of the network is introduced, which is akin to observability in centralized state estimation. It is concluded that a more general design procedure is desirable to reduce the size of exchanged information and to account for delays. The second contribution is the design of distributed observers where the estimates reach the state of the system exactly in a finite time, in contrast to the asymptotic convergence of the preceding linear designs. Sufficient bounds on the gain parameters are obtained using the concept of homogeneity. As a third contribution, an advantage of distributed observers is demonstrated by taking into account the specific effects of communications. In a numerical example, diffusively coupled observer nodes achieve a better performance compared to the direct transmission of partial outputs
Silm, Haik Jan. "Estimation distribuée et en temps fini pour les systèmes en réseau." Thesis, Ecole centrale de Lille, 2020. http://www.theses.fr/2020ECLI0006.
This thesis is a broad treatment of the distributed state estimation problem for linear systems. In this setting, a network of observer nodes collectively estimates the state of a dynamical system, since individually they are not able to do so. The proposed solution consists of a distributed observer which uses diffusive coupling and leads to three complementary contributions. The first one considers exponential convergence with arbitrary rates. Various design approaches are put into a unified framework to facilitate their comparison. To characterize the feasibility of the designs, the notion of distributed observability with respect to the graph of the network is introduced, which is akin to observability in centralized state estimation. It is concluded that a more general design procedure is desirable to reduce the size of exchanged information and to account for delays. The second contribution is the design of distributed observers where the estimates reach the state of the system exactly in a finite time, in contrast to the asymptotic convergence of the preceding linear designs. Sufficient bounds on the gain parameters are obtained using the concept of homogeneity. As a third contribution, an advantage of distributed observers is demonstrated by taking into account the specific effects of communications. In a numerical example, diffusively coupled observer nodes achieve a better performance compared to the direct transmission of partial outputs
Menard, Tomas. "Application de l'homogénéité à la théorie des observateurs non linéaires." Phd thesis, Ecole centrale de nantes - ECN, 2011. http://tel.archives-ouvertes.fr/tel-00633713.
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
Mincarelli, Diego. "Parameters and state estimation for switched systems." Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10146.
Hybrid systems have been widely studied in the literature and became a powerful tool for modeling systems coming from many engineering fields. A common definition of hybrid systems is a combination of both continuous-time and discrete event systems. Examples of hybrid systems include networks, multi-agent systems, mechanical devices, robot path planning, biological systems. Researches on hybrid systems cover all fields of control theory such as stability analysis, control and observation problems or supervision. In the context of switched systems, which is a particular class of hybrid systems, this thesis aims at studying the problem related to extracting information about the system parameters and the state from the knowledge of the output.This study is motivated by various purposes: modeling, monitoring, fault detection and identification for the systems safety, output feedback control. For those reasons,the identification and the observation are at the core of decision and control problems.The first part of the thesis is devoted to extend the applicability of the algebra-based methods for on-line constant parameter estimation, developed by INRIA – Non-A project-team, to the case of systems with piecewise constant parameters. To this end, a procedure for the estimation of the parameters and the switching times is developed in the framework of switched systems.Such an approach enables a simultaneous algebraic estimation of both parameters and change time instants. The novelty and efficiency of the proposed identification algorithms mainly lie in their non asymptotic nature. The second part of the thesis addresses the problem of observer design for estimating the discrete and the continuous state of switched systems.Since switched systems contain a family of continuous-time systems and discrete-event systems, the evolution of their dynamics is naturally non-smooth, and this increases the difficulties to solve the observation problem. For instance, the estimates have to be provided before the next switch takes place. Thus, we propose an observer based on finite-time techniques (sliding-mode based) for the reconstruction of the continuous states and the switching signal (discrete state) in finite-time. Finally, we deal with another class of switched systems where the parameters, in each subsystem, are time-varying. For this kind of models, called switched linear parameter varying systems, we design an estimator for reconstructing the discrete state, by using parameter identification techniques
Gucik-Derigny, David. "CONTRIBUTION AU PRONOSTIC DES SYSTÈMES NON LINÉAIRES À BASE DE MODÈLES : THÉORIE ET APPLICATION." Thesis, Aix-Marseille 3, 2011. http://www.theses.fr/2011AIX30032.
This thesis is a contribution to the problem of a complex system prognosis. More precisely, it concerns the model-based prognosis approach and the thesis is divided into three main contributions. First of all, a definition of prognosis concept is proposed as a first contribution and is positionned in reference to the diagnosis and predictive diagnosis concepts. For that, a notion of temporal constraint is introduced to give all pertinence to the prediction achieved. It is also shown how prognosis is linked to the finite time reachability notion. The second contribution is dedicated to the use of finite time convergence observer for the prognosis problem. A prognosis methodology is presented for nonlinear multiple time scale systems. Then, a last contribution is introduced through the use of interval observer for the prognosis problem. A pronognosis methodology is proposed for nonlinear uncertain multiple time scale systems. To illustrate the theorical results, simulations are achieved based on a model of an electromechanical oscillator system
Zemouche, Ali. "Sur l'observation de l'état des systèmes dynamiques non linéaires." Phd thesis, Université Louis Pasteur - Strasbourg I, 2007. http://tel.archives-ouvertes.fr/tel-00353220.