Academic literature on the topic 'Modes d'ordres supérieurs'
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Journal articles on the topic "Modes d'ordres supérieurs"
Zepp, G., A. Wick, G. Ritoux, G. Fabre, and M. Billaud. "Ondes electromagnétiques de surface en géométrie cylindrique. Les modes de révolution d'ordre supérieur." Canadian Journal of Physics 63, no. 5 (May 1, 1985): 567–73. http://dx.doi.org/10.1139/p85-089.
Full textCampos, Milton. "The Progressive Construction of Communication: Toward a Model of Cognitive Networked Communication and Knowledge Communities." Canadian Journal of Communication 28, no. 3 (March 1, 2003). http://dx.doi.org/10.22230/cjc.2003v28n3a1373.
Full textDissertations / Theses on the topic "Modes d'ordres supérieurs"
Obeid, Hussein. "Contribution à la commande et à l'observation adaptatives par modes glissants d'ordres supérieurs : Application aux systèmes de gestion de l'énergie." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCA023/document.
Full textThis thesis deals with the development of novel strategies to adapt higher order sliding mode controllers and observers. The implementation of classics first order and higher order sliding mode controllers requires the knowledge of the upper bound of the disturbance or its derivative, which are often not known. The first contribution of this thesis is the design of an adaptive strategy that can ensure the convergence of the sliding variable to a predefined neighborhood of zero without requiring any information of the disturbance or its derivative and without overestimating the adaptive gain. This adaptive strategy is then declined for the design of the first order, second order and integral sliding mode controllers, and for the Levant's differentiator. The second contribution of the thesis is the development of two adaptive strategies for discontinuous higher order sliding mode control. The proposed two algorithms can provide the achievement of n-order sliding mode despite disturbances with unknown upper bounds or with unknown upper bounds of their derivatives. Finally, in order to show the effectiveness of the proposed algorithms, they are successfully applied through simulations to control the wind energy conversion system and the linear induction motor system for cogeneration
Guillotin, Nicolas. "Normal conducting radio frequency cavity with strongly damped higher order modes for the ESRF." Paris 11, 2009. http://www.theses.fr/2009PA112026.
Full textAt the ESRF, longitudinal coupled bunch instabilities (LCBI) driven by higher order modes (HOM) are avoided up to the nominal beam current of 200 mA by precisely controlling the radio frequency cavity temperatures. A maximum of 300 mA was recently stored in the storage ring with a new longitudinal bunch-by-bunch feedback. The aim of this thesis was to design a strongly damped 352 MHz single-cell normal conducting cavity to eventually reach at term a 500 mA stored current without feedback system. The study was based on a cavity developed at BESSY for 500 MHz with three identical homogeneous double ridge waveguides (DRWG) loaded by ferrite blocks to damp the HOM. A first aluminium low power prototype scaled from this cavity was optimized at the ESRF by means of electromagnetic simulations. The longitudinal and transverse HOM impedances measured in the prototype matched generally well the computed values except for some modes. This first iteration yielded just enough HOM damping to suppress all LCBI up to 500 mA of stored beam with eighteen such cavities in the ring. However, the required 1. 4 m long HOM dampers would not fit in the existing tunnel. The dampers were then completely reworked by simulations leading to an innovative solution, including a short quadruple ridge waveguide and two DRWG with reduced size, which should significantly lower the HOM impedances. As an alternative to HOM damping, temperature tuning of HOM applied to a scaling of the 500 MHz ELETTRA single-cell cavity was also investigated numerically
Floquet, Thierry. "Contributions à la commande par modes glissants d'ordre supérieur." Lille 1, 2000. http://www.theses.fr/2000LIL10191.
Full textUne premiere serie de resultats traite de la stabilisation par modes glissants pour des systemes perturbes mis sous forme reguliere, sous forme chainee ou sous la forme reguliere de commandabilite generalisee de fliess. Ce dernier cas est en outre l'occasion de discuter, dans le cadre des systemes non lineaires, des problemes de stabilite lorsque la commande est basee sur un observateur. Le dernier chapitre consiste en la validation experimentale d'une commande par modes glissants d'ordre superieur : les experiences ont ete effectuees sur une plate-forme dediee a la machine asynchrone et qui se situe dans les locaux de l'irccyn a nantes
Laghrouche, Salah. "Commande par modes glissants d'ordre supérieur : théorie et applications." Nantes, 2004. http://www.theses.fr/2004NANT2115.
Full textBregeault, Vincent. "Quelques contributions à la théorie de la commande par modes glissants." Phd thesis, Ecole centrale de nantes - ECN, 2010. http://tel.archives-ouvertes.fr/tel-00560746.
Full textVigot, Alexis. "Représentation stochastique d'équations aux dérivées partielles d'ordre supérieur à 3 issues des neurosciences." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066484.
Full textThis Thesis consists of two parts. In the mathematical part we study Korteweg--de Vries (KdV) equation and high-order pdes with a probabilistic point of view in order to obtain Feynman-Kac (FK) type formulas. This study was motivated by recent biological models. We prove a FK representation for a larger class of solutions of KdV equation (not only n-solitons), using Fredholm determinants and Laplace transforms of iterated Skorohod integrals. Regarding higher order pdes, iterated processes that consist in the composition of two independent processes, one corresponding to position and the other one to time, are naturally related to their solutions. Indeed, we prove FK formulas for solutions of high order pdes based on functionals of iterated processes even in the non Markovian case, thus extending the existing results. We also propose a scheme for the simulation of iterated diffusions trajectories based on Euler scheme, that converges a.s., uniformly in time, with a rate of convergence of order $1/4$. An estimation of the error is proposed. In the biological part, we have collected several papers in neuroscience and other fields of biology where the previous types of pdes are involved. In particular, we are interested in the simulation of the propagation of the action potential when the capacitance of the cell membrane is not assumed to be constant. These papers have in common the fact that they question the famous Hodgkin Huxley model dating back to the fifties. Indeed this model even if it has been very efficient for the understanding of neuronal signaling does not take into account all the phenomena that occur during the propagation of the action potential
Harmouche, Mohamed. "Contribution à la théorie de la commande par modes glissants d'ordre supérieur et à la commande des systèmes mécaniques sous-actionnés." Thesis, Belfort-Montbéliard, 2013. http://www.theses.fr/2013BELF0214/document.
Full textNonlinear systems are so diverse that generalized tools for control are difficult to develop. Nonlinear control theory requires rigorous mathematical analysis to justify its conclusions. This thesis addresses two distinct, yet important branches of nonlinear control theory: control of uncertain nonlinear systems and control of under-actuated systems.In the first part, a class of Lyapunov-based robust arbitrary higher order sliding mode (HOSM) controllers is developed for the control of uncertain nonlinear systems. This class of controllers is based on a class of controllers for finite-time stabilization of pure integrator chain, and requires the limits of the system uncertainty to be known a-priori. Then, in order to eliminate the dependence on the knowledge of these limits, an adaptive arbitrary HOSM controller is developed. Using this new class, a universal homogeneous arbitrary HOSM controller is developed and it is shown that the homogeneity degree can be manipulated to obtain additional advantages in the proposed controllers, such as bounded control, minimum amplitude of discontinuous control and fixed time convergence. The performance of the controllers has been demonstrated through simulations and experiments on a fuel cell system.In the next part, the control of two under-actuated systems is studied. The first control problem is the global path following of car-type robotic vehicle, using target-point. The second problem is the precise tracking of surface marine vessels. Both these problems are distinct in nature; however, they are subjected to similar physical constraints. The solutions proposed for these control problems use saturated controls, taking into account the physical bounds on the control inputs. Simulations have been performed to demonstrate the performance of these controllers
Beltran, Brice. "Contribution à la Commande Robuste des Eoliennes à Base de Génératrices Asynchrones Double Alimentation : Du Mode Glissant Classique au Mode Glissant d'Ordre Supérieur." Phd thesis, Université de Bretagne occidentale - Brest, 2010. http://tel.archives-ouvertes.fr/tel-00598805.
Full textGranata, Massimo. "Développements optiques pour les détecteurs d'ondes gravitationnelles de deuxième et troisième génération: cavités de recyclage pour Advanced Virgo et modes de Laguerre-Gauss d'ordre supérieur." Phd thesis, Université Paris-Diderot - Paris VII, 2011. http://tel.archives-ouvertes.fr/tel-00665858.
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.