### Résultat de la recherche

**1 résultat(s) recherche sur le tag 'Synchronisation hybride' **

Affiner la recherche Générer le flux rss de la recherche
Partager le résultat de cette recherche Interroger des sources externes

Contribution à l’implémentation de nouvelles approches de synchronisation hybride des systèmes chaotiques à paramètres incertains. / Zakaria Driss

Titre : Contribution à l’implémentation de nouvelles approches de synchronisation hybride des systèmes chaotiques à paramètres incertains. Type de document : texte imprimé Auteurs : Zakaria Driss, Auteur ; Noura Mansouri, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2017 Importance : 129 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles

Langues : Français ( fre)Catégories : Français - Anglais

ElectroniqueTags : systèmes chaotiques synchronisation Synchronisation hybride GPC Automatique Traitement du signal Index. décimale : 621 Electronique Résumé : The aim of the thesis is to consider the performance of some control methods towards the

problem of hybrid synchronization of uncertain chaotic systems. These systems are

interesting due to the sensitive dependence on initial conditions or what is called the butterfly

effect; this feature makes chaotic systems exhibit random behavior. Therefore, the

synchronization of chaotic systems with uncertain parameters is an attractive problem,

especially in the field of secure communication, that has been intensively studied in the last

two decades. The problem of uncertainties on the parameters, in the field of nonlinear control

systems, has been solved especially when advanced control methods are used. However, the

effect of synchronization of two chaotic systems with uncertain parameters and hybrid

synchronization type on some advanced control method is still questionable. The thesis is

composed of three main points, each of them dealing with the studied problem from a

different aspect.

In the first point, we considered the performance of adaptive synchronization in which selftuning adaptive control and active control method are used. This approach has been used

intensively to solve the studied problem, but many problems have been reported, and one of

the problems is the wrong estimation of the unknown parameters. This problem occurs when

two identical or partially identical chaotic systems are synchronized in which the

synchronization prevents the adaptation laws to estimate the true values of the unknown

parameters. This problem is considered in chapter 2 of the thesis in which we explained the

problem, gave the proposed solutions, and the contribution.

In the second point, predictive control, particularly generalized predictive control (GPC), has

been considered. This approach is sort of complex control method in which the accuracy of

the model plays a vital role during the control process. Therefore, we examined, in chapter 3,

the performance of GPC towards the studied problem. This chapter consists of two parts. Part

one focuses on GPC based on fuzzy PID controllers in which we discussed the roll of the

linear model. Part two investigates the performance of GPC based on a neural network model

(NNGPC).

In the first point and the second point, the synchronization type used is complete

synchronization. Therefore, in the third point (chapter 4), we addressed the problem of

hybrid synchronization of uncertain chaotic systems in which we investigated the

performance of the studied control methods.

In general, the effect of synchronization or hybrid synchronization of uncertain chaotic

systems on some advanced control methods is partial. The field of chaos synchronization

using feedback control is an independent field of research, but the performance of studied

methods may not be satisfying when the field of secure communication is involved.Diplôme : Doctorat En ligne : ../theses/electronique/DRI7102.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10499 Contribution à l’implémentation de nouvelles approches de synchronisation hybride des systèmes chaotiques à paramètres incertains. [texte imprimé] / Zakaria Driss, Auteur ; Noura Mansouri, Directeur de thèse . - [S.l.] : جامعة الإخوة منتوري قسنطينة, 2017 . - 129 f. ; 30 cm.

2 copies imprimées disponibles

Langues : Français (fre)

Catégories : Français - Anglais

ElectroniqueTags : systèmes chaotiques synchronisation Synchronisation hybride GPC Automatique Traitement du signal Index. décimale : 621 Electronique Résumé : The aim of the thesis is to consider the performance of some control methods towards the

problem of hybrid synchronization of uncertain chaotic systems. These systems are

interesting due to the sensitive dependence on initial conditions or what is called the butterfly

effect; this feature makes chaotic systems exhibit random behavior. Therefore, the

synchronization of chaotic systems with uncertain parameters is an attractive problem,

especially in the field of secure communication, that has been intensively studied in the last

two decades. The problem of uncertainties on the parameters, in the field of nonlinear control

systems, has been solved especially when advanced control methods are used. However, the

effect of synchronization of two chaotic systems with uncertain parameters and hybrid

synchronization type on some advanced control method is still questionable. The thesis is

composed of three main points, each of them dealing with the studied problem from a

different aspect.

In the first point, we considered the performance of adaptive synchronization in which selftuning adaptive control and active control method are used. This approach has been used

intensively to solve the studied problem, but many problems have been reported, and one of

the problems is the wrong estimation of the unknown parameters. This problem occurs when

two identical or partially identical chaotic systems are synchronized in which the

synchronization prevents the adaptation laws to estimate the true values of the unknown

parameters. This problem is considered in chapter 2 of the thesis in which we explained the

problem, gave the proposed solutions, and the contribution.

In the second point, predictive control, particularly generalized predictive control (GPC), has

been considered. This approach is sort of complex control method in which the accuracy of

the model plays a vital role during the control process. Therefore, we examined, in chapter 3,

the performance of GPC towards the studied problem. This chapter consists of two parts. Part

one focuses on GPC based on fuzzy PID controllers in which we discussed the roll of the

linear model. Part two investigates the performance of GPC based on a neural network model

(NNGPC).

In the first point and the second point, the synchronization type used is complete

synchronization. Therefore, in the third point (chapter 4), we addressed the problem of

hybrid synchronization of uncertain chaotic systems in which we investigated the

performance of the studied control methods.

In general, the effect of synchronization or hybrid synchronization of uncertain chaotic

systems on some advanced control methods is partial. The field of chaos synchronization

using feedback control is an independent field of research, but the performance of studied

methods may not be satisfying when the field of secure communication is involved.Diplôme : Doctorat En ligne : ../theses/electronique/DRI7102.pdf Format de la ressource électronique : Permalink : https://bu.umc.edu.dz/md/index.php?lvl=notice_display&id=10499 ## Exemplaires (1)

Code-barres Cote Support Localisation Section Disponibilité DRI/7102 DRI/7102 Thèse Bibliothèque principale Thèses Disponible