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Titre : Dynamique de l’interaction sol structure par la méthode des éléments spectraux. Type de document : texte imprimé Auteurs : Souad Boudaa, Auteur ; Salah Khalfallah, Directeur de thèse Mention d'édition : 20/01/2021 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2021 Importance : 100 f. Format : 30 cm. Note générale : 1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie CivilTags : Génie civil :structure Interaction sol-poutre statique Sols multicouches Modèle de la fondation élastique à deux paramètres Méthode des éléments finis Fondation élastique Couche de ballast Propriétés du sol Vibrations libres Méthode des éléments spectraux Analyse dynamique Interaction sol-structure Static soil-beam interaction Multi-layered soils Model of the elastic foundation with two parameters Finite
element method Elastic foundation Ballast layer Soil properties Free vibrations Spectral element method Dynamic analysis Soil-structure interaction تفاعل تربة-رافدة ساكن التربة المتعددة الطبقات نموذج الأساس المرن ذو المعلمتين طريقة العناصر المنتهية الأساس المرن طبقة الصابورة خصائص التربة الاهتزازات الحرة طريقة العناصر الطيفية التحليل الديناميكي تفاعل تربة-هيكلIndex. décimale : 624 Génie civil Résumé :
This work consists of the simulation of the behavior of the soil-structure interaction, using the spectral element method (SEM). First, we analyzed the static interaction between a beam and a stratified soil using a two-parameter elastic foundation with the finite element method. The behavior of the ground medium and of the beam is supposed to be linear, homogeneous and isotropic. Using the strain energy expressions, the shear strains of the beam element and the subgrade are taken into account. In this approach, the stiffness matrix of each component is developed and integrated into the finite element analysis. Several examples are treated to show the effectiveness of the proposed approach and the capacity of the digital program developed. Then, a parametric study is carried out to highlight the influence of the mechanical properties of the soil on the soil-beam contact interface and on the responses of the beam, the effect of the depth of the soil, of the ballast layer on the response of the interface and of the beam itself. Second, we made an analysis of the soil-structure interaction by the spectral element method. We used the Finite Element Method (FEM) too, but only to prove the robustness of the SEM. The numerical results show that the convergence of the SEM is very fast compared to that of the FEM. The resolution of the problem with the eigenvalues is made, the natural frequencies are tabulated for the first three modes of vibration. A modal analysis with and without elastic medium is realised. We established a parametric study to investigate the behavior of the concrete beam on an elastic foundation, the effect of the length of the beam, the effect of soil properties and the influence of non-classical boundary conditions. Finally, we have shown that the dynamic response of the beam on an elastic foundation is highly affected by the contribution of rotational springs.
Various results are obtained and commented.
Diplôme : Doctorat en sciences En ligne : ../theses/gcivil/BOU7722.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11556 Dynamique de l’interaction sol structure par la méthode des éléments spectraux. [texte imprimé] / Souad Boudaa, Auteur ; Salah Khalfallah, Directeur de thèse . - 20/01/2021 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 100 f. ; 30 cm.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie CivilTags : Génie civil :structure Interaction sol-poutre statique Sols multicouches Modèle de la fondation élastique à deux paramètres Méthode des éléments finis Fondation élastique Couche de ballast Propriétés du sol Vibrations libres Méthode des éléments spectraux Analyse dynamique Interaction sol-structure Static soil-beam interaction Multi-layered soils Model of the elastic foundation with two parameters Finite
element method Elastic foundation Ballast layer Soil properties Free vibrations Spectral element method Dynamic analysis Soil-structure interaction تفاعل تربة-رافدة ساكن التربة المتعددة الطبقات نموذج الأساس المرن ذو المعلمتين طريقة العناصر المنتهية الأساس المرن طبقة الصابورة خصائص التربة الاهتزازات الحرة طريقة العناصر الطيفية التحليل الديناميكي تفاعل تربة-هيكلIndex. décimale : 624 Génie civil Résumé :
This work consists of the simulation of the behavior of the soil-structure interaction, using the spectral element method (SEM). First, we analyzed the static interaction between a beam and a stratified soil using a two-parameter elastic foundation with the finite element method. The behavior of the ground medium and of the beam is supposed to be linear, homogeneous and isotropic. Using the strain energy expressions, the shear strains of the beam element and the subgrade are taken into account. In this approach, the stiffness matrix of each component is developed and integrated into the finite element analysis. Several examples are treated to show the effectiveness of the proposed approach and the capacity of the digital program developed. Then, a parametric study is carried out to highlight the influence of the mechanical properties of the soil on the soil-beam contact interface and on the responses of the beam, the effect of the depth of the soil, of the ballast layer on the response of the interface and of the beam itself. Second, we made an analysis of the soil-structure interaction by the spectral element method. We used the Finite Element Method (FEM) too, but only to prove the robustness of the SEM. The numerical results show that the convergence of the SEM is very fast compared to that of the FEM. The resolution of the problem with the eigenvalues is made, the natural frequencies are tabulated for the first three modes of vibration. A modal analysis with and without elastic medium is realised. We established a parametric study to investigate the behavior of the concrete beam on an elastic foundation, the effect of the length of the beam, the effect of soil properties and the influence of non-classical boundary conditions. Finally, we have shown that the dynamic response of the beam on an elastic foundation is highly affected by the contribution of rotational springs.
Various results are obtained and commented.
Diplôme : Doctorat en sciences En ligne : ../theses/gcivil/BOU7722.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11556 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/7722 BOU/7722 Thèse Bibliothèque principale Thèses Disponible Modelisation et optimisation d'une machine a reluctance variable par algorithmes intelligents / Sihem Mouellef
Titre : Modelisation et optimisation d'une machine a reluctance variable par algorithmes intelligents Type de document : texte imprimé Auteurs : Sihem Mouellef, Auteur ; Ammar Bentounsi, Directeur de thèse ; Hocine Benalla, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2016 Importance : 143 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Electro-techniqueTags : Variable reluctance machine Analytical modeling Finites elements method hybride modeling Optimization metaheuristics Genetic algorithm particle swarm
optimization Machine à réluctance variable Modèles analytiques Méthode des éléments finis Modélisation hybride Optimisation méta-heuristiques Algorithme génétique Optimisation
par essaim particulaireIndex. décimale : 622 Electro-Technique Résumé : The theme dealt with in this thesis focuses on the modeling of a variable reluctance
motor (VRM) adapted to the process of optimizing its performance we have developed and
tested. Knowing that the performance of VRM depends as well on the geometric structure, the
nonlinear characteristics of the materials used and the converter control parameters, we
therefore paid particular attention to the associated mathematical model, based on an
analytical approach taking into account the peculiarity of the VRM run in saturated state.
Despite the accuracy of numerical approaches such as finite element method,
researchers are moving increasingly towards hybrid methods combining their analytical
models as better suited to an optimization process; this is the approach we have adopted here.
Thus we have oriented our work towards finding hybrid models (analytical- numerical)
sufficiently accurate while being rapid execution. The validation of these models was made
by comparing the results obtained and the numerical simulations by finite elements in Flux-
2D.
Validation and exploitation of results of different simulations allowed the continuation
of work to optimize the geometric parameters for stator and rotor teeth of the studied
prototype. After state of the art different algorithms of optimizations present in the literature,
our choice fell on Genetic Algorithms and Swarm particles. The various simulations in
MATLAB environment allowed get optimized dental angles and significantly improve the
average couple.
Diplôme : Doctorat en sciences En ligne : ../theses/electrotec/MOU7020.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10574 Modelisation et optimisation d'une machine a reluctance variable par algorithmes intelligents [texte imprimé] / Sihem Mouellef, Auteur ; Ammar Bentounsi, Directeur de thèse ; Hocine Benalla, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2016 . - 143 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Electro-techniqueTags : Variable reluctance machine Analytical modeling Finites elements method hybride modeling Optimization metaheuristics Genetic algorithm particle swarm
optimization Machine à réluctance variable Modèles analytiques Méthode des éléments finis Modélisation hybride Optimisation méta-heuristiques Algorithme génétique Optimisation
par essaim particulaireIndex. décimale : 622 Electro-Technique Résumé : The theme dealt with in this thesis focuses on the modeling of a variable reluctance
motor (VRM) adapted to the process of optimizing its performance we have developed and
tested. Knowing that the performance of VRM depends as well on the geometric structure, the
nonlinear characteristics of the materials used and the converter control parameters, we
therefore paid particular attention to the associated mathematical model, based on an
analytical approach taking into account the peculiarity of the VRM run in saturated state.
Despite the accuracy of numerical approaches such as finite element method,
researchers are moving increasingly towards hybrid methods combining their analytical
models as better suited to an optimization process; this is the approach we have adopted here.
Thus we have oriented our work towards finding hybrid models (analytical- numerical)
sufficiently accurate while being rapid execution. The validation of these models was made
by comparing the results obtained and the numerical simulations by finite elements in Flux-
2D.
Validation and exploitation of results of different simulations allowed the continuation
of work to optimize the geometric parameters for stator and rotor teeth of the studied
prototype. After state of the art different algorithms of optimizations present in the literature,
our choice fell on Genetic Algorithms and Swarm particles. The various simulations in
MATLAB environment allowed get optimized dental angles and significantly improve the
average couple.
Diplôme : Doctorat en sciences En ligne : ../theses/electrotec/MOU7020.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10574 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité MOU/7020 MOU/7020 Thèse Bibliothèque principale Thèses Disponible
Titre : Amélioration du rendement des cellules solaires organiques à base de polymères conjugués. Type de document : texte imprimé Auteurs : Fathi Brioua, Auteur ; Mohamed Remram, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 95 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
ElectroniqueTags : Cellule solaire organique P3HT:PCBM semi-conducteurs inorganique coefficient
d'absorption taux de génération méthode des éléments finis Organic solar cell P3HT: PCBM inorganic semiconductors absorption coefficient generation rate finite element method الخلایا الشمسیة العضویة أشباه الموصلات غیر العضویة معامل الامتصاص معدل التولید طریقة
العناصر المحدودة .P3HT:PCBIndex. décimale : 621 Electronique Résumé : Research on organic solar cells based on semiconductors has a great interest, because this type of cells has very interesting properties, particularly in their flexibility, and the possibility of being made with large areas, compared to inorganic solar cells.In this contribution, we are interested to study the effect of the structure geometry of these cells, precisely the influence of the active layer thickness on the efficiency of these cells which is based on the use of interpenetrating network materials (P3HT: PCBM) of bulk-heterojunction solar cells. In a first phase, the electrical characteristics can be calculated and explored by a optical study consecrated to explore the optical properties of these cells such as the absorption coefficient and the generation rate that govern the absorption properties of the solar cell and based on the latter coefficients in conjunction of the experimental data, we calculated the charge carriers motilities into the active layer. In the second phase, we made another study on the effect of the electric charges recombination into the active layer (P3HT:PCBM) in order to know the probability of the carriers of the charges recombination in vicinity of the donor / acceptor interface for each studied micro device, everything was done by the solar cell simulator (Comsol Multiphysics) that based on the finite element method. The final phase is consecrated for the comparison of our new obtained results with both numerical and experimental approaches provided by the literature in order to validate our proposed approach.
Diplôme : Doctorat Permalink : index.php?lvl=notice_display&id=10992 Amélioration du rendement des cellules solaires organiques à base de polymères conjugués. [texte imprimé] / Fathi Brioua, Auteur ; Mohamed Remram, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 95 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
ElectroniqueTags : Cellule solaire organique P3HT:PCBM semi-conducteurs inorganique coefficient
d'absorption taux de génération méthode des éléments finis Organic solar cell P3HT: PCBM inorganic semiconductors absorption coefficient generation rate finite element method الخلایا الشمسیة العضویة أشباه الموصلات غیر العضویة معامل الامتصاص معدل التولید طریقة
العناصر المحدودة .P3HT:PCBIndex. décimale : 621 Electronique Résumé : Research on organic solar cells based on semiconductors has a great interest, because this type of cells has very interesting properties, particularly in their flexibility, and the possibility of being made with large areas, compared to inorganic solar cells.In this contribution, we are interested to study the effect of the structure geometry of these cells, precisely the influence of the active layer thickness on the efficiency of these cells which is based on the use of interpenetrating network materials (P3HT: PCBM) of bulk-heterojunction solar cells. In a first phase, the electrical characteristics can be calculated and explored by a optical study consecrated to explore the optical properties of these cells such as the absorption coefficient and the generation rate that govern the absorption properties of the solar cell and based on the latter coefficients in conjunction of the experimental data, we calculated the charge carriers motilities into the active layer. In the second phase, we made another study on the effect of the electric charges recombination into the active layer (P3HT:PCBM) in order to know the probability of the carriers of the charges recombination in vicinity of the donor / acceptor interface for each studied micro device, everything was done by the solar cell simulator (Comsol Multiphysics) that based on the finite element method. The final phase is consecrated for the comparison of our new obtained results with both numerical and experimental approaches provided by the literature in order to validate our proposed approach.
Diplôme : Doctorat Permalink : index.php?lvl=notice_display&id=10992 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BRI/7342 BRI/7342 Thèse Bibliothèque principale Thèses Disponible
Titre : Dimensionnement, modélisation et optimisation de machines à réluctance variable : Applications en Moteur/Générateur. Type de document : texte imprimé Auteurs : Tariq Benamimour, Auteur ; Ammar Bentounsi, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 153 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Electro-techniqueTags : Machine à Reluctance Variable Méthode des Eléments Finis moteur générateur caractéristiques
magnétiques éolienne à attaque directe couplage FEMM-MATLAB Switched Reluctance Machine Finite Element Analysis motor generator magnetic characteristics direct attack wind turbine coupling MATLAB to FEMM ماكينة ذات ممانعة متغيرة طريقة العناصر المنتهية محرك مولد الحقل المغناطيسي المزدوجة الربط المباشر مع مروحة هوائية ربط MATLAB مع FEMMIndex. décimale : 622 Electro-Technique Résumé : In this thesis, we have designed and modeled a prototype of a Double Salient Switched Reluctance Machine (DSSRM 6/4), using an analytic-numerical approach under MATLAB programming language. The electromagnetic characteristics and the performances of the prototype had studied interactively using the finite element software FEMM coupled with MATLAB software. The simulations of the machine in dynamic mode, in motor modes (linear and saturated case taking into account the optimization of the control angles of the associated converter) and in generator mode (in the case of a small wind turbine), had been built and analyzed under MATLAB / Simulink environment.
Diplôme : Doctorat En ligne : ../theses/electrotec/BEN7325.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10975 Dimensionnement, modélisation et optimisation de machines à réluctance variable : Applications en Moteur/Générateur. [texte imprimé] / Tariq Benamimour, Auteur ; Ammar Bentounsi, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 153 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Electro-techniqueTags : Machine à Reluctance Variable Méthode des Eléments Finis moteur générateur caractéristiques
magnétiques éolienne à attaque directe couplage FEMM-MATLAB Switched Reluctance Machine Finite Element Analysis motor generator magnetic characteristics direct attack wind turbine coupling MATLAB to FEMM ماكينة ذات ممانعة متغيرة طريقة العناصر المنتهية محرك مولد الحقل المغناطيسي المزدوجة الربط المباشر مع مروحة هوائية ربط MATLAB مع FEMMIndex. décimale : 622 Electro-Technique Résumé : In this thesis, we have designed and modeled a prototype of a Double Salient Switched Reluctance Machine (DSSRM 6/4), using an analytic-numerical approach under MATLAB programming language. The electromagnetic characteristics and the performances of the prototype had studied interactively using the finite element software FEMM coupled with MATLAB software. The simulations of the machine in dynamic mode, in motor modes (linear and saturated case taking into account the optimization of the control angles of the associated converter) and in generator mode (in the case of a small wind turbine), had been built and analyzed under MATLAB / Simulink environment.
Diplôme : Doctorat En ligne : ../theses/electrotec/BEN7325.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10975 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEN/7325 BEN/7325 Thèse Bibliothèque principale Thèses Disponible
Titre : Modélisation numérique du comportement mécanique des jonctions tubulaires soudées des plateformes offshore. Type de document : texte imprimé Auteurs : Samira Belhour, Auteur ; Ahmed Bellaouar, Directeur de thèse Mention d'édition : 24\02\2021 Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2021 Importance : 122 f. Format : 30 cm. Note générale : 1 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : G. Mécanique: Construction mécanique méthode des éléments finis facteur d’intensité de contrainte modélisation numérique plateforme
offshore joints tubulaire joint soudés fatigue des structures éléments Shell finite element method stress intensity factor numerical modeling offshore platform tubular joints welded joints fatigue of offshore structures Shell elements طريقة العناصر المحدودة عامل شدة الإجهاد النمذجة العددية المنصة البحرية المفاصل الأنبوبية المفاصل
الملحومة التعب الهيكلي عناصر شاIndex. décimale : 620 Génie Mécanique Résumé :
Tubular steel structures are widely used in the construction of offshore platforms; several types of junctions are used in this field. The tubular members are assembled by welding, thus forming complex brace/chord intersections which represent structural discontinuities leading to high stress concentration in the vicinity of the weld bead. These joints are subjected to repeated loading over time leading to fatigue damage, hence the need to predict stresses around welded intersections. It is with this in mind that a numerical modeling of the mechanical behavior was carried out using two software programs ANSYS, and COMSOLMULTIPHYSICS. A numerical modeling in 2D with thin Shell elements and 3D with 20 Nodes solid elements was carried out by applying three basic loadings axial loading AX, in-plane bending “IPB”, out-of-plane bending “OPB” and a combined loading COM, aiming to predict the concentrations of stresses around the weld bead area. The results obtained show that for the three types of loadings AX, OPB and COM; the maximum stresses are located at saddle point However, for IPB loading they are located in a position between the two crown and saddle points. A parametric study was also performed to analyze the effect of the dimensionless geometric parameters α, , , β, . The results of SCf are validated by the parametric equations.
Note de contenu :
Annexes.Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BEL7749.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11582 Modélisation numérique du comportement mécanique des jonctions tubulaires soudées des plateformes offshore. [texte imprimé] / Samira Belhour, Auteur ; Ahmed Bellaouar, Directeur de thèse . - 24\02\2021 . - جامعة الإخوة منتوري قسنطينة, 2021 . - 122 f. ; 30 cm.
1 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : G. Mécanique: Construction mécanique méthode des éléments finis facteur d’intensité de contrainte modélisation numérique plateforme
offshore joints tubulaire joint soudés fatigue des structures éléments Shell finite element method stress intensity factor numerical modeling offshore platform tubular joints welded joints fatigue of offshore structures Shell elements طريقة العناصر المحدودة عامل شدة الإجهاد النمذجة العددية المنصة البحرية المفاصل الأنبوبية المفاصل
الملحومة التعب الهيكلي عناصر شاIndex. décimale : 620 Génie Mécanique Résumé :
Tubular steel structures are widely used in the construction of offshore platforms; several types of junctions are used in this field. The tubular members are assembled by welding, thus forming complex brace/chord intersections which represent structural discontinuities leading to high stress concentration in the vicinity of the weld bead. These joints are subjected to repeated loading over time leading to fatigue damage, hence the need to predict stresses around welded intersections. It is with this in mind that a numerical modeling of the mechanical behavior was carried out using two software programs ANSYS, and COMSOLMULTIPHYSICS. A numerical modeling in 2D with thin Shell elements and 3D with 20 Nodes solid elements was carried out by applying three basic loadings axial loading AX, in-plane bending “IPB”, out-of-plane bending “OPB” and a combined loading COM, aiming to predict the concentrations of stresses around the weld bead area. The results obtained show that for the three types of loadings AX, OPB and COM; the maximum stresses are located at saddle point However, for IPB loading they are located in a position between the two crown and saddle points. A parametric study was also performed to analyze the effect of the dimensionless geometric parameters α, , , β, . The results of SCf are validated by the parametric equations.
Note de contenu :
Annexes.Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BEL7749.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11582 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BEL/7749 BEL/7749 Thèse Bibliothèque principale Thèses Disponible
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