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Titre : Analyse dynamique des structures mécaniques par la méthode des éléments finis. Type de document : texte imprimé Auteurs : Fareh Hamrit, Auteur ; Brahim Necib, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 135 f. Format : 30 cm. Note générale : copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Structures mécaniques rigidité déformation contrainte modes de vibration éléments finis élément barre élément poutre élément plaque assemblage énergie de déformation forces internes Mechanical structures stiffness deformation stress vibration modes finite elements bar
element beam element plate element assembly deformation energy internal forces الهياكل الميكانيكية وصلابة وتشوه والإجهاد وسائط الاهتزاز والعناصر المحدودة عنصر شريط عنصر شعاع عنصر لوحة والتجمع والطاقة تشوه القوى الداخليةIndex. décimale : 620 Génie Mécanique Résumé : The mechanicaldiscrete or continuumstructures are actually of great importance in the application field of contemporary modern industry. However, during their life time these structures are often subjected to considerable external stresses or to high amplitudes of vibrations which can cause them large deformations and internal stresses which can cause them internal cracking or even their total destruction. In order to avoid these types of problems, the concept of static and dynamic analysis of these structures is recommended, and due to the complexity of their shape and size, the finite element method is the most used. The latter is currently recognized as a very powerful technique for the static and dynamic analysis of discrete or continuous structures of complicated form applied in the field of mechanics, aeronautics, civil engineering, maritime or robotics. Consequently, the calculation and
dimensioning of these mechanical systems by the finite element method plays an important role at the service of the industry for possible sizing and prediction of their lifetime. Our work consists of static and dynamic analysis of two-dimensional discrete and continuous mechanical systems using the finite element method based on the main elements of bars, beams and plates, under the effect of external excitations with different boundary conditions. The discrete structures considered are twodimensional in metallic framework interconnected to the nodes by welding, riveting or bolted under various boundary conditions. Their elements are modeled comparatively by bar elements and beam elements, while for continuous structures the elements are rectangular thin plates with different boundary conditions. The excitation forces are based on periodic, random or impulsive forces and a numerical solution by development of a program to describe the behavior of these structures is realized. The mass and stiffness matrices of all the structures are determined respectively by assembling the bars, beam and plate elements based on the kinetic and deformation energy for each element. The displacements, the node reactions and the axial forces in all the elements as well as the transverse stresses and the eigenvalues of the structures under different boundary conditions were also calculated and good results were obtained compared to those obtained using other software
Already existing. In fact, analysis using the finite element method will allow the proper dimensioning and design of complex industrial mechanical structures according to different boundary conditions, their internal loading and their vibratory level.
Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/HAM7246.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10839 Analyse dynamique des structures mécaniques par la méthode des éléments finis. [texte imprimé] / Fareh Hamrit, Auteur ; Brahim Necib, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 135 f. ; 30 cm.
copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Structures mécaniques rigidité déformation contrainte modes de vibration éléments finis élément barre élément poutre élément plaque assemblage énergie de déformation forces internes Mechanical structures stiffness deformation stress vibration modes finite elements bar
element beam element plate element assembly deformation energy internal forces الهياكل الميكانيكية وصلابة وتشوه والإجهاد وسائط الاهتزاز والعناصر المحدودة عنصر شريط عنصر شعاع عنصر لوحة والتجمع والطاقة تشوه القوى الداخليةIndex. décimale : 620 Génie Mécanique Résumé : The mechanicaldiscrete or continuumstructures are actually of great importance in the application field of contemporary modern industry. However, during their life time these structures are often subjected to considerable external stresses or to high amplitudes of vibrations which can cause them large deformations and internal stresses which can cause them internal cracking or even their total destruction. In order to avoid these types of problems, the concept of static and dynamic analysis of these structures is recommended, and due to the complexity of their shape and size, the finite element method is the most used. The latter is currently recognized as a very powerful technique for the static and dynamic analysis of discrete or continuous structures of complicated form applied in the field of mechanics, aeronautics, civil engineering, maritime or robotics. Consequently, the calculation and
dimensioning of these mechanical systems by the finite element method plays an important role at the service of the industry for possible sizing and prediction of their lifetime. Our work consists of static and dynamic analysis of two-dimensional discrete and continuous mechanical systems using the finite element method based on the main elements of bars, beams and plates, under the effect of external excitations with different boundary conditions. The discrete structures considered are twodimensional in metallic framework interconnected to the nodes by welding, riveting or bolted under various boundary conditions. Their elements are modeled comparatively by bar elements and beam elements, while for continuous structures the elements are rectangular thin plates with different boundary conditions. The excitation forces are based on periodic, random or impulsive forces and a numerical solution by development of a program to describe the behavior of these structures is realized. The mass and stiffness matrices of all the structures are determined respectively by assembling the bars, beam and plate elements based on the kinetic and deformation energy for each element. The displacements, the node reactions and the axial forces in all the elements as well as the transverse stresses and the eigenvalues of the structures under different boundary conditions were also calculated and good results were obtained compared to those obtained using other software
Already existing. In fact, analysis using the finite element method will allow the proper dimensioning and design of complex industrial mechanical structures according to different boundary conditions, their internal loading and their vibratory level.
Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/HAM7246.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=10839 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité HAM/7246 HAM/7246 Thèse Bibliothèque principale Thèses Disponible Modélisation par la méthode des éléments finis du comportement dynamique du couple roue-rail. / Latifa Boussalia
Titre : Modélisation par la méthode des éléments finis du comportement dynamique du couple roue-rail. Type de document : texte imprimé Auteurs : Latifa Boussalia, Auteur ; Ahmed Bellaouar, Directeur de thèse Editeur : جامعة الإخوة منتوري قسنطينة Année de publication : 2018 Importance : 140 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles
Langues : Français (fre) Catégories : Français - Anglais
Génie MécaniqueTags : Génie Mécanique: Construction Mécanique Contact roulant contact roue-rail modélisation numérique défauts géométriques analyse modale analyse dynamique éléments finis Rolling contact wheel-rail contact numerical modeling geometrical defects modal analysis dynamic analysis finite elements الالتماس الدوراني التماس عجلة-سكة النمذجة العددية العيوب الهندسية تحليل الوسائط التحليل الديناميكي العناصر المحدودة Index. décimale : 620 Génie Mécanique Résumé :
The work presented in this thesis highlights the influence of geometrical singularities on the mechanical behavior of wheel-rail torque. With the increase in the loads transported by axles, the traffic speeds and the state of the tracks, the damage of the wheels is very solicited, leading to more or less serious accidents. The tool used is the ANSYS software based on numerical modeling using the finite element method. The objective of this thesis has been to develop a complete approach to a dynamic analysis of the wheels of the railcar and the wheel-rail pair in contact, allowing to take into account the local demands from the real geometry of the contact wheel- rail, the elastic behavior of the wheel material and the rail (steel) and the operating conditions (load on the wheel and speed). The proposed digital approach deals with two main parts. In the first part, a static analysis was carried out, aiming to model the mechanical behavior of a wheel with different forms of geometrical defects on the tread (circular shape, elliptical shape and any shape, and a perfect wheel), and the wheel-rail pair in contact. In the second part, the dynamic problem of the wheel-rail contact is solved by using the implicit temporal integration scheme. The 3D model developed takes into account only the elastic behavior of the bodies in contact, in the presence of the geometrical defect. However, the central problem in the dynamics of the couple in contact is solved by simplified methods based on the Hertz and Kalker theories implemented in the majority of finite element calculation codes. Finally, a comparative study using a simple modal analysis between the own frequencies of the wheel with and without defect has been proposed. In order to check the vibratory response of these, and to understand exactly how the vibrations may produce minor or catastrophic reactions. However, the different results were validated by an analytical calculation based on the Hertz theory and by some works in the literature.
Note de contenu :
Annexes.Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BOU7420.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11073 Modélisation par la méthode des éléments finis du comportement dynamique du couple roue-rail. [texte imprimé] / Latifa Boussalia, Auteur ; Ahmed Bellaouar, Directeur de thèse . - جامعة الإخوة منتوري قسنطينة, 2018 . - 140 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Génie MécaniqueTags : Génie Mécanique: Construction Mécanique Contact roulant contact roue-rail modélisation numérique défauts géométriques analyse modale analyse dynamique éléments finis Rolling contact wheel-rail contact numerical modeling geometrical defects modal analysis dynamic analysis finite elements الالتماس الدوراني التماس عجلة-سكة النمذجة العددية العيوب الهندسية تحليل الوسائط التحليل الديناميكي العناصر المحدودة Index. décimale : 620 Génie Mécanique Résumé :
The work presented in this thesis highlights the influence of geometrical singularities on the mechanical behavior of wheel-rail torque. With the increase in the loads transported by axles, the traffic speeds and the state of the tracks, the damage of the wheels is very solicited, leading to more or less serious accidents. The tool used is the ANSYS software based on numerical modeling using the finite element method. The objective of this thesis has been to develop a complete approach to a dynamic analysis of the wheels of the railcar and the wheel-rail pair in contact, allowing to take into account the local demands from the real geometry of the contact wheel- rail, the elastic behavior of the wheel material and the rail (steel) and the operating conditions (load on the wheel and speed). The proposed digital approach deals with two main parts. In the first part, a static analysis was carried out, aiming to model the mechanical behavior of a wheel with different forms of geometrical defects on the tread (circular shape, elliptical shape and any shape, and a perfect wheel), and the wheel-rail pair in contact. In the second part, the dynamic problem of the wheel-rail contact is solved by using the implicit temporal integration scheme. The 3D model developed takes into account only the elastic behavior of the bodies in contact, in the presence of the geometrical defect. However, the central problem in the dynamics of the couple in contact is solved by simplified methods based on the Hertz and Kalker theories implemented in the majority of finite element calculation codes. Finally, a comparative study using a simple modal analysis between the own frequencies of the wheel with and without defect has been proposed. In order to check the vibratory response of these, and to understand exactly how the vibrations may produce minor or catastrophic reactions. However, the different results were validated by an analytical calculation based on the Hertz theory and by some works in the literature.
Note de contenu :
Annexes.Diplôme : Doctorat en sciences En ligne : ../theses/gmecanique/BOU7420.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=11073 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité BOU/7420 BOU/7420 Thèse Bibliothèque principale Thèses Disponible 
Titre : Modélisation du comportement d’une distribution aléatoire des particules métalliques dans un séparateur magnétique en voie humide Type de document : texte imprimé Auteurs : Mehdi Ouili, Auteur ; Rabia Mehasni, Directeur de thèse Editeur : constantine [Algérie] : Université Constantine 1 Année de publication : 2013 Importance : 100 f. Format : 30 cm. Note générale : 2 copies imprimées disponibles Langues : Français (fre) Catégories : Français - Anglais
Electro-techniqueTags : ربط مغنوديناميكي العناصر المنتهية الجزيئات الدقيقة العزل و الالتقاط المغناطيسي couplage magnétodynamique éléments finis particules fines séparation magnétique magnetodynamical coupling,finite element fine particles magnetic separation Index. décimale : 622 Electro-Technique Résumé : This work presents a contribution to the study of wet magnetic separation problems. It concerns the computation of the behavior of a random dispersion of particles of different natures and forms. To take into account the random evolution of the present phenomena (magnetic, hydraulic and particle dynamic problem) a 3D numerical finite element resolution has been achieved. For this, we have used the multiphysic COMSOL software. To compute the particle trajectories we have applied the numerical Range-Kutta method. The treatment of static and flowing liquids has shown that a successful separation of ferromagnetic, conducting and charged particles may be achieved by applying a dynamic magnetic field. The ferromagnetic particles are captured by the electromagnet but the conducting and charged particles are repulsed away from the electromagnet. The analysis of the obtained results has
shown that the liquid flow has an important effect on the separation process. The optimization of the separator can lead to the confinement of the conducting and charged particles in a desired location for their collection.Diplôme : Magistère En ligne : ../theses/electrotec/OUI6427.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9442 Modélisation du comportement d’une distribution aléatoire des particules métalliques dans un séparateur magnétique en voie humide [texte imprimé] / Mehdi Ouili, Auteur ; Rabia Mehasni, Directeur de thèse . - constantine [Algérie] : Université Constantine 1, 2013 . - 100 f. ; 30 cm.
2 copies imprimées disponibles
Langues : Français (fre)
Catégories : Français - Anglais
Electro-techniqueTags : ربط مغنوديناميكي العناصر المنتهية الجزيئات الدقيقة العزل و الالتقاط المغناطيسي couplage magnétodynamique éléments finis particules fines séparation magnétique magnetodynamical coupling,finite element fine particles magnetic separation Index. décimale : 622 Electro-Technique Résumé : This work presents a contribution to the study of wet magnetic separation problems. It concerns the computation of the behavior of a random dispersion of particles of different natures and forms. To take into account the random evolution of the present phenomena (magnetic, hydraulic and particle dynamic problem) a 3D numerical finite element resolution has been achieved. For this, we have used the multiphysic COMSOL software. To compute the particle trajectories we have applied the numerical Range-Kutta method. The treatment of static and flowing liquids has shown that a successful separation of ferromagnetic, conducting and charged particles may be achieved by applying a dynamic magnetic field. The ferromagnetic particles are captured by the electromagnet but the conducting and charged particles are repulsed away from the electromagnet. The analysis of the obtained results has
shown that the liquid flow has an important effect on the separation process. The optimization of the separator can lead to the confinement of the conducting and charged particles in a desired location for their collection.Diplôme : Magistère En ligne : ../theses/electrotec/OUI6427.pdf Format de la ressource électronique : Permalink : index.php?lvl=notice_display&id=9442 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité OUI/6427 OUI/6427 Thèse Bibliothèque principale Thèses Disponible Documents numériques
texte intégraleAdobe Acrobat PDF
Titre : Non linear finite element analysis of reinforced concrete coupled shear walls Type de document : texte imprimé Auteurs : Salah-Eddine Djellab, Auteur ; T.J.A. Agar, Directeur de thèse Editeur : Scotland [UK] : University of Glasgow Année de publication : 1991 Importance : 156 f. Note générale : 1 Disponible à la salle de recherche Langues : Anglais (eng) Catégories : Français - Anglais
Génie CivilTags : Elements finis Mur Index. décimale : 624 Génie civil Diplôme : inconnu Permalink : index.php?lvl=notice_display&id=466 Non linear finite element analysis of reinforced concrete coupled shear walls [texte imprimé] / Salah-Eddine Djellab, Auteur ; T.J.A. Agar, Directeur de thèse . - Scotland [UK] : University of Glasgow, 1991 . - 156 f.
1 Disponible à la salle de recherche
Langues : Anglais (eng)
Catégories : Français - Anglais
Génie CivilTags : Elements finis Mur Index. décimale : 624 Génie civil Diplôme : inconnu Permalink : index.php?lvl=notice_display&id=466 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité DJE/2411 DJE/2411 Thèse Bibliothèque principale Thèses Disponible
Titre : Analyse du comportement des plaques minces et épaisses par éléments finis de mindlin Type de document : texte imprimé Auteurs : Gharbi Rahal ; Univ. de Constantine, Éditeur scientifique ; A. Charif, Directeur de thèse Année de publication : 1997 Importance : 109 f. Note générale : 1 Disponible à la salle de recherche
2 Disponibles au magasin de la bibliothèque centraleLangues : Français (fre) Catégories : Français - Anglais
Génie CivilTags : Elements finis Plaques minces Index. décimale : 624 Génie civil Permalink : index.php?lvl=notice_display&id=519 Analyse du comportement des plaques minces et épaisses par éléments finis de mindlin [texte imprimé] / Gharbi Rahal ; Univ. de Constantine, Éditeur scientifique ; A. Charif, Directeur de thèse . - 1997 . - 109 f.
1 Disponible à la salle de recherche
2 Disponibles au magasin de la bibliothèque centrale
Langues : Français (fre)
Catégories : Français - Anglais
Génie CivilTags : Elements finis Plaques minces Index. décimale : 624 Génie civil Permalink : index.php?lvl=notice_display&id=519 Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité RAH/2984 RAH/2984 Thèse Bibliothèque principale Thèses Disponible
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