Les Inscriptions à la Bibliothèque sont ouvertes en
ligne via le site: https://biblio.enp.edu.dz
Les Réinscriptions se font à :
• La Bibliothèque Annexe pour les étudiants en
2ème Année CPST
• La Bibliothèque Centrale pour les étudiants en Spécialités
A partir de cette page vous pouvez :
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Détail de l'indexation
M000782
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Ouvrages de la bibliothèque en indexation M000782
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Etude des vibrations de torsion du groupe motopropulseur des camions SNVI - SONACOME / Mohamed Boukabache
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Titre : Etude des vibrations de torsion du groupe motopropulseur des camions SNVI - SONACOME Type de document : texte imprimé Auteurs : Mohamed Boukabache, Auteur ; Gantchev, E., Directeur de thèse Editeur : [S.l.] : [s.n.] Année de publication : 1982 Importance : 194 f. Présentation : ill. Format : 30 cm. Note générale : Mémoire de Magister: Génie Mécanique: Alger, Ecole Nationale Polytechnique: 1982
Bibliogr. 190 - 194 fLangues : Français (fre) Mots-clés : Vibrations de torsion ; Groupe motopropulseur ; Camion SNVI SONACOME ; Système excite-amorti Index. décimale : M000782 Résumé : Les vibrations mécaniques ont ordinairement un caractère parasitaire, qu'on traitait auparavant comme un inconvénient mineur.
Ainsi pour éviter les résonances, on se contentait de se tenir assez loin des conditions dites "critiques".
Il est d'ailleurs, reconnu aujourd'hui que même tenues loin de la raisonance, les vibrations altérent la structure des matériaux, et par suite leur endurance.
Il est donc très important de savoir étudier les vibrations et de connaître les méthodes de réduction de leur effet nuisible.
L'étude des vibrations dans le groupe moto-propulsuer des véhicules automobiles, et la recherche des moyens pour leur diminution, contribuent à l'amélioration de la fiabilité, de la longévité ainsi que du confort; exigences contemporaines auxquelles on a accorde beaucoup d'importance à l'heure actuelle.
L'analyse numérique a montré que lors des régimes normaux, mis a part les couples Mg et Mio qui agissent sur l'arbre de transmission, les autres charges dynamiques sont cohérentes avec les valeurs admissibles des éléments de la transmission.
Les différentes variantes étudiées expliquent que les fortes pulsations de couples proportitonnelles à l'inertie massique de la partie de la transmission, située entre les deux joints, sont dues aux fortes accélérations angulaires à des régimes élevés et surtout aux vitesses de résonances (coïncidence entre les fréquence propres et les fréquences d'excitations).
Pour résoudre ce problème, il s'agit par conséquent de diminuer les pulsations de couples agissant entre les deux joints en intervenant sur les paramètres suivants:
- Réduire la vitesse maximum de la transmission de manière à éviter les résonances avec l'excitation des cardans (w < 218 rd/s).
- Réduire les angularités au niveau des joints (véhicules sans charge).
- Améliorer la qualité du damper.Etude des vibrations de torsion du groupe motopropulseur des camions SNVI - SONACOME [texte imprimé] / Mohamed Boukabache, Auteur ; Gantchev, E., Directeur de thèse . - [S.l.] : [s.n.], 1982 . - 194 f. : ill. ; 30 cm.
Mémoire de Magister: Génie Mécanique: Alger, Ecole Nationale Polytechnique: 1982
Bibliogr. 190 - 194 f
Langues : Français (fre)
Mots-clés : Vibrations de torsion ; Groupe motopropulseur ; Camion SNVI SONACOME ; Système excite-amorti Index. décimale : M000782 Résumé : Les vibrations mécaniques ont ordinairement un caractère parasitaire, qu'on traitait auparavant comme un inconvénient mineur.
Ainsi pour éviter les résonances, on se contentait de se tenir assez loin des conditions dites "critiques".
Il est d'ailleurs, reconnu aujourd'hui que même tenues loin de la raisonance, les vibrations altérent la structure des matériaux, et par suite leur endurance.
Il est donc très important de savoir étudier les vibrations et de connaître les méthodes de réduction de leur effet nuisible.
L'étude des vibrations dans le groupe moto-propulsuer des véhicules automobiles, et la recherche des moyens pour leur diminution, contribuent à l'amélioration de la fiabilité, de la longévité ainsi que du confort; exigences contemporaines auxquelles on a accorde beaucoup d'importance à l'heure actuelle.
L'analyse numérique a montré que lors des régimes normaux, mis a part les couples Mg et Mio qui agissent sur l'arbre de transmission, les autres charges dynamiques sont cohérentes avec les valeurs admissibles des éléments de la transmission.
Les différentes variantes étudiées expliquent que les fortes pulsations de couples proportitonnelles à l'inertie massique de la partie de la transmission, située entre les deux joints, sont dues aux fortes accélérations angulaires à des régimes élevés et surtout aux vitesses de résonances (coïncidence entre les fréquence propres et les fréquences d'excitations).
Pour résoudre ce problème, il s'agit par conséquent de diminuer les pulsations de couples agissant entre les deux joints en intervenant sur les paramètres suivants:
- Réduire la vitesse maximum de la transmission de manière à éviter les résonances avec l'excitation des cardans (w < 218 rd/s).
- Réduire les angularités au niveau des joints (véhicules sans charge).
- Améliorer la qualité du damper.Exemplaires
Code-barres Cote Support Localisation Section Disponibilité Spécialité Etat_Exemplaire M000782 M000782 Papier Bibliothèque centrale Mémoire de Magister Disponible Documents numériques
BOUKABACHE.Mohamed.pdfURL