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Vibration and acoustic radiation of fluid-loaded sandwich panels / Abdelouahab Benzerdjeb 

Public ISBD Titre : Vibration and acoustic radiation of fluid-loaded sandwich panels Type de document : texte imprimé Auteurs : Abdelouahab Benzerdjeb, Auteur ; Sauro Pierucci, Directeur de thèse Editeur : San Diego State University Année de publication : 1984 Importance : 98 f. Présentation : ill. Format : 28 cm. Note générale : Mémoire de Master : Génie Mécanique : Etats-Unis, San Diego State University : 1984 Bibliogr. f. 100 - 101 . Annexe f. 103 - 133 Langues : Anglais (eng) Mots-clés : Fluids Acoustic  pressure Sandwich  panel Narayanan  analysis Shanbhag  analysis Index. décimale : Ms00884 Résumé : The purpose of this study is to analyze the effect of fluids heavier than air on the vibrational characteristics and on the radiated acoustic pressure of a sandwich panel. A sandwich panel consits of two face-plates (skins) and a inner soft viscoelastic layer (core). The differential equation governing the motion of the sandwich panel derived by Narayanan and Shannhag is used inthe present analysis. The characteristic equation governing the vibration of the sandwich panel derived in the present study is reduced to simpler form for the militing conditions of zero fluid density and zero core thickness; the results obtained are compared to exixting results for similar configurations. The roots loci of the fluid and the structural wave numbers are obtained by solving the characteristic equation governing the motion of the structure. Finally, the acoustic pressure radiated from the structure into the far-field is approximated by the method of stationary phase. A comparison of the results obtained for the sandwich panel with two aluminun face-plates (1 cm thick) to those obtained for the equivalent aluminum plate (2 cm thick) shows that the far-field radiated acoustic pressure can be reduced by using an inner soft viscoelastic core between two face-plates. An analysis of the core properties and core thickness shows that a proper choice of the core properties and thickness can be selected to optimize the acoustical requirements of a particular problem. Vibration and acoustic radiation of fluid-loaded sandwich panels [texte imprimé] / Abdelouahab Benzerdjeb, Auteur ; Sauro Pierucci, Directeur de thèse . - [S.l.] : San Diego State University, 1984 . - 98 f. : ill. ; 28 cm. Mémoire de Master : Génie Mécanique : Etats-Unis, San Diego State University : 1984 Bibliogr. f. 100 - 101 . Annexe f. 103 - 133 Langues : Anglais (eng) Mots-clés : Fluids Acoustic  pressure Sandwich  panel Narayanan  analysis Shanbhag  analysis Index. décimale : Ms00884 Résumé : The purpose of this study is to analyze the effect of fluids heavier than air on the vibrational characteristics and on the radiated acoustic pressure of a sandwich panel. A sandwich panel consits of two face-plates (skins) and a inner soft viscoelastic layer (core). The differential equation governing the motion of the sandwich panel derived by Narayanan and Shannhag is used inthe present analysis. The characteristic equation governing the vibration of the sandwich panel derived in the present study is reduced to simpler form for the militing conditions of zero fluid density and zero core thickness; the results obtained are compared to exixting results for similar configurations. The roots loci of the fluid and the structural wave numbers are obtained by solving the characteristic equation governing the motion of the structure. Finally, the acoustic pressure radiated from the structure into the far-field is approximated by the method of stationary phase. A comparison of the results obtained for the sandwich panel with two aluminun face-plates (1 cm thick) to those obtained for the equivalent aluminum plate (2 cm thick) shows that the far-field radiated acoustic pressure can be reduced by using an inner soft viscoelastic core between two face-plates. An analysis of the core properties and core thickness shows that a proper choice of the core properties and thickness can be selected to optimize the acoustical requirements of a particular problem.

Exemplaires

Code-barres	Cote	Support	Localisation	Section	Disponibilité	Spécialité	Etat_Exemplaire
Ms00884	Ms00884	Papier	Bibliothèque centrale	Mémoire de Master	Disponible

Documents numériques

BENZERDJEB.Abdelouahab.pdf URL