Download or read book METHODE DE PREDICTION DU RAYONNEMENT ACOUSTIQUE DE STRUCTURES VOLUMIQUES COMPOSEES D UNE OU PLUSIEURS FACES PLANES VIBRANTES APPLICATION AUX INSTRUMENTS DE MUSIQUE A CORDES written by ALEXIS.. LE PICHON and published by . This book was released on 1996 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA CONNAISSANCE A TOUTES LES FREQUENCES DE LA PUISSANCE ACOUSTIQUE RAYONNEE PAR UNE STRUCTURE VIBRANTE EST D'UNE GRANDE IMPORTANCE POUR L'ETUDE DE SON COMPORTEMENT VIBRO-ACOUSTIQUE. LA METHODE DES ELEMENTS FINIS DE FRONTIERE (BEM: BOUNDARY ELEMENT METHOD) EST UNE FORMULATION NUMERIQUE RECENTE BASEE SUR DES EQUATIONS INTEGRALES DE FRONTIERES. ELLE PERMET DE PREDIRE LA PRESSION TELLE QU'ELLE EST PERCUE PAR UNE PERSONNE SITUEE A PROXIMITE D'UNE SOURCE SONORE. SON EFFICACITE A ETE PROUVEE DANS DE NOMBREUX DOMAINES COMME LA LOCALISATION D'UNE SOURCE, LA QUANTIFICATION DU NIVEAU DE BRUIT D'UNE MACHINE OU ENCORE LA PREDICTION DU DIAGRAMME DE DIRECTIVITE D'UN INSTRUMENT DE MUSIQUE. DANS LE CAS PARTICULIER DE SOURCES PLANES, L'EQUATION INTEGRALE A RESOUDRE PREND LA FORME D'UN PRODUIT DE CONVOLUTION SPATIAL ET LA TRANSFORMEE DE FOURIER RAPIDE (FFT) EST BIEN ADAPTEE A SA RESOLUTION. L'HOLOGRAPHIE PLANE ACOUSTIQUE S'APPUIE SUR CETTE FORMULATION. DANS LE CADRE DE CE TRAVAIL, LE RAYONNEMENT DE STRUCTURES VOLUMIQUES COMPOSEES D'UNE FACE VIBRANTE EST ETUDIE. DES ETUDES COMPARATIVES DES CONTRIBUTIONS AU RAYONNEMENT PROVENANT DES SURFACES VIBRANTES ET DE LA DIFFRACTION SUR LES SURFACES RIGIDES SONT FAITES. CES CONSIDERATIONS PERMETTENT DE FAIRE CERTAINES HYPOTHESES SIMPLIFICATRICES SUR LA GEOMETRIE DE LA SOURCE ET RENDENT APPLICABLES L'UTILISATION DES TECHNIQUES D'HOLOGRAPHIE PLANE. UNE METHODE ITERATIVE, AVEC COMME ALGORITHME DE BASE LA FFT, EST PROPOSEE. ELLE PERMET LA PREDICTION DU RAYONNEMENT DE SOURCES VOLUMIQUES COMPOSEES D'UNE OU DE PLUSIEURS FACES PLANES VIBRANTES. LA METHODE PRESENTEE CONSTITUE UN MODELE PRELIMINAIRE POUR LA SIMULATION DU RAYONNEMENT ACOUSTIQUE DE CERTAINS INSTRUMENTS DE MUSIQUE COMPOSES D'UNE TABLE D'HARMONIE ET D'UN CORPS SUPPOSE RIGIDE. LA VALIDITE DE LA METHODE EST VERIFIEE EN COMPARANT LES SIMULATIONS AVEC DES MESURES DE RAYONNEMENT EFFECTUES EN CHAMBRE ANECHOIQUE SUR UNE GUITARE ET UNE HARPE CELTIQUE. LE PRINCIPAL AVANTAGE DE CETTE APPROCHE EST DE POUVOIR DISPOSER D'UN MODELE DE RAYONNEMENT SIMPLIFIE, AVEC UNE REDUCTION SIGNIFICATIVE DE LA CHARGE DE CALCUL ET DE LA COMPLEXITE DE PROGRAMMATION, COMPAREE A LA FORMULATION BEM. LE S HYPOTHESES SIMPLIFICATRICES PERMETTENT EN PARTICULIER L'UTILISATION DE MACHINES MOYENNES POUR DES CALCULS AU DEPART IMPORTANTS

Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

Download or read book The Physics of Musical Instruments written by Neville H. Fletcher and published by Springer Science & Business Media. This book was released on 2013-11-09 with total page 763 pages. Available in PDF, EPUB and Kindle. Book excerpt: While the history of musical instruments is nearly as old as civilisation itself, the science of acoustics is quite recent. By understanding the physical basis of how instruments are used to make music, one hopes ultimately to be able to give physical criteria to distinguish a fine instrument from a mediocre one. At that point science may be able to come to the aid of art in improving the design and performance of musical instruments. As yet, many of the subtleties in musical sounds of which instrument makers and musicians are aware remain beyond the reach of modern acoustic measurements. This book describes the results of such acoustical investigations - fascinating intellectual and practical exercises. Addressed to readers with a reasonable grasp of physics who are not put off by a little mathematics, this book discusses most of the traditional instruments currently in use in Western music. A guide for all who have an interest in music and how it is produced, as well as serving as a comprehensive reference for those undertaking research in the field.

Download or read book Construction Dictionary written by Nawic Education Foundation and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive listing of the terms and phrases used in construction. Included are many that are encountered daily on the jobsite or in the construction office.