In noise control engineering double wall structures are often used as an efficient solution to obtain a high insertion loss while the specific weight remains reasonable. Typical examples are double glass windows and propeller aircraft fuselages. The latter' are generally double wall structures consisting of an outer fuselage or skin panel and an inner fuselage or trim panel. The gap between the skin and trim panel is usually padded with fibreglass blankets. The outer fuselage is stiffened by periodically arranged frames and stringers. Vibration isolators attached to the frames provide a mechanical connection between the outer and inner fuselage. The dynamic behaviour of these structures is strongly influenced by the vibroacoustic coupling interaction between the fuselage panel and the enclosed air. This paper describes the analytical, numerical and experimental investigations of the low frequency vibro-acoustic behaviour of an aircraft-like double wall structure. The basic setup consists of two clamped flat aluminium panels with a 100 mm air gap. With the insights in this structure, a sensitivity analysis has been performed by padding the air gap with fibreglass blankets, stiffening one of the panels and connecting both panels with vibration isolators.
The effect of sound absorbing materials, plate stiffeners and vibration isolators on the vibro-acoustic behaviour of finite double wall structures
Der Einfluß von Geräusch-absorbierenden Materialien, Blechvertiefungen und Schwingungsabsorbern auf das vibro-akustische Verhalten von finiten Doppelwand-Strukturen
ISMA, ISMA, Tools for Noise and Vibration Analysis, 19 ; 1 ; 101-123
1994
23 Seiten, 16 Bilder, 7 Tabellen, 7 Quellen
Conference paper
English
Bauteil , Geräuschminderung , Geräuschdämpfung , Auslegung (Dimension) , spezifisches Gewicht , Flugzeugbau , Flugzeugrumpf , Gewichtsminimierung , Sandwich-Bauweise , Glasfaser , Versteifung , Längsrichtung , Schwingungssystem , Schwingungsdämpfung , Betriebsverhalten , experimentelle Untersuchung , Frequenzspektrum , Werkstoffeignung , Flugzeug , Luftfahrtindustrie , Dämpfung , Betriebsführung , Frequenzbereich , Gebrauchseignung , Werkstoffwahl
Vibro-Acoustic Analyses of Double Wall Structures
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