Abstract
Several kinds of novel composite structures, such as advanced grid stiffened (AGS) and chamber core (CC) structures have been designed, fabricated, and investigated for both civil and military applications. The chamber core composite is a novel advanced sandwich-type structure that is created by filament winding an inner shell onto a cylindrical mandrel, arranging previously fabricated U-shaped channels around the perimeter of this shell to form the inner chamber walls, and filament winding an outer shell followed by a co-cure process. In this study, the structural/acoustic behavior of a normal composite chamber core cylinder is investigated both theoretically and experimentally. Lightly coupled structural and acoustic modal parameters are identified using experimental modal analysis techniques. The properties of sound transmission loss (TL) of the cylinder are also investigated experimentally. The effect of the structural/acoustic natural frequencies and the damping on the sound transmission loss is analyzed. Finally, passive control strategies are discussed, and several passive control materials for improving the sound transmission loss (0–500 Hz) of the cylinder are experimentally evaluated. [Work sponsored by the Air Force Research Laboratory Space Vehicles Directorate (AFRL/VS), POC Dr. Steven Lane, (505) 846-9944.]
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