ASA 126th Meeting Denver 1993 October 4-8

4aSA2. Some structural acoustic features of multilayer composite plates.

M. Kim Y. F. Hwang

Carderock Div., Naval Surface Warfare Ctr., Bethesda, MD 20084-5000

This paper discussed the propagation of free waves and the vibroacoustic response of a multilayer composite plate subjected to a point-force excitation. The dispersion characteristics for various modes of wave propagation as a function of geometrical configuration, elastic properties, and material loss factor are discussed. Acoustic radiation into water from a composite plate subjected to a point force acting on its dry (air) side has been evaluated. Numerical examples focus on a three-layer (elastic/viscoelastic/elastic) sandwich plate with a variety of different elastic/viscoelastic material properties (elastic constants, damping) and thicknesses. The advantages and disadvantages of a sandwich plate as compared to a homogeneous plate of equal flexural rigidity are also discussed. [Work supported by ONR.]