ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

4pSAa6. Tailoring material properties of acoustic blankets for reducing radiated noise.

Courtney B. Burroughs

Grad. Prog. in Acoust., Penn State Univ., State College, PA 16804

The development and application of a mathematical model that considers the reduction in acoustic radiation produced by varying the material properties of a viscoelastic blanket in the direction parallel to the surface of the blanket are presented. The blanket covers an elastic plate which is driven on the side opposite the blanket by an incident acoustic wave. The model is used to compute the spatial distribution of the pressure on the top surface of the blanket. The total acoustic radiated power, normalized to the magnitude of the pressure incident on the plate, is computed from the surface pressure. Examples of the effectiveness of homogeneous and nonhomogeneous blankets in reducing acoustic radiation are presented. The effects of damping in the blanket are also examined.