초록 ▼

A low vibroacoustic structure 10 according to the present invention comprises a first facesheet 12 defining a plurality of first holes 22, a second facesheet 16 defining a plurality of second holes 36, and a core 14. The first and second facesheets are attached to opposed surfaces of the core. The c

A low vibroacoustic structure 10 according to the present invention comprises a first facesheet 12 defining a plurality of first holes 22, a second facesheet 16 defining a plurality of second holes 36, and a core 14. The first and second facesheets are attached to opposed surfaces of the core. The core defines a plurality of passages 32 in communication with the first and second holes to form channels 38 through the structure. The core is typically a honeycomb sheet. The first and second facesheets and the core are formed of lightweight materials such as lightweight metals, metal matrix composites, or polymer matrix composites. The perforated structure reduces structural acoustic coupling and acoustically induced vibration. The structure can be formed as a panel. The panel can be attached to support structures exposed to high-energy acoustic environments to reduce acoustically induced vibration of the structures.

대표청구항 ▼

[ What is claimed is:] [1.] A low vibroacoustic structure, comprising:(a) a core including a first surface, a second surface opposite the first surface, and a honeycomb structure disposed between the first and second surfaces, said honeycomb structure forming a series of passages through the core an

[ What is claimed is:] [1.] A low vibroacoustic structure, comprising:(a) a core including a first surface, a second surface opposite the first surface, and a honeycomb structure disposed between the first and second surfaces, said honeycomb structure forming a series of passages through the core and extending through the first and second surfaces;(b) a first facesheet having a predetermined facial area on the first surface of the core, the first facesheet defining a plurality of first holes therethrough; and(c) a second facesheet having a predetermined facial area on the second facesheet defining a plurality of second holes therethrough,the first and second holes being in substantially aligned communication with the passages extending through the core, thereby forming a plurality of continuous channels through the structure, wherein the ratio of the cross-sectional area of the plurality of the first holes and the second holes, respectively, to the predetermined facial area of the first facesheet and the second facesheet, respectively, is in the range of 11.5% to 51%, so as to reduce acoustically induced vibration of the structure over the sound frequency range of from about 20 Hz to about 500 Hz.