Noise reduction system for structures
AssigneeThe Boeing Company
InventorGopal Prasad Mathur
Life of this patent
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Abstract
A method and apparatus are present for reducing noise. The apparatus comprises a core and a face sheet. The core is configured to reduce a speed of shear waves traveling through the core. The face sheet is located over a first surface of the core and is configured to reduce a speed of bending waves traveling through the face sheet. A second surface of the core is configured for attachment to a surface of a structure.
Claims20
An apparatus for reducing the speed of shear waves and bending waves passing through a structure comprising:
- a first core, the first core having a first surface and a second surface a damping layer located on a second surface of the first core;
- a first face sheet located over the damping layer and opposite the first core,
- a second face sheet located on a second surface of the first core;
- a second core located between the second face sheet and a surface of the structure;
- wherein the first core, the damping layer, the first face sheet, the second face sheet, and the second core reduce a speed of shear waves traveling through the structure and reduce a speed of bending waves traveling through the structure.
A method for reducing noise, the method comprising:
- identifying a structure for noise reduction;
- attaching a first set of noise reduction devices to the structure in which the first noise reduction device comprises a core having a first surface and a second surface, and a first face sheet disposed on the first surface of the core, and wherein the core is attached to the structure;
- attaching a second set of noise reduction devices to the first set of noise reduction devices, the second set of noise reduction devices comprising a second core, a second face sheet, and a damping layer positioned between the second core and the second face sheet;
- reducing a speed of shear waves traveling through the core;
- and
- reducing a speed of bending waves traveling through the face sheet.
A system for reducing the speed of sound waves passing into a structure comprising:
- a structure having a first surface;
- shear waves traveling through the structure, the shear waves characterized by a speed;
- bending waves traveling through the structure, the bending waves characterized by a speed;
- a tile having a first surface and a second surface, wherein the first surface of the tile is attached to the first surface of the structure;
- the tile comprising a first core having a first surface and a second surface;
- a first face sheet disposed on the first surface of the core;
- a second core disposed on the first face sheet, a damping layer disposed on the second core, and a second face sheet disposed on the damping layer;
- wherein the speed of the shear waves traveling through the core is reduced;
- and
- wherein the speed of the bending waves traveling through the face sheet is reduced.
Dependencies are inferred from the claim text.