Acoustic panel for noise attenuation

Patent metadata

Field	Value
Publication number	US-11804206-B2
Application number	US-202117318868-A
Country	US
Kind code	B2
Filing date	May 12, 2021
Priority date	May 12, 2021
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

An acoustic attenuation structure includes a periodic structure having a first unit cell, the first unit cell having a first central body and a first axial tube disposed on the first central body and a second axial tube disposed on the first central body, opposite the first axial tube, each of the first axial tube and the second axial tube being in fluid communication with one another through the first central body.

First claim

What is claimed is:

1. An acoustic attenuation structure, comprising:
a periodic structure having a first unit cell, the first unit cell having a first central body and a first axial tube disposed on the first central body and a second axial tube disposed on the first central body, opposite the first axial tube, each of the first axial tube and the second axial tube being in fluid communication with one another through the first central body, a second unit cell interconnected to the first unit cell, the second unit cell having a second central body and a pair of axial tubes disposed on and in fluid communication with the second central body, wherein a hole defines a space extending between the first unit cell and the second unit cell, the space being at least partially restricted by a hole mesh.

2. The acoustic attenuation structure of claim 1 , wherein the first unit cell and the second unit cell each include a first lateral tube, disposed on and in fluid communication with the first central body, and a second lateral tube, opposite the first lateral tube and disposed on and in fluid communication with the first central body.

3. The acoustic attenuation structure of claim 2 , wherein the first unit cell and the second unit cell each include a third lateral tube, disposed on and in fluid communication with the first central body, and a fourth lateral tube, opposite the third lateral tube and disposed on and in fluid communication with the first central body.

4. The acoustic attenuation structure of claim 3 , wherein each of the first axial tube, the second axial tube, the first lateral tube, the second lateral tube, the third lateral tube and the fourth lateral tube are in fluid communication with each other via the first central body.

5. The acoustic attenuation structure of claim 4 , wherein at least one of the first axial tube, the second axial tube, the first lateral tube, the second lateral tube, the third lateral tube or the fourth lateral tube is completely sealed.

6. The acoustic attenuation structure of claim 4 , wherein at least one of the first axial tube, the second axial tube, the first lateral tube, the second lateral tube, the third lateral tube or the fourth lateral tube is completely sealed via a wall configured to block a flow of fluid therethrough.

7. The acoustic attenuation structure of claim 4 , wherein at least one of the first axial tube, the second axial tube, the first lateral tube, the second lateral tube, the third lateral tube or the fourth lateral tube is partially sealed.

8. The acoustic attenuation structure of claim 4 , wherein at least one of the first axial tube, the second axial tube, the first lateral tube, the second lateral tube, the third lateral tube or the fourth lateral tube is partially sealed via a mesh configured to partially restrict a flow of fluid therethrough.

9. The acoustic attenuation structure of claim 2 , wherein the first lateral tube of the first unit cell is interconnected to at least one of the first lateral tube or the second lateral tube of the second unit cell.

10. The acoustic attenuation structure of claim 9 , further comprising a third unit cell interconnected to the first unit cell and a fourth unit cell interconnected to the second unit cell and to the third unit cell.

11. The acoustic attenuation structure of claim 10 , wherein each of the first unit cell, the second unit cell, the third unit cell and the fourth unit cell are comprised within a layer of unit cells.

12. The acoustic attenuation structure of claim 11 , wherein a plurality of holes defines a space exterior to the first unit cell, the second unit cell, the third unit cell and the fourth unit cell, the space being at least partially restricted by the hole mesh.

13. The acoustic attenuation structure of claim 12 , wherein the layer of unit cells is one of a plurality of layers of unit cells.

14. The acoustic attenuation structure of claim 13 , further comprising a facesheet having a plurality of perforations in fluid communication with the layer of unit cells.

15. A noise attenuation panel, comprising:
a first periodic structure having a first unit cell, a second unit cell, a third unit cell and a fourth unit cell, wherein each of the first unit cell, the second unit cell, the third unit cell and the fourth unit cell includes a central body interconnected via a plurality of lateral tubes extending from the central body, the first periodic structure forming a first lateral layer of unit cells, wherein a plurality of holes defines a space exterior to each of the first unit cell, the second unit cell, the third unit cell and the fourth unit cell, the space being at least partially restricted by a hole mesh and
a facesheet and a back plate configured to enclose the first periodic structure.

16. The noise attenuation panel of claim 15 , further comprising a second periodic structure, the second periodic structure forming a second lateral layer of unit cells interconnected to the first lateral layer of unit cells.

17. The noise attenuation panel of claim 16 , wherein the second lateral layer of unit cells is interconnected to the first lateral layer of unit cells via a plurality of axial tubes.

18. The noise attenuation panel of claim 17 , wherein the first lateral layer of unit cells and the second lateral layer of unit cells each comprise a plurality of holes extending axially between adjacent pairs of unit cells that comprise the first lateral layer of unit cells and the second lateral layer of unit cells and wherein the plurality of holes defines a space exterior to the first lateral layer of unit cells, the space being either partially restricted or completely restricted by a hole mesh.

19. The noise attenuation panel of claim 18 , wherein the facesheet includes a plurality of perforations in fluid communication with the first lateral layer of unit cells and wherein one or more unit cells comprised within an Nth layer of unit cells is spaced a gap from the back plate.

Assignees

• Goodrich Corp

Inventors

• Winkler Julian
• Homma Kenji
• Reimann Craig Aaron
• Mendoza Jeffrey Michael

Classifications

• G10K11/172 Primary

  using resonance effects · CPC title

• B64C1/40

  Sound or heat insulation {, e.g. using insulation blankets} · CPC title

• E04B1/86

  slab-shaped · CPC title

• G10K11/162 Primary

  Selection of materials · CPC title

• B64C1/066

  Interior liners · CPC title