Acoustic treatment panel comprising cells which each contain a plurality of conduits

Patent metadata

Field	Value
Publication number	US-10940935-B2
Application number	US-201815961316-A
Country	US
Kind code	B2
Filing date	Apr 24, 2018
Priority date	Apr 25, 2017
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

An acoustic treatment panel in which each cell includes a plurality of conduits which extend from the porous acoustically resistive structure to the reflective layer of the acoustic treatment panel, each conduit including at least one opening set away from the porous acoustically resistive structure and configured to cause the inside and the outside of the conduit to communicate.

First claim

The invention claimed is:

1. An acoustic treatment panel comprising:
a porous acoustically resistive structure in contact with an external environment in which during operation sound waves travel;
a reflective layer and at least one cellular structure positioned between the porous acoustically resistive structure and the reflective layer and configured to compartmentalize a zone between the porous acoustically resistive structure and the reflective layer into a plurality of cells; and
each of the plurality of cells containing several conduits, each of which has a first end closed off by a portion of the porous acoustically resistive structure, a second end closed off by a portion of the reflective layer, and at least one opening set away from the porous acoustically resistive structure and configured to cause an inside and an outside of the conduit to communicate.

2. The acoustic treatment panel according to claim 1 , wherein a ratio between a cross section of the cell and a cross section of a conduit is greater than or equal to 10, or greater than 20.

3. The acoustic treatment panel according to claim 2 , wherein each conduit has a cross section less than or equal to 0.04 cm 2 .

4. The acoustic treatment panel according to claim 1 , wherein each conduit has a cross section that is constant between the first and second ends.

5. The acoustic treatment panel according to claim 1 , wherein the conduits are rigid.

6. The acoustic treatment panel according to claim 1 , wherein each conduit comprises a single opening which takes a form of a slot which comprises a longest dimension oriented parallel to an axis of the conduit.

7. The acoustic treatment panel according to claim 6 , wherein openings of all the conduits of one same cell are identical and extend from the reflective layer over a length of an order of one third of a total length of the conduits.

8. The acoustic treatment panel according to claim 1 , wherein the cells are defined by partitions oriented in a first direction and in a second direction perpendicular to the first direction and wherein, in each cell, the conduits are positioned along lines parallel to the first direction and along rows parallel to the second direction.

9. The acoustic treatment panel according to claim 1 , wherein each conduit has a circular cross section with a diameter of between 0.5 and 2 mm.

10. An aircraft comprising an acoustic treatment panel, comprising:
a porous acoustically resistive structure in contact with an external environment in which during operation sound waves travel;
a reflective layer and at least one cellular structure positioned between the porous acoustically resistive structure and the reflective layer and configured to compartmentalize a zone between the porous acoustically resistive structure and the reflective layer into a plurality of cells; and
each of the plurality of cells containing several conduits, each of which has a first end closed off by a portion of the porous acoustically resistive structure, a second end closed off by a portion of the reflective layer, and at least one opening set away from the porous acoustically resistive structure and configured to cause an inside and an outside of the conduit to communicate.

Assignees

• Airbus Operations Sas

Inventors

• Porte Alain
• Lalane Jacques
• Lavieille Maud

Classifications

• B64C1/40 Primary

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

• B64D29/06 Primary

  Attaching of nacelles, fairings or cowlings · CPC title

• B64D2033/0206

  comprising noise reduction means, e.g. acoustic liners · CPC title

• F02C7/045

  having provisions for noise suppression · CPC title

• B32B2307/102

  Insulating · CPC title