Acoustic panel with angled corrugated core structures

Patent metadata

Field	Value
Publication number	US-9761216-B2
Application number	US-201615040637-A
Country	US
Kind code	B2
Filing date	Feb 10, 2016
Priority date	Feb 10, 2016
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A panel is provided for attenuating noise. This panel includes a first skin, a second skin and a core, which forms a plurality of cavities vertically between the first skin and the second skin. The core includes a first wall, a second wall, a first baffle, a second baffle and a first septum. The cavities include a first cavity formed laterally between the first wall and the second wall and longitudinally between the first baffle and the second baffle. The first septum is longitudinally between the first baffle and the second baffle and divides the first cavity into fluidly coupled sub-cavities. The first septum is angularly offset from the first wall by an acute angle. One or more perforations in the first skin are fluidly coupled with the first cavity.

First claim

We claim:

1. A panel for attenuating noise, comprising:
a first skin;
a second skin; and
a core forming a plurality of cavities vertically between the first skin and the second skin, the core including a first wall, a second wall, a first baffle, a second baffle and a first septum;
the cavities including a first cavity formed laterally between the first wall and the second wall and longitudinally between the first baffle and the second baffle; and
the first septum longitudinally between the first baffle and the second baffle and dividing the first cavity into fluidly coupled sub-cavities;
wherein the first septum is angularly offset from the first wall by an acute angle;
wherein one or more perforations in the first skin are fluidly coupled with the first cavity; and
wherein the first baffle, the second baffle and the first septum each extends between and is connected to the first wall and the second wall.

2. The panel of claim 1 , wherein the first septum is connected to the first baffle and the second baffle.

3. The panel of claim 1 , wherein the first septum is angularly offset from the first skin by an acute angle.

4. The panel of claim 1 , wherein
the core further includes a third wall, a third baffle, a fourth baffle and a second septum;
the cavities further include a second cavity formed laterally between the first wall and the third wall and longitudinally between the third baffle and the fourth baffle;
the second septum is longitudinally between the third baffle and the fourth baffle and divides the second cavity into fluidly coupled sub-cavities;
the second septum is angularly offset from the first wall by an acute angle; and
one or more perforations in the first skin are fluidly coupled with the second cavity.

5. The panel of claim 4 , wherein the acute angle between the second septum and the first wall is equal to the acute angle between the first septum and the first wall.

6. The panel of claim 4 , wherein an intersection between the first septum and the first baffle at the first wall is longitudinally aligned with an intersection between the second septum and the third baffle at the first wall.

7. The panel of claim 4 , wherein an intersection between the first septum and the first baffle at the first wall is longitudinally offset from an intersection between the second septum and the third baffle at the first wall.

8. The panel of claim 4 , wherein an intersection between the first septum and the first baffle at the first wall is approximately longitudinally centered between
an intersection between the second septum and the third baffle at the first wall; and
an intersection between the second septum and the fourth baffle at the first wall.

9. The panel of claim 1 , wherein
the core further includes a third baffle and a second septum;
the cavities further include a second cavity formed laterally between the first wall and the second wall and longitudinally between the first baffle and the third baffle;
the second septum is longitudinally between the first baffle and the third baffle and divides the second cavity into fluidly coupled sub-cavities;
the second septum is angularly offset from the first wall by an acute angle; and
one or more perforations in the first skin are fluidly coupled with the second cavity.

10. The panel of claim 9 , wherein the acute angle between the second septum and the first wall is equal to the acute angle between the first septum and the first wall.

11. The panel of claim 1 , wherein the panel is configured as a component of an aircraft propulsion system.

12. A panel for attenuating noise, comprising:
a first skin;
a second skin; and
a core forming a plurality of cavities vertically between the first skin and the second skin, the core including a first wall, a second wall, a first baffle, a second baffle and a first septum;
the cavities including a first cavity formed laterally between the first wall and the second wall and longitudinally between the first baffle and the second baffle; and
the first septum longitudinally between the first baffle and the second baffle and dividing the first cavity into fluidly coupled sub-cavities;
wherein the first septum is angularly offset from the first wall by an acute angle;
wherein one or more perforations in the first skin are fluidly coupled with the first cavity; and
wherein the first baffle and the second baffle are angularly offset from the first wall by an acute angle.

13. A panel for attenuating noise, comprising:
a first skin;
a second skin; and
a core forming a plurality of cavities vertically between the first skin and the second skin, the core including a first wall, a second wall, a first baffle, a second baffle and a first septum;
the cavities including a first cavity formed laterally between the first wall and the second wall and longitudinally between the first baffle and the second baffle; and
the first septum longitudinally between the first baffle and the second baffle and dividing the first cavity into fluidly coupled sub-cavities;
wherein the first septum is angularly offset from the first wall by an acute angle;
wherein one or more perforations in the first skin are fluidly coupled with the first cavity; and
wherein the first septum is perpendicular to the first skin.

14. A panel for attenuating noise, comprising:
a first skin;
a second skin; and
a core forming a plurality of cavities vertically between the first skin and the second skin, the core including a first wall, a second wall, a first baffle, a second baffle and a first septum;
the cavities including a first cavity formed laterally between the first wall and the second wall and longitudinally between the first baffle and the second baffle; and
the first septum longitudinally between the first baffle and the second baffle and dividing the first cavity into fluidly coupled sub-cavities;
wherein the first septum is angularly offset from the first wall by an acute angle;
wherein one or more perforations in the first skin are fluidly coupled with the first cavity; and
wherein the first baffle is angularly offset from the first skin by an acute angle.

15. A panel for attenuating noise, comprising:
a first skin;
a second skin; and
a core forming a plurality of cavities vertically between the first skin and the second skin, the core including a first wall, a second wall, a plurality of baffles and a plurality of septums interdisposed with the baffles to provide a corrugated structure;
the cavities including a first cavity formed laterally between the first wall and the second wall and longitudinally between a first of the baffles and a second of the baffles; and
a first of the septums longitudinally between the first of the baffles and the second of the baffles and dividing the first cavity into fluidly coupled sub-cavities;
wherein the first of the septums is angularly offset from the first wall by an acute angle; and
wherein one or more perforations in the first skin are fluidly coupled with the first cavity.

16. The panel of claim 15 , wherein the first of the baffles and the second of the baffles are angularly offset from the first wall by an acute angle, and the first of the baffles and the second of the baffles are angularly offset from the first skin by an acute angle.

17. The panel of claim 15 , wherein
the first of the septums is connected to the first of the baffles and the second of the baffles; and
the first of the baffles, the second of the baffles and the first of the septums each extends between and is connected to the first wall

Assignees

• Rohr Inc

Inventors

• Nampy Sreenivas Narayanan
• Adams David M

Classifications

• G10K11/175

  using interference effects; Masking sound · CPC title

• G10K11/161

  in systems with fluid flow (G10K11/162 takes precedence; gas flow silencers or exhaust apparatus for machines or engines in general or for internal combustion engine F01N, noise absorbers in pipes or pipe systems F16L55/02; noise absorption in air conditioning and ventilation F24F13/24; silencing exhaust or propulsion jets in aircraft B64D33/06) · CPC title

• G10K11/28

  using reflection, e.g. parabolic reflectors · CPC title

• F02C7/24

  Heat or noise insulation (air intakes having provisions for noise suppression F02C7/045; turbine exhaust heads, chambers, or the like F01D25/30; silencing nozzles of jet-propulsion plants F02K1/00) · CPC title

• G10K11/172 Primary

  using resonance effects · CPC title