Noise attenuating acoustic panel

Patent metadata

Field	Value
Publication number	US-2016017775-A1
Application number	US-201514804631-A
Country	US
Kind code	A1
Filing date	Jul 21, 2015
Priority date	Jul 21, 2014
Publication date	Jan 21, 2016
Grant date	—

Abstract

An acoustic panel is provided that includes a first layer, a perforated second layer, a core and a noise attenuating feature. The core forms a chamber between the first and the second layers. The noise attenuating feature projects partially into the chamber. The noise attenuating feature is formed integral with the first layer, the second layer and/or the core.

First claim

What is claimed is:

1 . An acoustic panel, comprising:
a first layer; a perforated second layer; a core forming a chamber between the first and the second layers; and a noise attenuating feature projecting partially into the chamber, the noise attenuating feature formed integral with at least one of the first layer, the second layer or the core.

2 . The acoustic panel of claim 1 , wherein the noise attenuating feature comprises a baffle.

3 . The acoustic panel of claim 1 , wherein the noise attenuating feature comprises a muffler.

4 . The acoustic panel of claim 1 , wherein
the noise attenuating feature comprises a tube; and the tube is fluidly coupled between a perforation in the second layer and the chamber.

5 . The acoustic panel of claim 4 , wherein a sidewall of the tube is perforated.

6 . The acoustic panel of claim 1 , wherein the noise attenuating feature is configured as a cone or a pyramid.

7 . The acoustic panel of claim 1 , wherein
the noise attenuating feature is one of a plurality of noise attenuating features projecting partially into the chamber; and each of the noise attenuating features is formed integral with at least one of the first layer, the second layer or the core.

8 . The acoustic panel of claim 7 , wherein the noise attenuating features are configured to provide at least a portion of a surface, which defines at least a portion of the chamber, with a surface roughness between about 250 Ra and about 2,000 Ra.

9 . The acoustic panel of claim 1 , wherein
the core further forms a second chamber between the first and the second layers; and the chamber and the second chamber are fluidly discrete.

10 . The acoustic panel of claim 1 , wherein
the core further forms a second chamber between the first and the second layers; and the chamber and the second chamber are fluidly coupled through one or more apertures in the core.

11 . The acoustic panel of claim 1 , wherein the core includes one or more protrusions that extend between the first and the second layers through the chamber.

12 . The acoustic panel of claim 1 , wherein the core is formed integral with at least one of the first layer or the second layer.

13 . An apparatus for a turbine engine, the apparatus comprising:
an acoustic panel including a muffler; wherein the muffler is configured internally within the panel and to attenuate noise generated during operation of the turbine engine.

14 . The apparatus of claim 13 , wherein
the acoustic panel further includes a first layer and a perforated second layer; and the muffler extends between the first and the second layers;

15 . The apparatus of claim 13 , wherein the muffler comprises a plurality of baffles configured to form a plurality of chambers within the acoustic panel.

16 . The apparatus of claim 15 , wherein at least some of the baffles are interconnected by one or more webs.

17 . The apparatus of claim 13 , wherein
the muffler comprises one or more tubes; and each of the one or more tubes is fluidly coupled with a respective perforation in the acoustic panel.

18 . The apparatus of claim 17 , wherein the acoustic panel includes one or more internal canted surfaces positioned opposite an orifice of each of the one or more tubes.

19 . A manufacturing method, comprising:
forming an acoustic panel, the acoustic panel comprising a noise attenuating feature that projects partially into an internal chamber of the acoustic panel; wherein at least the noise attenuating feature is formed using an additive manufacturing system.

20 . The manufacturing method of claim 19 , wherein the acoustic panel is formed as a unitary body using the additive manufacturing system.

Assignees

• United Technologies Corp

Inventors

• Mattia Stephen H

Classifications

• F01N1/082 Primary

  by passing the exhaust gases through porous members · CPC title

• F05D2250/63

  coarse · CPC title

• F05D2260/963

  by Helmholtz resonators · CPC title

• F02K1/827 Primary

  Sound absorbing structures or liners · CPC title

• F02C7/045

  having provisions for noise suppression · CPC title