Multi-degree of freedom acoustic panel

Patent metadata

Field	Value
Publication number	US-2017167291-A1
Application number	US-201514964086-A
Country	US
Kind code	A1
Filing date	Dec 9, 2015
Priority date	Dec 9, 2015
Publication date	Jun 15, 2017
Grant date	—

Abstract

A panel is provided for attenuating noise. This panel includes a first skin, a second skin and a cellular core. The cellular core may be connected to and form a plurality of cavities between the first skin and the second skin. The cellular core may include a wall and a septum. The cavities may include a first cavity and a second cavity. The septum may fluidly divide the first cavity into a first sub-cavity and a second sub-cavity. One or more perforations in the first skin may be fluidly coupled with the first sub-cavity. One or more perforations in the wall may fluidly couple the first sub-cavity with at least a region of the second cavity.

First claim

1 . A panel for attenuating noise, comprising:
a first skin; a second skin; and a cellular core connected to and forming a plurality of cavities between the first skin and the second skin, the cellular core including a wall and a septum, the cavities including a first cavity and a second cavity, and the septum fluidly dividing the first cavity into a first sub-cavity and a second sub-cavity; wherein a plurality of perforations in the first skin are fluidly coupled with the first sub-cavity, and a plurality of perforations in the wall fluidly couple the first sub-cavity with at least a region of the second cavity.

2 . The panel of claim 1 , wherein
the cellular core is vertically between the first skin and the second skin; and the wall is laterally between and partially forms the first cavity and the second cavity.

3 . The panel of claim 2 , wherein
the cellular core further includes a second septum fluidly dividing the second cavity into a first sub-cavity and a second sub-cavity; and the plurality of perforations in the wall fluidly couple the first sub-cavity of the first cavity with the second sub-cavity of the second cavity.

4 . The panel of claim 3 , wherein
the first sub-cavity of the first cavity is vertically between the first skin and the second sub-cavity of the first cavity; and the first sub-cavity of the second cavity is vertically between the first skin and the second sub-cavity of the second cavity.

5 . The panel of claim 3 , wherein at least the first sub-cavity of the first cavity and the second sub-cavity of the second cavity form a diagonally extending chamber within the cellular core.

6 . The panel of claim 3 , wherein
the cavities further include a third cavity; the cellular core further includes a second wall laterally between and partially forming the second cavity and the third cavity; and a plurality of perforations in the second wall fluidly couple the second sub-cavity of the second cavity with at least a region of the third cavity.

7 . The panel of claim 1 , wherein the septum is connected to the wall, and the septum is offset from the wall by an acute angle.

8 . The panel of claim 1 , wherein
the cavities further include a third cavity; and the cellular core further includes a second wall that partially forms and laterally fluidly divides the first cavity and the third cavity.

9 . The panel of claim 1 , wherein the cellular core comprises a honeycomb structure that includes the wall.

10 . The panel of claim 1 , wherein the cellular core comprises an open cavity structure that includes the wall.

11 . The panel of claim 1 , wherein each of the cavities extends from the first skin to the second skin.

12 . The panel of claim 1 , wherein the first cavity has a polygonal cross-sectional geometry.

13 . The panel of claim 1 , wherein the cellular core is bonded to the first skin and the second skin.

14 . The panel of claim 1 , wherein the first skin comprises at least one of composite material, metal or a polymer.

15 . The panel of claim 1 , wherein the cellular core comprises at least one of composite material, metal or a polymer.

16 . A panel for attenuating noise, comprising:
a first skin; a second skin; an open cavity structure connected to the first skin and the second skin, the open cavity structure including a plurality of walls configured to form a plurality of cavities that extend vertically between the first skin and the second skin, wherein the cavities include a first cavity and a second cavity, and the walls include a first wall laterally between and partially for the first cavity and the second cavity; and a plurality of septums respectively disposed within the cavities, each of the septums vertically between and fluidly dividing a respective one of the cavities into a first sub-cavity and a second sub-cavity; wherein the first sub-cavity of the first cavity is fluidly coupled with one or more apertures in the first skin, and fluidly coupled with the second sub-cavity of the second cavity through a plurality of apertures in the first wall.

17 . The panel of claim 16 , further comprising:
a plurality of second septums respectively disposed within the cavities, each of the second septums further fluidly dividing a respective one of the cavities into a third sub-cavity and vertically between the second sub-cavity and the third sub-cavity; wherein the cavities further include a third cavity, and the walls further include a second wall laterally between and partially forming the second cavity and the third cavity; and wherein the second sub-cavity of the second cavity is fluidly coupled with the third sub-cavity of the third cavity though a plurality of apertures in the second wall.

18 . The panel of claim 16 , wherein a first of the septums is connected to and arranged at an acute angle with the first wall.

19 . The panel of claim 16 , wherein at least the first sub-cavity of the first cavity and the second sub-cavity of the second cavity provide a chamber adapted for attenuating noise waves.

20 . A panel for attenuating noise, comprising:
a first skin; a second skin; an open cavity structure connected to the first skin and the second skin, the open cavity structure including a plurality of walls configured to form a plurality of cavities vertically between the first skin and the second skin, wherein the cavities include a first cavity and a second cavity, and the walls include a first wall laterally between and partially forming the first cavity and the second cavity; and a plurality of septums respectively disposed within the cavities, the septums including a first septum vertically between and fluidly dividing the first cavity into a first sub-cavity and a second sub-cavity; wherein the first sub-cavity is fluidly coupled with one or more apertures in the first skin, and fluidly coupled with at least a region of the second cavity through a plurality of apertures in the first wall.

Assignees

• Rohr Inc

Inventors

• Koroly Christopher C

Classifications

• F01D25/24

  Casings (modified for heating or cooling F01D25/14); Casing parts, e.g. diaphragms, casing fastenings (casings for rotary machines or engines in general F16M {; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045}) · CPC title

• F01D25/04 Primary

  Antivibration arrangements · CPC title

• F05D2250/283

  honeycomb · CPC title

• F05D2260/96

  Preventing, counteracting or reducing vibration or noise · CPC title

• F05D2220/323

  for aircraft propulsion, e.g. jet engines · CPC title