Sound absorbing structure for anechoic chamber and anechoic chamber including the same

Patent metadata

Field	Value
Publication number	US-2018240451-A1
Application number	US-201715590560-A
Country	US
Kind code	A1
Filing date	May 9, 2017
Priority date	Feb 17, 2017
Publication date	Aug 23, 2018
Grant date	—

Abstract

This technology provides a sound absorbing structure comprising: an outer frame including an opening; a perforated plate member formed in the outer frame and including a rear surface facing the opening of the outer frame and a front surface opposite to the rear surface; and a rear sound absorber interposed between the rear surface of the perforated plate member and the opening of the outer frame, and an anechoic chamber comprising: a wall, a ceiling and a floor; and a plurality of sound absorbing structures of the embodiment fixed to at least the wall and the ceiling.

First claim

What is claimed is:

1 . A sound absorbing structure comprising:
an outer frame including an opening; a perforated plate member formed in the outer frame and including a rear surface facing the opening of the outer frame and a front surface opposite to the rear surface; and a rear sound absorber interposed between the rear surface of the perforated plate member and the opening of the outer frame.

2 . The sound absorbing structure of claim 1 , further comprising a front sound absorber interposed between the front surface of the perforated plate member and the outer frame.

3 . The sound absorbing structure of claim 2 , wherein the front sound absorber comprises a porous sound absorber.

4 . The sound absorbing structure of claim 3 , wherein the porous sound absorber comprises one or more selected from the group consisting of an inorganic fiber, an organic fiber, a chemical fiber, a foamed resin material and a sprayed fiber material.

5 . The sound absorbing structure of claim 2 , wherein the front sound absorber has a thickness greater than 0 mm and up to 350 mm.

6 . The sound absorbing structure of claim 2 , further comprising a protective layer surrounding the front sound absorber.

7 . The sound absorbing structure of claim 1 , wherein the rear sound absorber comprises a porous sound absorber.

8 . The sound absorbing structure of claim 7 , wherein the rear sound absorber comprises one or more selected from the group consisting of an inorganic fiber, an organic fiber, a chemical fiber, a foamed resin material and a sprayed fiber material.

9 . The sound absorbing structure of claim 1 , wherein the rear sound absorber has a thickness of 50 to 250 mm.

10 . The sound absorbing structure of claim 1 , further comprising a protective layer surrounding the rear sound absorber.

11 . The sound absorbing structure of claim 1 , wherein the perforated plate member comprises one or more selected from the group consisting of a metal plate, a gypsum board, an asbestos cement board, a hard board, plywood, a wood wool board and a synthetic resin plate.

12 . The sound absorbing structure of claim 1 , wherein the perforated plate member has a ratio of a total area of pores to an area of the plate of 1 to 15%.

13 . The sound absorbing structure of claim 1 , wherein the perforated plate member further comprises a cap for holding a pore height, wherein the cap for holding the pore height has a hollow shape and has a height which is equal to or greater than the pore height.

14 . The sound absorbing structure of claim 1 , wherein the outer frame comprises a porous plate in which pores are formed in the plate.

15 . The sound absorbing structure of claim 1 , wherein the outer frame has a ratio of a total area of pores to an area of the plate of 30 to 50%.

16 . The sound absorbing structure of claim 1 , wherein the sound absorbing structure has a plate shape.

17 . The sound absorbing structure of claim 1 , wherein the perforated plate member absorbs sound due to resonance caused by vibration of the plate.

18 . An anechoic chamber comprising:
a wall, a ceiling and a floor; and a plurality of sound absorbing structures of claim 1 fixed to at least the wall and the ceiling.

19 . The anechoic chamber of claim 18 , wherein the plurality of sound absorbing structures are fixed to all of the wall, the ceiling and the floor.

Assignees

• S I Pan
• Korea Res Inst Standards & Sci

Inventors

• Jeong Gab Cheol
• Ahn Eon Mo
• Park Jong Young
• Jung Sung Soo

Classifications

• E04B1/86 Primary

  slab-shaped · CPC title

• G10K11/168 Primary

  Plural layers of different materials, e.g. sandwiches · CPC title

• B32B15/20

  comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)} · CPC title

• E04B2001/8419

  Acoustical cones or the like, e.g. for anechoic chambers · CPC title

• B32B2262/0276

  Polyester fibres · CPC title