SOUND ABSORBING DEVICE FOR ULTRA-LOW FREQUENCY SOUND

Title:

SOUND ABSORBING DEVICE FOR ULTRA-LOW FREQUENCY SOUND

Document Type and Number:

WIPO Patent Application WO/2005/116990

Kind Code:

A1

Abstract:

A sound absorbing device which effectively suppresses ultra-low frequency noise by using a more simplified arrangement, particularly a sound absorbing device which reduces ultra-low frequency noises of 1 - 20Hz generated in an inner space in an engine test cell, an engine runup hanger or the like. It comprises a porous layer (11), a rear air layer (12), and a wall surface (13), wherein the porous layer is disposed on the side opposed to an ultra-low frequency sound source and a rear air layer having a thickness of 2 - 10m is formed between the porous layer and the wall surface. Particularly it is preferable that the surface density of the porous layer is in the range of 0.5 - 10kg/m².

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Inventors:

AOKI MAKOTO (JP)
ODA MITSUAKI (JP)
SATOMI TAKAYUKI (JP)

Application Number:

PCT/JP2005/004781

Publication Date:

December 08, 2005

Filing Date:

March 17, 2005

Export Citation:

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Assignee:

KAWASAKI HEAVY IND LTD (JP)
AOKI MAKOTO (JP)
ODA MITSUAKI (JP)
SATOMI TAKAYUKI (JP)

International Classes:

E04B1/82; B64F1/26; G01M9/00; G01M15/00; G01M15/14; G10K11/16; G10K11/172; (IPC1-7): G10K11/16; B64F1/26; G01M15/00; G10K11/172

Foreign References:

JP2004052274A	2004-02-19
JPH07168577A	1995-07-04
JPH05289673A	1993-11-05
JP2002073036A	2002-03-12
JP2001306080A	2001-11-02
JP2000318696A	2000-11-21
JPS5847700A	1983-03-19
JPH086569A	1996-01-12
JPH09111906A	1997-04-28
JPH11351609A	1999-12-24
JPH03125704A	1991-05-29
JP2003058168A	2003-02-28

Other References: