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US20040154861A1 - Soundproofing panel - Google Patents

Soundproofing panel Download PDF

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Publication number
US20040154861A1
US20040154861A1 US10/756,993 US75699304A US2004154861A1 US 20040154861 A1 US20040154861 A1 US 20040154861A1 US 75699304 A US75699304 A US 75699304A US 2004154861 A1 US2004154861 A1 US 2004154861A1
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US
United States
Prior art keywords
panel according
wall
flexible
frame
panel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/756,993
Inventor
Michel Pompei
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hutchinson SA
Original Assignee
Hutchinson SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hutchinson SA filed Critical Hutchinson SA
Assigned to HUTCHINSON reassignment HUTCHINSON ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: POMPEI, MICHEL
Publication of US20040154861A1 publication Critical patent/US20040154861A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F3/00—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic
    • F16F3/08—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of a material having high internal friction, e.g. rubber
    • F16F3/087—Units comprising several springs made of plastics or the like material
    • F16F3/093—Units comprising several springs made of plastics or the like material the springs being of different materials, e.g. having different types of rubber
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/86—Sound-absorbing elements slab-shaped

Definitions

  • the present invention relates to a soundproofing panel comprising an “exciter” wall for coming into contact with a fluid in which there is a source of noise, and a “receiver” wall for coming into contact with a fluid in which it is desired to attenuate the noise, together with a sound-absorbing intermediate element disposed between the two walls.
  • the intermediate wall is often constituted by a sheet of rubber interposed between two layers of absorbent material, said assembly being sandwiched between the exciter and receiver walls.
  • the present invention is based on the idea of suspending the intermediate wall elastically from the receiver wall.
  • the intermediate wall is not linked directly to the receiver wall, thereby improving performance.
  • the intermediate wall in association with the exciter wall constitutes a system of two suspended masses which present a better filtering effect, thereby enabling the panel to provide better soundproofing, at least in a band of frequencies.
  • the invention provides a soundproofing panel comprising an “exciter” wall for putting into contact with a fluid containing a source of noise and a receiver wall for putting into contact with a fluid in which the noise is to be attenuated, the panel further comprising at least one intermediate element between said walls and the intermediate element comprises over at least a portion of its outline at least one element providing elastic coupling between the intermediate element and only the receiver wall.
  • At least one said flexible element may be a suspension stud of flexible material, in particular of elastomer material. It may also be a flexible wall, in particular an elastomer wall, constituted by one or more segments extending over at least a portion of the outline of the intermediate wall.
  • the intermediate element may be constituted by wall, e.g. a sheet, in particular an elastomer sheet or an elastomer and metal foil sheet interposed between two layers of sound-absorbing material, the assembly comprising the sheet and the layers of absorbent material being sandwiched between the exciter and receiver walls.
  • wall e.g. a sheet, in particular an elastomer sheet or an elastomer and metal foil sheet interposed between two layers of sound-absorbing material, the assembly comprising the sheet and the layers of absorbent material being sandwiched between the exciter and receiver walls.
  • One or more flexible material suspension studs may be disposed along the perimeter of the sheet.
  • the panel may include a rigid frame secured to the receiver wall of the intermediate sheet, at least one flexible element being fixed between the frame and the intermediate element, e.g. being interposed between the frame and the intermediate element, or indeed between the outline of an opening in the frame and the periphery of the intermediate element.
  • the panel may include a rigid frame secured to the intermediate element, at least one said flexible element being fixed between the frame and the receiver wall.
  • At least one flexible element may be a flexible material suspension stud, or a flexible wall made up of one or more segments extending over at least a portion of the perimeter of an opening in the rigid frame.
  • the rigid frame may be made of a material of the honeycomb type presenting an array of cells, in particular hexagonal cells, sandwiched between two rigid plates.
  • the inside of the frame defines a cavity which may be filled at least in part with a sound-absorbing material, e.g. glass wool.
  • the rigid frame presents one or more openings and the panel includes an intermediate element which covers at least the outer outline of the rigid frame.
  • the rigid frame presents a plurality of openings and the panel has a plurality of intermediate elements each covering one or more openings in the rigid frame.
  • At least one said opening may be filled with sound-absorbing material.
  • FIGS. 1 and 2 show two embodiments of a first variant of the invention
  • FIG. 3 shows a second variant of the invention
  • FIG. 3 a being a section on AA of FIG. 3,
  • FIG. 3 b being a variant of FIG. 3 a ;
  • FIGS. 4 a and 4 b show two variant embodiments of the invention, both including a frame with a plurality of openings.
  • a composite soundproofing panel comprises an exciter wall 1 disposed on a side where exciter soundwaves (represented by arrows) exist in a fluid 6 , and a receiver wall 2 disposed on its opposite side in contact with a fluid 7 in which it is desired to attenuate noise.
  • the receiver panel 2 is rigid or semi-rigid. In the invention, it may also be a flexible wall, e.g. a sheet of rubber.
  • An intermediate wall ( 3 , 4 , 5 ) is sandwiched between the exciter 1 and the receiver wall 2 and comprises in succession a first layer 4 of sound-absorbing material which may be fixed to the exciter wall 1 , e.g. by adhesive, an intermediate sheet 3 , and a second layer 5 of sound-absorbing material which may be fixed to the receiver wall 2 , e.g. by adhesive.
  • the sheet or plate 3 may be made of flexible or semi-rigid rubber or it may comprise a rubber and metal foil composite. It may be secured to both sound-absorbing layers 4 and 5 , e.g. by adhesive.
  • the sheet 3 is suspended from the receiver wall 2 by one or more flexible links, e.g. studs 8 .
  • the intermediate wall is not suspended by a direct link to the receiver wall 5 .
  • a rigid frame 10 is used that is secured to the receiver wall 2 and the intermediate sheet or plate 3 is elastically connected to the frame 10 , e.g. by a system of elastic studs 8 or via at least one flexible wall 12 .
  • This flexible wall 12 is fixed to the inner periphery of the frame 10 (by a system of screws and washers or by spots of adhesive), and to the periphery of the intermediate plate 3 .
  • the assembly comprising the wall 2 , the frame 10 , and the intermediate plate 3 constitutes a cavity which can be filled with sound-absorbing material constituting the layer 5 .
  • studs 8 are disposed between the intermediate plate 3 and the frame 10 which is secured to the wall 2 , or else studs 8 (or indeed one or more flexible strips) are disposed between the wall 2 and the frame 10 which is secured to the intermediate plate 3 .
  • the intermediate wall 3 may be flexible, semi-rigid, or rigid.
  • the frame 10 is designed to have sufficient stiffness and, by way of example, it can be made of a rigid material such as a honeycomb material with an array of cells, e.g. hexagonal cells, sandwiched between two rigid plates.
  • a rigid material such as a honeycomb material with an array of cells, e.g. hexagonal cells, sandwiched between two rigid plates.
  • the elasticity provided by the studs 8 (or by the flexible wall(s) 12 fixed to the frame 10 ) and also the elasticity of the layers 4 and 5 constitute mass-spring coupling parameters between the intermediate wall 3 and the receiver wall 2 .
  • the elasticity of the studs 8 or of the flexible wall(s) 12 determines the range of frequencies in which the desired effect is obtained.
  • the frame 10 may have a plurality of openings, e.g. an array of openings 15 as shown in FIGS. 4 a and 4 b .
  • FIG. 4 a there is a single intermediate plate 3 which covers the frame 10 and thus covers its openings.
  • FIG. 4 b there are a plurality of intermediate plates 3 , e.g. one intermediate plate 3 per opening.
  • At least one opening 15 may be filled with sound-absorbing material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Building Environments (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)

Abstract

The invention relates to a soundproofing panel comprising an “exciter” wall for putting into contact with a fluid in which there is a source of noise, and a “receiver” wall for putting into contact with a fluid in which it is desired to attenuate noise, the panel including between said two walls an intermediate element. In the panel, the intermediate element is held on at least a portion of its outline by means of at least one flexible element disposed between the intermediate wall and the receiver wall.

Description

  • The present invention relates to a soundproofing panel comprising an “exciter” wall for coming into contact with a fluid in which there is a source of noise, and a “receiver” wall for coming into contact with a fluid in which it is desired to attenuate the noise, together with a sound-absorbing intermediate element disposed between the two walls. [0001]
    • BACKGROUND OF THE INVENTION
  • In the prior art, the intermediate wall is often constituted by a sheet of rubber interposed between two layers of absorbent material, said assembly being sandwiched between the exciter and receiver walls. [0002]
  • The drawback of that solution is that it is not easy to adjust the critical frequency of said wall and that the layers of absorbent material must hold said sheet, thereby limiting the materials suitable for use to those which present sufficient mechanical strength. One known solution consists firstly in covering said wall in metal foil of thickness and mass that are adjusted to adjust stiffness and mass per unit area, and secondly in holding the rubber sheet by fixing it by appropriate means to the exciter wall. [0003]
    • OBJECTS AND SUMMARY OF THE INVENTION
  • The present invention is based on the idea of suspending the intermediate wall elastically from the receiver wall. [0004]
  • This provides two advantages. [0005]
  • Firstly, the intermediate wall is not linked directly to the receiver wall, thereby improving performance. [0006]
  • Secondly, the intermediate wall in association with the exciter wall constitutes a system of two suspended masses which present a better filtering effect, thereby enabling the panel to provide better soundproofing, at least in a band of frequencies. [0007]
  • The invention provides a soundproofing panel comprising an “exciter” wall for putting into contact with a fluid containing a source of noise and a receiver wall for putting into contact with a fluid in which the noise is to be attenuated, the panel further comprising at least one intermediate element between said walls and the intermediate element comprises over at least a portion of its outline at least one element providing elastic coupling between the intermediate element and only the receiver wall. [0008]
  • At least one said flexible element may be a suspension stud of flexible material, in particular of elastomer material. It may also be a flexible wall, in particular an elastomer wall, constituted by one or more segments extending over at least a portion of the outline of the intermediate wall. [0009]
  • The intermediate element may be constituted by wall, e.g. a sheet, in particular an elastomer sheet or an elastomer and metal foil sheet interposed between two layers of sound-absorbing material, the assembly comprising the sheet and the layers of absorbent material being sandwiched between the exciter and receiver walls. [0010]
  • One or more flexible material suspension studs may be disposed along the perimeter of the sheet. [0011]
  • The panel may include a rigid frame secured to the receiver wall of the intermediate sheet, at least one flexible element being fixed between the frame and the intermediate element, e.g. being interposed between the frame and the intermediate element, or indeed between the outline of an opening in the frame and the periphery of the intermediate element. [0012]
  • The panel may include a rigid frame secured to the intermediate element, at least one said flexible element being fixed between the frame and the receiver wall. [0013]
  • In either case, at least one flexible element may be a flexible material suspension stud, or a flexible wall made up of one or more segments extending over at least a portion of the perimeter of an opening in the rigid frame. [0014]
  • The rigid frame may be made of a material of the honeycomb type presenting an array of cells, in particular hexagonal cells, sandwiched between two rigid plates. [0015]
  • The inside of the frame defines a cavity which may be filled at least in part with a sound-absorbing material, e.g. glass wool. [0016]
  • In the panel, the rigid frame presents one or more openings and the panel includes an intermediate element which covers at least the outer outline of the rigid frame. [0017]
  • In the panel, the rigid frame presents a plurality of openings and the panel has a plurality of intermediate elements each covering one or more openings in the rigid frame. [0018]
  • At least one said opening may be filled with sound-absorbing material.[0019]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • Other characteristics and advantages of the invention appear on reading the following description given with reference to the drawings, in which: [0020]
  • FIGS. 1 and 2 show two embodiments of a first variant of the invention; [0021]
  • FIG. 3 shows a second variant of the invention, [0022]
  • FIG. 3[0023] a being a section on AA of FIG. 3, and
  • FIG. 3[0024] b being a variant of FIG. 3a; and
  • FIGS. 4[0025] a and 4 b show two variant embodiments of the invention, both including a frame with a plurality of openings.
    • MORE DETAILED DESCRIPTION
  • In FIG. 1, a composite soundproofing panel comprises an exciter wall [0026] 1 disposed on a side where exciter soundwaves (represented by arrows) exist in a fluid 6, and a receiver wall 2 disposed on its opposite side in contact with a fluid 7 in which it is desired to attenuate noise. In general, the receiver panel 2 is rigid or semi-rigid. In the invention, it may also be a flexible wall, e.g. a sheet of rubber.
  • An intermediate wall ([0027] 3, 4, 5) is sandwiched between the exciter 1 and the receiver wall 2 and comprises in succession a first layer 4 of sound-absorbing material which may be fixed to the exciter wall 1, e.g. by adhesive, an intermediate sheet 3, and a second layer 5 of sound-absorbing material which may be fixed to the receiver wall 2, e.g. by adhesive. By way of example, the sheet or plate 3 may be made of flexible or semi-rigid rubber or it may comprise a rubber and metal foil composite. It may be secured to both sound-absorbing layers 4 and 5, e.g. by adhesive. In the invention, the sheet 3 is suspended from the receiver wall 2 by one or more flexible links, e.g. studs 8.
  • As shown in FIG. 2 (fragmentary view), it is possible to make use of conventional [0028] rubber suspension studs 8 between the plate 3 and the receiver wall 2. They could be replaced by a suspension using one or more flexible strips so as to distribute the suspension over a larger area.
  • In the variant shown in FIGS. 3 and 3[0029] a, the intermediate wall is not suspended by a direct link to the receiver wall 5. A rigid frame 10 is used that is secured to the receiver wall 2 and the intermediate sheet or plate 3 is elastically connected to the frame 10, e.g. by a system of elastic studs 8 or via at least one flexible wall 12. This flexible wall 12 is fixed to the inner periphery of the frame 10 (by a system of screws and washers or by spots of adhesive), and to the periphery of the intermediate plate 3. The assembly comprising the wall 2, the frame 10, and the intermediate plate 3 constitutes a cavity which can be filled with sound-absorbing material constituting the layer 5.
  • In the embodiment of FIG. 3[0030] b, studs 8 (or one or more flexible strips) are disposed between the intermediate plate 3 and the frame 10 which is secured to the wall 2, or else studs 8 (or indeed one or more flexible strips) are disposed between the wall 2 and the frame 10 which is secured to the intermediate plate 3. In both cases, the intermediate wall 3 may be flexible, semi-rigid, or rigid.
  • The [0031] frame 10 is designed to have sufficient stiffness and, by way of example, it can be made of a rigid material such as a honeycomb material with an array of cells, e.g. hexagonal cells, sandwiched between two rigid plates.
  • The elasticity provided by the studs [0032] 8 (or by the flexible wall(s) 12 fixed to the frame 10) and also the elasticity of the layers 4 and 5 (generally a compressible material such as fiber glass, felt, or indeed a foam of polyamide, polyimide, polyurethane, or polyethylene) constitute mass-spring coupling parameters between the intermediate wall 3 and the receiver wall 2. The elasticity of the studs 8 or of the flexible wall(s) 12 determines the range of frequencies in which the desired effect is obtained.
  • The [0033] frame 10 may have a plurality of openings, e.g. an array of openings 15 as shown in FIGS. 4a and 4 b. In FIG. 4a there is a single intermediate plate 3 which covers the frame 10 and thus covers its openings.
  • In FIG. 4[0034] b, there are a plurality of intermediate plates 3, e.g. one intermediate plate 3 per opening.
  • At least one opening [0035] 15 may be filled with sound-absorbing material.

Claims (16)

What is claimed is:
1. A soundproofing panel comprising an “exciter” wall for putting into contact with a fluid containing a source of noise and a “receiver” wall for putting into contact with a fluid in which the noise is to be attenuated, the panel further comprising at least one intermediate element between said walls and the intermediate element comprises over at least a portion of its outline at least one element providing elastic coupling between the intermediate element and only the receiver wall.
2. A panel according to claim 1, wherein the element(s) is/are situated only over the outline of the intermediate element or over at least a portion of said outline.
3. A panel according to claim 1, wherein the intermediate element is constituted by a rigid or semi-rigid intermediate plate interposed between said layers of sound-absorbing material, the assembly constituted by the intermediate plate and the two layers of sound-absorbing material being sandwiched between said two walls.
4. A panel according to claim 1, wherein at least one flexible element is a suspension stud made of flexible material, in particular of elastomer material.
5. A panel according to claim 4, including a plurality of suspension studs distributed along the periphery of the intermediate sheet.
6. A panel according to claim 3, wherein at least one flexible element is a strip of flexible material, in particular of elastomer material.
7. A panel according to claim 1, including a rigid frame secured to receiver wall and wherein at least one flexible element is disposed between the frame and the intermediate element.
8. A panel according to claim 7, wherein at least one said flexible element is interposed between the frame and the intermediate element.
9. A panel according to claim 7, wherein at least one said flexible element is fixed between the inner outline of an opening in the frame and the periphery of the intermediate element.
10. A panel according to claim 3, including a rigid frame secured to the intermediate sheet, and wherein at least one said flexible element is fixed between the frame and the receiver wall.
11. A panel according to claim 7, wherein at least one flexible element is a flexible wall made up of one or more segments.
12. A panel according to claim 7, wherein the rigid frame is a cellular array of the honeycomb type presenting an array of cells, in particular hexagonal cells, sandwiched between two rigid plates.
13. A panel according to claim 7, wherein the rigid frame defines an internal cavity which is filled at least in part with soundproofing material.
14. A panel according to claim 7, wherein the rigid frame presents one or more openings, and wherein the panel includes an intermediate element covering at least the outer outline of the rigid frame.
15. A panel according to claim 7, wherein the rigid frame presents a plurality of openings, and wherein the panel comprises a plurality of intermediate elements, each covering one or more openings of the rigid frame.
16. A panel according to claim 14, wherein at least one said opening is filled with sound-absorbing material.
US10/756,993 2003-01-24 2004-01-14 Soundproofing panel Abandoned US20040154861A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0300773 2003-01-24
FR0300773A FR2850410B1 (en) 2003-01-24 2003-01-24 ACOUSTIC INSULATION PANEL

Publications (1)

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US20040154861A1 true US20040154861A1 (en) 2004-08-12

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US (1) US20040154861A1 (en)
EP (1) EP1443154A1 (en)
BR (1) BRPI0400050A (en)
CA (1) CA2455032A1 (en)
FR (1) FR2850410B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040154418A1 (en) * 2003-01-24 2004-08-12 Hutchinson Mechanical structure presenting a modifiable vibratory property
US20080164093A1 (en) * 2005-03-17 2008-07-10 Swcc Showa Device Technology Co., Ltd. Sound Absorbing Material and Structure Using the Same
US20080196968A1 (en) * 2005-09-26 2008-08-21 Airbus Deutschland Gmbh Sound Absorbing Element and Method for Producing a Sound Absorbing Element
US20110108357A1 (en) * 2008-06-25 2011-05-12 Aircelle Acoustic panel for an ejector nozzle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT502932B1 (en) * 2005-08-30 2008-01-15 Friedrich Wieland NOISE WALL
FR3097887B1 (en) * 2019-06-25 2021-07-09 Centre Technique De Materiaux Naturels De Constructions Acoustic and vibratory improvement building module

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US3712846A (en) * 1971-06-23 1973-01-23 Carpenter L & Co Acoustical panel
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US4630416A (en) * 1985-05-09 1986-12-23 Haworth, Inc. Acoustical panel
US4771860A (en) * 1986-08-06 1988-09-20 Siemens Aktiengesellschaft Edge sealing means in a sound-absorbing cover for use in a sound-emitting body
US4849276A (en) * 1984-02-17 1989-07-18 The Boeing Company Thermal insulation structure
US4924969A (en) * 1988-11-09 1990-05-15 Heureux Ghislain L Acoustic door
US5554830A (en) * 1990-07-19 1996-09-10 Matec Holding Ag Noise-reducing covering for vehicle interior
US5777279A (en) * 1995-12-05 1998-07-07 Parker; Murray M. Sound attenuating structure
US6123171A (en) * 1999-02-24 2000-09-26 Mcnett; Christopher P. Acoustic panels having plural damping layers
US6260660B1 (en) * 1998-12-18 2001-07-17 Sikorsky Aircraft Corporation Aircraft cabin interior noise treatment
US6371242B1 (en) * 1999-04-26 2002-04-16 Short Brothers Plc Noise attenuation panel
US20020170776A1 (en) * 2001-05-15 2002-11-21 Vincent Bouyonnet Sealing and acoustic insulation panel, in particular for automobile doors
US6668504B2 (en) * 2002-04-11 2003-12-30 Knight-Celotex, L.L.C. Sound-deadened wall and wall panel for same

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FR1242586A (en) * 1959-07-08 1960-09-30 Le Chassis Metallique Belge Ch Soundproof panel
GB1458637A (en) * 1973-10-18 1976-12-15 Anti Sound Ab Partition
BE823617A (en) * 1974-01-29 1975-04-16 MULTIPLE INSULATION GLAZING
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Publication number Priority date Publication date Assignee Title
US3160549A (en) * 1960-12-29 1964-12-08 Minnesota Mining & Mfg Vibration damping structures
US3611653A (en) * 1970-04-13 1971-10-12 Daniel L Zinn Sound attenuation wall partition
US3712846A (en) * 1971-06-23 1973-01-23 Carpenter L & Co Acoustical panel
US4317503A (en) * 1978-11-17 1982-03-02 Ingemanssons Ingenjorsbyra Ab Sound insulating building element
US4849276A (en) * 1984-02-17 1989-07-18 The Boeing Company Thermal insulation structure
US4630416A (en) * 1985-05-09 1986-12-23 Haworth, Inc. Acoustical panel
US4771860A (en) * 1986-08-06 1988-09-20 Siemens Aktiengesellschaft Edge sealing means in a sound-absorbing cover for use in a sound-emitting body
US4924969A (en) * 1988-11-09 1990-05-15 Heureux Ghislain L Acoustic door
US5554830A (en) * 1990-07-19 1996-09-10 Matec Holding Ag Noise-reducing covering for vehicle interior
US5777279A (en) * 1995-12-05 1998-07-07 Parker; Murray M. Sound attenuating structure
US6260660B1 (en) * 1998-12-18 2001-07-17 Sikorsky Aircraft Corporation Aircraft cabin interior noise treatment
US6123171A (en) * 1999-02-24 2000-09-26 Mcnett; Christopher P. Acoustic panels having plural damping layers
US6371242B1 (en) * 1999-04-26 2002-04-16 Short Brothers Plc Noise attenuation panel
US20020170776A1 (en) * 2001-05-15 2002-11-21 Vincent Bouyonnet Sealing and acoustic insulation panel, in particular for automobile doors
US6668504B2 (en) * 2002-04-11 2003-12-30 Knight-Celotex, L.L.C. Sound-deadened wall and wall panel for same

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040154418A1 (en) * 2003-01-24 2004-08-12 Hutchinson Mechanical structure presenting a modifiable vibratory property
US20080164093A1 (en) * 2005-03-17 2008-07-10 Swcc Showa Device Technology Co., Ltd. Sound Absorbing Material and Structure Using the Same
US20080196968A1 (en) * 2005-09-26 2008-08-21 Airbus Deutschland Gmbh Sound Absorbing Element and Method for Producing a Sound Absorbing Element
US7717228B2 (en) * 2005-09-26 2010-05-18 Airbus Deutschland Gmbh Sound absorbing element and method for producing a sound absorbing element
US20110108357A1 (en) * 2008-06-25 2011-05-12 Aircelle Acoustic panel for an ejector nozzle
US8640825B2 (en) * 2008-06-25 2014-02-04 Aircelle Acoustic panel for an ejector nozzle

Also Published As

Publication number Publication date
EP1443154A1 (en) 2004-08-04
BRPI0400050A (en) 2004-11-09
CA2455032A1 (en) 2004-07-24
FR2850410A1 (en) 2004-07-30
FR2850410B1 (en) 2006-02-03

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