US20050167193A1 - Acoustic construction element - Google Patents

Acoustic construction element Download PDF

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Publication number
US20050167193A1
US20050167193A1 US10/507,123 US50712304A US2005167193A1 US 20050167193 A1 US20050167193 A1 US 20050167193A1 US 50712304 A US50712304 A US 50712304A US 2005167193 A1 US2005167193 A1 US 2005167193A1
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US
United States
Prior art keywords
cavities
construction element
acoustic construction
acoustic
sound insulating
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
US10/507,123
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English (en)
Inventor
Rudy Van Reeth
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.)
WEINERBERGER BRICKS NV
Original Assignee
WEINERBERGER BRICKS NV
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 WEINERBERGER BRICKS NV filed Critical WEINERBERGER BRICKS NV
Assigned to WEINERBERGER BRICKS N.V. reassignment WEINERBERGER BRICKS N.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: REETH, RUDY VAN
Publication of US20050167193A1 publication Critical patent/US20050167193A1/en
Abandoned legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
    • E01F8/00—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic
    • E01F8/0005—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement
    • E01F8/0047—Arrangements for absorbing or reflecting air-transmitted noise from road or railway traffic used in a wall type arrangement with open cavities, e.g. for covering sunken roads
    • E01F8/0076—Cellular, e.g. as wall facing
    • E01F8/0082—Cellular, e.g. as wall facing with damping material
    • 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
    • E04B1/8404—Sound-absorbing elements block-shaped
    • 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
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling
    • E04B2001/848—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element
    • E04B2001/8485—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element the opening being restricted, e.g. forming Helmoltz resonators
    • 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
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling
    • E04B2001/848—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element
    • E04B2001/849—Groove or slot type openings

Definitions

  • the present invention relates to an acoustic construction element comprising sound insulating cavities.
  • the acoustic bricks usually consist of ceramic material.
  • acoustic lining element made of burnt clay, ceramic materials, cement, wood, plaster or the like.
  • This acoustic lining element comprises a plane rectangular face intended to be attached to a wall.
  • the opposite face to this one comprises a network of ribs forming corrugations parallel to one of the sides.
  • Japanese patent application n o JP 09328833 describes a sound-absorbing block, obtained by baking fire clay, into which a pore imparting material is mixed, and fire-resisting chamotte.
  • the ceramic block there are bored holes of different depth, drilled all over at right angles to the thickness direction.
  • the ceramic block is reported to have sound absorbing performance in a frequency band having broad width.
  • German patent application DE 198 23 139 there is described an acoustic element comprising sound insulating cavities having a constant shape along an axis parallel to the exposed surface of the construction element, at least part of said cavities are first cavities comprising a first portion, situated closest to the external surface of the element, having a smaller width than the maximum width of a second, internal portion of the cavity. Furthermore, in one or more of the embodiments, for instance as shown in FIG. 26 of DB 198 23 139, at least part of said cavities are second cavities which have a substantially constant width over their entire depth, and art partially filled with damping strips out of gummy or a synthetic material.
  • all first cavities have the same depth, and also all second cavities have the same depth. Only in all of the second cavities, the same damping strip is provided. In this way, only a limited area of sound frequencies can be absorbed by such an acoustic construction element.
  • German patent application DE 33 22 199, French patent publication FR 2 746 831 and U.S. patent application Ser. No. 2,281,121 describe construction elements comprising cavities with different shapes and sizes.
  • DE 197 41 282 discloses acoustic construction elements showing several subsequent layers of zones of different structure and/or nature, whereas part of said zones consist of ceramic foam.
  • a load bearing acoustic building block which is formed of plastic material having all of the properties of the vitrified building block as to strength, appearance and density, and provided with sound absorbing properties, whereby the block may be used to construct the interior of walls and partitions of auditoriums by being laid in mortar or cement in the usual manner, and when so laid will absorb and diffuse audible sound waves striking said wall or partition to prevent reflection of the same to such an extent that undesirable echoes may be eliminated within the room of building formed of said blocks without the application of independent sound absorbing material.
  • the cavities are filled with a quantity of particles of material, such as sawdust or expanded mica flakes, to form sound absorbing filter.
  • the purpose of this invention is to combine, in a very specific way, some of the proposed features with other added features so as to provide an acoustic construction element having optimal properties.
  • the invention thus provides a sound insulating construction element that can absorb a broad range of sound frequencies and that can be manufactured depending on the type or the frequency of noise pressure.
  • the frequency of the disturbing noise that results from a truck that drives on a highway differs from the noise that has to be absorbed when one records a song in a music studio.
  • an acoustic construction element comprising sound insulating cavities having a constant shape along an axis parallel to the exposed surface of the construction element, at least part of said cavities being first cavities comprising a first portion, situated closest to the external surface of the element, having a smaller width than the maximum width of a second, internal portion of the cavity, and at least part of said cavities ( 3 ) being second cavities having a substantially constant width over their entire depth, wherein
  • At least part of the first cavities have an angular shape.
  • the intention of this is to provide a volume as large as possible after the entry.
  • At least part of the first cavities have a pseudo-rectangular shape. So, there is more reflection of the sound inside the cavity.
  • Pseudo-rectangular means that the cavities have at least one acute angle.
  • At least 90% of said first and/or second cavities are completely filled with sound insulating material.
  • At least 90% of said first and/or second cavities are partially filled with sound insulating material.
  • said first and/or second cavities are completely or partially filled with foamed mineral product.
  • said first and/or second cavities are completely or partially filled with foamed clay, glass and pearlite.
  • the elements are manufactured in one step process.
  • Such method is used where the sound isolating material has a bake curve corresponding to the material from which the acoustic construction elements are made.
  • a second method for manufacturing acoustic construction elements is to manufacture the elements in a two process step.
  • the sound isolating material for example: polystyrene foam (such as isomo), glass wool, . . . is introduced in the cavities in a second process step.
  • This method is of course also applicable for material which has a bake curve corresponding to the material from which the acoustic construction elements are made.
  • said construction element is made of ceramic material.
  • ceramic construction elements can be used as regular building bricks.
  • the construction element according to the invention can also be used as a traffic load carrying construction element.
  • the method for manufacturing acoustic construction elements is preferably by way of extrusion or the ceramic materials.
  • FIG. 1 is a cross section of an acoustic construction element
  • FIG. 2 is a cross section of an acoustic construction element of which the cavities have an angular shape
  • FIG. 3 is a cross section of an acoustic construction element of which the cavities have an angular or pseudo-rectangular shape.
  • the acoustic construction element is an acoustic brick ( 1 ) with a length of 324 cm., a height of 5 cm. and a width of 10 cm.
  • the brick is manufactured by extrusion of ceramic material, more specific red-baking clay.
  • the acoustic brick has a smooth surface. By using other clays or by addition of aggregates to the base material, the brick can obtain a different colour or even a sandy structure. The surface can also be rough. In function of the composition, characteristics as the absorption of water, the intensity of the pressure, eta can differ.
  • the acoustic brick ( 1 ) comprises at irregular distances, separate entries ( 2 ) of is cavities ( 3 ), the cavities in general are designated by reference numerals 3 , etc., which:
  • the brick has thus a two-fold function: for one, the ceramic mass takes care for the absorption of the sound—the ceramic mass is the combination of the brick and the sound absorbing material—, And for another, the cavities, partially or completely filled with sound insulating material, are dimensioned in such a way that through the way of internal reflection, the sound doesn't get the chance to be reflected into free space.
  • the depth, the shape and the internal volume of the cavities ( 3 ) and their position on the stone can be adapted in function of certain types of frequencies and/or the level of the sound that has to be adsorbed.
  • An other object of the invention is the method of manufacturing an acoustic construction element comprising sound insulating cavities.
  • a first method is to manufacture a brick in one process step.
  • the brick is extruded of ceramic material and is provided with a cavity ( 3 ).
  • the sound insulting material is introduced through the entry ( 2 ) of the cavity ( 3 ).
  • This combination (brick+sound insulating material) is brought into a heating device where during one process step baking as well as expansion of the sound insulating material happened.
  • Another method for manufacturing a construction element according to the invention is to fabricate a brick in a two process step.
  • the sound insulating materials for example glass wool, foamed plastic (such as isomo), . . . are introduced in a second process step, after the drying and baking of the brick.
  • the acoustic construction element according to the invention can be used in every place where noise or noise pollution is an item, for instance in:
  • the cavities can also serve as a carrier of technical pipes for, for instance, electricity, computers, telephone, sanitary, heating, . . .
  • the bricks or the panels can be mounted either horizontally, either vertically, or in a combination of the two, can be glued together or laid in bricks, or can function as a carrying or non-carrying part.
  • the bricks can be used as road blocks on which traffic can circulate.
  • the disturbing frequencies that arise when car types roll over the road surface can be absorbed by using the acoustic bricks as horizontal carrying driving surfaces.
  • the cavities that are present in the bricks could also function for draining the excess of water when it's raining.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Acoustics & Sound (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Electromagnetism (AREA)
  • Building Environments (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
US10/507,123 2002-03-14 2002-03-14 Acoustic construction element Abandoned US20050167193A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2002/003045 WO2003076736A1 (fr) 2002-03-14 2002-03-14 Element de construction acoustique

Publications (1)

Publication Number Publication Date
US20050167193A1 true US20050167193A1 (en) 2005-08-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US10/507,123 Abandoned US20050167193A1 (en) 2002-03-14 2002-03-14 Acoustic construction element

Country Status (5)

Country Link
US (1) US20050167193A1 (fr)
EP (1) EP1483457A1 (fr)
AU (1) AU2002257683A1 (fr)
CA (1) CA2479258A1 (fr)
WO (1) WO2003076736A1 (fr)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060231331A1 (en) * 2005-04-14 2006-10-19 Rpg Diffusor Systems, Inc. Extended bandwidth folded well diffusor
US20070034448A1 (en) * 2005-08-11 2007-02-15 D Antonio Peter Hybrid amplitude-phase grating diffusers
US20080135327A1 (en) * 2005-03-30 2008-06-12 Toshiyuki Matsumura Sound Absorbing Structure
US20110169375A1 (en) * 2010-01-13 2011-07-14 The Aerospace Corporation Photostructured Acoustic Devices and Methods for Making Same
US20110278091A1 (en) * 2010-05-17 2011-11-17 Yamaha Corporation Acoustic Structure
US20120247867A1 (en) * 2010-01-08 2012-10-04 Jun Yang Composite sound-absorbing device with built in resonant cavity
US20140034413A1 (en) * 2012-07-31 2014-02-06 Yamaha Corporation Acoustic Structure
US20140339015A1 (en) * 2013-05-16 2014-11-20 Alaa Salman Abdullah Algargoosh Sound diffuser inspired by cymatics phenomenon
US20150083520A1 (en) * 2013-09-24 2015-03-26 Preston Wilson Underwater Noise Abatement Panel and Resonator Structure
US20150090526A1 (en) * 2012-06-04 2015-04-02 3M Innovative Properties Company Sound absorbing (acoustic) board
US20150225942A1 (en) * 2011-05-16 2015-08-13 Fabio Pozzana Method of perforating a foam structure and an acoustic foam structure
US9290274B2 (en) * 2014-06-02 2016-03-22 Mra Systems, Inc. Acoustically attenuating sandwich panel constructions
US9410403B2 (en) 2013-12-17 2016-08-09 Adbm Corp. Underwater noise reduction system using open-ended resonator assembly and deployment apparatus
US20160372101A1 (en) * 2015-06-18 2016-12-22 Board Of Regents, The University Of Texas System Injection Molded Noise Abatement Assembly and Deployment System
US20170132999A1 (en) * 2014-06-18 2017-05-11 Carbon Air Limited Sound attenuation
US20190120143A1 (en) * 2017-10-19 2019-04-25 General Electric Company Modular acoustic blocks and acoustic liners constructed therefrom
US20210074255A1 (en) * 2019-09-11 2021-03-11 The Hong Kong University Of Science And Technology Broadband sound absorber based on inhomogeneous-distributed helmholtz resonators with extended necks
US10971129B2 (en) * 2015-08-20 2021-04-06 Fujifilm Corporation Soundproof structure, louver, and soundproof wall
US20230295925A1 (en) * 2018-03-29 2023-09-21 Tectonic Facades Ltd Facing building member
US11812221B2 (en) 2020-01-21 2023-11-07 Adbm Corp. System and method for simultaneously attenuating high-frequency sounds and amplifying low-frequency sounds produced by underwater acoustic pressure source
US12586556B2 (en) * 2023-09-20 2026-03-24 Toyota Motor Engineering & Manufacturing North America, Inc. Angle independent acoustic structures for broadband sound absorption and sound transmission loss

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITRE20080088A1 (it) * 2008-09-29 2010-03-30 Ceramiche Sadon S P A '' lastra ceramica per rivestimento, impianto e metodo di produzione "
ITPI20090156A1 (it) * 2009-12-11 2011-06-12 Urbantech S R L Pannelli in porenbeton con fori per aumentare la capacità di fonoassorbenza per un loro utilizzo come barriere antirumore.
ES2397596B1 (es) * 2011-02-07 2014-01-16 Asociación Española De Fabricantes De Azulejos Y Pavimentos Cerámicos (Ascer) Pieza cerámica para acondicionamiento acústico.

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US2281121A (en) * 1939-08-25 1942-04-28 Merton T Straight Load bearing acoustic building block
US3837426A (en) * 1974-01-04 1974-09-24 Junger M Sound absorbing structural block
US4160491A (en) * 1978-07-25 1979-07-10 Bridgestone Tire Co., Ltd. Perlite sound absorbing plate and sound insulating wall composed of the same
US4964486A (en) * 1989-11-06 1990-10-23 Rpg Diffusor Systems, Inc. Cinder block modular diffusor
US6772859B2 (en) * 2002-09-26 2004-08-10 Rpg Diffusor Systems, Inc. Embodiments of aperiodic tiling of a single asymmetric diffusive base shape

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FR2746831B1 (fr) 1996-03-29 1998-07-10 Joseph Perasso Et Ses Fils Element modulaire de construction ou de renovation pour la protection phonique
JPH09328833A (ja) 1996-06-07 1997-12-22 Isolite Kogyo Kk セラミックス吸音材
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WO2002022961A1 (fr) * 2000-09-13 2002-03-21 Wienerberger Bricks N.V. Element de construction acoustique pour isolation acoustique dans une large gamme de frequences

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2281121A (en) * 1939-08-25 1942-04-28 Merton T Straight Load bearing acoustic building block
US3837426A (en) * 1974-01-04 1974-09-24 Junger M Sound absorbing structural block
US4160491A (en) * 1978-07-25 1979-07-10 Bridgestone Tire Co., Ltd. Perlite sound absorbing plate and sound insulating wall composed of the same
US4964486A (en) * 1989-11-06 1990-10-23 Rpg Diffusor Systems, Inc. Cinder block modular diffusor
US6772859B2 (en) * 2002-09-26 2004-08-10 Rpg Diffusor Systems, Inc. Embodiments of aperiodic tiling of a single asymmetric diffusive base shape

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080135327A1 (en) * 2005-03-30 2008-06-12 Toshiyuki Matsumura Sound Absorbing Structure
US7743880B2 (en) * 2005-03-30 2010-06-29 Panasonic Corporation Sound absorbing structure
US20060231331A1 (en) * 2005-04-14 2006-10-19 Rpg Diffusor Systems, Inc. Extended bandwidth folded well diffusor
US7322441B2 (en) * 2005-04-14 2008-01-29 Rpg Diffusor Systems, Inc. Extended bandwidth folded well diffusor
US20070034448A1 (en) * 2005-08-11 2007-02-15 D Antonio Peter Hybrid amplitude-phase grating diffusers
US7428948B2 (en) * 2005-08-11 2008-09-30 Rpg Diffusor Systems, Inc. Hybrid amplitude-phase grating diffusers
US20120247867A1 (en) * 2010-01-08 2012-10-04 Jun Yang Composite sound-absorbing device with built in resonant cavity
US20110169375A1 (en) * 2010-01-13 2011-07-14 The Aerospace Corporation Photostructured Acoustic Devices and Methods for Making Same
US8410660B2 (en) * 2010-01-13 2013-04-02 The Aerospace Corporation Acoustic devices embedded in photostructurable ceramics
US20110278091A1 (en) * 2010-05-17 2011-11-17 Yamaha Corporation Acoustic Structure
US8631901B2 (en) * 2010-05-17 2014-01-21 Yamaha Corporation Acoustic structure
US20150225942A1 (en) * 2011-05-16 2015-08-13 Fabio Pozzana Method of perforating a foam structure and an acoustic foam structure
US9499976B2 (en) * 2011-05-16 2016-11-22 Sealed Air Corporation (Us) Method of perforating a foam structure and an acoustic foam structure
US20150090526A1 (en) * 2012-06-04 2015-04-02 3M Innovative Properties Company Sound absorbing (acoustic) board
US20140034413A1 (en) * 2012-07-31 2014-02-06 Yamaha Corporation Acoustic Structure
US9214148B2 (en) * 2012-07-31 2015-12-15 Yamaha Corporation Acoustic structure
US9058799B2 (en) * 2013-05-16 2015-06-16 University Of Dammam Sound diffuser inspired by cymatics phenomenon
US20140339015A1 (en) * 2013-05-16 2014-11-20 Alaa Salman Abdullah Algargoosh Sound diffuser inspired by cymatics phenomenon
US20150083520A1 (en) * 2013-09-24 2015-03-26 Preston Wilson Underwater Noise Abatement Panel and Resonator Structure
US9343059B2 (en) * 2013-09-24 2016-05-17 Board Of Regents, The University Of Texas System Underwater noise abatement panel and resonator structure
US9607601B2 (en) * 2013-09-24 2017-03-28 Board of Regents, The Univesity Systems Underwater noise abatement panel and resonator structure
US9410403B2 (en) 2013-12-17 2016-08-09 Adbm Corp. Underwater noise reduction system using open-ended resonator assembly and deployment apparatus
US9290274B2 (en) * 2014-06-02 2016-03-22 Mra Systems, Inc. Acoustically attenuating sandwich panel constructions
US20170132999A1 (en) * 2014-06-18 2017-05-11 Carbon Air Limited Sound attenuation
US20160372101A1 (en) * 2015-06-18 2016-12-22 Board Of Regents, The University Of Texas System Injection Molded Noise Abatement Assembly and Deployment System
US9812112B2 (en) * 2015-06-18 2017-11-07 Board Of Regents, The University Of Texas System Injection molded noise abatement assembly and deployment system
US10971129B2 (en) * 2015-08-20 2021-04-06 Fujifilm Corporation Soundproof structure, louver, and soundproof wall
US20190120143A1 (en) * 2017-10-19 2019-04-25 General Electric Company Modular acoustic blocks and acoustic liners constructed therefrom
US10815894B2 (en) * 2017-10-19 2020-10-27 General Electric Company Modular acoustic blocks and acoustic liners constructed therefrom
US20230295925A1 (en) * 2018-03-29 2023-09-21 Tectonic Facades Ltd Facing building member
US20210074255A1 (en) * 2019-09-11 2021-03-11 The Hong Kong University Of Science And Technology Broadband sound absorber based on inhomogeneous-distributed helmholtz resonators with extended necks
US11929053B2 (en) * 2019-09-11 2024-03-12 The Hong Kong University Of Science And Technology Broadband sound absorber based on inhomogeneous-distributed Helmholtz resonators with extended necks
US11812221B2 (en) 2020-01-21 2023-11-07 Adbm Corp. System and method for simultaneously attenuating high-frequency sounds and amplifying low-frequency sounds produced by underwater acoustic pressure source
US12586556B2 (en) * 2023-09-20 2026-03-24 Toyota Motor Engineering & Manufacturing North America, Inc. Angle independent acoustic structures for broadband sound absorption and sound transmission loss

Also Published As

Publication number Publication date
CA2479258A1 (fr) 2003-09-18
WO2003076736A1 (fr) 2003-09-18
EP1483457A1 (fr) 2004-12-08
AU2002257683A1 (en) 2003-09-22

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