US3814208A - Sound-absorbing panel for air-conditioning ducts and the like - Google Patents

Sound-absorbing panel for air-conditioning ducts and the like Download PDF

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Publication number
US3814208A
US3814208A US00216547A US21654772A US3814208A US 3814208 A US3814208 A US 3814208A US 00216547 A US00216547 A US 00216547A US 21654772 A US21654772 A US 21654772A US 3814208 A US3814208 A US 3814208A
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United States
Prior art keywords
projections
panel
ribs
apertures
rib segments
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Expired - Lifetime
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US00216547A
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English (en)
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E Villa
N Morresi
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/32—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material
    • E04C2/322—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material with parallel corrugations
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
    • E04B9/04—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/30—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure
    • E04C2/32—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material
    • E04C2/326—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by the shape or structure formed of corrugated or otherwise indented sheet-like material; composed of such layers with or without layers of flat sheet-like material with corrugations, incisions or reliefs in more than one direction of the element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
    • F24F13/068—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser formed as perforated walls, ceilings or floors
    • 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
    • E04B2001/8414—Sound-absorbing elements with non-planar face, e.g. curved, egg-crate 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
    • E04B2001/849—Groove or slot type openings
    • 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
    • E04B2001/8495—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element the openings going through from one face to the other face of the element
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
    • Y10T428/24281—Struck out portion type

Definitions

  • ABSTRACT A panel for the guidance of an air flow comprises a body of sheet material provided on opposite sides with mutually offset nozzles in the form of hollow bosses or perforated ribs converging outwardly.
  • the nozzles are formed by alternately bending the sheet material in opposite directions whereby a protuberance on one side corresponds to a depression on the other.
  • Our present invention relates to a perforated panel of sound-absorbing character adapted to be used as part of a wall of a duct or plenum chamber serving for the circulation of heating or cooling air in, for example, an air-conditioning system of the trickle type in which the air stream is cooled by the evaporation of dispersed water.
  • the air may pass, under the pressure of a circulating pump, between a solid upper wall and a lower wall forming a false ceiling for a room to be cooled.
  • the latter wall is advantageously composed of one or more perforated panels permitting some of the air under pressure to mix with the adjoining air volume.
  • the peforations may also have a noise-absorbing function by breaking up acoustic wavefronts so as to dissipate some of the energy of the sound waves.
  • the general object of our invention is to provide a panel designed to facilitate a substantially uniform exchange of air or other fluids over a large area separating two spaces such as a plenum chamber or duct for a circulating air stream and a room to be cooled or heated thereby.
  • a more particular object is to provide a panel of this description which is of .a highly sound-damping character so as to minimize the noise resulting from this fluid flow.
  • FIG. 1 is a plan view of a panel embodying the invention
  • FIG. 2 is a cross-sectional view taken on the line I l II of FIG. 1;
  • FIG. 3 is a fragmentary perspective view of another panel according to the invention.
  • FIG. 4 is a view similar to FIG. 3, showing a modification
  • FIG. 5 is a view similar to FIG. 1, illustrating a further embodiment.
  • FIG. 6 is a cross-sectional view taken on the line VI VI of FIG. 5.
  • FIGS. 1 and 2 we have shown a panel 1 of sheet material (e.g. foam plastic such as polystyrene) which is alternately bent in opposite directions to create upper and lower protuberances or projections 3, 5 in the form of funnel-shaped bosses provided with central apertures or ports 2 and 4, respectively.
  • the lower apertures4 lie at the centers of squares defined by the upper apertures 2, and vice versa.
  • the two sides Aand B of the panel are assumed to adjoin a high-pressure and a low-pressure region, respectively: these two sides are identically shaped except for a relative offset of the arrays of nozzles constituted by bosses 3 and 5.
  • the upper and lower nozzles are aligned along the diagonals of the squares and, in the cross-sectional view of FIG. 2 taken along one such diagonal, are shown to be interconnected by smoothly'curved transition zones in the form of generally S-shaped imperforate wall portions whose middle portions extend within a median plane.
  • the perforated projections or nozzles 3, 5 act as acoustic resonators having throats formed by the upper ports 2 and cavities constituted by adjoining air spaces.
  • the air or other fluid moving along one side of the panel is gently deflected away from the proximal apertures, traversing them at a relatively reduced rate, but can pass more readily through the distal apertures after expanding into the depressions leading thereto.
  • the impingement of the fluid stream upon the curved, generally S-shaped boundaries of the alternating convexities and concavities is absorbed with little or no noise generation.
  • the projections may be funnel-shaped or campaniform bosses or elongate ribs extending over all or partof the panel. In either case they may be uniformly distributed over one side in an array symmetrically in terleaved with the projections of a similar array on the opposite side.
  • the bosses on one side could be disposed at the corners of identical squares whose centers are occupied by bosses projecting from the opposite side. Such squares may also be defined by intersecting ribs on either side.
  • the lower bosses 5 intercept a major part of the wavefront of an acoustic wave which is therefore accelerated on its passage through the constricted necks 4 and attenuated by the frictional resistance of the fluid layers merging in that constriction. This results in a substantial increase in the noise-absorbing capacity of the panel material. Moreover, owing to the different flow rates through ports 2 and 4 as symbolized by the arrows in FIG. 2, the panel 1 behaves acoustient diameters.
  • FIG. 3 we have shown a modified panel 1' whose nozzles are formed by parallel ribs 3 and 5 projecting from the opposite sheet surfaces, the ribs being provided with respective rows of perforations 2' and 4'.
  • one set of projections e.g., the upper ribs 3' may confront a plenum chamber whereas the other set, 5', faces a room to be heated or cooled.
  • the aerodynamic and acoustic behavior of this panel is similar to that of the panel shown in FIGS. 1 and 2.
  • the body of the sheet is of generally S-shaped cross-section between alternating upper and lower projections.
  • FIG. 4 shows a generally similar panel 1" differing from panel 1' only by the fact that the apertures of its ribs 3" and 5" are in the form of longitudinally extending slots 2" and 4" in lieu of round holes 2' and 4'.
  • FIGS. 5 and 6 we have shown a further panel 1 whose projections 3" and 5" are in the shape of orthogonally intersecting rib segments provided with similarly intersecting slots 2" and 4", respectively. It will be noted that the pattern of the points of intersection of these slots is basically the same as that of the ports 2 and 4 of FIG. 1. Owing to the symmetry of its patterns, each of the panels 1, 1', etc. can be reversed without materially affecting the mode of operation.
  • the shape of the apertures could differ from those illustrated, as by being elliptical, ovoid or polygonal.
  • the widths of the apertures as well as their number depends, of course, upon the flow rate on the high-pressure side and the amount of fluid to be transferred to the low-pressure region.
  • the regular distribution of these apertures, at the requisite density, insures a uniform spread of the cross-flow over the entire perforated area.
  • constricted nozzle shape of the apertured projections lets the individual fluid jets issue at relatively low pressure with avoidance of turbulence which would tend to break up the fluid streams almost as soon as they leave the nozzles.
  • the disclosed structure lets the jets penetrate well into the adjoining region to mingle with its atmosphere.
  • the panels described and illustrated may be molded directly to shape or could be deformed, under heat and pressure, from flat sheets of thermoplastic material.
  • a panel for partly confining a fluid stream comprising a body of sheet material bent alternately in opposite directions with formation of two mutually interleaved but substantially identical sets of projections on opposite sides of said body and with apertures at the peaks of said projections, said projections converging outwardly toward said apertures, the projections on one side forming depressions on the other side which are substantially the negative counterparts of said projections adjacent projections on opposite sides of said body being inter-connected by smoothly curved transition zones of generally S-shaped cross-section with middle portions extending within a common median plane of said body, said projections being at least one set of parallel ribs on each side.
  • a panel for partly confining a fluid stream comprising a body of sheet material bent alternately in opposite directions with formation of two mutually interleaved but substantially identical sets of projections in the form of pairs of longitudinally slotted rib segments on opposite sides of said body, said rib segments converging outwardly toward their longitudinal slots, the rib segments on one side forming depressions on the other side which are substantially the negative counterparts of said rib segments, adjacent rib segments on 0pposite sides of said body being interconnected by smoothly curved transition zones of generally S-shaped cross-section with middle portions extending within a common median plane of said body.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Physics & Mathematics (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Acoustics & Sound (AREA)
  • Electromagnetism (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Duct Arrangements (AREA)
  • Building Environments (AREA)
  • Body Structure For Vehicles (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
US00216547A 1971-01-11 1972-01-10 Sound-absorbing panel for air-conditioning ducts and the like Expired - Lifetime US3814208A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1921571 1971-01-11

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US (1) US3814208A (enrdf_load_stackoverflow)
AR (1) AR192337A1 (enrdf_load_stackoverflow)
BE (1) BE777810A (enrdf_load_stackoverflow)
CH (1) CH529978A (enrdf_load_stackoverflow)
DE (1) DE2164164A1 (enrdf_load_stackoverflow)
ES (1) ES207580Y (enrdf_load_stackoverflow)
FR (1) FR2121763B3 (enrdf_load_stackoverflow)
GB (1) GB1375591A (enrdf_load_stackoverflow)
IL (1) IL38472A (enrdf_load_stackoverflow)
NL (1) NL7200344A (enrdf_load_stackoverflow)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3884009A (en) * 1973-10-26 1975-05-20 Grace W R & Co Method of ventilating a roof system
US3916054A (en) * 1973-02-23 1975-10-28 Int Harvester Co Compliant structural members
US3967693A (en) * 1973-05-24 1976-07-06 Asahi Kasei Kogyo Kabushiki Kaisha Apparatus for dismissing or decreasing sound's energy
US3997020A (en) * 1974-10-29 1976-12-14 Busnel Rene Guy Sound absorber
US4189886A (en) * 1974-07-01 1980-02-26 W. R. Grace & Co. Ventilated insulated roofing system
US4741941A (en) * 1985-11-04 1988-05-03 Kimberly-Clark Corporation Nonwoven web with projections
US5198626A (en) * 1987-10-02 1993-03-30 Helmut Pelzer Heat protective, sound permeable lining
US20050103568A1 (en) * 2002-03-19 2005-05-19 Bernard Sapoval Noise abatement wall
EP1655178A1 (fr) * 2004-11-05 2006-05-10 Peugeot Citroen Automobiles SA Pièce d'équipement de véhicule automobile ayant des caractéristiques d'absorption acoustique, son procédé de fabrication, et application à un pareboue
FR2877595A1 (fr) * 2004-11-05 2006-05-12 Peugeot Citroen Automobiles Sa Pare-boue perfectionne de vehicule automobile
FR2877594A1 (fr) * 2004-11-05 2006-05-12 Peugeot Citroen Automobiles Sa Piece d'equipement de vehicule automobile ayant des caracteristiques, d'absorption acoustique, et son procede de fabrication
US20080047779A1 (en) * 2004-06-30 2008-02-28 Bae-Young Kim Sound Absorption Block And Method Of Constructing The Same
US20130270035A1 (en) * 2010-12-21 2013-10-17 Yoshiharu Kitamura Soundproofing plate which does not obstruct airflow
US8714304B2 (en) * 2012-09-21 2014-05-06 Yoshiharu Kitamura Soundproofing plate and soundproofing device permitting air flow
US20140182227A1 (en) * 2012-12-31 2014-07-03 Morris Hassan Unitary safety surface tiles and associated structures
US20160185442A1 (en) * 2014-05-13 2016-06-30 The Boeing Company Method and apparatus for reducing structural vibration and noise
US20170081841A1 (en) * 2015-09-22 2017-03-23 Huu Dang Le Radiant Barrier Ventilation System
US10654424B2 (en) * 2017-10-24 2020-05-19 Hyundai Motor Company Composite panel for sound absorption and sound insulation
US11339545B2 (en) * 2018-10-31 2022-05-24 Hung-Ming Hsu Sound absorbing board

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4094379A (en) * 1976-09-13 1978-06-13 Body Guard Inc. Sound-absorption panel
FR2468076B1 (fr) * 1979-10-18 1987-05-22 Air Ind Gaine de diffusion d'air de ventilation
FR2611776A1 (fr) * 1987-02-24 1988-09-09 Brunel Christian Procede et panneau d'absorption acoustique
FR2683747B1 (fr) * 1991-11-20 1994-03-04 Azoulay Felix Cabine pour poudrage electrostatique de pieces quelconques.
DE4413119C2 (de) * 1994-04-20 1996-02-01 Hugo Weber Metalldachplatte zum Reinigen und Sauberhalten von Gebäudedächern
GB9516579D0 (en) * 1995-08-12 1995-10-11 Walker Timber Ltd Separating floor
EP0855478A3 (de) * 1997-01-22 1998-12-30 Graf von Montgelas, Max Joseph Verbundplatte aus Kunststoff und Verfahren zu ihrer Herstellung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2234517A (en) * 1938-04-15 1941-03-11 Robertson Co H H Laminated building sheet
FR1121259A (fr) * 1955-03-22 1956-07-31 Perfectionnement aux panneaux absorbants acoustiques
US3103255A (en) * 1960-12-23 1963-09-10 Applic Gomma Antivibranti S P Sound-absorbing wall covering
US3227598A (en) * 1960-12-02 1966-01-04 Wayne F Robb Core structure
US3479779A (en) * 1968-05-02 1969-11-25 Dow Chemical Co Composite construction panel
US3525663A (en) * 1967-03-09 1970-08-25 Jesse R Hale Anticlastic cellular core structure having biaxial rectilinear truss patterns
US3597891A (en) * 1969-10-02 1971-08-10 Mc Donnell Douglas Corp Interior absorptive panel
US3663346A (en) * 1970-07-22 1972-05-16 Nasa Honeycomb core structures of minimal surface tubule sections

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2234517A (en) * 1938-04-15 1941-03-11 Robertson Co H H Laminated building sheet
FR1121259A (fr) * 1955-03-22 1956-07-31 Perfectionnement aux panneaux absorbants acoustiques
US3227598A (en) * 1960-12-02 1966-01-04 Wayne F Robb Core structure
US3103255A (en) * 1960-12-23 1963-09-10 Applic Gomma Antivibranti S P Sound-absorbing wall covering
US3525663A (en) * 1967-03-09 1970-08-25 Jesse R Hale Anticlastic cellular core structure having biaxial rectilinear truss patterns
US3479779A (en) * 1968-05-02 1969-11-25 Dow Chemical Co Composite construction panel
US3597891A (en) * 1969-10-02 1971-08-10 Mc Donnell Douglas Corp Interior absorptive panel
US3663346A (en) * 1970-07-22 1972-05-16 Nasa Honeycomb core structures of minimal surface tubule sections

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916054A (en) * 1973-02-23 1975-10-28 Int Harvester Co Compliant structural members
US3967693A (en) * 1973-05-24 1976-07-06 Asahi Kasei Kogyo Kabushiki Kaisha Apparatus for dismissing or decreasing sound's energy
US3884009A (en) * 1973-10-26 1975-05-20 Grace W R & Co Method of ventilating a roof system
US4189886A (en) * 1974-07-01 1980-02-26 W. R. Grace & Co. Ventilated insulated roofing system
US3997020A (en) * 1974-10-29 1976-12-14 Busnel Rene Guy Sound absorber
US4741941A (en) * 1985-11-04 1988-05-03 Kimberly-Clark Corporation Nonwoven web with projections
US5198626A (en) * 1987-10-02 1993-03-30 Helmut Pelzer Heat protective, sound permeable lining
US7308965B2 (en) * 2002-03-19 2007-12-18 Ecole Polytechnique Noise abatement wall
US20050103568A1 (en) * 2002-03-19 2005-05-19 Bernard Sapoval Noise abatement wall
US20080047779A1 (en) * 2004-06-30 2008-02-28 Bae-Young Kim Sound Absorption Block And Method Of Constructing The Same
US7571790B2 (en) * 2004-06-30 2009-08-11 Bae-Young Kim Sound absorption block and method of constructing the same
FR2877595A1 (fr) * 2004-11-05 2006-05-12 Peugeot Citroen Automobiles Sa Pare-boue perfectionne de vehicule automobile
EP1655178A1 (fr) * 2004-11-05 2006-05-10 Peugeot Citroen Automobiles SA Pièce d'équipement de véhicule automobile ayant des caractéristiques d'absorption acoustique, son procédé de fabrication, et application à un pareboue
FR2877594A1 (fr) * 2004-11-05 2006-05-12 Peugeot Citroen Automobiles Sa Piece d'equipement de vehicule automobile ayant des caracteristiques, d'absorption acoustique, et son procede de fabrication
US8893851B2 (en) * 2010-12-21 2014-11-25 Yoshiharu Kitamura Soundproofing plate which does not obstruct airflow
US20130270035A1 (en) * 2010-12-21 2013-10-17 Yoshiharu Kitamura Soundproofing plate which does not obstruct airflow
US8714304B2 (en) * 2012-09-21 2014-05-06 Yoshiharu Kitamura Soundproofing plate and soundproofing device permitting air flow
US20140182227A1 (en) * 2012-12-31 2014-07-03 Morris Hassan Unitary safety surface tiles and associated structures
US9038342B2 (en) * 2012-12-31 2015-05-26 Playsafer Surfacing LLC a division Rubberecycle Unitary safety surface tiles and associated structures
US20160185442A1 (en) * 2014-05-13 2016-06-30 The Boeing Company Method and apparatus for reducing structural vibration and noise
US9725154B2 (en) * 2014-05-13 2017-08-08 The Boeing Company Method and apparatus for reducing structural vibration and noise
US20170081841A1 (en) * 2015-09-22 2017-03-23 Huu Dang Le Radiant Barrier Ventilation System
US10654424B2 (en) * 2017-10-24 2020-05-19 Hyundai Motor Company Composite panel for sound absorption and sound insulation
US11339545B2 (en) * 2018-10-31 2022-05-24 Hung-Ming Hsu Sound absorbing board

Also Published As

Publication number Publication date
IL38472A (en) 1975-03-13
BE777810A (fr) 1972-05-02
NL7200344A (enrdf_load_stackoverflow) 1972-07-13
IL38472A0 (en) 1972-02-29
CH529978A (it) 1972-10-31
ES207580Y (es) 1976-07-16
FR2121763A3 (enrdf_load_stackoverflow) 1972-08-25
GB1375591A (enrdf_load_stackoverflow) 1974-11-27
ES207580U (es) 1976-03-16
DE2164164A1 (de) 1972-08-03
FR2121763B3 (enrdf_load_stackoverflow) 1974-05-10
AR192337A1 (es) 1973-02-14

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