EP1842977A1 - Transparente, schallabsorbierende Platte - Google Patents

Transparente, schallabsorbierende Platte Download PDF

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Publication number
EP1842977A1
EP1842977A1 EP07006825A EP07006825A EP1842977A1 EP 1842977 A1 EP1842977 A1 EP 1842977A1 EP 07006825 A EP07006825 A EP 07006825A EP 07006825 A EP07006825 A EP 07006825A EP 1842977 A1 EP1842977 A1 EP 1842977A1
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EP
European Patent Office
Prior art keywords
panel according
sheet
micro
sheets
holes
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.)
Withdrawn
Application number
EP07006825A
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English (en)
French (fr)
Inventor
Vincenzo Tognaccini
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Individual
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Individual
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 Individual filed Critical Individual
Publication of EP1842977A1 publication Critical patent/EP1842977A1/de
Withdrawn legal-status Critical Current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
    • E01F8/0017—Plate-like elements
    • 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
    • E04B1/8409—Sound-absorbing elements sheet-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
    • 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
    • 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
    • E04B2001/8423—Tray or frame type panels or blocks, with or without acoustical filling
    • E04B2001/8452—Tray or frame type panels or blocks, with or without acoustical filling with peripheral frame members

Definitions

  • the present invention relates to a sound absorbent and acoustic insulation panel of the type comprising a framework, preferably of the cornice type, suitable to support a perforated front sheet associated in a parallel manner, with a rear non perforated sheet, and having a suitable air space sandwiched between the two sheets.
  • front sheet will refer to that sheet facing the direction of the sound source (noise source), in other words, that sheet which is in initial contact with the sound wave generated by the noise source.
  • acoustically insulated panels composed of a support frame for a sheet coated, or composed of, a sound absorbent material (such as a polystyrene foam or an open cell polyurethane for example)
  • sound absorbent panels have been produced, composed of a perforated front sheet separated at a certain distance from a non perforated sheet, by a hollow air cavity.
  • These panels are able to dissipate the acoustic energy of particular frequencies thanks to the friction which is developed during the oscillation of the air inside said hollow cavity between the perforated and non perforated sheets, during the passage of the sound wave between said panels, according to an operation pattern that can be considered similar to that of the Helmholtz resonator.
  • the dissipation of the acoustic energy of a certain frequency of the sound wave that strikes against the panel is at its maximum when the air oscillation reaches the frequency of system resonance. Since said resonance frequency is given by the geometry of the panel (including the hole diameter), for each panel geometry, and therefore for each hole diameter, the attenuation, through dissipation, only of a certain frequency of the sound wave to be attenuated.
  • patent EP-A-0 890 679 in the name of the Applicant DIESELBOX S.A. describes a sound absorbent panel of the aforesaid type, wherein the perforated sheet presents a plurality of holes of varying diameters, able to deaden different frequencies of the sound wave that hit the panel, by means of dissipation, according to the principle of the Helmholtz resonator.
  • the two parallel sheets that form the panel are composed of a transparent material, for use in installations out of doors, without creating barriers to light, which could be potentially harmful.
  • said panels resulted as being not particularly efficient, partly because they were able to absorb the frequencies for which they were configured only to a limited extent, because of the reduced number of holes of each diameter present on the sheet, and partially because, being based on the principle of the Helmholtz resonator which substantially provides for the absorption of the frequencies of the sound wave only for those oscillations able to induce a resonance frequency in the system composed of the small volume of air present between each hole and the non-perforated wall.
  • the vibrations induced in the casing which supports the sheets generally transmit noise, in other words, sound at frequencies which it is intended to deaden with this type of panel.
  • an aim of the present invention is to produce a panel of the aforesaid type, wherein the drawbacks present in prior technical art, do not occur, or are at least reduced.
  • one aim of the present invention is to produce a sound absorbent and acoustic insulation panel of the type comprising a frame that supports at least two transparent sheets, parallel with each other, of which, one is perforated and the other is solid, and which demonstrate considerable efficiency in reducing the noise at the required frequencies during the project design stage, which is simple to construct, does not require complicated maintenance, and at the same time, does not form an undesirable barrier to light transmission.
  • Another aim of the present invention is to produce sound-proof barriers for use along roadways, composed of one or more of the aforesaid panels, which are efficient in reducing noise and which at the same time have a low impact on the environment.
  • the sound absorbent panel comprises a support frame for a first front sheet, being at least partially transparent, perforated with a plurality of holes, and a second rear sheet, also partially transparent, not perforated, substantially parallel to the said first perforated sheet, and separated from it by a hollow air cavity (i.e. a air space).
  • a hollow air cavity i.e. a air space.
  • the panel of the present invention envisages that the holes of said first front sheet are micro-holes.
  • the term "at least partially transparent sheet” refers to the fact that the relative sheet is transparent for at least a certain set of light wavelengths and that therefore, the sheet may be coloured, but not opaque.
  • micro-holes refers to holes, similar to those generally cylindrical with a circular section, having a size (and in particular the diameter) comparable to the size of the acoustic boundary layer.
  • the noise absorption no longer occurs mainly due to energetic dissipation at the resonance frequency of the system (like the Helmholtz resonator.), but more because of damping caused by non adiabatic variations of the state of the air in proximity to the perforated walls, and by the force of the viscous friction between shear layers of the air flow.
  • the term "porosity" may be used to describe the perforations on the aforesaid micro-perforated sheet.
  • the coupling of at least one micro-perforated sheet with a solid sheet, set in a parallel position thereto, according to the present invention does not prevent an additional damping from occurring, caused by the resonance in the chamber defined between said sheets, according to the principle of the Helmholtz resonator.
  • the panel according to the present invention would seem to combine both the aforesaid principles for noise reduction, in other words, the damping of the acoustic energy above all caused by the viscous friction in the micro-holes and, although only partially, the energetic dissipation of the resonance frequency of the system (Helmholtz).
  • micro-holes generally having a diameter less than or equal to 2mm and preferably having a diameter less than 1mm in sheets with a thickness between 1.5mm and 7mm, implicates some physical behaviour by the panel of the present invention which differs from the behaviour based on the principle of the Helmholtz resonator of the non-micro-perforated sheets, common to technical state of the art; physical behaviour which, in the panel of the present invention, has resulted far more efficient in noise reduction than the behaviour of panels according to the prior art.
  • the sound absorbent panels comprise one or more further transparent micro-perforated sheets, sandwiched at fixed distances between and parallel with said first front micro-perforated sheet and with said second rear sheet.
  • Each of the perforated sheets of said panel can also advantageously present a plurality of micro-holes having the same constant diameter, and wherein said constant diameter of the micro-holes of each sheet is different from the diameter of the micro-holes of every other sheet.
  • the panel comprises parallel sheets, preferably made of polycarbonate, metacrylate, acrylic, or other synthetic material, with at least a partially curved surface, which have resulted as being not only efficient in noise reduction, but also adaptable for use with the particular geometries required in certain areas where the panels are to be installed.
  • the frame for the transparent sheets preferably specifically shaped in cornice form, is produced in, or comprises traditional sound absorbent material, such as polyurethane or glass fibre or mineral fibre etc., in order to limit potential noise diffusion through said frame.
  • said frame metal for example, inside which traditional sound absorbent material is inserted.
  • the frame for the transparent sheets comprises at least one element with a surface having a plurality of holes, or micro-holes, coupled at a set distance with another solid surface to provide sound absorbent capacity according to the principle of the Helmholtz resonator (if holes with a large diameter are used, for example, larger than 2mm), and/or the same principle (damping through viscous friction and attenuation of resonance frequency) of the transparent micro-perforated sheets coupled with the non perforated sheets described in the following claims.
  • the sound absorbent panel comprises a framework 1, preferably in the form of a cornice suitable to support at least one front sheet 2, with the entire surface perforated with micro-holes, that is, holes 12 having a diameter (d) comparable to the viscous boundary layer of the air in the same holes 12, and a rear, non perforated sheet 3, positioned parallel and at a certain distance from the aforesaid micro-perforated front sheet 2, thus forming a hollow cavity filled with air between said sheets 2, and 3.
  • the sheets 2 and 3 are advantageously not opaque in order to permit the passage of light through the panel.
  • the sheets 2 and 3 can be made from transparent or at least partially transparent materials (and therefore coloured) such as polycarbonate, metacrylate, acrylic, glass.
  • the diameter (d) of each micro-hole 6, in sheets 2 having a thickness (s) preferably ranging between 1,5mm and 7mm (and at most as far as 10mm), must substantially be equal to or less than 2mm and, preferably, be less than or equal to 1 mm.
  • the diameter of the micro-holes ranges between 0.5mm and 2mm, the distance between the sheets 2 and 3 can be equal to 3.5cm, or more, and the (radial) distance between adjacent micro-holes on the sheet 2 can be equal to 4.2mm.
  • the sound absorbent panel comprises at least two additional sheets 4 and 5, also micro-perforated, parallel to the sheets 2 and 3, and positioned at a distance between the latter to provide the space for the relative hollow air cavities between one sheet and the next.
  • the sheets 2 and 3 are also partially transparent to permit the light to pass through the panel, and can be produced in a material selected among polycarbonate, metacrylate, acrylic, glass.
  • the sheets 2, 3, 4, 5 which together with frame 1 form the sound absorbent panel described herein, are substantially plane/flat sheets.
  • each micro-perforated sheet 2, 4, 5 comprises a plurality of micro-holes 12, positioned in a regular manner over the whole surface and having a constant diameter (d) said constant diameter (d) can vary from sheet to sheet, to permit easy deadening of a wide band of sound frequencies by the panel according to the present invention.
  • said diameter (d) of the micro-holes can be reduced from one sheet to the next, beginning from the front most external micro-perforated sheet (2) as far as the most internal micro-perforated sheet (5).
  • the distance between the adjacent micro-holes of each micro-perforated sheet 2, 4, 5, can differ from sheet to sheet and in particular said distance can be increasing passing from the micro-perforated sheet 2 positioned furthest from the solid sheet 3 to the micro-perforated sheet 5 closest to the solid sheet 3.
  • the (radial) distance between adjacent micro-holes in the micro-perforated sheets 2, 4, 5 for example, can be equal to 4.2mm, 6.5mm and 10.9mm respectively, beginning from the most external sheet 2 (in other words- that sheet closest to the sound source) as far as the most internal sheet 5.
  • the sheets 2, 3, 4 and 5 of the panel described up to this point are held together by a frame 1, having a cornice configuration, composed of a plurality of structural elements suitable to support said sheets 2, 3, 4, 5, on the ground.
  • the Applicant was able to establish that when said structural elements 1, are produced in or associated with a traditional acoustic insulation (or sound absorbent) material, this makes a considerable contribution towards reducing the impact of sound waves and therefore in reducing the noise.
  • said structural elements of frame 1 can be built using tubular bodies, produced in steel, aluminium, plastic wood, plain or reinforced concrete, inside which at least one acoustically absorbent (or insulating) material 11 can be inserted.
  • This material can be glass or rock wool, polystyrene foam, open or closed cell polyurethane materials, fibre, polyester or bitumen materials, or other types of sound absorbent granular materials.
  • one or more of the structural elements of frame 1 can include a first front surface, in other words, placed on the front micro-perforated sheet 2, equipped with holes or micro-holes, according to the meaning herein attributed to this term, and a second solid rear surface, positioned at a certain distance from the aforesaid first perforated or micro-perforated surface, in order to provide a hollow air cavity between the two surfaces.
  • this specific conformation of frame 1, or of some of its structural elements employs the principle of the Helmholtz resonator, in the case of holes having a large diameter, over 2mm for example, or the principle of viscous dissipation of the acoustic energy through the use of micro-holes, to contribute towards reducing noise even further, basically preventing sound diffusion through the frame 1.
  • the structural elements of frame 1 can advantageously include non-permanent means of fixation for the sheets 2, 3, 4 and 5; such means, in the embodiment shown in figure 4, can include guide channels 7, 8, 9 and 10, inside which the respective sheets 2, 3, 4, 5 are inserted by sliding.
  • said channels 7, 8, 9, 10 can also be grooved into the two uprights of the frame 1, in a specular way, opposite one other.
  • the sheets 2, 3, 4, 5 can therefore be inserted between the uprights from at least one of the sides that forms the cross bar on frame 1.
  • the sheets 2, 3, 4, 5 can be easily replaced or removed for maintenance.
  • said sheets 2, 3, 4, 5 can be simply slid out from the frame 1 along the guide channels 7,8,9 and 10.
  • the sound absorbent panel object of the present invention can comprise means for washing said sheets 2, 3. 4, 5, preferably positioned inside the panel next to the sheets themselves, conceived not only to guarantee at least partial transparency of the sheets 2, 3, 4, 5, but also to ensure that the holes 12 do not become clogged with dust or dirt present in the air.
  • said washing means can include piping for a washing fluid which passes inside the cavities of the tubular elements of frame 1, as well as nozzles, included in the same tubular elements positioned inside the air cavities between the successive sheets, and configured to permit the washing liquid to circulate as far as the sheets inside the panel.
  • said panel can comprise a frame 101 with a substantially curved configuration, suitable to support the sheets 102, 103, 104 and 105, which also form a curved surface.
  • the sound absorbent panel can comprise a frame 201, with relative sheets, only partially curved.
  • figure 7 shows a sound absorbent panel according to another aspect of the present invention, in which a frame 301, preferably sound absorbent or coupled with traditional sound absorbent materials, is specifically shaped to support several front transparent micro-perforated panels 302a, 302b, 302c, overlaid on top of one another (or placed side by side).
  • a frame 301 preferably sound absorbent or coupled with traditional sound absorbent materials, is specifically shaped to support several front transparent micro-perforated panels 302a, 302b, 302c, overlaid on top of one another (or placed side by side).
  • the sound absorbent panels described above, and in particular the panels of the last embodiment shown in figure 7, result as being particularly efficient as sound-proof barriers for roadways, partly for their capacity to absorb noise, partly for their transparent aspect, as well as for their simple installation and maintenance, and their very high mechanical resistance.

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  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Electromagnetism (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
EP07006825A 2006-04-03 2007-04-02 Transparente, schallabsorbierende Platte Withdrawn EP1842977A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITPG20060027 ITPG20060027A1 (it) 2006-04-03 2006-04-03 Pannello fonoassorbente-fonoisolante-trasparente (p.f.f.t.)per realizzare barriere antirumore stradali o ferroviarie

Publications (1)

Publication Number Publication Date
EP1842977A1 true EP1842977A1 (de) 2007-10-10

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EP07006825A Withdrawn EP1842977A1 (de) 2006-04-03 2007-04-02 Transparente, schallabsorbierende Platte

Country Status (2)

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EP (1) EP1842977A1 (de)
IT (1) ITPG20060027A1 (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2314771A3 (de) * 2009-10-20 2014-03-26 Sapa Profili S.r.l. Säule für Schallschutzwand und zugehörige Schallschutzwand
EP2374940A3 (de) * 2010-04-06 2015-06-03 Akustik & Raum AG Absorbierende Lärmschutzwände
DE102015111168A1 (de) 2015-07-10 2017-01-12 Kuhn Gmbh Schallschutzbaueinheit
CN108894699A (zh) * 2018-08-09 2018-11-27 天津城建大学 一种透明微穿孔板复合构造的低频隔声窗
CN110230276A (zh) * 2019-07-17 2019-09-13 盈普声学（惠州）有限公司 一种透明通风消声装置
CN111276116A (zh) * 2020-03-24 2020-06-12 南京大学 一种多层微穿孔板吸声结构
US20200370293A1 (en) * 2014-03-20 2020-11-26 Corning Incorporated Transparent sound absorbing panels
US20210207368A1 (en) * 2017-02-27 2021-07-08 Knoll, Inc. Noise reduction apparatus and method of making and using the same
US11254087B2 (en) * 2017-04-26 2022-02-22 Corning Incorporated Micro-perforated glass laminates and methods of making the same
US11608291B2 (en) 2016-11-04 2023-03-21 Corning Incorporated Micro-perforated panel systems, applications, and methods of making micro-perforated panel systems
WO2024097258A1 (en) * 2022-10-31 2024-05-10 Temple University-Of The Commonwealth System Of Higher Education Metabarrier for sound mitigation
WO2024098541A1 (zh) * 2022-11-08 2024-05-16 阳光电源股份有限公司 一种消声风道装置及充电桩

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02274906A (ja) * 1989-04-14 1990-11-09 Furukawa Electric Co Ltd:The 防音壁用透明遮音パネル
DE9116233U1 (de) * 1991-04-10 1992-06-17 VEGLA Vereinigte Glaswerke GmbH, 5100 Aachen Schallabsorbierende Verglasung
DE4315759C1 (de) * 1993-05-11 1994-05-05 Fraunhofer Ges Forschung Schallabsorbierendes Glas- oder transparentes Kunstglasbauteil
DE19717266C1 (de) 1997-03-15 1998-04-09 Fraunhofer Ges Forschung Einrichtung für Schallabsorber mit mikroperforierten Bauteilen
EP0890679A2 (de) * 1997-07-09 1999-01-13 Dieselbox S.A. Transparente Lärmschutzwand aus Paneelen, versehen mit akustischer Isolierung und akustischen Absorbtionseigenschaften
JPH11323845A (ja) * 1998-05-15 1999-11-26 Kam:Kk 吸音パネル
EP1029984A1 (de) * 1999-02-19 2000-08-23 Röhm Gesellschaft mit beschränkter Haftung Lärmschutzwandsegment
DE20006946U1 (de) * 2000-04-14 2001-08-16 FAIST Automotive GmbH & Co. KG, 86381 Krumbach Breitbandig schallabsorbierender Bauteil für Wände, Böden und Decken

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02274906A (ja) * 1989-04-14 1990-11-09 Furukawa Electric Co Ltd:The 防音壁用透明遮音パネル
DE9116233U1 (de) * 1991-04-10 1992-06-17 VEGLA Vereinigte Glaswerke GmbH, 5100 Aachen Schallabsorbierende Verglasung
DE4315759C1 (de) * 1993-05-11 1994-05-05 Fraunhofer Ges Forschung Schallabsorbierendes Glas- oder transparentes Kunstglasbauteil
DE19717266C1 (de) 1997-03-15 1998-04-09 Fraunhofer Ges Forschung Einrichtung für Schallabsorber mit mikroperforierten Bauteilen
EP0890679A2 (de) * 1997-07-09 1999-01-13 Dieselbox S.A. Transparente Lärmschutzwand aus Paneelen, versehen mit akustischer Isolierung und akustischen Absorbtionseigenschaften
JPH11323845A (ja) * 1998-05-15 1999-11-26 Kam:Kk 吸音パネル
EP1029984A1 (de) * 1999-02-19 2000-08-23 Röhm Gesellschaft mit beschränkter Haftung Lärmschutzwandsegment
DE20006946U1 (de) * 2000-04-14 2001-08-16 FAIST Automotive GmbH & Co. KG, 86381 Krumbach Breitbandig schallabsorbierender Bauteil für Wände, Böden und Decken

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
FUCHS H V ET AL: "Eisatz mikro-perforierter Platten als Schallabsorber mit inhärenter Dämpfung", ACUSTICA, S. HIRZEL VERLAG, STUTTGART, DE, vol. 81, 1995, pages 107 - 116, XP002097650, ISSN: 0001-7884 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2314771A3 (de) * 2009-10-20 2014-03-26 Sapa Profili S.r.l. Säule für Schallschutzwand und zugehörige Schallschutzwand
EP2374940A3 (de) * 2010-04-06 2015-06-03 Akustik & Raum AG Absorbierende Lärmschutzwände
US20200370293A1 (en) * 2014-03-20 2020-11-26 Corning Incorporated Transparent sound absorbing panels
DE102015111168A1 (de) 2015-07-10 2017-01-12 Kuhn Gmbh Schallschutzbaueinheit
US11608291B2 (en) 2016-11-04 2023-03-21 Corning Incorporated Micro-perforated panel systems, applications, and methods of making micro-perforated panel systems
US20210207368A1 (en) * 2017-02-27 2021-07-08 Knoll, Inc. Noise reduction apparatus and method of making and using the same
US11746523B2 (en) * 2017-02-27 2023-09-05 Knoll, Inc. Noise reduction apparatus and method of making and using the same
US11254087B2 (en) * 2017-04-26 2022-02-22 Corning Incorporated Micro-perforated glass laminates and methods of making the same
CN108894699A (zh) * 2018-08-09 2018-11-27 天津城建大学 一种透明微穿孔板复合构造的低频隔声窗
CN110230276A (zh) * 2019-07-17 2019-09-13 盈普声学（惠州）有限公司 一种透明通风消声装置
CN111276116A (zh) * 2020-03-24 2020-06-12 南京大学 一种多层微穿孔板吸声结构
WO2024097258A1 (en) * 2022-10-31 2024-05-10 Temple University-Of The Commonwealth System Of Higher Education Metabarrier for sound mitigation
WO2024098541A1 (zh) * 2022-11-08 2024-05-16 阳光电源股份有限公司 一种消声风道装置及充电桩

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Publication number Publication date
ITPG20060027A1 (it) 2007-10-04

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