WO2008141380A1 - Matériau en feuille destiné à être utilisé dans un écran acoustique multicouche - Google Patents

Matériau en feuille destiné à être utilisé dans un écran acoustique multicouche Download PDF

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Publication number
WO2008141380A1
WO2008141380A1 PCT/AU2008/000707 AU2008000707W WO2008141380A1 WO 2008141380 A1 WO2008141380 A1 WO 2008141380A1 AU 2008000707 W AU2008000707 W AU 2008000707W WO 2008141380 A1 WO2008141380 A1 WO 2008141380A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet material
shield
layer
acoustic shield
sound
Prior art date
Application number
PCT/AU2008/000707
Other languages
English (en)
Inventor
Mark Borroni
Original Assignee
Bellmax Acoustic Pty Ltd
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
Priority claimed from AU2007902701A external-priority patent/AU2007902701A0/en
Application filed by Bellmax Acoustic Pty Ltd filed Critical Bellmax Acoustic Pty Ltd
Publication of WO2008141380A1 publication Critical patent/WO2008141380A1/fr

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/162—Selection of materials
    • G10K11/168—Plural layers of different materials, e.g. sandwiches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • B60R13/0815—Acoustic or thermal insulation of passenger compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • B60R13/0838—Insulating elements, e.g. for sound insulation for engine compartments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
    • B60R13/08—Insulating elements, e.g. for sound insulation
    • B60R13/0884—Insulating elements, e.g. for sound insulation for mounting around noise sources, e.g. air blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4209—Insulation arrangements, e.g. for sound damping or heat insulation
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4246—Details of the tub
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/20—Exhaust treating devices having provisions not otherwise provided for for heat or sound protection, e.g. using a shield or specially shaped outer surface of exhaust device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation

Definitions

  • the present invention relates to a sheet material. More particularly, the present invention relates to a sheet material for use as a layer in a multilayered acoustic shield.
  • the sheet material is well suited for use in an acoustic shield that can be mounted to a panel, for example a transmission tunnel of a motor vehicle, it will be convenient to describe the invention in relation to that example application. It should however be understood that the invention is equally suitable for use as a layer in a multilayered acoustic shield for other applications besides vehicles.
  • Acoustic shields are used to reduce the impact of undesirable sound, otherwise known as noise, on surrounding areas.
  • Acoustic shields typically consist of one or more layers which interact with sound waves incident on the shield.
  • acoustic shields are mounted on a surface to reduce the transmission of sound through the surface.
  • virtually all modern day motor vehicles have some form of acoustic shield lining the compartment areas of the motor vehicle, for example the luggage compartment, otherwise known as the vehicle's boot, and the passenger compartment, where the vehicle operator and/or passengers are located during transit. Whilst, the acoustic shielding is usually positioned internally of the compartment areas, it is however technically better to place the shielding externally, for example on the fire wall in the engine bay and/or underneath the vehicle's floorpan.
  • a problem with this type of arrangement is that sound waves are not able to readily penetrate the outer layer and subsequently interact with the underlying layers. Instead, a significant proportion of sound waves incident on the outer layer are reflected away from the acoustic shield into the surrounding environment. This is particularly problematic as regulatory bodies are increasingly demanding a reduction in the emission of sound, for example by motor vehicles, into the surrounding environment. Attempts have been made to improve the acoustic performance of acoustic shields having a protective outer layer by providing a plurality of perforations in selected areas of the outer layer to increase the ability of sound waves to penetrate the layer and subsequently interact with the underlying layers. However, a problem with this approach is that the number and size of perforations needed to improve the performance of the shield undermines the outer layer's ability to protect the underlying layers from the harsh surrounding environment.
  • a sheet material for use as a layer in a multilayered acoustic shield.
  • the sheet includes a plurality of indentations wherein at least one of the indentations includes an aperture and sidewalls which converge towards the aperture.
  • the aperture is arranged to abut with an adjoining layer of the acoustic shield to thereby guide sound waves incident on the sidewalls through the aperture towards the adjoining layer.
  • the aperture is circular and the sidewalls provide a continuous curved surface extending around the aperture.
  • a multiple number of the indentations each include an aperture and sidewalls which converge towards their respective aperture.
  • the sheet material is a support layer of a multilayered acoustic shield.
  • the shield includes an outer portion and an inner portion.
  • the outer portion includes the support layer and the inner portion includes a sound-absorbing layer.
  • the outer portion may further include a metallic foil located between the support layer and the inner portion.
  • the metallic foil can be located between the support layer and the sound- absorbing layer.
  • the sound-absorbing layer is preferably made of a fibrous material.
  • the inner portion may further include a backing layer made of a polymer film, paper or a thin layer of aluminium.
  • the backing layer can be located next to the sound-absorbing layer such that the sound absorbing-layer is positioned between the backing layer and the outer portion.
  • the multilayered acoustic shield is fastenable to a panel such that the inner portion engages with the panel, to thereby reduce the transmission of sound waves through the panel.
  • the backing layer presses against the panel such that the sound-absorbing layer is preferably compressed between the backing layer and the metallic foil with the shield conforming with a curvature of the panel.
  • the present invention advantageously provides a sheet material which when used as an outer layer of a multilayered acoustic shield, is able to protect underlying layers from excessive heat, debris, water and the like whilst at the same time enhance the ability of sound waves to penetrate the layer and subsequently interact with the underlying layers.
  • the Helmholtz resonator created by each cavity formed between the sidewalls of adjoining indentations and the adjoining layer of the acoustic shield advantageously reduces mechanical and/or vibrational energy of the sound wave interacting with each cavity by converting the energy into thermal energy.
  • the present invention also minimises the reflection of sound waves into the surrounding environment.
  • Figure 1 is a perspective view of a first side of a sheet material, according to a first embodiment of the invention
  • Figure 2 is a perspective view of a second side of the sheet material shown in Figure 1 ;
  • Figure 3 is a cross-sectional view of the sheet material illustrated in Figure
  • Figure 4 is a perspective view of a first side of a sheet of material according to a second embodiment of the invention.
  • Figure 5 is a perspective view of a second side of the sheet of material shown in Figure 4.
  • Figure 6 is a cross-sectional view of the sheet material illustrated in Figure 4 taken along line A-A in Figure 4;
  • Figure 7 is a perspective view of a first side of a sheet of material according to a third embodiment of the invention.
  • Figure 8 is a cross-sectional view of the sheet material illustrated in Figure
  • Figure 9 is a cross sectional view of a transmission tunnel in a vehicle with a multilayered acoustic shield attached thereto, the multilayered acoustic shield having a layer of sheet material in accordance with an embodiment of the invention
  • Figure 10 is a cross sectional view of a multilayered acoustic shield illustrating the various components of the shield according to an embodiment of the invention
  • Figure 10a is a cross sectional view of a multilayered acoustic shield illustrating the various components of the shield according to another embodiment of the invention.
  • Figure 11 is a graph of the absorption coefficient of various sample layers at a range of frequencies.
  • the sheet material 1 for use as the main structural layer of a multilayered acoustic shield.
  • the sheet material 1 includes a plurality of indentations 3 with a multiple number of the indentations 3 each having an aperture 5 and sidewalls 7 which converge towards their respective aperture 5.
  • the size of the apertures 5 and the depth of the indentations 3 have been magnified in the drawings, particularly in Figures 1 to 6, 10 and 10a, for clarity.
  • the apertures 5 are preferably circular and have a diameter of between approximately 2.5 mm and 10 mm.
  • the apertures 5 can however be of any other desired shape, for example square, triangular, etc.
  • the sheet material 1 is preferably rigid and made of a metal, for example aluminium, with the thickness of the metal being between approximately 0.4 mm and 2 mm.
  • the indentations 3 provide the sheet material 1 with improved strength and rigidity.
  • the overall thickness of the sheet materials 1 shown in Figures 1 to 8 ranges between approximately 3mm and 5 mm, depending upon the depth of the indentations 3 and the thickness of the metal.
  • the sidewalls 7 of adjoining indentations 3 converge towards one another and are separated from each other by a surrounding region 6.
  • the surrounding region 6 can be reduced in size by positioning the apertures 5 closer to one another.
  • the surrounding region 6 can be planar, as shown in Figures 1 , 2 and 7, or alternatively be curved.
  • the apertures 5 preferably provide the sheet material 1 with an open area of approximately 25%.
  • the sidewalls 7 of adjoining indentations 3 converge towards one another with a perforation 8 being provided at the intersection of the sidewalls 7 of adjoining indentations 3.
  • a cavity 9 is formed between the sidewalls 7 of adjoining indentations 3 and the adjoining surface.
  • the perforations 8 provide an opening to each cavity 9 to define each cavity as a Helmholtz resonator.
  • the perforations 8 may range between approximately 0.1mm and 1.0mm in diameter and can be formed by piercing the sheet material 1 which can also provide each perforation 8 with a neck-like region.
  • the apertures 5 are circular and the sidewalls 7 of the indentations 3 form a continuous curved surface around each aperture 5.
  • the sidewalls 7 also curve or flare outwardly from the apertures 5 by a considerable amount, in comparison with the sidewalls 7 in the sheet material 1 shown in Figures 4 and 5.
  • the angle of the sidewalls 7 with respect to the aperture 5 and the degree of curvature away from the apertures 5 can be varied to suit each application.
  • the sidewalls 7 converge towards the aperture 5 and are generally parabolic with the overall shape of each indentation 3 generally resembling that of funnel, frustum or truncated cone.
  • the sidewalls 7 also converge towards the aperture 5 and are generally parabolic. However, in Figure 8 free ends 10 of the sidewalls 7 are substantially parallel to one another.
  • the sidewalls 7 of the indentations 3 can be of any shape which is suitable for guiding sound waves incident on the sidewalls 7 towards and into the apertures 5.
  • the sidewalls 7 could be planar with the overall shape of each indentation 3 resembling a truncated pyramid. It is also possible that a combination of differently shaped indentations 3 could be provided over the sheet material 1.
  • the sheet material 1 may generally be regarded as having the appearance of a sinusoidal wave with the apertures 5 being provided at the troughs and the sidewalls 7 terminating at the peaks.
  • the indentations 3 in the sheet material 1 shown in the accompanying drawings are arranged in columns and row.
  • the indentations 3 may alternatively be non-uniformly distributed over the sheet material 1. Further, the indentations 3 may be grouped together and only provided over a specific section of the sheet material 1.
  • the sidewalls 7 and apertures 5 in the indentations 3 are able to be formed in a single embossing process. With this process the apertures 5 can be created exactly at the trough of the indentations 3 rather than being randomly positioned as occurs when the apertures are created as a separate process.
  • a multilayered acoustic shield 13 which has an outer portion and an inner portion.
  • the multilayered acoustic shield 13 is shown mounted to the underside of a transmission tunnel 19 in a motor vehicle floorpan.
  • the multilayered acoustic shield 13 is illustrated prior to being suitably shaped and mounted to the transmission tunnel 19.
  • the outer portion of the shield 13 includes a support layer 15 which consists of the sheet material 1.
  • the support layer 15 is the main structural layer of the acoustic shield 13.
  • the inner portion includes a sound-absorbing layer 17.
  • the outer portion of the multilayered acoustic shield 13 further includes a metallic foil 21 which is located between the support layer 15 and the sound-absorbing layer 17.
  • the apertures 5 are shown in abutment with the metallic foil 21. It is however possible to position the apertures 5 in close proximity to the metallic foil 21 rather than abutment. In either case sound waves incident on the sidewalls 7 of the indentations 3 in the support layer 15 are able to be guided through the apertures 5 by reflection off the sidewalls 7 such that sound waves are thereby directed to the metallic foil 21.
  • the metallic foil 21 is preferably made of aluminium and can range between approximately 0.01 mm and 0.04 mm in thickness. In conjunction with the support layer 15, the metallic foil 21 adds an additional layer of protection to underlying layers of the multilayered acoustic shield 13.
  • the metallic foil 21 may have a series of micro-perforations to enable sound to more readily penetrate the foil 21 and subsequently interact with the sound-absorbing layer 17.
  • the sound-absorbing layer 17 can be made of a fibrous material, for example an acoustic grade polyester batt having polyester fibres with a fibre diameter of approximately 2 denier to 10 denier, depending upon the wavelengths and frequencies of sound which are required to be absorbed.
  • the sound-absorbing layer 17 may also include a percentage of polyester co-extrusion melt fibre ranging from 5% to 10% to ensure that the surface of the sound-absorbing layer 17 facing the transmission tunnel 19 is relatively smooth with no loose fibres.
  • the sound-absorbing layer 17 typically has a minimum surface density of 800 grams per metre square and a thickness of about 5 mm or greater.
  • a multilayered acoustic shield 13 is illustrated prior to being suitably shaped and mounted to a transmission tunnel 19.
  • the shield 13 shown in Figure 10a includes an outer portion and an inner portion.
  • the outer portion of the shield 13 in this embodiment includes a support layer 15 which consists of the sheet material 1.
  • the outer portion further includes a metallic foil 21.
  • the inner portion includes a sound-absorbing layer 17 and a backing layer 14. The sound- absorbing layer 17 is located between the backing layer 14 and the metallic foil 21.
  • the backing layer 14 is particularly useful for capturing loose fibres when the sound-absorbing layer 17 contains no polyester co-extrusion melt fibres.
  • the backing layer 14 advantageously protects the sound-absorbing layer 17 and provides a relatively smooth surface which enables a plurality of acoustic shields 13 to be stacked one upon the other without the sound-absorbing layer 17 be snagged on the outer portion of an adjacent acoustic shield 13.
  • the backing layer 14 may be a polymer, for example polypropylene or a film based material.
  • the backing layer 14 may also be an aluminium film, or paper.
  • the multilayer acoustic shield 13 is fastened to the vehicle floorpan at a series of spaced locations across the width of the shield 13 by fasteners 23 which may be of any suitable form, for example rivets, studs, nuts, self-tapping screws or the like. Whilst three fasteners 23 are shown in Figure 9, the acoustic shield 13 can instead be secured with only two fasteners 23 at opposing sides of the transmission tunnel 19.
  • the acoustic shield 13 can extend longitudinally along the transmission tunnel 19, directly above the transmission of the vehicle, and may have additional fasteners 23 at spaced locations along the length of the acoustic shield 13.
  • the acoustic shield 13 has some degree of flexibility to enable the shield 13 to maintain conformance with the curvature of the underside of the transmission tunnel 19 and compress the sound-absorbing layer 17. If the acoustic shield 13 does not have a backing layer 14, the sound-absorbing layer 17 is compressed against the transmission tunnel 19, as shown in Figure 9. Alternatively, if the acoustic shield 13 includes a backing layer 14, the backing layer 14 presses against the transmission tunnel 19 and the sound-absorbing layer 17 is compressed between the backing layer 14 and the outer portion of the shield 13. By compressing the sound-absorbing layer 17, the shield 1 can be of a minimal thickness. Selected sections of the acoustic shield 13 can also be compressed to create strengthening ribs 12 which may extend longitudinally of the shield 1. Further, the compressibility of the sound-absorbing layer 17 enables the shield 13 to conform with the shape of any protrusions within the transmission tunnel 19, for example cables, ducts, wires 25 and the like.
  • the graph in Figure 11 shows the absorption coefficient of various samples at a range of frequencies.
  • the first sample is a non woven polyester sound-absorbing layer having a surface density of 1200 grams per square metre.
  • the second sample is a planar support layer in combination with the polyester sound-absorbing layer of sample one.
  • the support layer consists of a sheet of aluminium with a thickness of 0.5mm.
  • the sheet has a plurality of circular apertures each having a diameter of 3mm. The apertures provide the sheet with an open area of 33%.
  • the third sample is a support layer comprising of the sheet material of the present invention in combination with the polyester sound- absorbing layer of sample one.
  • the sheet material of the third sample is aluminium with a thickness of 0.5mm and has indentations which make the overall thickness of the support layer 3mm. Each indentation has sidewalls which converge towards a circular aperture of 3mm in diameter. Each indention has a diameter of 5mm which reduces to 3mm at the aperture.
  • the graph in Figure 11 shows that a greater proportion of sound is absorbed by the third sample, i.e. the sheet material of the present invention in combination with the polyester sound- absorbing layer, particularly at frequencies below 1000Hz.
  • the present invention advantageously provides a sheet material 1 which is particularly well suited for use as an outer, main structural layer of an acoustic shield.
  • the sidewalls 7 of the indentations 3 are able to increase the transmission of sound to the underlying layers of the acoustic shield by diverting and focusing sound waves incident of the sidewalls 7 towards the apertures 5 rather than reflecting sound waves of the sidewalls 7 into the surrounding environment. Accordingly the number and diameter of the apertures 5 can be reduced without a corresponding reduction in the acoustic performance of the shield 1 being made. Further, the shield 1 is able to retain its ability to adequately protect the underlying layers of the shield 1 from the surrounding environment.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Mechanical Engineering (AREA)
  • Multimedia (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)

Abstract

L'invention concerne un matériau en feuille (1) destiné à être utilisé en tant que couche dans un écran acoustique multicouche. La feuille (1) comprend plusieurs indentations, les indentations comprenant chacune une ouverture (5) et des parois latérales (7) qui convergent vers chaque ouverture d'indentation respective (5). Les ouvertures (5) sont disposées pour venir en butée avec une couche adjacente d'un écran acoustique, pour guider de cette façon des ondes sonores incidentes sur les parois latérales (7) à travers les ouvertures (5) en direction de la couche adjacente. Le matériau en feuille (1) est particulièrement approprié pour une utilisation dans un écran acoustique qui peut être monté sur un tunnel de transmission d'un véhicule à moteur.
PCT/AU2008/000707 2007-05-21 2008-05-20 Matériau en feuille destiné à être utilisé dans un écran acoustique multicouche WO2008141380A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007902701 2007-05-21
AU2007902701A AU2007902701A0 (en) 2007-05-21 A Sheet Material for use in a Multilayered Acoustic Shield

Publications (1)

Publication Number Publication Date
WO2008141380A1 true WO2008141380A1 (fr) 2008-11-27

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2941902A1 (fr) * 2009-02-09 2010-08-13 Cera Dispositif de protection acoustique et thermique vis a vis d'une source sonore et chaude disposee dans un vehicule automobile
WO2010085422A3 (fr) * 2009-01-22 2010-10-07 Electrolux Home Products, Inc. Panneau acoustique
US8020662B1 (en) 2010-07-22 2011-09-20 Electrolux Home Products, Inc. Acoustic base tray for a dishwashing appliance, and associated method
FR2983815A1 (fr) * 2011-12-12 2013-06-14 Peugeot Citroen Automobiles Sa Dispositif ameliore de limitation de la propagation d'ondes acoustiques au sein d'un corps creux d'un vehicule automobile tel qu'un longeron du vehicule
EP2631449A1 (fr) * 2012-02-22 2013-08-28 ISOLITE GmbH Absorbeur acoustique
WO2014121421A1 (fr) * 2013-02-07 2014-08-14 Yao Qingyun Panneau insonorisant pour source sonore
EP2815688A1 (fr) * 2013-06-21 2014-12-24 Whirlpool Corporation Appareil ménager, en particulier un sèche-linge, lave-linge ou lave-vaisselle
US9850657B2 (en) 2016-02-25 2017-12-26 Steelcase Inc. Acoustic panel for partition wall assembly
US20180030896A1 (en) * 2015-02-18 2018-02-01 Mra Systems, Inc. Acoustic liners and method of shaping an inlet of an acoustic liner
US20210174780A1 (en) * 2019-12-10 2021-06-10 Hyundai Motor Company Holey plate and composite panel for sound absorption and sound insulation using the same

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US1554179A (en) * 1922-09-05 1925-09-15 Dahlberg & Company Sound-absorbing material for walls and ceilings
US4539245A (en) * 1984-04-24 1985-09-03 Fokker B.V. Sound attenuating structure
US6951264B2 (en) * 2003-03-04 2005-10-04 Lear Corporation Acoustically attenuating headliner and method for making same
US20050263346A1 (en) * 2002-07-31 2005-12-01 Toyota Jidosha Kabushiki Kaisha Sound-absorbing structure and sound-absorbing unit
US6996402B2 (en) * 2000-08-29 2006-02-07 Logan James D Rules based methods and apparatus for generating notification messages based on the proximity of electronic devices to one another
WO2006135164A1 (fr) * 2005-06-14 2006-12-21 Young-Ok Kim Panneau absorbant acoustique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1554179A (en) * 1922-09-05 1925-09-15 Dahlberg & Company Sound-absorbing material for walls and ceilings
US4539245A (en) * 1984-04-24 1985-09-03 Fokker B.V. Sound attenuating structure
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US6951264B2 (en) * 2003-03-04 2005-10-04 Lear Corporation Acoustically attenuating headliner and method for making same
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AU2010206948B2 (en) * 2009-01-22 2015-07-02 Electrolux Home Products, Inc. Acoustic panel
WO2010085422A3 (fr) * 2009-01-22 2010-10-07 Electrolux Home Products, Inc. Panneau acoustique
US8015848B2 (en) 2009-01-22 2011-09-13 Electrolux Home Products, Inc. Acoustic panel
FR2941902A1 (fr) * 2009-02-09 2010-08-13 Cera Dispositif de protection acoustique et thermique vis a vis d'une source sonore et chaude disposee dans un vehicule automobile
US8020662B1 (en) 2010-07-22 2011-09-20 Electrolux Home Products, Inc. Acoustic base tray for a dishwashing appliance, and associated method
FR2983815A1 (fr) * 2011-12-12 2013-06-14 Peugeot Citroen Automobiles Sa Dispositif ameliore de limitation de la propagation d'ondes acoustiques au sein d'un corps creux d'un vehicule automobile tel qu'un longeron du vehicule
EP2631449A1 (fr) * 2012-02-22 2013-08-28 ISOLITE GmbH Absorbeur acoustique
WO2014121421A1 (fr) * 2013-02-07 2014-08-14 Yao Qingyun Panneau insonorisant pour source sonore
EP2815688A1 (fr) * 2013-06-21 2014-12-24 Whirlpool Corporation Appareil ménager, en particulier un sèche-linge, lave-linge ou lave-vaisselle
US20180030896A1 (en) * 2015-02-18 2018-02-01 Mra Systems, Inc. Acoustic liners and method of shaping an inlet of an acoustic liner
US10563578B2 (en) * 2015-02-18 2020-02-18 Mra Systems, Llc Acoustic liners and method of shaping an inlet of an acoustic liner
US9850657B2 (en) 2016-02-25 2017-12-26 Steelcase Inc. Acoustic panel for partition wall assembly
US20210174780A1 (en) * 2019-12-10 2021-06-10 Hyundai Motor Company Holey plate and composite panel for sound absorption and sound insulation using the same

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