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WO2002083461A1 - Panneau insonorisant et son utilisation dans l'insonorisation de vehicules - Google Patents

Panneau insonorisant et son utilisation dans l'insonorisation de vehicules Download PDF

Info

Publication number
WO2002083461A1
WO2002083461A1 PCT/IB2002/001022 IB0201022W WO02083461A1 WO 2002083461 A1 WO2002083461 A1 WO 2002083461A1 IB 0201022 W IB0201022 W IB 0201022W WO 02083461 A1 WO02083461 A1 WO 02083461A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
acoustic tile
tile according
acoustic
constraining layer
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.)
Ceased
Application number
PCT/IB2002/001022
Other languages
English (en)
Inventor
Darren Aster Gunasekera
Marilyn De Alwis
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.)
Individual
Original Assignee
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
Priority to US10/475,290 priority Critical patent/US20040168853A1/en
Publication of WO2002083461A1 publication Critical patent/WO2002083461A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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

Definitions

  • the present invention relates to an acoustic tile, especially to an acoustic tile for use in vehicle sound proofing by damping vibration in a vehicle body panel.
  • Noise inside a motor vehicle arises from various sources. External sources include rain and wind impacting on the vehicle body panels and internal sources include the engine of the vehicle. Vibration of the body panels, such as the bonnet and the roof and door panels, is the source of considerable noise inside the vehicle.
  • press-formed fibrous composite sheets are prone to rotting when damp, as the material is not water resistant. They are very difficult to clean, being especially prone to trapping dirt, and abrasive handling will cause a measure of material disintegration.
  • One such material is a co-polymer comprising ethylene, vinyl acetate and acrylic and/or methacrylic acid.
  • a yet further proposal has been to use composite sheets comprising an elastomeric butyl polymer sheet bonded to a thin layer of non-elastomeric material on the surface that is to be positioned away from the panel.
  • damping materials While providing a degree of damping are not particularly effective and do not provide the required light weight, high performance systems that are desired in this technological age. They add considerably to the effective weight of the panel and thus detract from the overall performance of the vehicle. Furthermore they are not particularly useful in preventing transmission of noise from other sources.
  • an acoustic tile for damping vibration in a vehicle body panel comprises a base layer comprising a closed cell synthetic elastomeric foam bonded on one surface to a dense, stiff, non-cellular constraining layer.
  • the acoustic tile of the invention is a multi-layer sound and vibration-reducing overlay that can be applied to the doors, mudguards, roof, engine compartment bulkhead and other body panels of a vehicle.
  • the acoustic tile of the invention can be attached to the body panels by any desired means but for greatest efficiency the tiles should be held tight against the panel.
  • they are preferably adhesively adhered to the panels.
  • the tiles Preferably have a layer of pressure sensitive adhesive on the surface opposite the constraining layer.
  • the surface of the constraining layer may be patterned or textured or the constraining layer may include a covering or protecting layer, which may be patterned or textured.
  • the constraining layer may include a reinforcing layer between the constraining layer and any covering or protecting layer.
  • Preferably the constraining layer and any covering or protecting layer and any reinforcing layer form a single composite structure.
  • the acoustic tile of the invention uses noise and vibration cancellation principles.
  • the constraining layer may be compared to a weight on a spring attached to the body panel.
  • the vibrations in the panel are transmitted to the foam layer, which tries to transmit them to the constraining layer. Since the constraining layer is stiffer and more massive than the foam layer it does not move so readily and hence the energy of the vibration is converted from kinetic energy to potential energy and heat and hence the vibration is damped and its frequency reduced to more tolerable levels.
  • the elastomeric foam layer should be sufficiently flexible that it can readily conform to the contours of the body panels and is preferably a polyurethane foam, a polyethylene foam or a nitrile rubber foam.
  • the thickness of the foam layer is preferably between 3 mm and 15 mm but is more preferably about 6 mm.
  • the foam preferably has a density between 10 and 140 kg/m 3, more preferably between 60 kg/m 3 and 140 kg/m 3 and a modulus of elasticity between 4 x10 7 N/m 2 and 8 x10 7 N/m 2 . It should also have reasonable tear strength and be fire retardant or self-extinguishing. In addition it should be resistant to UV, ozone, mildew and fungus normal motor vehicle fluids.
  • a 6mm layer having an area of 200 mm x 120 mm has a compliance between 1 x 10 "9 and 10 x 10 "9 m/N, preferably between 2 x 10 "9 and ⁇ 'x 10 '9 m/N.
  • the constraining layer simply adds mass to the system and may be a layer of any material that ensures that the moment of inertia of the layer is such it will not move readily when the foam layer is vibrated by the vibrations in the panel to which the tile is attached.
  • the constraining layer although stiffer than the foam layer must not be so stiff that the tile cannot be conformed to the contours of the body panels. It should also have high tear and puncture resistance.
  • the thickness of the constraining layer is preferably between 1 mm and 15 mm and will usually be about 3 mm.
  • the material of the constraining layer preferably has a density between 200 kg/m 3 and 500 kg/m 3 , more preferably between 300 kg/m 3 and 375 kg/m 3
  • the mass ratio of the constraining layer to the foam layer is preferably from 2:1 to 10:1 , more preferably from 5:1 to 7:1.
  • the acoustic tile of the invention Because of the manner in which the acoustic tile of the invention operates, it only requires a few small pieces of tile on any given body panel to make a dramatic difference to the vibration characteristics of the panel.
  • each tile is in two parts with interlocking fingers so that the area of coverage of the tile can be increased by drawing the two parts apart while retaining contact between at least the ends of the fingers.
  • Fig. 1 is a section through an acoustic tile according to one embodiment of the invention.
  • Fig. 2 is a plan view of a preferred form of the tile shown in Fig. 1
  • Fig. 3 shows one way in which the acoustic tiles can be applied to vehicle body panels.
  • Fig. 4 is a graph showing typical performance characteristics of a vehicle body panel fitted with the acoustic tile.
  • the acoustic tile 1 comprises a base layer 11 of closed cell fire retardant nitryl rubber and a constraining layer 12 of a phase inverted distilled bitumen compound, the continuous phase of which is formed of. elastomeric and plastomeric polymers in which the bitumen is dispersed, a reinforcing layer 13 of a composite, high weight, rot-proof, non-woven polyester fabric, stabilized with fiberglass mat and a protective layer 14of embossed polyethylene.
  • the layers 12, 13 and 14 are shown in the drawing as separate layers the three layers, in practice is a composite structure.
  • Base layer 11 is 6 mm thick.
  • the nitryl foam has a density of 100 kg/m 2 , a modulus of elasticity of 7.6 x 10 7 N/m 2 , a compliance of 3.3x10 "9 m/N for an area of 200 mm x 120mm and a tear strength of 2445 N/m
  • Constraining layer 12, together with layers 13 and 14, is 3 mm thick.
  • the composite structure of layers 12, 13 and 14 has a density of 370 kg/m 3 .
  • a tile of size approximately 200 mm x 120 mm which is a convenient size both for packing and for application, has a weight of approximately 110 grams so that the application of 36 tiles, which is more than adequate for the average motor car, will only result in a weight increase of about 4 kilograms.
  • tile 1 On its opposite surface tile 1 has a layer 15 of pressure sensitive adhesive.
  • tile 1 is pre-cut during manufacture to give two equal sized pieces 2 and 3 with interlocking fingers 4 and 5, respectively.
  • fingers 4 and 5 By pulling pieces 2 and 3 apart, while retaining fingers 4 and 5 in contact, preferably over at least 3 cm of the length of the fingers, the effective length and coverage of a tile 1 can be greatly increased. Fingers 4 and 5 will be fully engaged for packaging.
  • Fig. 3 As shown in Fig. 3, to be effective the tiles do not have to be applied over the entire surface of a body panel of a vehicle. A number of tiles, as shown in Fig. 2 can be spaced over the surface of any desired body panel.
  • a series of tests were carried out to measure the effectiveness of the acoustic tile of the invention by comparing the acoustic characteristics of an undamped metal panel with those of the same metal panel to which a single tile of the type shown in Fig. 2 has been applied.
  • the plate was 0.25 mm thick, 45.7 cm wide and 48.3 cm long.
  • the tile had an area of 200 mm x 120 mm and was expanded by drawing the two pieces apart until 30 mm of the fingers 4, 5 remained overlapping giving a coverage area of 397 mm x 200 mm.
  • the plate thus has an area approximately 9 times the area covered by the tile.
  • the metal panel was mounted onto the open end of a medium density fiberboard box 45.7 cm x 48.3 cm x 50.8 cm with a thickness of 12 mm and was securely attached on all four edges to the box.
  • An audio source generating a 50 Hz sinusoidal signal is placed inside the box to generate an audio signal to cause the metal panel to vibrate.
  • the resulting panel vibrations cover the full spectrum (20Hz to 20,000Hz) audible to the human ear.
  • a calibrated microphone was centrally positioned 3 cm above the metal plate to record near field sound pressure levels.
  • the acoustic signature and reverberation strength of the panel with and without the expanded acoustic tile attached were captured by measuring the frequency spectrum from 20 Hz to 4,000 Hz.
  • the resulting data recorded are an average figure obtained from 100 sampling runs. The results are depicted graphically in FIG. 4.
  • the acoustic tile has significantly suppressed manifested panel frequencies from 50 Hz onwards with the region between 80 Hz to 3150 Hz registering the most impressive suppression.
  • reductions in excess of 40 dB are registered in some areas; this represents an energy level drop of more than 10000 times between a panel without an acoustic tile and one that has the acoustic tile attached. Since the decibel scale is logarithmic a 40 dB reduction therefore corresponds to a reduction in perceived volume of sixteen times the reference audible volume.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Laminated Bodies (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

L'invention concerne un panneau insonorisant servant à amortir des vibrations dans un panneau de carrosserie de véhicules. Ce panneau insonorisant comprend une couche de base (11) renfermant une mousse d'élastomère synthétique à alvéoles fermés, liée sur une surface d'une couche de contrainte non alvéolaire, dense et rigide (12). Ladite couche de base (11) renferme, de préférence, un caoutchouc mousse nitrile et ladite couche de contrainte comporte, de préférence, un mélange bitume-polymère élastomère/plastomère.
PCT/IB2002/001022 2001-04-02 2002-04-02 Panneau insonorisant et son utilisation dans l'insonorisation de vehicules Ceased WO2002083461A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/475,290 US20040168853A1 (en) 2001-04-02 2002-04-02 Acoustic tile and its use in vehicle sound proofing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
MYPI20011553A MY140920A (en) 2001-04-02 2001-04-02 An acoustic tile
MYPI20011553 2001-04-02

Publications (1)

Publication Number Publication Date
WO2002083461A1 true WO2002083461A1 (fr) 2002-10-24

Family

ID=19749507

Family Applications (1)

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PCT/IB2002/001022 Ceased WO2002083461A1 (fr) 2001-04-02 2002-04-02 Panneau insonorisant et son utilisation dans l'insonorisation de vehicules

Country Status (3)

Country Link
US (1) US20040168853A1 (fr)
MY (1) MY140920A (fr)
WO (1) WO2002083461A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1459939A1 (fr) * 2003-03-20 2004-09-22 Intier Automotive Näher GmbH Système d'insonorisation pour un véhicule
EP1457611A3 (fr) * 2003-03-13 2006-09-06 Bayer MaterialScience AG Elément de construction pour isolation thermique et acoustique
US7288290B2 (en) 2004-05-26 2007-10-30 Ppg Industries Ohio, Inc. Process for applying multi-component composite coatings to substrates to provide sound damping and print-through resistance

Families Citing this family (31)

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Publication number Priority date Publication date Assignee Title
US7181891B2 (en) * 2003-09-08 2007-02-27 Quiet Solution, Inc. Acoustical sound proofing material and methods for manufacturing same
US8495851B2 (en) 2004-09-10 2013-07-30 Serious Energy, Inc. Acoustical sound proofing material and methods for manufacturing same
US7921965B1 (en) 2004-10-27 2011-04-12 Serious Materials, Inc. Soundproof assembly and methods for manufacturing same
US7798287B1 (en) * 2005-01-20 2010-09-21 Serious Materials, Inc. Acoustical ceiling panels
DE102005049570B3 (de) * 2005-10-17 2007-04-05 Cellofoam Gmbh & Co. Kg Schallabsorbierendes Material
US8029881B2 (en) * 2005-11-04 2011-10-04 Serious Energy, Inc. Radio frequency wave reducing material and methods for manufacturing same
US20080171179A1 (en) * 2007-01-11 2008-07-17 Quiet Solution, Llc Low embodied energy wallboards and methods of making same
US7987645B2 (en) * 2007-03-29 2011-08-02 Serious Materials, Inc. Noise isolating underlayment
US9388568B2 (en) 2007-04-06 2016-07-12 Pacific Coast Building Products, Inc. Acoustical sound proofing material with improved fracture characteristics and methods for manufacturing same
US7883763B2 (en) 2007-04-12 2011-02-08 Serious Materials, Inc. Acoustical sound proofing material with controlled water-vapor permeability and methods for manufacturing same
US8424251B2 (en) 2007-04-12 2013-04-23 Serious Energy, Inc. Sound Proofing material with improved damping and structural integrity
US8397864B2 (en) * 2007-04-24 2013-03-19 Serious Energy, Inc. Acoustical sound proofing material with improved fire resistance and methods for manufacturing same
US8181738B2 (en) * 2007-04-24 2012-05-22 Serious Energy, Inc. Acoustical sound proofing material with improved damping at select frequencies and methods for manufacturing same
US10174499B1 (en) 2007-05-01 2019-01-08 Pacific Coast Building Products, Inc. Acoustical sound proofing material for architectural retrofit applications and methods for manufacturing same
US20080286609A1 (en) * 2007-05-15 2008-11-20 Surace Kevin J Low embodied energy wallboards and methods of making same
US20100101457A1 (en) * 2007-05-25 2010-04-29 Surace Kevin J Low embodied energy sheathing panels and methods of making same
US20090000245A1 (en) * 2007-06-28 2009-01-01 Tinianov Brandon D Methods of manufacturing acoustical sound proofing material
US7908818B2 (en) * 2008-05-08 2011-03-22 Serious Materials, Inc. Methods of manufacturing acoustical sound proofing materials with optimized fracture characteristics
US9387649B2 (en) 2007-06-28 2016-07-12 Pacific Coast Building Products, Inc. Methods of manufacturing acoustical sound proofing materials with optimized fracture characteristics
US7799410B2 (en) * 2007-06-30 2010-09-21 Serious Materials, Inc. Acoustical sound proofing material with improved damping at select frequencies and methods for manufacturing same
US7914914B2 (en) * 2007-06-30 2011-03-29 Serious Materials, Inc. Low embodied energy sheathing panels with optimal water vapor permeance and methods of making same
US8337993B2 (en) * 2007-11-16 2012-12-25 Serious Energy, Inc. Low embodied energy wallboards and methods of making same
US8590272B2 (en) 2010-06-07 2013-11-26 Georgia-Pacific Gypsum Llc Acoustical sound proofing materials and methods of making the same
EP2474971A1 (fr) * 2010-12-16 2012-07-11 Autoneum Management AG Matériau amortisseur à couche contrainte
EP2819122B1 (fr) * 2012-07-12 2016-11-30 Howa Textile Industry Co., Ltd. Corps d'insonorisation et isolateur pour automobile
KR101488308B1 (ko) * 2013-05-06 2015-01-30 현대자동차주식회사 자동차용 흡차음 강화보드 및 이의 제조방법
DE102014210910A1 (de) * 2014-06-06 2015-12-17 Faist Chemtec Gmbh Vorrichtung und Verfahren zur Entdröhnung eines Bauteils
CA2988547C (fr) 2016-12-15 2021-01-26 Certainteed Gypsum, Inc. Panneaux de platre et leurs methodes de fabrication
CA3182566A1 (fr) 2017-09-26 2019-04-04 Certainteed Gypsum, Inc. Plaques de platre ayant des couches internes et leurs procedes de fabrication
CN111433421B (zh) 2017-09-28 2022-02-15 瑟登帝石膏公司 灰泥板及其制备方法
FI3688245T3 (fi) 2017-09-30 2023-06-14 Certainteed Gypsum Inc Kapenevia kipsilevyjä ja menetelmiä niiden valmistamiseksi

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EP0466513A2 (fr) * 1990-07-12 1992-01-15 Nihon Sekiso Kogyo Kabushiki Kaisha Matériau amortisseur
FR2667430A3 (fr) * 1990-09-29 1992-04-03 Weinsheim Gmbh Chem Werke Panneaux insonorisants.

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US4851271A (en) * 1987-10-01 1989-07-25 Soundwich Incorporated Sound dampened automotive enclosure such as an oil pan
US6789645B1 (en) * 1999-06-09 2004-09-14 The Dow Chemical Company Sound-insulating sandwich element

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EP0063715A1 (fr) * 1981-04-20 1982-11-03 Nissan Motor Co., Ltd. Panneau isolant phonique
EP0466513A2 (fr) * 1990-07-12 1992-01-15 Nihon Sekiso Kogyo Kabushiki Kaisha Matériau amortisseur
FR2667430A3 (fr) * 1990-09-29 1992-04-03 Weinsheim Gmbh Chem Werke Panneaux insonorisants.

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1457611A3 (fr) * 2003-03-13 2006-09-06 Bayer MaterialScience AG Elément de construction pour isolation thermique et acoustique
US7179846B2 (en) 2003-03-13 2007-02-20 Bayer Materialscience Ag Soundproofing and thermally insulating structural element
EP1459939A1 (fr) * 2003-03-20 2004-09-22 Intier Automotive Näher GmbH Système d'insonorisation pour un véhicule
US7288290B2 (en) 2004-05-26 2007-10-30 Ppg Industries Ohio, Inc. Process for applying multi-component composite coatings to substrates to provide sound damping and print-through resistance

Also Published As

Publication number Publication date
MY140920A (en) 2010-02-12
US20040168853A1 (en) 2004-09-02

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