US20050241877A1 - Sound absorber comprising two parts delimiting a hollow space - Google Patents

Sound absorber comprising two parts delimiting a hollow space Download PDF

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Publication number
US20050241877A1
US20050241877A1 US10/519,265 US51926505A US2005241877A1 US 20050241877 A1 US20050241877 A1 US 20050241877A1 US 51926505 A US51926505 A US 51926505A US 2005241877 A1 US2005241877 A1 US 2005241877A1
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US
United States
Prior art keywords
sound absorber
molded part
absorber according
spacers
recesses
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/519,265
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English (en)
Inventor
Hans Czerny
Heinz Blomeling
Uwe Etterer
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.)
Carcoustics Techconsult GmbH
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
Assigned to CARCOUSTICS TECH CENTER GMBH reassignment CARCOUSTICS TECH CENTER GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BLOMELING, HEINZ, CZERNY, HANS RUDOLF, ETTERER, UWE
Publication of US20050241877A1 publication Critical patent/US20050241877A1/en
Abandoned legal-status Critical Current

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    • 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
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

Definitions

  • the invention relates to a sound absorber, especially for motor vehicles, comprising a molded part made of thermoplastic material and at least one second part which delimits a hollow space along with the molded part.
  • Such a sound absorber is known for example from DE 34 45 656 A1.
  • the known sound absorber is composed of an exterior foam layer of open-cell, air-pervious foam plastic, a sound-transparent stabilising layer connected areally thereto and a support layer connected to the edge and to the central area of the stabilising layer.
  • the stabilising layer and the support layer define a hollow space and each consist of thermoplastic material.
  • the stabilising layer is provided with openings which consist of holes punched by means of a needle tool from the foam side.
  • DE 298 03 675 U1 discloses various variants of a sound protection shield with a heavy layer provided with recesses or chambers, which is especially formed of polyurethane, polypropylene, polyolefin elastomers (POE) or EPDM.
  • the heavy layer is formed of EPDM, wherein the chambers are constructed as respectively pot-shaped in cross-section, together form a honeycomb-shaped structured structure and are covered with a metal or aluminium foil.
  • the DE 195 16 819 C2 describes a sound damping device which is especially intended for application to room-delimiting surfaces and has a cover layer arranged at a distance from the room-delimiting surface.
  • the cover layer comprises a first damping element for low acoustic frequencies and a second damping element for high acoustic frequencies.
  • the first damping element consists of a plate absorber in the form of a closed plastic film wherein the plate absorber is arranged at a distance from the room-delimiting surface by means of a frame-shaped spacer element consisting of foam, forming a cavity.
  • the second damping element on the other hand consists of a porous foam absorber which is arranged on the plate absorber and is connected thereto over the entire area.
  • the sound absorber having the features of claim 1 .
  • the sound absorber according to the invention thus is substantially constructed of a molded part made of thermoplastic material and at least one second part which with the molded part delimits a hollow space, wherein a plurality of pin-shaped or spike-shaped spacers, which project into the hollow space and are directed towards the second part are formed on the molded part.
  • the molded part has a plurality of recesses on the outside which each extend into a spacer.
  • said sound absorber has good media resistance.
  • An especially good media resistance and temperature resistance can be achieved if the molded part is produced by deep drawing of a polyester film, especially a PET film (polyethylene terephthalate film).
  • the spacers ensure that the spacing between the molded part and the second part and therefore the hollow space defined between the two parts does not vary or at any rate only slightly varies at high ambient temperatures or under the effects of heat.
  • temperature- or heat-induced changes in the shape of the foam layer frequently occur, especially if the foam layer is made of PP foam (polypropylene foam).
  • the molded part of the sound absorber according to the invention is flectionally elastic, has a certain mass and is excited to co-vibrate by sound waves incident thereon. In this case, some of the sound energy is converted into heat.
  • the air-filled hollow space between the molded part and the second part of the absorber acts as an elastic spring.
  • the sound absorber according to the invention is thus a spring-mass system.
  • the recesses formed on the outside of the molded part are acoustically effective since at least some of the sound waves incident on the sound absorber penetrate into the recesses and make the air contained therein vibrate to and fro. Some of the sound energy is consequently converted into heat as a result of friction effects. Compared with a corresponding sound absorber without such recesses, the volume of the hollow space of the sound absorber according to the invention and thus its overall height are reduced for the same acoustic performance (efficiency).
  • the spacers are formed as pin-shaped or spike-shaped and thus relatively small and compact. They barely reduce the acoustically effective volume of the air-filled hollow space of the sound absorber and barely even when they are formed in a relatively large number on the molded part. For example, more than 150, preferably more than 180 spacers per square decimetre are formed on the molded part.
  • the second part of the absorber according to the invention defining the air-filled hollow space is preferably formed of a heavy layer, a non-woven fabric layer, a foam layer and/or a textile layer.
  • the second part can especially be constructed as multi-layer, for example comprising a heavy mat and a further absorber layer made of non-woven fabric, foam or textile material.
  • the molded part is preferably constructed as cassette-shaped or dish-shaped, wherein the depth of the cassette or dish is preferably greater than the respective length of the spacer.
  • the second part for example, a heavy mat, can then be inserted into the molded part and terminate flush with the rear-side edge of the molded part. By this means the second part and the hollow space can be protected from dirt accumulation by dust or the like.
  • the molded part has a circumferential fixing flange.
  • the sound absorber according to the invention can then be affixed simply to bodywork parts and machine parts, for example, using screws, rivets, clamps or adhesives.
  • FIG. 1 is a cross-sectional view of a sound absorber according to the invention
  • FIG. 2 is a plan view of the outside of the sound absorber from FIG. 1 ,
  • FIG. 3 is a plan view of the outside of a sound absorber according to a second exemplary embodiment
  • FIG. 4 is a cross-sectional view of a sound absorber according to the invention according to a third exemplary embodiment
  • FIG. 5 is a cross-sectional view of a sound absorber according to the invention according to a fourth exemplary embodiment.
  • the sound absorber is made of a molded part 1 and at least one further acoustically effective part 2 .
  • the second part 2 is a heavy mat, preferably made of recycled material.
  • sound-absorbing materials such as non-woven fabrics, foams and acoustically effective textile mats can also be applied to the back of the molded part 1 .
  • the molded part 1 consists of thermoplastic material and was produced by deep drawing a corresponding air-impervious plastic film.
  • the plastic film is a polyester film and is preferably a PET film.
  • the molded part 1 is substantially cassette-shaped or dish-shaped and has a circumferential fixing flange 3 (see FIG. 2 ).
  • the fixing flange 3 can be provided with holes (not shown) which serve for the connection of screws, rivets, clamps, fixing naps or adhesives on the molded part 1 .
  • the molded part 1 Constructed on the inside of the molded part 1 is a plurality of spacers 4 which are substantially constructed as spike-shaped and are formed by means of a shaping tool having needle-shaped pins or the like. Accordingly, on its exposed outer side 5 the molded part 1 has a plurality of recesses 6 which each extend into a spacer 4 .
  • the spacers 4 and recesses 6 are preferably produced during the deep drawing of the molded part 1 . However, it is also possible to produce the spacers after the deep drawing of the cassette-shaped molded part 1 in a subsequent work process. It can be made out that the average outside diameter of the spacers 4 is smaller than their average length.
  • the cassette-shaped molded part 1 and the heavy mat as the second part 2 of the sound absorber define a hollow space 7 .
  • the spacers 4 project into the air-filled hollow space 7 and are directed towards the heavy mat 2 .
  • the recesses 6 are closed towards the hollow space 7 .
  • the spacers 4 are substantially the same length and extend as far as the heavy mat 2 .
  • the depth of the molded part 1 is greater than the respective length of the spacers 4 so that the heavy mat 2 is taken up in the molded part 1 .
  • the depth of the molded part 1 and the length or height of the spacers 4 are dimensioned such that the back side 8 of the heavy mat 2 terminates substantially flush with the back side (contact surface) of the fixing flange.
  • the spacers 4 are formed as substantially the same shape since they have substantially the same length or height and substantially the same average outside diameter.
  • the recesses 6 formed in the spacers 4 have substantially the same depth and substantially the same average inside diameter.
  • the spacers 4 and the recesses 6 are formed as distributed uniformly over the surface of the molded part 1 as shown in FIG. 2 .
  • the acoustic efficiency of the sound absorber according to the invention can be improved under corresponding usage conditions if the spacers 4 and recesses 6 are constructed as non-uniformly distributed over the surface of the molded part 1 , as shown schematically in FIG. 3 . Moreover, it can be advantageous if the recesses 6 have different internal diameters (see also FIG. 3 ).
  • the exemplary embodiment shown in FIG. 4 differs from the exemplary embodiment according to FIG. 1 in that inserted first into the cassette-shaped molded part 1 is a non-woven fabric layer 9 which abuts onto the tips of the spacers 4 .
  • the non-woven fabric layer 9 is followed by a second layer 2 , in the form of a heavy mat or a foam layer, whose back side 8 again terminates flush with the fixing flange 3 .
  • the invention is not restricted in its embodiment to the exemplary embodiments described hereinbefore. Rather, a plurality of variants are feasible which also in a fundamentally different embodiment make use of the inventive idea as defined in the appended claims. Thus, for example, it is also within the scope of the invention to fill the hollow space 7 in the area between the spacers 4 , partly with acoustically effective material, especially with heavy material.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Laminated Bodies (AREA)
  • Fluid-Damping Devices (AREA)
US10/519,265 2002-06-25 2003-06-25 Sound absorber comprising two parts delimiting a hollow space Abandoned US20050241877A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10228395.8 2002-06-25
DE10228395A DE10228395C1 (de) 2002-06-25 2002-06-25 Schall-Absorber
PCT/EP2003/006713 WO2004001718A1 (de) 2002-06-25 2003-06-25 Schall-absorber mit zwei einen hohlraum begrenzenden teilen

Publications (1)

Publication Number Publication Date
US20050241877A1 true US20050241877A1 (en) 2005-11-03

Family

ID=29414314

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/519,265 Abandoned US20050241877A1 (en) 2002-06-25 2003-06-25 Sound absorber comprising two parts delimiting a hollow space

Country Status (10)

Country Link
US (1) US20050241877A1 (es)
EP (1) EP1516318A1 (es)
JP (1) JP2005531022A (es)
CN (1) CN1662953A (es)
AU (1) AU2003278247A1 (es)
BR (1) BR0312049A (es)
DE (1) DE10228395C1 (es)
MX (1) MXPA04012835A (es)
WO (1) WO2004001718A1 (es)
ZA (1) ZA200410073B (es)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060169531A1 (en) * 2003-12-23 2006-08-03 Christine Volker Component that absorbs airborne sound
US20070017739A1 (en) * 2003-10-30 2007-01-25 Ichiro Yamagiwa Sound absorbing structure
US20070125595A1 (en) * 2005-12-02 2007-06-07 Canon Kabushiki Kaisha Image forming apparatus
US20070278035A1 (en) * 2006-06-01 2007-12-06 General Electric Company Thermal-acoustic enclosure
US20090038883A1 (en) * 2005-06-14 2009-02-12 Kim Young-Ok Sound-absorbing panel
US20090283356A1 (en) * 2006-07-20 2009-11-19 Kabushiki Kaisha Kobe Seiko Sho(Kobe Steel, Ltd.) Solid-borne sound reducing structure
US20100247945A1 (en) * 2009-03-30 2010-09-30 Gm Global Technology Operations, Inc. Sheet Metal Panel Shape for Low Sound Radiation
US20100307867A1 (en) * 2007-09-20 2010-12-09 Masanori Ogawa Buffering and Sound-Absorbing Member
US20110048850A1 (en) * 2008-05-05 2011-03-03 Alexander Jonathan H Acoustic composite
US20120145479A1 (en) * 2009-08-19 2012-06-14 Yukihiro Nishikawa Sound absorbing body
US20120155688A1 (en) * 2009-02-07 2012-06-21 Leena Rose Wilson Acoustic absorber, acoustic transducer, and method for producing an acoustic absorber or an acoustic transducer
US8474572B2 (en) * 2011-08-25 2013-07-02 General Electric Company Apparatus and method to attenuate vibration and acoustic noise
US20140182227A1 (en) * 2012-12-31 2014-07-03 Morris Hassan Unitary safety surface tiles and associated structures
US20150068836A1 (en) * 2012-06-12 2015-03-12 Gestion Soprema Canada Inc. Acoustic Core Which Can Be Built Into A Structure
CN112639960A (zh) * 2018-09-14 2021-04-09 ＭＴ－Ｔｅｃ合同会社 汽车用吸音材料

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200481328Y1 (ko) * 2015-11-09 2016-09-12 하만진 이송 수단용 흡음 구조체
KR101676969B1 (ko) 2015-12-24 2016-11-16 하만진 이송 수단용 방탄 및 흡음 챔버

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3819007A (en) * 1973-04-27 1974-06-25 Lockheed Aircraft Corp Controllable laminar sound absorptive structure
US4231447A (en) * 1978-04-29 1980-11-04 Rolls-Royce Limited Multi-layer acoustic linings
US4261433A (en) * 1979-02-12 1981-04-14 Herman Miller, Inc. Acoustical-reflective ceiling construction
US4479992A (en) * 1981-05-28 1984-10-30 Matec Holding Ag Sound absorbing structural element
US4715473A (en) * 1984-12-14 1987-12-29 Irbit Research & Consulting Ag Foam acoustic absorption member
US4771860A (en) * 1986-08-06 1988-09-20 Siemens Aktiengesellschaft Edge sealing means in a sound-absorbing cover for use in a sound-emitting body
US4821841A (en) * 1987-06-16 1989-04-18 Bruce Woodward Sound absorbing structures
US4926963A (en) * 1987-10-06 1990-05-22 Uas Support, Inc. Sound attenuating laminate for jet aircraft engines
US4957797A (en) * 1988-05-09 1990-09-18 Honda Giken Kogyo Kabushiki Kaisha Roof lining structure for motor vehicle
US5652415A (en) * 1992-11-07 1997-07-29 Helmut Pelzer Molded article designed to absorb airborne sound
US5744763A (en) * 1994-11-01 1998-04-28 Toyoda Gosei Co., Ltd. Soundproofing insulator
US5872341A (en) * 1993-08-26 1999-02-16 Erik Plinius Noise attenuating wall
US5969301A (en) * 1996-12-23 1999-10-19 Cullum, Jr.; Burton E. Acoustic diffuser panel system and method
US6125965A (en) * 1999-10-04 2000-10-03 Wang; Chao-Shun Acoustic board
US6186270B1 (en) * 1994-09-14 2001-02-13 M. Faist Gmbh & Co. Kg Layered sound absorber for absorbing acoustic sound waves

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4011705A1 (de) * 1990-04-11 1991-10-17 Freudenberg Carl Fa Luftschall absorbierendes formteil
JP3103516B2 (ja) * 1997-03-06 2000-10-30 盟和産業株式会社 内装用吸音部材
JP2000129816A (ja) * 1998-10-22 2000-05-09 Kobe Steel Ltd 吸音板構造
JP3492572B2 (ja) * 1999-11-16 2004-02-03 株式会社栗本鐵工所 吸音板

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3819007A (en) * 1973-04-27 1974-06-25 Lockheed Aircraft Corp Controllable laminar sound absorptive structure
US4231447A (en) * 1978-04-29 1980-11-04 Rolls-Royce Limited Multi-layer acoustic linings
US4261433A (en) * 1979-02-12 1981-04-14 Herman Miller, Inc. Acoustical-reflective ceiling construction
US4479992A (en) * 1981-05-28 1984-10-30 Matec Holding Ag Sound absorbing structural element
US4715473A (en) * 1984-12-14 1987-12-29 Irbit Research & Consulting Ag Foam acoustic absorption member
US4771860A (en) * 1986-08-06 1988-09-20 Siemens Aktiengesellschaft Edge sealing means in a sound-absorbing cover for use in a sound-emitting body
US4821841A (en) * 1987-06-16 1989-04-18 Bruce Woodward Sound absorbing structures
US4926963A (en) * 1987-10-06 1990-05-22 Uas Support, Inc. Sound attenuating laminate for jet aircraft engines
US4957797A (en) * 1988-05-09 1990-09-18 Honda Giken Kogyo Kabushiki Kaisha Roof lining structure for motor vehicle
US5652415A (en) * 1992-11-07 1997-07-29 Helmut Pelzer Molded article designed to absorb airborne sound
US5872341A (en) * 1993-08-26 1999-02-16 Erik Plinius Noise attenuating wall
US6186270B1 (en) * 1994-09-14 2001-02-13 M. Faist Gmbh & Co. Kg Layered sound absorber for absorbing acoustic sound waves
US5744763A (en) * 1994-11-01 1998-04-28 Toyoda Gosei Co., Ltd. Soundproofing insulator
US5969301A (en) * 1996-12-23 1999-10-19 Cullum, Jr.; Burton E. Acoustic diffuser panel system and method
US6125965A (en) * 1999-10-04 2000-10-03 Wang; Chao-Shun Acoustic board

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070017739A1 (en) * 2003-10-30 2007-01-25 Ichiro Yamagiwa Sound absorbing structure
US20060169531A1 (en) * 2003-12-23 2006-08-03 Christine Volker Component that absorbs airborne sound
US20090038883A1 (en) * 2005-06-14 2009-02-12 Kim Young-Ok Sound-absorbing panel
US20070125595A1 (en) * 2005-12-02 2007-06-07 Canon Kabushiki Kaisha Image forming apparatus
US20070278035A1 (en) * 2006-06-01 2007-12-06 General Electric Company Thermal-acoustic enclosure
US7604095B2 (en) * 2006-06-01 2009-10-20 General Electric Company Thermal-acoustic enclosure
US8109361B2 (en) * 2006-07-20 2012-02-07 Kobe Steel, Ltd. Solid-borne sound reducing structure
US20090283356A1 (en) * 2006-07-20 2009-11-19 Kabushiki Kaisha Kobe Seiko Sho(Kobe Steel, Ltd.) Solid-borne sound reducing structure
US20100307867A1 (en) * 2007-09-20 2010-12-09 Masanori Ogawa Buffering and Sound-Absorbing Member
US8381872B2 (en) * 2008-05-05 2013-02-26 3M Innovative Properties Company Acoustic composite
US20110048850A1 (en) * 2008-05-05 2011-03-03 Alexander Jonathan H Acoustic composite
US20120155688A1 (en) * 2009-02-07 2012-06-21 Leena Rose Wilson Acoustic absorber, acoustic transducer, and method for producing an acoustic absorber or an acoustic transducer
US9369805B2 (en) * 2009-02-07 2016-06-14 Wilson, Leena Rose Acoustic absorber, acoustic transducer, and method for producing an acoustic absorber or an acoustic transducer
US20100247945A1 (en) * 2009-03-30 2010-09-30 Gm Global Technology Operations, Inc. Sheet Metal Panel Shape for Low Sound Radiation
US20120145479A1 (en) * 2009-08-19 2012-06-14 Yukihiro Nishikawa Sound absorbing body
US8443935B2 (en) * 2009-08-19 2013-05-21 Yukihiro Nishikawa Sound absorbing body
US8474572B2 (en) * 2011-08-25 2013-07-02 General Electric Company Apparatus and method to attenuate vibration and acoustic noise
US20150068836A1 (en) * 2012-06-12 2015-03-12 Gestion Soprema Canada Inc. Acoustic Core Which Can Be Built Into A Structure
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
CN112639960A (zh) * 2018-09-14 2021-04-09 ＭＴ－Ｔｅｃ合同会社 汽车用吸音材料

Also Published As

Publication number Publication date
ZA200410073B (en) 2006-10-25
AU2003278247A1 (en) 2004-01-06
EP1516318A1 (de) 2005-03-23
DE10228395C1 (de) 2003-12-04
JP2005531022A (ja) 2005-10-13
MXPA04012835A (es) 2005-03-31
CN1662953A (zh) 2005-08-31
WO2004001718A1 (de) 2003-12-31
BR0312049A (pt) 2007-05-29

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AS Assignment

Owner name: CARCOUSTICS TECH CENTER GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CZERNY, HANS RUDOLF;BLOMELING, HEINZ;ETTERER, UWE;REEL/FRAME:016454/0514

Effective date: 20050107

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION