EP0962013B1 - Absorbeur quart d'onde a largeur de bande ajustable - Google Patents

Absorbeur quart d'onde a largeur de bande ajustable Download PDF

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Publication number
EP0962013B1
EP0962013B1 EP98900841A EP98900841A EP0962013B1 EP 0962013 B1 EP0962013 B1 EP 0962013B1 EP 98900841 A EP98900841 A EP 98900841A EP 98900841 A EP98900841 A EP 98900841A EP 0962013 B1 EP0962013 B1 EP 0962013B1
Authority
EP
European Patent Office
Prior art keywords
absorber
absorber according
resonators
resonator
sound
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.)
Expired - Lifetime
Application number
EP98900841A
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German (de)
English (en)
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EP0962013A1 (fr
Inventor
Robert Van Ligten
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.)
Autoneum International AG
Original Assignee
Rieter Automotive International AG
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Publication date
Application filed by Rieter Automotive International AG filed Critical Rieter Automotive International AG
Publication of EP0962013A1 publication Critical patent/EP0962013A1/fr
Application granted granted Critical
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Anticipated expiration legal-status Critical
Expired - Lifetime 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 ⁇ / 4 absorber Absorption of sound, such as that of machines, in particular of vehicles, is produced with a variety of tubular ⁇ / 4 resonators, the mouth of which is a sound reflecting Adjacent area.
  • Helmholtz absorbers It is also known to sound absorbers from a variety differently dimensioned Helmholtz resonators build. Such Helmholtz absorbers are in the Practice not enforced for various reasons. In particular such Helmholtz absorbers are difficult to dimension and / or fabricate and unsuitable to to be used in heavily polluting environments can.
  • This difference is essentially in the same time apparent mass and compressibility of the Air in the resonator and can be recognized in particular be that with the ⁇ / 4 resonators the resonance frequency is determined directly by the standing wave, its wavelength a quarter of the length of the tubular resonator is while the acoustic functioning and resonance of Helmholtz resonators using a spring-mass system must be described and determined.
  • GB 2 038 410 is an acoustically effective lining for Aircraft engines are known in which a variety of Helmholtz resonators can be combined with ⁇ / 4 resonators. These resonators will packed as tightly as possible to achieve the highest possible absorption.
  • the Openings of these resonators are with a perforated sheet or Non-woven fabric (with a relatively high acoustic resistance) covered to the acoustic coupling to the external sound field improve.
  • DE 94 08 118 discloses a sound absorber with a plurality of tubular recesses or channels, which are in a porous Absorber material are used.
  • the openings of the individual ⁇ / 4 tubes are covered with a porous foam, a nonwoven or a thin film.
  • the cavities are with another sound-absorbing material completely or partially filled.
  • Such a ⁇ / 4 absorber is described, for example, in WO 96/23294 and comprises a multiplicity of tubular resonators, the sound openings of which adjoin a surface, in such a way that the interaction zones (in which the incident sound wave and the standing waves formed in the individual resonators are located Waves destructively interfering) of the individual resonator openings are distributed as far as possible and at the same time do not substantially overlap.
  • Such ⁇ / 4 resonators basically absorb in a narrow frequency range around their resonance frequency f 0 . The width of this frequency range depends on the quality factor Q of the resonators, respectively. on the size of the energy losses that occur during resonance.
  • ⁇ / 4 absorbers can be embedded in any dense, reverberant material, such as, for example, metal, plastic, ceramic or glass.
  • any dense, reverberant material such as, for example, metal, plastic, ceramic or glass.
  • the energy losses are very small, ie the Q factor and the terminating impedance are very high. This leads to undesirably narrow resonance absorption curves.
  • a ⁇ / 4 absorber with the features of claim 1.
  • a heat sink is formed by any material which can absorb and dissipate heat from the temperature fluctuations in the air caused by pressure fluctuations. Those skilled in the field of noise protection are familiar with such materials.
  • a plug made of closed-pore viscoelastic foam Another practical possibility is seen in the use of a plug made of closed-pore viscoelastic foam. Another possibility is to bring about energy losses in the mouth area by installing a - low - air flow resistance, for example a "grid". In the embodiment of a deep-drawn film with a cover plate, such a “grid” can be produced by not removing the end to be opened, but rather only perforating it.
  • the present invention thus allows efficient for the first time ⁇ / 4 absorber industrial, i.e. inexpensive to manufacture.
  • the present invention also enables Construction of multifrequency absorbers in a simple way, by forming a wider resonant frequency band several differently dimensioned ⁇ / 4 resonators with increased sound energy loss in the muzzle according to the invention and floor area can be combined.
  • the principle of operation of the ⁇ / 4 absorber 1 according to the invention will be explained in more detail with reference to FIG. 1. It can be seen from this figure that the opening of the ⁇ / 4 resonator 2 lies in a sound-reflecting surface A.
  • Z o is used to denote the characteristic impedance of the air.
  • the sound impedance in the floor area 3 is referred to below as Z T and, in this simplified model, encompasses all sound energy losses inside the resonator (where Z T is proportional to the quality factor Q).
  • an interaction zone S 1 is formed on the reflecting surface A, in which the incident sound wave destructively interferes with the standing wave formed in the resonator 2.
  • this can be achieved by using soft, ie viscoelastic, closed-pore foams or other heat-exchanging materials in the bottom region of the ⁇ / 4 resonators, it being possible to choose all materials which lead to energy dissipation in the event of high pressure fluctuations.
  • an impedance ratio Z T / Z o 25 results for 100% absorption. Since Z o corresponds to the characteristic impedance of the air, that is has a value of approx. 400 Ns / m 3 , the required sound impedance Z T in the floor area is approx. 25 * 400 Ns / m 3 . Unfortunately, such high impedance values are difficult to achieve today.
  • the present invention also makes use of the knowledge that the following relationship applies to the resonance frequency for the impedance ratio Z T / Z o in the bottom region 3 and the impedance ratio Z o / Z mouth in the mouth region 4:
  • Z T / Z O Z O / Zünd
  • the frequency response respectively.
  • the absorption characteristic of this resonator has a bandwidth B C of only 5.1%.
  • FIG. 2b clearly shows the absorption behavior of the multifrequency absorber according to the invention.
  • an absorption behavior is shown, as shown by curve V.
  • the curve V results from the sum of the absorption characteristics S 1 , S 2 and S 3 generated by the individual narrowband absorbers.
  • This curve V shows the disadvantages of the multifrequency absorbers created with conventional narrowband absorbers.
  • This curve V follows the frequency response of the individual narrowband absorbers and drops sharply between the corresponding resonance frequencies f 1 , f 2 and f 3 , ie shows poor absorption in this intermediate range.
  • the ⁇ / 4 absorbers according to the invention it is possible to create a broad absorption band W with a constantly high absorption capacity. It is clear from FIG. 2b that the ⁇ / 4 absorbers according to the invention have a larger bandwidth B than the conventional narrowband absorbers. In the case of multifrequency absorbers, this leads to significant overlaps in the absorption characteristics T 1 , T 2 and T 3 of the individual ⁇ / 4 absorbers in the areas lying between the individual resonance frequencies f 1 , f 2 and f 3 .
  • Figures 3a, 3b, 3c and 3d show embodiments of the ⁇ / 4 absorber according to the invention. From Figure 3a it can be seen that the resonator 2 has a head part 5, in which has a variety of perforations, in particular Slots 6 is introduced. In addition to such a headboard 5 of such, can according to the invention a soft or in the bottom region 3 of the resonator 2 heat-exchanging material 7 may be attached (FIGS. 3a, 3c). In a further embodiment of the grid-like Headboard 5 can instead of slit-like perforations 6 holes 8 can also be provided (Figure 3b).
  • a suitable energy-dissipating Materials 7 are materials to be considered which has a large heat capacity relative to air and a have as large a surface as possible, such as open-pore Foam with small cells, cotton-like fibers, granular marerial or porous ceramic material. As soft Materials come in closed pore, viscoelastic Foams or other materials in question at high Pressure fluctuations dissipate energy.
  • Figure 4 shows another industrially in a simple manner Realizable multi-frequency absorber 9 with a variety different sized resonators 2.
  • this one from one Nonwoven fabric or foam carrier layer 10, in which tubular depressions 11 are formed.
  • These tubular depressions 11 can be with a Adhesive layer 12 to be coated on the one hand, the pores of the To close the carrier layer 10 in this area, and on the other hand, a cover film 13 on this carrier layer 10 to fix.
  • the holes 8 or slots according to the invention 6 can be introduced into this cover sheet 13.
  • the molded one Carrier layer 10 instead of being provided with a cover film 11, to be attached to a solid outer skin, e.g. a bonnet and the perforations 8, 6 in the deformed area 14 to mount the carrier layer 10.
  • the ⁇ / 4 absorbers according to the invention can be simplified Manufacture wise industrially.
  • these are extruded in a known manner, for example as extruded Plates with tube-like depressions, which are covered with a second plate become.
  • these can be according to the invention Absorber also with the help of deep-drawing or Manufacture injection molding technology.
  • In another form of production can directly corrugated material into which the perforations according to the invention introduced will be used.
  • ⁇ / 4 resonators according to the invention in a suitable manner can be dimensioned and / or differently dimensioned ⁇ / 4 resonators to form a broadband absorber can be combined with each other.
  • the resonators according to the invention individually, in Groups with similar resonators (monofrequency absorbers) or in groups with different dimensions Resonators (multifrequency absorbers) manufactured and used can be.
  • the inventive Absorber also with conventional fibrous or foamed absorbers can be combined and in particular be coordinated so that this in the area of the absorption drop are effective against low frequencies.
  • Your preferred application is in land and aircraft seen just like transformers, generators, Gearboxes or other machines of any kind.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Building Environments (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Claims (10)

  1. Absorbeur quart d'onde (lambda/4) destiné à assurer l'absorption de bruits produits par des machines, en particulier des véhicules, comportant plusieurs résonateurs quart d'onde (lambda/4) tubulaires (2) dont les embouchures sont adjacentes à une surface de réflexion acoustique (A), les embouchures des différents résonateurs quart d'onde (2) étant espacées les unes des autres, de sorte que les zones d'interaction des différentes embouchures des résonateurs, dans lesquelles l'onde acoustique produite est soumise à une interférence destructrice avec les ondes stationnaires produites dans le résonateur, étant réparties de sorte à assurer une couverture de surface maximale, sans chevauchement important, caractérisé en ce que
       pour régler la largeur de bande (B) de la réponse de fréquence de résonance (C, D) des différents résonateurs quart d'onde (2), ceux-ci comportent des moyens destinés à modifier les pertes d'énergie acoustique dans la région d'embouchure (4), ces moyens présentant une basse résistance au flux d'air, correspondant à peu près à celle d'une grille à grandes mailles.
  2. Absorbeur quart d'onde selon la revendication 1, caractérisé en ce que les moyens (6) destinés à modifier les pertes d'énergie dans la région d'embouchure (4) englobent une partie de tête (5) avec un grand nombre de perforations en forme de fentes (6).
  3. Absorbeur quart d'onde selon la revendication 1, caractérisé en ce que les moyens (8) destinés à modifier la perte d'énergie dans la région d'embouchure (4) englobent une partie de tête (5) comportant un grand nombre de perforations en forme de trous (8).
  4. Absorbeur quart d'onde selon la revendication 1, caractérisé en ce que les moyens (6, 8) destinés à modifier la perte d'énergie dans la région d'embouchure (4) englobent une partie de tête en forme de grille (5).
  5. Absorbeur quart d'onde selon l'une des revendications 2 à 4, caractérisé en ce que la partie de tête (5) fait partie intégrante de l'absorbeur quart d'onde (2).
  6. Absorbeur quart d'onde selon la revendication 1, caractérisé en ce qu'il comporte des moyens additionnels (7) destinés à modifier la perte d'énergie dans la région de fond (3) de l'absorbeur quart d'onde (2).
  7. Absorbeur quart d'onde selon la revendication 6, caractérisé en ce que les moyens (7) destinés à modifier la perte d'énergie dans la région de fond (3) englobent un matériau mou et/ou à échange thermique agencé dans la partie de fond du résonateur (2).
  8. Absorbeur quart d'onde selon l'une des revendications 1 à 7, caractérisé en ce que la région d'embouchure (4) et la région de fond (3) sont inclinées l'une par rapport à l'autre.
  9. Utilisation d'un absorbeur quart d'onde selon l'une des revendications 1 à 8 sous forme d'un absorbeur multifréquence.
  10. Utilisation d'un absorbeur quart d'onde selon l'une des revendications 1 à 8 sous forme d'un absorbeur monofréquence.
EP98900841A 1997-02-19 1998-02-04 Absorbeur quart d'onde a largeur de bande ajustable Expired - Lifetime EP0962013B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH00389/97A CH691942A5 (de) 1997-02-19 1997-02-19 Lambda/4-Absorber mit einstellbarer Bandbreite.
CH38997 1997-02-19
PCT/CH1998/000041 WO1998037541A1 (fr) 1997-02-19 1998-02-04 Absorbeur quart d'onde a largeur de bande ajustable

Publications (2)

Publication Number Publication Date
EP0962013A1 EP0962013A1 (fr) 1999-12-08
EP0962013B1 true EP0962013B1 (fr) 2002-01-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP98900841A Expired - Lifetime EP0962013B1 (fr) 1997-02-19 1998-02-04 Absorbeur quart d'onde a largeur de bande ajustable

Country Status (7)

Country Link
US (1) US6167985B1 (fr)
EP (1) EP0962013B1 (fr)
JP (1) JP3242931B2 (fr)
AR (1) AR011841A1 (fr)
CH (1) CH691942A5 (fr)
DE (1) DE59802792D1 (fr)
WO (1) WO1998037541A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202010006419U1 (de) 2010-05-04 2010-09-02 Emico Gmbh Breitbandig dämpfende Vorrichtung zur Schalldämpfung bei Industrieeinrichtungen, Großanlagen oder Maschinen
CN102013251A (zh) * 2009-09-07 2011-04-13 雅马哈株式会社 声学共鸣装置
WO2024153808A1 (fr) * 2023-01-20 2024-07-25 Hitachi Energy Ltd Dispositif de réduction du bruit provoqué par un transformateur et système
DE102026106494A1 (de) 2026-02-18 2026-05-07 Mercedes-Benz Group AG Radbremsvorrichtung für ein Fahrzeug, Fahrzeug und Verfahren zur Herstellung der Radbremsvorrichtung

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US6821597B1 (en) 1999-03-10 2004-11-23 Magee Rieter Automotive Systems Method for manufacturing a sound insulating structure and the structure produced thereby
JP3736790B2 (ja) * 2000-04-21 2006-01-18 三菱重工業株式会社 アクティブ遮音壁
US20020153199A1 (en) * 2001-02-09 2002-10-24 Schroer Daniel R. Sound absorbing foam
US6648100B2 (en) 2001-10-24 2003-11-18 Lear Corporation Method of tuning acoustical absorption in a vehicle interior
US7029242B2 (en) * 2003-11-14 2006-04-18 Tecumseh Products Company Hermetic compressor with one-quarter wavelength tuner
US7497301B2 (en) * 2005-01-27 2009-03-03 Fleetguard, Inc. Tubular acoustic silencer
US10072256B2 (en) * 2006-05-22 2018-09-11 Abbott Products Gmbh Process for separating and determining the viral load in a pancreatin sample
WO2008154215A1 (fr) * 2007-06-11 2008-12-18 Bonnie Schnitta Dispositif acoustique architectural
JP5326472B2 (ja) * 2007-10-11 2013-10-30 ヤマハ株式会社 吸音構造
EP2085962A2 (fr) * 2008-02-01 2009-08-05 Yamaha Corporation Structure absorbant les sons et composant de véhicule doté de propriétés absorbant les sons
US20090223738A1 (en) * 2008-02-22 2009-09-10 Yamaha Corporation Sound absorbing structure and vehicle component having sound absorption property
JP5326946B2 (ja) * 2008-09-02 2013-10-30 ヤマハ株式会社 音響構造体および音響室
JP5691197B2 (ja) * 2009-03-06 2015-04-01 ヤマハ株式会社 音響構造体、プログラムおよび設計装置
ITPI20100033A1 (it) * 2010-03-23 2011-09-24 Federico Nardini Dispositivo fonoassorbente particolarmente per barriere antirumore.
JP5958523B2 (ja) * 2010-05-17 2016-08-02 ヤマハ株式会社 音響構造体
US8393437B2 (en) * 2011-02-15 2013-03-12 Westinghouse Electric Company Llc Noise and vibration mitigation system for nuclear reactors employing an acoustic side branch resonator
JP2013015118A (ja) * 2011-07-06 2013-01-24 Toyota Boshoku Corp 吸音構造体
JP5810884B2 (ja) * 2011-12-15 2015-11-11 ヤマハ株式会社 音響構造体
FR3010225B1 (fr) * 2013-08-29 2016-12-30 Centre Nat Rech Scient Panneau acoustique absorbant
JP6327932B2 (ja) * 2014-05-07 2018-05-23 大成建設株式会社 ヘルムホルツ共鳴を利用した吸音器
US9618151B2 (en) 2015-02-26 2017-04-11 Adriaan DeVilliers Compact modular low resistance broadband acoustic silencer
US11047304B2 (en) * 2018-08-08 2021-06-29 General Electric Company Acoustic cores with sound-attenuating protuberances
DE102020100445A1 (de) 2020-01-10 2021-07-15 Viessmann Werke Gmbh & Co Kg Wärmetechnisches Gerät
US11854522B2 (en) * 2020-11-10 2023-12-26 Toyota Motor Engineering & Manufacturing North America, Inc. Sound absorbing structure having one or more acoustic scatterers attached to a transparent panel
US12589411B2 (en) * 2023-08-22 2026-03-31 Toyota Motor Engineering & Manufacturing North America, Inc. Systems for absorbing flexural waves acting upon a structure using monopole and dipole resonance

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FR2615994B1 (fr) * 1987-05-25 1989-07-28 Alsthom Revetement de paroi absorbant les ondes acoustiques en milieu liquide
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DE9408118U1 (de) * 1994-05-17 1995-09-14 M. Faist GmbH & Co KG, 86381 Krumbach Schallabsorber
CH690143A5 (de) * 1995-01-27 2000-05-15 Rieter Automotive Int Ag Lambda/4-Schallabsorber.
JP3119193B2 (ja) * 1997-03-07 2000-12-18 日産自動車株式会社 遮音板構造

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102013251A (zh) * 2009-09-07 2011-04-13 雅马哈株式会社 声学共鸣装置
DE202010006419U1 (de) 2010-05-04 2010-09-02 Emico Gmbh Breitbandig dämpfende Vorrichtung zur Schalldämpfung bei Industrieeinrichtungen, Großanlagen oder Maschinen
WO2011138004A1 (fr) 2010-05-04 2011-11-10 Emico Gmbh Dispositif d'atténuation large bande permettant d'atténuer le bruit lié aux équipements industriels, aux grandes installations ou aux machines
WO2024153808A1 (fr) * 2023-01-20 2024-07-25 Hitachi Energy Ltd Dispositif de réduction du bruit provoqué par un transformateur et système
DE102026106494A1 (de) 2026-02-18 2026-05-07 Mercedes-Benz Group AG Radbremsvorrichtung für ein Fahrzeug, Fahrzeug und Verfahren zur Herstellung der Radbremsvorrichtung

Also Published As

Publication number Publication date
AR011841A1 (es) 2000-09-13
JP3242931B2 (ja) 2001-12-25
JP2001512582A (ja) 2001-08-21
US6167985B1 (en) 2001-01-02
CH691942A5 (de) 2001-11-30
DE59802792D1 (de) 2002-02-28
WO1998037541A1 (fr) 1998-08-27
EP0962013A1 (fr) 1999-12-08

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