EP0962013A1 - Absorbeur quart d'onde a largeur de bande ajustable - Google Patents

Absorbeur quart d'onde a largeur de bande ajustable

Info

Publication number
EP0962013A1
EP0962013A1 EP98900841A EP98900841A EP0962013A1 EP 0962013 A1 EP0962013 A1 EP 0962013A1 EP 98900841 A EP98900841 A EP 98900841A EP 98900841 A EP98900841 A EP 98900841A EP 0962013 A1 EP0962013 A1 EP 0962013A1
Authority
EP
European Patent Office
Prior art keywords
absorber
resonator
absorber according
resonators
absorbers
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.)
Granted
Application number
EP98900841A
Other languages
German (de)
English (en)
Other versions
EP0962013B1 (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
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 Rieter Automotive International AG filed Critical Rieter Automotive International AG
Publication of EP0962013A1 publication Critical patent/EP0962013A1/fr
Application granted granted Critical
Publication of EP0962013B1 publication Critical patent/EP0962013B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

Definitions

  • the present invention relates to a ⁇ / 4 absorber for absorbing sound, such as that generated by machines, in particular vehicles, with a multiplicity of tubular ⁇ / 4 resonators, the mouth of which adjoins a sound-reflecting surface.
  • Fiber insulation materials or open-pore foams are used, which are placed around the noise sources or. be installed in their immediate vicinity.
  • their use is restricted in heavily polluting environments, since these open-pore materials quickly accumulate with oil, water or dust and thereby lose their sound-absorbing effectiveness.
  • This difference lies essentially in the simultaneously appearing mass and compressibility of the air in the resonator and can be recognized in particular by the fact that in the ⁇ / 4 resonators the resonance frequency is determined directly by the standing wave, the wavelength of which is a quarter of the length of the is a tubular resonator, while the acoustic functioning and resonance of Helmholtz resonators has to be described and determined by a spring-mass system. In the case of practical versions of the Helmholtz resonators, various assumptions that are made for the pre-calculation of the resonance frequency cannot be realized.
  • the walls of the Helmholtz resonators cannot be built so stiff that they do not deform under the pressure fluctuations during resonance, or the mass of the air in the neck area of the Helmholtz resonators cannot be determined exactly.
  • the advantages of the ⁇ / 4 resonators compared to the Helmholtz resonators are essentially to be seen in the more precise predeterminability of the absorption effect, its lower risk of contamination and their simpler dimensioning and manufacture.
  • Such a ⁇ / 4 absorber is described, for example, in WO 96/23294 and comprises a large number 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 that in the individual resonators) trained standing 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 Q. The width of this frequency range depends on the quality factor Q of the resonators, respectively. from the big one 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.
  • a ⁇ / 4 absorber with the features of claim 1 and in particular by means of changing the sound energy losses, respectively.
  • the sound impedance Z mouth in the mouth area and / or the sound energy losses respectively.
  • the sound impedance Z ⁇ in the bottom area of the ⁇ / 4 resonators is provided.
  • the sound impedance Z mouth in the mouth region of the ⁇ / 4 resonators is increased, or respectively, by a perforated head part. generate additional energy losses in the floor area through the use of soft and / or heat-exchanging material in order to reduce Z ⁇ .
  • a heat sink with a large contact area with the air in the bottom region of the resonators, where the pressure fluctuations are very large.
  • 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. The expert Such materials are well known in the field of noise protection. Another practical possibility is seen in the use of a plug made of closed-pore viscoelastic foam. Another option is in the mouth area
  • a - low - air flow resistance e.g. a "grid”.
  • a “grid” can be produced by not removing the end to be opened, but rather only perforating it.
  • the present invention thus allows efficient ⁇ / 4 absorbers for the first time industrially, i.e. inexpensive to manufacture.
  • the present invention also enables the construction of multifrequency absorbers in a simple manner by combining a plurality of differently dimensioned ⁇ / 4 resonators with an increased acoustic energy loss in the mouth and / or bottom area to form a wider resonance frequency band.
  • Fig. 1 Schematic diagram of how the ⁇ / 4 resonators work
  • FIG. 3a View of a first embodiment of a resonator with a slotted head part for the ⁇ / 4 absorber according to the invention
  • 3d View of a special embodiment of a resonator in which the mouth area and the bottom area are inclined towards one another;
  • Fig. 4 cross section of a practical embodiment of the ⁇ / 4 absorber according to the invention.
  • the opening of the ⁇ / 4 resonator 2 lies in a sound-reflecting surface A.
  • Z Q is used to denote the characteristic impedance of the air.
  • the sound impedance in the floor area 3 is referred to below as Z- and, in this simplified model, encompasses all sound energy losses inside the resonator (where Z ⁇ is proportional to the quality factor Q).
  • Z ⁇ is proportional to the quality factor Q.
  • an interaction zone S 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 interaction zone S- j ⁇ is also known as an "equivalent absorption area". With a 100% absorption, the sound impedance is essentially in the range of
  • Interaction zone S j correspond to the characteristic impedance Z 0 of the air. If one also assumes that in the case of 100% absorption in the mouth area 4 of the ⁇ / 4 resonator 2 the sound pressure and the particle flow are continuous, the following simple equation can be established:
  • this can be achieved by using soft, ie viscoelastic, closed-cell 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 .
  • the present invention also makes use of the knowledge that the resonance frequency for the
  • Impedance ratio Z ⁇ / Z 0 in the bottom area 3 and the impedance ratio Z 0 / Z mouth in the mouth area 4 the following relationship applies:
  • 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 lt 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 falls sharply between the corresponding resonance frequencies f lf f 2 and f 3 ⁇ t, ie shows a 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. This leads in multifrequency absorbers to substantial overlaps of the absorption characteristics T x , T 2 and T 3 of the individual ⁇ / 4 absorbers in the areas between the individual resonance frequencies f lf f 2 and f 3 . These overlaps mean that the sum W of the absorptions lf T 2 and T 3 generated by the individual absorbers according to the invention also leads to an almost 100% absorption in the region between the resonance frequencies f lt f 2 and f 3 . The curve W shows this clearly. This also makes it clear that multi-frequency absorbers with any absorption characteristic can be created with the ⁇ / 4 absorbers according to the invention.
  • Figures 3a, 3b, 3c and 3d show embodiments of the ⁇ / 4 absorber according to the invention.
  • the resonator 2 has a head part 5, in which a multiplicity of perforations, in particular slots 6, are introduced.
  • a soft or heat-exchanging material 7 can be attached to the bottom region 3 of the resonator 2 (FIGS. 3a, 3c).
  • holes 8 can also be provided instead of slit-like perforations 6 (FIG. 3b).
  • the geometrical design of the resonator 2, the choice of the heat-exchanging material 7 and the shape, dimensioning and number of perforations 6, 8 are in the range of the usual professional action.
  • a special embodiment is shown in FIG. 3d, in which the ⁇ / 4 resonator is designed as a spatial body with two trapezoidal side surfaces. This leads to the mouth region 4 and the base region 3, or rather the opening surface and the base surface, being inclined towards one another. So that can. the area of the floor area 3 is enlarged in the intended manner and thus its discriminatory effectiveness is influenced. The same way range 4 are inclined.
  • Suitable energy-dissipating materials 7 are those materials which have a large thermal capacity and a surface which is as large as possible relative to air, such as, for example, open-cell foam with small cells, cotton wool-like fibers, granular material or porous ceramic material. Closed-pore, viscoelastic foams or other materials that dissipate energy in the event of high pressure fluctuations are suitable as soft materials.
  • FIG. 4 shows another multifrequency absorber 9 which can be implemented industrially in a simple manner and has a multiplicity of resonators 2 of different dimensions.
  • this has a carrier layer 10 made of a nonwoven fabric or foam, into which tubular depressions 11 are formed. These tubular depressions 11 can be coated with an adhesive layer 12, on the one hand to close the pores of the carrier layer 10 in this area, and on the other hand to attach a cover film 13 to this carrier layer 10.
  • the holes 8 or slots 6 according to the invention can be made in this cover film 13.
  • the shaped carrier layer 10 instead of being provided with a cover film 11, on a solid outer skin, e.g. a bonnet, and the perforations 8, 6 in the deformed area 14 of the carrier layer 10.
  • the ⁇ / 4 absorbers according to the invention can be manufactured industrially in a simple manner.
  • these can be extruded in a known manner, for example as extruded plates with tube-like depressions, which are covered with a second plate.
  • these absorbers according to the invention can also be produced with the aid of deep-drawing or injection molding technology.
  • corrugated cardboard-like material into which the perforations according to the invention are made can be used directly.
  • the ⁇ / 4 resonators according to the invention can be suitably dimensioned and / or differently dimensioned ⁇ / 4 resonators can be combined with one another to form a broadband absorber.
  • the resonators according to the invention can be produced and used individually, in groups with resonators of the same type (monofrequency absorbers) or in groups with resonators of different dimensions (multifrequency absorbers).
  • the absorbers according to the invention can also be combined with conventional fibrous or foamed absorbers and, in particular, so coordinated that they are effective against low frequencies in the region of the absorption drop. Your preferred application is seen in land and aircraft as well as in 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)

Abstract

L'invention concerne un absorbeur de bruit quart d'onde à largeur de bande ajustable, qui comprend au moins un résonateur quart d'onde (2) dont la zone d'embouchure (4) présente une tête (5) perforée. Une version améliorée de cet absorbeur quart d'onde présente dans sa base inférieure (3) un matériau (7) non-rigide et/ou d'échange thermique.
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 true EP0962013A1 (fr) 1999-12-08
EP0962013B1 EP0962013B1 (fr) 2002-01-02

Family

ID=4185895

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)

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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
JP2011057000A (ja) * 2009-09-07 2011-03-24 Yamaha Corp 音響共鳴装置
ITPI20100033A1 (it) * 2010-03-23 2011-09-24 Federico Nardini Dispositivo fonoassorbente particolarmente per barriere antirumore.
DE202010006419U1 (de) 2010-05-04 2010-09-02 Emico Gmbh Breitbandig dämpfende Vorrichtung zur Schalldämpfung bei Industrieeinrichtungen, Großanlagen oder Maschinen
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
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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
EP0962013B1 (fr) 2002-01-02

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