EP0806030B1 - AMORTISSEUR DE BRUIT l/4 - Google Patents

AMORTISSEUR DE BRUIT l/4 Download PDF

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Publication number
EP0806030B1
EP0806030B1 EP96900025A EP96900025A EP0806030B1 EP 0806030 B1 EP0806030 B1 EP 0806030B1 EP 96900025 A EP96900025 A EP 96900025A EP 96900025 A EP96900025 A EP 96900025A EP 0806030 B1 EP0806030 B1 EP 0806030B1
Authority
EP
European Patent Office
Prior art keywords
sound
resonators
absorber according
sound absorber
tubular
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
EP96900025A
Other languages
German (de)
English (en)
Other versions
EP0806030A1 (fr
Inventor
Robert H. 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 EP0806030A1 publication Critical patent/EP0806030A1/fr
Application granted granted Critical
Publication of EP0806030B1 publication Critical patent/EP0806030B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 invention relates to a sound absorber according to the preamble of claim 1 and in particular a sound absorber for vehicles made of several tubular resonators, preferably with different lengths.
  • the walls of the box-shaped hollow body must be lightweight, ie very thin.
  • these thin-walled hollow bodies tend to deform due to the fluctuations in sound pressure and thus limit the quality factor of the resonator. Since the quality factor significantly influences the efficiency of the absorbers, the lightweight design also means that the acoustic effectiveness of these absorbers must always be reduced.
  • the acoustic effectiveness of these absorbers is fundamentally limited because the number of sound-absorbing openings is limited by the geometric expansion of the individual hollow bodies.
  • These hollow bodies typically have a base area of 15x15mm 2 to 60x60mm 2 , with a construction height of 5 to 25mm and a hole diameter of 4 to 11mm.
  • An insulating part is also known from DE-39'13'347, which has a multiplicity of cell-like cavities arranged closely next to one another, which are open on one side. With this insulating part, the energy of the impinging sound field is essentially irregular Reflections, absorption in the material and interference effects dissipated. These insulating parts are also only suitable to a limited extent for use in automobile construction, in particular because they are easily soiled and wear out quickly due to their lack of inherent stability.
  • GB-2'090'334 describes a damping device to dampen the generated in a nozzle drive aerodynamic vibrations, in which one Variety of tubular resonators is used.
  • the Length of these tubular resonators is dimensioned so that this is a quarter of the wavelength of this Corresponds to vibrations. This can result in a partial cancellation the pressure fluctuations in the mouth area of this Resonators are generated.
  • the damping device will not note that the to the individual resonator openings mutually influence interaction zones, and in particular the intended effect from the proposed one Arrangement can be canceled.
  • this object is achieved by a sound absorber solved with the features of claim 1, i.e. With a sound absorber made up of several tubular resonators, preferably with different lengths, the at least one sound opening to a sound reflecting one Adjacent area.
  • the tubular resonators can any position to the sound reflecting surface in particular, the resonators can also rest on this surface.
  • the ⁇ / 4 tubes can be arranged in any direction and also not necessarily a straight line must have.
  • the cross section of these tubes have any shape. It is for the Expert, the length of the tubes of the chosen shapes and Adapt resonance frequencies. Simply that However, those skilled in the art have shapes that are essentially the same Select cross-sectional area.
  • interaction zones A w below, the extent of which can be related to the respective sound opening area A o and the quality factor Q. It turns out that the ratio between the area of the interaction zone A w and the sound opening area A o is proportional to the quality factor Q.
  • Q k A w A O
  • the aim of the embodiments according to the invention to ensure that the individual interaction zones are distributed as widely as possible and at the same time do not substantially overlap, since such an overlap reduces the above-mentioned sound pressure gradient and thus reduces the dissipating local air flows.
  • the openings of the tubular resonators are preferably distributed over the corner points of an imaginary network of isosceles triangles. If sound absorption over a wide frequency range is desired, several groups of differently tuned tube absorbers can be interleaved. Likewise, the combination of the ⁇ / 4 absorbers according to the invention with conventional absorbers can be quite useful for certain applications.
  • the individual are in the preferred field of application tubular resonators on a sound field in the area tuned from 1 - 2 kHz, i.e. have a quarter wavelength appropriate length of approx. 80 - 40 mm.
  • standing waves can form in these ⁇ / 4 resonators, compared to that reflected in the mouth area Wavefront of the same wavelength out of phase by ⁇ / 2 are and interfere destructively with it.
  • the ⁇ / 4 absorber according to the invention has at least a group of tubular resonators of different Length on. It doesn't matter whether the sound openings are on the front or on the jacket side are.
  • the individual Resonators distributed on a surface.
  • the effectiveness the mechanism shown also largely depends on the sound reflecting property of the cavity educational material. Soft and compliant materials lead to losses in reflection and impair the above absorption mechanism. It is therefore understood that only for the resonators according to the invention airtight, smooth and reverberant, i.e. good sound reflecting Materials come into question.
  • the ⁇ / 4 resonators formed from a sheet or plastic film.
  • the resonators in groups can do this Tile-like attached to the vehicle and aligned in this way that there is any contamination by water or cannot catch oil, i.e. flow out again directly can.
  • the assembly of these according to the invention Sound absorbers can be made using known means.
  • the reverberant absorbers becomes vibrations and vibration-prone vehicle parts stiffened and steamed.
  • the cavities are direct into a reverberant matrix, preferably into a lightweight one Plastic, metal or ceramic matrix molded.
  • the advantages of the device according to the invention are Expert immediately apparent and are particularly in the creation of a specifically tunable and lightweight Absorbers with a low overall height.
  • use this absorber in heavily polluting environments is not sensitive to moisture and can be manufacture inexpensively.
  • this sound absorber together with the vehicle chassis be immersed in a dye bath without soiling it and without being damaged.
  • Figure 2 shows a simple embodiment of the inventive Sound absorber under supervision.
  • a group of Resonators 10 are designed as straight hollow bodies that either front 13 or bottom 15 a sound opening exhibit.
  • the honeycomb base 12 allows a comprehensive coating.
  • the individual resonators 10 a length of 43 mm to 84 mm, i.e. are on frequencies tuned between 1 and 2 kHz.
  • This ⁇ / 4 absorber can be made of hard and smooth plastic, for example manufacture or form from sheet metal foils.
  • Figure 3a shows a box-shaped embodiment an extruded plastic molding 16.
  • the cross section of the individual resonators 10 is approximately rectangular here.
  • the sound-effective orifices 17 are on the jacket side appropriate.
  • the end walls 18 of the resonators 10 shifted in the desired manner become. This allows a targeted optimization of the acoustic Absorption effectiveness. It goes without saying that too these ⁇ / 4 absorbers can be arranged in several layers can.
  • FIG. 3b an embodiment is shown at which essentially consists of two molded parts 7, 9 are constructed.
  • a first molded part 7 is preferably made of aluminum and points in parallel mutually extending ribs 8.
  • This molding 7 can directly from aluminum foam or from an aluminum sheet be shaped.
  • the ribs 8 of this molded part 7 are with a second molded part 9, in particular a film or a sheet, preferably made of aluminum, covered and together form the hollow body 6 according to the invention Openings 5 can be punched out of the second molded part 9 his. Easily after merging the two molded parts 7, 9 partial areas of the second molded part 9 pressed into the hollow body 6 such that resonator openings 5 arise and at the same time, between each Resonators 6 end walls 4 are formed.
  • the end walls 4 can also be molded directly into the first molded part 7 his. Such an embodiment can be adapt easily to the desired contours and is therefore inexpensive. It is understood that through that Molding of ribs and end walls in the first molded part 7, this maintains a high degree of mechanical rigidity and the desired one even with relatively thin material acoustic sound hardness can be achieved.
  • FIG. 4a shows a further modular embodiment of the ⁇ / 4 absorber according to the invention.
  • This consists of block-like Components 25 in which the tubular Resonators 27 are. These can be drilled out later or with an appropriate injection molding process directly be shaped.
  • the Cavities of the resonators 27 parallel to the block geometry and these blocks 25 become like tiles during assembly placed on top of each other and fixed. It is understood that the optimal dimensioning of the tubular resonators 23 lies in the area of professional skill. As well can be used for the production of these ⁇ / 4 absorber blocks reverberant materials are used.
  • the resonators 27 run obliquely to the block geometry.
  • the angular position of the individual can of course Resonators are different from each other.
  • FIG. 5 shows a schematic illustration of the distribution of the resonators of different lengths.
  • the sound openings 21, 22, 23, 24 of the individual resonators each lie on the node of a network which is essentially spanned by isosceles triangles. It is clear from FIG. 5 that, in this configuration, the interaction zone A w of the ⁇ / 4 absorbers applied for a specific wavelength does not substantially overlap and an area-wide arrangement of the wavelength-dependent interaction zones A w is achieved.
  • Resonator groups in this length range and with a cross-sectional area of 0.25 to 2 cm 2 can be produced inexpensively by deforming a plastic or metal foil in such a way that semi-tubular depressions are formed and this shaped foil is mounted or mounted against a carrier layer or carrier plate. is stuck on.
  • Such shaped resonators are also sound-hard when using thin foils because of the inherent rigidity of curved surfaces and have a high quality factor as resonators.
  • the absorbers according to the invention are, their conception accordingly, primarily suitable for applications in which the disturbing and absorbable noise in one limited frequency range occurs. Generate in particular Gear or timing belt, which at constant Speed running, fan blower, electric motors or propeller motors in aircraft, Noise sources with a precisely defined narrow frequency range.
  • An analogous use of the inventive Absorber is also used for sound absorbing linings conceivable from traffic tunnels. It is understood that the Use of the absorber according to the invention not on the Vehicle area should be restricted. That's how it is Can also be used in swimming pools, sports halls or factories conceivable as wall or ceiling cladding.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
  • Body Structure For Vehicles (AREA)

Claims (10)

  1. Amortisseur de bruit constitué par plusieurs résonateurs (10) en forme de petits tubes, possédant au moins une ouverture (13) de passage du son, et une surface de réflexion acoustique (A), les ouvertures (13) de passage du son jouxtant la surface de réflexion acoustique (A), caractérisé en ce que pour la formation de zones, dans lesquelles une interférence destructrice peut se produire entre une onde réfléchie sur la surface de réflexion acoustique (A) et une onde déphasée dans le résonateur en forme de petit tube (10), les ouvertures respectives (13) de passage du son sont séparées l'une de l'autre par au moins le rayon de la zone d'interaction (Aw) qui y est associée, c'est-à-dire ne chevauchent pas de façon conséquente les zones d'interaction (Aw), et que ces zones d'interaction (Aw) sont réparties autant que possible avec recouvrement au-dessus de la surface de réflexion acoustique (A).
  2. Amortisseur de bruit selon la revendication 1, caractérisé en ce que les résonateurs en forme de petits tubes (10) possèdent des longueurs différentes.
  3. Amortisseur de bruit selon la revendication 1 ou 2, caractérisé en ce que les ouvertures acoustiques sont disposées sur le côté frontal des résonateurs en forme de petits tubes.
  4. Amortisseur de bruit selon la revendication 1 ou 2, caractérisé en ce que les ouvertures de passage du son sont formées dans l'enveloppe des résonateurs en forme de petits tubes.
  5. Amortisseur de bruit selon les revendications 1 à 4, caractérisé en ce que les ouvertures pour le passage du son ont des tailles différentes.
  6. Amortisseur de bruit selon l'une des revendications 1 à 5, caractérisé en ce que les résonateurs (10) sont ouverts vers le bas à l'état monté.
  7. Amortisseur de bruit selon l'une des revendications 1 à 6, caractérisé en ce que les résonateurs sont disposés parallèlement à la surface (A).
  8. Amortisseur de bruit selon l'une des revendications 1 à 7, caractérisé en ce que les résonateurs sont formés dans une matrice réverbérante (16, 25) ou dans des pièces moulées réverbérantes (7, 9).
  9. Amortisseur de bruit selon la revendication 8, caractérisé en ce que la matrice réverbérante ou chacune des pièces moulées est réalisée en matière plastique ou en un métal léger.
  10. Amortisseur de bruit selon l'une des revendications 1 à 9, caractérisé en ce qu'au moins le côté intérieur des résonateurs en forme de petits tubes (10) possède une surface lisse.
EP96900025A 1995-01-27 1996-01-04 AMORTISSEUR DE BRUIT l/4 Expired - Lifetime EP0806030B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CH00226/95A CH690143A5 (de) 1995-01-27 1995-01-27 Lambda/4-Schallabsorber.
CH22695 1995-01-27
CH226/95 1995-01-27
PCT/CH1996/000002 WO1996023294A1 (fr) 1995-01-27 1996-01-04 AMORTISSEUR DE BRUIT μ/4

Publications (2)

Publication Number Publication Date
EP0806030A1 EP0806030A1 (fr) 1997-11-12
EP0806030B1 true EP0806030B1 (fr) 2000-08-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96900025A Expired - Lifetime EP0806030B1 (fr) 1995-01-27 1996-01-04 AMORTISSEUR DE BRUIT l/4

Country Status (11)

Country Link
US (1) US5959265A (fr)
EP (1) EP0806030B1 (fr)
JP (1) JP3778935B2 (fr)
CN (1) CN1173937A (fr)
AR (1) AR000728A1 (fr)
BR (1) BR9606802A (fr)
CH (1) CH690143A5 (fr)
DE (1) DE59605821D1 (fr)
ES (1) ES2150092T3 (fr)
PT (1) PT806030E (fr)
WO (1) WO1996023294A1 (fr)

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Also Published As

Publication number Publication date
EP0806030A1 (fr) 1997-11-12
CH690143A5 (de) 2000-05-15
JP3778935B2 (ja) 2006-05-24
CN1173937A (zh) 1998-02-18
PT806030E (pt) 2001-01-31
AR000728A1 (es) 1997-08-06
DE59605821D1 (de) 2000-10-05
US5959265A (en) 1999-09-28
JPH10512687A (ja) 1998-12-02
ES2150092T3 (es) 2000-11-16
BR9606802A (pt) 1997-12-30
WO1996023294A1 (fr) 1996-08-01

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