EP2631449B1 - Absorbeur acoustique - Google Patents

Absorbeur acoustique Download PDF

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Publication number
EP2631449B1
EP2631449B1 EP12001189.5A EP12001189A EP2631449B1 EP 2631449 B1 EP2631449 B1 EP 2631449B1 EP 12001189 A EP12001189 A EP 12001189A EP 2631449 B1 EP2631449 B1 EP 2631449B1
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EP
European Patent Office
Prior art keywords
perforation
film
absorption device
foil
acoustic absorption
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.)
Active
Application number
EP12001189.5A
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German (de)
English (en)
Other versions
EP2631449A1 (fr
Inventor
Matthias Kroll
Gero Seydler
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.)
Isolite GmbH
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Isolite GmbH
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Publication date
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Priority to EP12001189.5A priority Critical patent/EP2631449B1/fr
Publication of EP2631449A1 publication Critical patent/EP2631449A1/fr
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Publication of EP2631449B1 publication Critical patent/EP2631449B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/11—Thermal or acoustic insulation
    • F02B77/13—Acoustic insulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
    • F02M35/1205—Flow throttling or guiding
    • F02M35/1216—Flow throttling or guiding by using a plurality of holes, slits, protrusions, perforations, ribs or the like; Surface structures; Turbulence generators

Definitions

  • the invention relates to a sound absorber, in particular for internal combustion engines, according to claim 1 and to a corresponding method according to claim 10.
  • Turbochargers also called exhaust gas turbochargers, ATL for short, serve to increase the performance of internal combustion engines by increasing the fuel mixture throughput per work cycle of the internal combustion engine.
  • internal combustion engines such as turbochargers
  • the sound generated in vehicles, such as cars can impair the environment and or the occupants of the vehicle, or at least be perceived as unpleasant, so that driving comfort can be impaired or, in the case of prolonged exposure to noise, for example during long journeys, even an additional burden on the occupants can arise.
  • Sound absorbers with at least one perforated metal foil and / or an insulating body are made DE19818873 , WO2004045843 , WO03021096 , WO0046493 , WO2008141380 or WO2008028637 known.
  • the invention provides a sound absorber for absorbing sound, in particular for an internal combustion engine, comprising: a perforated foil, made of metal, with a perforation with a hole percentage of 3-5%.
  • Perforation here means the perforation of the film. In the process, any burrs are typically removed, so that there are typically no artifacts caused by the perforation, which may only be formed on one side of the surface.
  • a suitable choice of perforation creates a perforated portion of the film that is particularly efficient at sound can absorb by means of the film. Perforations of 3-5% can be particularly efficient. In this case, the ratio of a selected, perforated area or a perforated area of the film to a correspondingly selected, non-perforated area should be considered as the perforation proportion. If the perforation is subject to a periodicity or lattice-like structure, you should compare in units of one period. The areas under consideration should be contiguous and not concave.
  • a rectangle or square or diamond / parallelogram can be used that corresponds to the structure of the perforation.
  • the perforated area of a film should be considered explicitly.
  • the unperforated edge area should generally not be considered.
  • the foil used is made of metal, for example thin metal foils with a thickness of 0.5 ⁇ m up to 200 ⁇ m can be used. However, other values are also possible. It is also possible, not the subject of the invention, to use heat-resistant plastics.
  • the film can have holes in the perforation with a hole diameter between 0.5 mm and 1 mm.
  • the hole diameter is one of the parameters that can control the hole percentage.
  • the hole diameter between 0.5 mm and 1 mm is efficient with regard to sound absorption and permeability of a film.
  • the hole spacing can also be considered, with measurements generally being made from the center of the hole to the center of the hole.
  • the hole diameter of the perforation can be essentially constant in the sound diameter.
  • the perforation hole diameters will be constant, i.e. all holes in the film have essentially the same diameter. It goes without saying that it may be possible to have several hole diameters. Typically, however, the number will be limited to a few hole diameters. In terms of production, it is the least complex to provide only one hole diameter.
  • the perforation in the sound absorber can be grid-like, in particular regularly grid-shaped.
  • the perforation is grid-like or even regularly grid-like. This means that the perforation can have a simple rectangular or even square structure, with each of the four corners being perforated.
  • the film can be composed of several partial films, wherein the partial films can be welded or folded together.
  • a sound absorber or sound absorbing structure can be assembled from several partial foils to form a surface or a body in the room.
  • the partial films which form this body or this structure can be suitably put together, for example by folding or welding.
  • Each of the partial films can have a different proportion of holes.
  • the partial films each have a different proportion of holes. It is possible that some of these partial films are not perforated.
  • the sound absorber further comprises a nonwoven, the nonwoven comprising a fiber fabric, the fiber fabric comprising mineral fibers, such as silicate fibers and / or glass fibers and / or ceramic fibers, which are twisted.
  • a nonwoven comprising a fiber fabric, the fiber fabric comprising mineral fibers, such as silicate fibers and / or glass fibers and / or ceramic fibers, which are twisted.
  • the fleece is typically applied in the sound absorber nearby, for a film typically on one side of the film.
  • the fleece can absorb sound that passes through the holes in the film. It is also possible that the fleece that surrounds the film in at least some areas.
  • the perforated film additionally has, at least in part, an embossing with an embossed pattern, so that a relief-like structure is formed on the surface of the film.
  • embossing should be understood in addition to the perforation.
  • Other names for embossing can be calotting or embossing.
  • a relief-like structure is created on the surface of the film, which in addition to perforation on the film, i.e. can absorb sound on the surface of the film.
  • the relief-like "mountain and valley" structure can be suitably adapted to the frequency ranges of the sound to be absorbed during manufacture.
  • the embossing pattern has an embossing depth in the range of 0.2 - 2 mm.
  • the embossing depth can be essentially constant.
  • the embossed pattern can be lattice-like, in particular regularly lattice-like.
  • the embossing depth can be different or it can be constant or even grid-like or regularly grid-like.
  • the embossing pattern can be independent of the perforation. Similar to the perforation of the holes, distances are typically measured from the center, i.e. the highest point of one structure to the corresponding center of another structure. The embossing pattern can match the perforation.
  • the structure and / or periodicity of the embossed pattern can match the perforation of the film. However, both can still be independent of each other. It is also possible that the two match and lie on top of each other, i.e. where there is a hole in the film, particularly in a regular perforation, there is also an embossed structure, for example a mountain-like tip of the embossing.
  • the embossing can be variable or only in parts of the film. If a clear sound source with a sound direction can be determined, the embossing can also be varied depending on the distance of the sound absorber from the sound source in relation to the sound direction.
  • the invention further provides a method for producing a sound absorber for absorbing sound for an internal combustion engine, with the steps of claim 10.
  • Suitable tools such as needles variable in length, can be used to punch the film after an embossing pattern has already been embossed.
  • the embossing can be carried out before punching, i.e.
  • the film is perforated, which is advantageous from a manufacturing point of view.
  • the direction of perforation for punching the film, i.e. from which side the film is perforated is not decisive.
  • Another aspect of the invention relates to the use of a sound absorber as described above for sound absorption of sound from a turbocharger in an engine compartment of a vehicle.
  • Another aspect of the invention relates to a vehicle with an engine compartment, which comprises an engine, in particular an internal combustion engine with a turbocharger, and a sound absorber as described above.
  • the Fig. 1A shows a schematic drawing of a perforated film 1.
  • the in Figure 1 has a uniform, lattice-like structure with a hole spacing b.
  • the hole spacing is measured from the center / center of the hole to the center of the hole.
  • Figure 1A only a distance b in one direction, typically horizontal here, should be understood that the distance predefined perpendicular to it should also have the value b.
  • the hole diameter of the round holes 3 of the Figure 1A is marked with d.
  • Figure 1A also shows a side section of the film 1 of the Figure 1A .
  • the thickness of the film is denoted by t.
  • the thickness of the film can range from 0.5 ⁇ m to 200 ⁇ m with regard to the following Figure 2-4 be chosen.
  • the film with the reference number 11 comprises a uniform, lattice-like structure of the holes 3 in the film 11.
  • the thickness of the film is 0.1 mm purely by way of example.
  • the hole diameter of the film is 1 mm.
  • the hole spacing b of the holes in the film 11 is 4.6 mm.
  • the proportion of holes in the holes 3 in the film 11 is 4%.
  • the film with the reference number 13 in turn comprises a uniform, lattice-like structure of the holes 3 in the film 13.
  • the thickness of the film is 0.1 mm purely by way of example.
  • the hole diameter is 0.75 mm.
  • the hole spacing b of the holes in the film 13 is 3.8 mm for this example.
  • the percentage of holes is 3%.
  • the film with the reference number 15 in turn comprises a uniform, lattice-like structure of the holes 3 in the film 15.
  • the thickness of the film is 0.1 mm purely by way of example.
  • the hole diameter of the film is 0.5 mm.
  • the hole spacing b of the holes in the film 11 is 2.5 mm for this example.
  • the proportion of holes in the holes 3 in the film 15 is 3%. Measurements and simulation calculations have shown that the film 15 absorbs both vertically incident sound and diffusely incident sound significantly better than a standard film with a hole percentage of 0.04% or even 0.01%. Vertical sound is measured / simulated using a Kundt tube. Diffuse incident sound is measured / simulated by the sound falling on the film of the sound absorber without a preferred direction.
  • the Figure 2 shows a schematic diagram of a unit cell of a film that the in Figure 1B shown films 11, 13, and 15 may correspond. Shown is a uniform, lattice-like hole structure with holes 3, the centers of which lie on the corners of a square with the edge length, that is to say the hole spacing b. As a result, a portion 3V of the hole 3 falls on the unit cell for each hole, so that the hole proportion can be calculated. If the area of the portion 3V is designated as F 3V , the hole portion results in Figure 2 as 4 x F 3V / b 2 x 100 [%].
  • this concept can be extended to perforations with different hole spacings, for example a hole spacing b in one direction and a different hole spacing b 'in a direction perpendicular thereto.
  • the proportion of holes can either be specified in a direction-dependent manner or averaged over a correspondingly large, perforated area.
  • FIG 3 is a simple structure for using a sound absorber according to the present invention outlined.
  • a sound source 50 is shown which emits sound 52.
  • the sound source can be, for example, an engine, for example an internal combustion engine.
  • the internal combustion engine can include an exhaust gas turbocharger.
  • the sound absorber 100 is in the Figure 3 sketched at a distance D from the sound source 50.
  • the sound absorber 100 of the Figure 3 comprises a film 101 which corresponds to the films as in Figure 1B outlined, can correspond.
  • the film 101 has holes 3.
  • the holes can, as in Figure 1B outlined, have a regular perforation.
  • the sound absorber 100 of the Figure 3 may further comprise an insulating body 103.
  • This can be a non-woven or non-woven fabric. This can be attached, for example, on one side of the film 101, preferably immediately behind it or at a short distance of a few millimeters.
  • the fleece can comprise fiber fabrics, such as mineral fibers, such as silicate fibers and / or glass fibers and / or ceramic fibers, which are preferably twisted.
  • the fiber fabric can also be glued.
  • the nonwoven can also be provided with a binder and pressed into a shape corresponding to the sound absorber 100 by heat.
  • a fleece 103 as in Figure 3 is shown with the foils as in Figure 1B shown combinable.
  • the Figure 4 shows a film 21 which the films, as in the Figures 1B - 3 discussed, can correspond.
  • the film 21 is in turn perforated with holes 3. Similar to the films 11, 13, and 15 of the Figure 1B the perforation of the film is again uniform and grid-like, i.e. square here.
  • the film 21 comprises an embossing, also referred to as calotting or embossing.
  • embossing ie the maxima or "mountain peaks" of the embossing, are identified by reference numeral 23.
  • the distance between the maxima is again uniform and grid-like.
  • a determination of the proportion of the maxima per standard area or unit cell can be carried out analogously to the determination of the proportion of holes, as with the aid of Figure 2 discussed.
  • the structure of the perforation and the embossing are essentially the same in this example.
  • the Figure 4B shows a side view of the film 21, which is already in Figure 4A was shown.
  • the sketched sound absorber can be used in a vehicle to suitably absorb sound generated in the engine compartment, for example from the engine or from a turbocharger.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Exhaust Silencers (AREA)
  • Building Environments (AREA)

Claims (11)

  1. Absorbeur acoustique (100) pour absorption acoustique, en particulier pour une porte de combustion, comprenant:
    un film de métal perforé (1, 11, 13, 15, 21, 101) avec une perforation ayant une proportion de trous de 3 à 5 %; et caractérisé par
    un tissu non tissé (103), ledit tissu non tissé (103) comprenant un voile fibreux, ledit voile fibreux comprenant des fibres minérales, telles que des fibres de silicate et/ou des fibres de verre et/ou des fibres céramiques, qui sont torsadées;
    dans laquelle le film perforé (1, 11, 13, 15, 21, 101) présente en outre au moins partiellement un motif en relief (23), de sorte qu'une structure en relief est formée sur la surface du film (1, 11, 13, 15, 21, 101);
    dans lequel le motif de gaufrage a une profondeur de gaufrage comprise entre 0,2 et 2 mm.
  2. Absorbeur acoustique (100) selon la revendication 1, dans lequel le film (1, 11, 13, 15, 21, 101) présente des perforations d'un diamètre de trou compris entre 0,5 mm et 1 mm.
  3. Absorbeur acoustique (100) selon au moins l'une des revendications 1 et 2, dans lequel le diamètre Lc de la perforation est sensiblement constant.
  4. Absorbeur acoustique (100) selon au moins l'une des revendications 1 à 3, dans lequel la perforation est en forme de grille, en particulier régulièrement en forme de grille.
  5. Absorbeur acoustique (100) selon au moins une des revendications 1 à 4, le film (1, 13, 15, 21, 101) étant composé d'une pluralité de films partiels, les films partiels étant soudés ou pliés ensemble.
  6. Absorbeur acoustique (100) selon la revendication 5, dans lequel chacun des films partiels présente une proportion différente de trous.
  7. Absorbeur acoustique (100) selon la revendication 1, dans lequel la profondeur de gaufrage est sensiblement constante.
  8. Absorbeur acoustique (100) selon l'une des revendications 1 ou 7, dans lequel le motif de gaufrage est en forme de grille, en particulier en forme de grille régulière.
  9. Absorbeur acoustique (100) selon l'une des revendications 1, 7 ou 8, dans lequel le motif de gaufrage correspond à la perforation.
  10. Procédé de fabrication d'un absorbeur acoustique (100) pour absorption acoustique pour un moteur à combustion interne, comprenant les étapes suivantes:
    fourniture d'un film (1, 11, 13, 15, 21, 101), de préférence en métal;
    estampage d'au moins une partie du film (1, 11, 13, 15, 21, 101), ce qui permet d'estamper un motif de gaufrage de manière à former une structure en relief sur la surface du film (1, 11, 13, 15, 21, 101), le motif de gaufrage ayant une profondeur d'estampage comprise entre 0,2 et 2 mm;
    perforation du film (1, 11, 13, 15, 21, 101) de sorte que le film perforé (1, 11, 13, 15, 21, 101) présente une proportion de trous de 3 à 5 % ;
    fourniture d'un tissu non tissé (103), ledit tissu non tissé (103) comprenant un voile fibreux, ledit voile fibreux comprenant des fibres minérales telles que des fibres de silicate et/ou des fibres de verre et/ou des fibres céramiques qui sont torsadées.
  11. Véhicule avec un compartiment moteur comprenant un moteur, en particulier un moteur à combustion interne avec un turbocompresseur, et un absorbeur acoustique (100) selon au moins une des revendications 1 à 9.
EP12001189.5A 2012-02-22 2012-02-22 Absorbeur acoustique Active EP2631449B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12001189.5A EP2631449B1 (fr) 2012-02-22 2012-02-22 Absorbeur acoustique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12001189.5A EP2631449B1 (fr) 2012-02-22 2012-02-22 Absorbeur acoustique

Publications (2)

Publication Number Publication Date
EP2631449A1 EP2631449A1 (fr) 2013-08-28
EP2631449B1 true EP2631449B1 (fr) 2020-07-29

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008028637A1 (fr) * 2006-09-06 2008-03-13 Daimler Ag Système d'échappement d'un véhicule automobile

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19818873C2 (de) * 1998-04-28 2001-07-05 Man B & W Diesel Ag Hubkolbenbrennkraftmaschine
WO2000046493A1 (fr) * 1999-02-02 2000-08-10 Rieter Automotive (International) Ag Procede de fabrication d'un element d'isolation phonique et element d'isolation fabrique suivant ce procede
WO2003021096A1 (fr) * 2001-09-04 2003-03-13 Hp-Chemie Pelzer Research And Development Ltd. Revetement isolant thermique et acoustique applique sur le compartiment moteur de vehicules motorises
DE10253832A1 (de) * 2002-11-18 2004-05-27 Carcoustics Tech Center Gmbh Schallisolierender Hitzeschutzschild
WO2008141380A1 (fr) * 2007-05-21 2008-11-27 Bellmax Acoustic Pty Ltd Matériau en feuille destiné à être utilisé dans un écran acoustique multicouche

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008028637A1 (fr) * 2006-09-06 2008-03-13 Daimler Ag Système d'échappement d'un véhicule automobile

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Publication number Publication date
EP2631449A1 (fr) 2013-08-28

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