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EP0445431A2 - Resonator screen for a sound damping screen - Google Patents

Resonator screen for a sound damping screen Download PDF

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Publication number
EP0445431A2
EP0445431A2 EP90125461A EP90125461A EP0445431A2 EP 0445431 A2 EP0445431 A2 EP 0445431A2 EP 90125461 A EP90125461 A EP 90125461A EP 90125461 A EP90125461 A EP 90125461A EP 0445431 A2 EP0445431 A2 EP 0445431A2
Authority
EP
European Patent Office
Prior art keywords
resonator
cover
filling
backdrop
bulges
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.)
Withdrawn
Application number
EP90125461A
Other languages
German (de)
French (fr)
Other versions
EP0445431A3 (en
Inventor
Gerd De Lank
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.)
Gruenzweig und Hartmann Montage GmbH
G&H Montage GmbH
Original Assignee
Gruenzweig und Hartmann Montage GmbH
G&H Montage GmbH
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 Gruenzweig und Hartmann Montage GmbH, G&H Montage GmbH filed Critical Gruenzweig und Hartmann Montage GmbH
Publication of EP0445431A2 publication Critical patent/EP0445431A2/en
Publication of EP0445431A3 publication Critical patent/EP0445431A3/en
Withdrawn legal-status Critical Current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 resonator backdrop for backdrop silencers, with a support housing or frame in which a filling made of an absorber material is arranged, and at least one surface facing a flow channel is provided with a perforated cover which is spaced apart by spacing elements from the filling made of absorber material is held.
  • Such scenes for backdrop silencers based on hole resonators or Helmholz resonators are known.
  • a system capable of oscillation is formed by the scenes, in which the air present in the vicinity of the perforations acts as a mass and the air layer in the resonator cavity acts as a spring.
  • the resonance i.e. H. at the greatest speed of the air particles moving through the holes, sound energy is extracted from the space in front of the resonator backdrop.
  • the solution to this problem according to the invention is characterized in that the spacer elements are formed by bulges of the cover protruding in the direction of the filling.
  • the bulges are formed by depressions made in the cover, in particular by deep drawing.
  • the reference numeral 1 denotes a carrier box of a resonator backdrop, in which a substantially plate-shaped filling 5 made of an absorber material, such as. B. mineral wool, cotton wool or plastic fibers is arranged.
  • the carrier box which preferably consists of a metal or plastic, is provided with a cover 2, in which round holes 3 are provided in the present exemplary embodiment arranged in a square grid. A random arrangement of the holes is also possible.
  • cover 2 With 4 in each case between the rows of holes in the present embodiment, parallel to each other in one direction, introduced in the cover 2 beads. The beads form bulges in the cover, which protrude in the direction of the filling 5 and come into contact with the filling at the points labeled 6.
  • the cover 2 consists of sheet steel, and the beads 4 are introduced into the steel sheet by deep drawing.
  • a grid of beads, preferably perpendicularly, crossing beads could also be provided and the holes 3 could have different hole shapes than in the exemplary embodiment shown.
  • the arrangement of the holes differ from that of the exemplary embodiment shown in FIG. 1 for a resonator backdrop.
  • the holes it is not absolutely necessary, as in the exemplary embodiment according to FIGS. 1 and 2, for the holes to be arranged at grid spacings which are the same size in mutually perpendicular directions.
  • the sum of the cross-sectional areas of the holes 3 is 3% of the total surface of the cover 2. This proportion can range from 0.1% to 3% of the total surface.
  • the depth of the depressions is adapted to the size of the holes and the intended degree of damping of the resonators.
  • the box 1 shown in FIGS. 1 and 2 could also be designed as a frame and a cover corresponding to the cover 2 could be provided on the side of the frame opposite the cover 2.
  • the backdrops are arranged in such a way that a gas flow, the noise of which is to be damped, flows past the covers provided with the holes.
  • a cover is provided, in which triangular recesses 14 are provided in cross section, which can be produced advantageously and with little effort by folding a sheet metal sheet forming the cover.
  • punctiform depressions 104a are introduced by the spacer elements, which put the filling 105 on to prevent the cover 102 are formed. These depressions can, if appropriate also together with beads, be embossed in one step into a sheet metal sheet forming the cover 102 using the deep-drawing process.
  • the bulges can in particular be designed so that they form a closed cavity of predetermined dimensions and volume around an opening between the cover and the filling.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Exhaust Silencers (AREA)

Abstract

The invention relates to a resonator screen for a sound damping screen, having a housing or frame in which an essentially plate-shaped filling made from an absorption material is provided, the housing or the frame having on at least one side a cover having holes which is held by spacer elements at a distance from the filling made from an absorber material. The invention provides an improved resonator screen, particularly with reference to the expenditure required in its production, which is characterised in that the spacer elements are formed by projections of the cover which project in the direction of the filling. <IMAGE>

Description

Die Erfindung betrifft eine Resonatorkulisse für Kulissenschalldämpfer, mit einem Trägergehäuse oder -rahmen, in dem eine Füllung aus einem Absorbermaterial angeordnet ist, und wenigstens eine einem Strömungskanal zugewandte Fläche mit einer Lochungen aufweisenden Abdeckung versehen ist, die durch Distanzelemente zu der Füllung aus Absorbermaterial im Abstand gehalten ist.The invention relates to a resonator backdrop for backdrop silencers, with a support housing or frame in which a filling made of an absorber material is arranged, and at least one surface facing a flow channel is provided with a perforated cover which is spaced apart by spacing elements from the filling made of absorber material is held.

Derartige Kulissen für Kulissenschalldämpfer auf der Basis von Lochresonatoren bzw. Helmholzresonatoren sind bekannt. Durch die Kulissen wird ein schwingungsfähiges System gebildet, in dem die unmittelbar in der Umgebung der Lochungen vorhandene Luft als Masse und die in dem Resonatorhohlraum vorhandene Luftschicht als Feder wirkt. Bei der Resonanz, d. h. bei der größten Geschwindigkeit der sich durch die Löcher bewegenden Luftteilchen, wird dem Raum vor der Resonatorkulisse Schallenergie entzogen.Such scenes for backdrop silencers based on hole resonators or Helmholz resonators are known. A system capable of oscillation is formed by the scenes, in which the air present in the vicinity of the perforations acts as a mass and the air layer in the resonator cavity acts as a spring. At the resonance, i.e. H. at the greatest speed of the air particles moving through the holes, sound energy is extracted from the space in front of the resonator backdrop.

Bei diesen bekannten Resonatorkulissen werden zwischen der Abdeckung und der Füllung aus einem Absorbermaterial weitmaschige Gitter aus Stahl- oder Kunststoffdrähten als Distanzelemente angeordnet. Durch diese Gitter soll verhindert werden, daß die Füllung aus Absorbermaterial durch die Sogwirkung von an der gelochten Abdeckung vorbeistreichender Luft unmittelbar an dem Löchern der gelochten Abdeckung anliegt, wodurch der Resonator stark bedämpft und die Absorptionswirkung erheblich abnehmen würde. Das Einlegen von Gittern aus Stahl- oder Kunststoffdrähten zwischen der Abdeckung und der Füllung erfordert einen hohen Material- und Arbeitsaufwand, der sich in entsprechend hohen Herstellungskosten dieser bekannten Resonatorkulissen niederschlägt.In these known resonator backdrops, wide-meshed grids made of steel or plastic wires are arranged as spacer elements between the cover and the filling made of an absorber material. These gratings are intended to prevent the filling made of absorber material from being in direct contact with the holes in the perforated cover due to the suction effect of air flowing past the perforated cover, as a result of which the resonator is strongly damped and the absorption effect would decrease considerably. The insertion of grids made of steel or plastic wires between the cover and the filling requires a lot of material and work, which is reflected in the correspondingly high manufacturing costs of these known resonator backdrops.

Es ist die Aufgabe der vorliegenden Erfindung, eine Resonatorkulisse der eingangs erwähnten Art zu schaffen, die gegenüber den bekannten derartigen Resonatorkulissen verbessert ist.It is the object of the present invention to create a resonator backdrop of the type mentioned at the outset, which is improved over the known resonator backdrops of this type.

Die erfindungsgemäße Lösung dieser Aufgabe ist dadurch gekennzeichnet, daß die Distanzelemente durch in Richtung auf die Füllung vorstehende Ausbuchtungen der Abdeckung gebildet sind.The solution to this problem according to the invention is characterized in that the spacer elements are formed by bulges of the cover protruding in the direction of the filling.

Durch diese erfindungsgemäße Lösung, bei der die Ausbuchtungen verhindern, daß sich die Füllung durch Sogwirkung von an der Abdeckung vorbeistreichender Luft in Richtung auf die Abdeckung bewegen, und insbesondere die Lochungen abdecken kann, wird eine wesentliche konstruktive Vereinfachung der Resonatorkulisse und damit eine erhebliche Kostenreduzierung bei der Herstellung erreicht.This solution according to the invention, in which the bulges prevent the filling from moving in the direction of the cover by suction of air flowing past the cover, and in particular can cover the perforations, significantly simplifies the construction of the resonator and thus significantly reduces costs of production achieved.

In vorteilhafter Ausgestaltung der Erfindung kann vorgesehen sein, daß die Ausbuchtungen durch in die Abdeckung, insbesondere durch Tiefziehen, eingebrachte Vertiefungen gebildet sind.In an advantageous embodiment of the invention it can be provided that the bulges are formed by depressions made in the cover, in particular by deep drawing.

Weitere vorteilhafte Ausgestaltungsmöglichkeiten gehen aus den Unteransprüchen hervor.Further advantageous design options emerge from the subclaims.

Die Erfindung soll nun anhand von Ausführungsbeispielen und der sich auf diese Beispiele beziehenden Zeichnungen weiter erläutert und beschrieben werden. Es zeigen:

Fig.1
ein Ausführungsbeispiel für eine erfindungsgemäße Resonatorkulisse in einer Vorderansicht,
Fig.2
die erfindungsgemäße Resonatorkulisse von Fig. 1 in einer vergrößerten seitlichen Schnittdarstellung gemäß der Schnittlinie A - A von Fig. 1,
Fig.3
ein weiteres Ausführungsbeispiel für eine erfindungsgemäße Resonatorkulisse in einer seitlichen, zu der Schnittdarstellung gemäß der Fig. 2 analogen Darstellung, und
Fig.4
ein weiteres Ausführungsbeispiel für eine erfindungsgemäße Resonatorkulisse in einer Vorderansicht.
The invention will now be further explained and described on the basis of exemplary embodiments and the drawings relating to these examples. Show it:
Fig. 1
an embodiment of a resonator backdrop according to the invention in a front view,
Fig. 2
the resonator backdrop of FIG. 1 in an enlarged lateral sectional view along the section line A - A of Fig. 1,
Fig. 3
a further embodiment of a resonator backdrop according to the invention in a side view, analogous to the sectional view according to FIG. 2, and
Fig. 4
a further embodiment of a resonator backdrop according to the invention in a front view.

In den Fig. 1 und 2 ist mit dem Bezugszeichen 1 ein Trägerkasten einer Resonatorkulisse bezeichnet, in dem eine im wesentlichen plattenförmige Füllung 5 aus einem Absorbermaterial, wie z. B. Mineralwolle, Watte oder Kunststoffasern, angeordnet ist. Der Trägerkasten, der vorzugsweise aus einem Metall oder Kunststoff besteht, ist mit einer Abdeckung 2 versehen, in der im vorliegenden Ausführungsbeispiel in einem quadratischen Raster angeordnet runde Löcher 3 vorgesehen sind. Eine zufällige Anordnung der Löcher ist jedoch auch möglich. Mit 4 sind jeweils zwischen den Lochreihen im vorliegenden Ausführungsbeispiel parallel zueinander in einer Richtung verlaufende, in die Abdeckung 2 eingebrachte Sicken bezeichnet. Durch die Sicken werden in der Abdeckung Ausbuchtungen gebildet, die in Richtung auf die Füllung 5 vorstehen und an den mit 6 bezeichneten Stellen gegen die Füllung zur Anlage kommen. Die Abdeckung 2 besteht im vorliegenden Ausführungsbeispiel aus Stahlblech, und die Sicken 4 sind durch Tiefziehen in das Stahlblech eingebracht. Anstelle der parallel in eine Richtung zueinander verlaufend vorgesehenen Sicken könnte auch ein Gitter von sich, vorzugsweise senkrecht, kreuzenden Sicken vorgesehen sein und die Löcher 3 könnten andere Lochformen als im gezeigten Ausführungsbeispiel aufweisen. Auch könnte die Anordnung der Löcher sich von der des in der Fig. 1 gezeigten Ausführungsbeispiels für eine Resonatorkulisse unterscheiden. Zur Gewährleistung der Funktion der Resonatorkulise ist es nicht unbedingt erforderlich, daß, wie bei dem Ausführungsbeispiel gemäß der Fig. 1 und 2, die Löcher in Rasterabständen, die in zueinander senkrechten Richtungen gleich groß sind, angeordnet werden.1 and 2, the reference numeral 1 denotes a carrier box of a resonator backdrop, in which a substantially plate-shaped filling 5 made of an absorber material, such as. B. mineral wool, cotton wool or plastic fibers is arranged. The carrier box, which preferably consists of a metal or plastic, is provided with a cover 2, in which round holes 3 are provided in the present exemplary embodiment arranged in a square grid. A random arrangement of the holes is also possible. With 4 in each case between the rows of holes in the present embodiment, parallel to each other in one direction, introduced in the cover 2 beads. The beads form bulges in the cover, which protrude in the direction of the filling 5 and come into contact with the filling at the points labeled 6. In the present exemplary embodiment, the cover 2 consists of sheet steel, and the beads 4 are introduced into the steel sheet by deep drawing. Instead of the beads which run parallel to one another in a direction, a grid of beads, preferably perpendicularly, crossing beads could also be provided and the holes 3 could have different hole shapes than in the exemplary embodiment shown. Could also the arrangement of the holes differ from that of the exemplary embodiment shown in FIG. 1 for a resonator backdrop. To ensure the function of the resonator cavity, it is not absolutely necessary, as in the exemplary embodiment according to FIGS. 1 and 2, for the holes to be arranged at grid spacings which are the same size in mutually perpendicular directions.

Die Summe der Querschnittsflächen der Löcher 3 beträgt im vorliegenden Ausführungsbeispiel 3% von der Gesamtoberfläche der Abdeckung 2. Dieser Anteil kann sich im Bereich von 0,1% - 3% von der Gesamtoberfläche bewegen. Die Tiefe der Vertiefungen ist der Größe der Löcher und dem vorgesehenen Grad der Bedämpfung der Resonatoren angepaßt.In the present exemplary embodiment, the sum of the cross-sectional areas of the holes 3 is 3% of the total surface of the cover 2. This proportion can range from 0.1% to 3% of the total surface. The depth of the depressions is adapted to the size of the holes and the intended degree of damping of the resonators.

Der in den Fig. 1 und 2 gezeigte Kasten 1 könnte auch als Rahmen ausgebildet und eine der Abdeckung 2 entsprechende Abdeckung auf der der Abdeckung 2 gegenüberliegenden Seite des Rahmens vorgesehen sein. Die Kulissen werden derart angeordnet, daß ein Gasstrom, dessen Geräusch gedämpft werden soll, an den mit den Löchern versehenen Abdeckungen vorbeiströmt.The box 1 shown in FIGS. 1 and 2 could also be designed as a frame and a cover corresponding to the cover 2 could be provided on the side of the frame opposite the cover 2. The backdrops are arranged in such a way that a gas flow, the noise of which is to be damped, flows past the covers provided with the holes.

Im Betriebsfall wird durch an der Resonatorkulisse vorbeiströmende Luft eine Sogwirkung auf die Füllung 5 ausgeübt. Die durch die Sicken 4 gebildeten, in Richtung auf die Füllung 5 vorstehenden Ausbuchtungen verhindern dabei, daß sich die Füllung auf die Abdeckung zu bewegt und insbesondere die Löcher 3 verschließt, was zu einer erheblichen Minderung der Schallabsorption durch die Resonatorkulisse führen würde.In the operating case, a suction effect is exerted on the filling 5 by air flowing past the resonator backdrop. The bulges formed by the beads 4 projecting in the direction of the filling 5 prevent the filling from moving towards the cover and in particular closing the holes 3, which would lead to a considerable reduction in sound absorption by the resonator backdrop.

Bei dem weiteren, in der Fig. 3 gezeigten Ausführungsbeispiel, in dem gleiche oder gleichwirkende Teile mit der gleichen, jedoch um 10 erhöhten Bezugszahl bezeichnet sind, ist mit 12 eine Abdeckung bezeichnet, in der im Querschnitt dreieckförmige Vertiefungen 14 vorgesehen sind, die sich vorteilhaft und mit geringem Aufwand durch Abkantung einer die Abdeckung bildenden Blechtafel herstellen lassen.In the further exemplary embodiment shown in FIG. 3, in which the same or equivalent parts have the same reference number, but increased by 10 are designated by 12, a cover is provided, in which triangular recesses 14 are provided in cross section, which can be produced advantageously and with little effort by folding a sheet metal sheet forming the cover.

Bei dem in Fig. 4 dargestellten Ausführungsbeispiel, in dem gleiche oder gleichwirkende Teile mit der gleichen, jedoch um 100 erhöhten Bezugszahl wie in der Fig. 1 dargestellt sind, sind punktförmige Vertiefungen 104a eingebracht, durch die Distanzelemente, die ein Anlegen der Füllung 105 an die Abdeckung 102 verhindern sollen, gebildet sind. Diese Vertiefungen können, gegebenenfalls auch zusammen mit Sicken, im Tiefziehverfahren in einem Arbeitsgang in eine die Abdeckung 102 bildende Blechtafel eingeprägt werden.In the exemplary embodiment shown in FIG. 4, in which the same or equivalent parts are shown with the same reference number, but increased by 100 as in FIG. 1, punctiform depressions 104a are introduced by the spacer elements, which put the filling 105 on to prevent the cover 102 are formed. These depressions can, if appropriate also together with beads, be embossed in one step into a sheet metal sheet forming the cover 102 using the deep-drawing process.

Die Ausbuchtungen können insbesondere so ausgebildet werden, daß sie um jeweils eine Öffnung zwischen der Abdeckung und der Füllung einen geschlossenen Hohlraum vorbestimmter Abmessungen und Volumens bilden.The bulges can in particular be designed so that they form a closed cavity of predetermined dimensions and volume around an opening between the cover and the filling.

Claims (10)

Resonatorkulisse für Kulissenschalldämpfer, mit einem Trägergehäuse oder -rahmen, in dem eine Füllung aus einem Absorbermaterial angeordnet ist, und wenigstens eine einem Strömungskanal zugewandte Fläche mit einer Lochungen aufweisenden Abdeckung versehen ist, die durch Distanzelemente zu der Füllung aus Absorbermaterial im Abstand gehalten ist, dadurch gekennzeichnet, daß die Distanzelemente durch in Richtung auf die Füllung vorstehende Ausbuchtungen der Abdeckung gebildet sind.Resonatorkulisse for setting muffler or frame with a carrier housing in which is disposed a filling of an absorber material, and at least a surface facing a flow passage area is provided with a perforation having cover which is maintained by spacer elements to the filling of absorber material at a distance, characterized characterized in that the spacer elements are formed by protrusions of the cover protruding towards the filling. Resonatorkulisse nach Anspruch 1, dadurch gekennzeichnet, daß die Ausbuchtungen im wesentlichen linien- oder/und punktförmig ausgebildet sind.Resonator backdrop according to claim 1, characterized in that the bulges are essentially linear or / and point-shaped. Resonatorkulisse nach Anspruch 2, dadurch gekennzeichnet, daß in einer Richtung verlaufende, im wesentlichen linienförmig ausgebildete Ausbuchtungen vorgesehen sind.Resonator backdrop according to claim 2, characterized in that bulges extending in one direction and substantially linear are provided. Resonatorkulisse nach Anspruch 2, dadurch gekennzeichnet, daß sich gitterartig kreuzende, linienförmige Ausbuchtungen vorgesehen sind.Resonator backdrop according to claim 2, characterized in that line-like bulges intersecting like a grid are provided. Resonatorkulisse nach Anspruch 4, dadurch gekennzeichnet, daß sich die linienförmigen Ausbuchtungen rechtwinklig kreuzen.Resonator backdrop according to claim 4, characterized in that the linear bulges intersect at right angles. Resonatorkulisse nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Ausbuchtung durch in die Abdeckung eingebrachte Vertiefungen gebildet sind.Resonator backdrop according to one of claims 1 to 5, characterized in that the bulge is formed by recesses made in the cover. Resonatorkulisse nach Anspruch 6, dadurch gekennzeichnet, daß die Vertiefungen durch Tiefzienen gebildet sind.Resonator backdrop according to claim 6, characterized in that the depressions are formed by deep cilia. Resonatorkulisse nach Anspruch 6, dadurch gekennzeichnet, daß die Vertiefungen durch Abkantung oder/und Biegung erzeugt sind.Resonator backdrop according to claim 6, characterized in that the depressions are produced by bending or / and bending. Resonatorkulisse nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Tiefe der Ausbuchtungen der Größe der Lochungen und dem vorgesehenen Grad der Bedämpfung der Resonatoren angepaßt ist.Resonator backdrop according to one of claims 1 to 8, characterized in that the depth of the bulges is adapted to the size of the perforations and the intended degree of damping of the resonators. Resonatorkulisse nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß das Verhältnis der Summe der Flächen der Lochungen zu der Gesamtfläche der Abdeckung etwa im Bereich von 0,1% und 3% liegt.Resonator backdrop according to one of claims 1 to 9, characterized in that the ratio of the sum of the areas of the perforations to the total area of the cover is approximately in the range of 0.1% and 3%.
EP19900125461 1990-03-09 1990-12-24 Resonator screen for a sound damping screen Withdrawn EP0445431A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4007556 1990-03-09
DE19904007556 DE4007556C2 (en) 1990-03-09 1990-03-09 Resonator backdrop for backdrop silencers

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Publication Number Publication Date
EP0445431A2 true EP0445431A2 (en) 1991-09-11
EP0445431A3 EP0445431A3 (en) 1992-10-21

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0504629A2 (en) * 1991-03-20 1992-09-23 Arthur Fries Panel-like sound absorbing element, and sound absorbing arrangement
EP0584442A1 (en) * 1992-08-25 1994-03-02 Firma Carl Freudenberg Covering element
US5422446A (en) * 1991-03-20 1995-06-06 Fries; Arthur Panel shaped element, specifically for sound absorbing structures and a sound absorbing installation
DE10122617C1 (en) * 2001-05-10 2002-06-20 Lta Lufttechnische Komponenten Sound-damping panel for ventilation plant has stabilized metal foil or plate spaced out on gas side of absorption material
US6622818B2 (en) * 1997-09-11 2003-09-23 Hrl Technology Pty Ltd. Sound attenuating device
EP1418569A1 (en) * 2002-11-06 2004-05-12 Calsonic Kansei Corporation Acoustic damper for exhaust system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2396868A1 (en) * 1977-07-07 1979-02-02 Snecma Combined thermal and noise insulation for jet pipes - has metallic honeycomb covered with layer of porous refractory material in metal casing
EP0013513A1 (en) * 1979-01-04 1980-07-23 Daempa A/S Sound absorbing structure
FR2462522A1 (en) * 1979-07-27 1981-02-13 Scal Gp Condit Aluminium Demountable noise barrier panel - uses lead membrane sandwiched between elastic sound absorbing material and is clad with aluminium sheet with reception face perforated

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2303610A1 (en) * 1973-01-25 1974-08-08 Costa Silard Dipl I Vasiljevic SILENCER
DE8525130U1 (en) * 1985-09-03 1985-10-24 Gerb Akustik Consult GmbH, 4300 Essen Silencer gate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2396868A1 (en) * 1977-07-07 1979-02-02 Snecma Combined thermal and noise insulation for jet pipes - has metallic honeycomb covered with layer of porous refractory material in metal casing
EP0013513A1 (en) * 1979-01-04 1980-07-23 Daempa A/S Sound absorbing structure
FR2462522A1 (en) * 1979-07-27 1981-02-13 Scal Gp Condit Aluminium Demountable noise barrier panel - uses lead membrane sandwiched between elastic sound absorbing material and is clad with aluminium sheet with reception face perforated

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0504629A2 (en) * 1991-03-20 1992-09-23 Arthur Fries Panel-like sound absorbing element, and sound absorbing arrangement
EP0504629A3 (en) * 1991-03-20 1993-06-16 Arthur Fries Panel-like element, in particular for sound absorbing arrangements, and sound absorbing arrangement
US5422446A (en) * 1991-03-20 1995-06-06 Fries; Arthur Panel shaped element, specifically for sound absorbing structures and a sound absorbing installation
EP0584442A1 (en) * 1992-08-25 1994-03-02 Firma Carl Freudenberg Covering element
US6622818B2 (en) * 1997-09-11 2003-09-23 Hrl Technology Pty Ltd. Sound attenuating device
DE10122617C1 (en) * 2001-05-10 2002-06-20 Lta Lufttechnische Komponenten Sound-damping panel for ventilation plant has stabilized metal foil or plate spaced out on gas side of absorption material
EP1418569A1 (en) * 2002-11-06 2004-05-12 Calsonic Kansei Corporation Acoustic damper for exhaust system

Also Published As

Publication number Publication date
DE4007556C2 (en) 1998-05-07
EP0445431A3 (en) 1992-10-21
DE4007556A1 (en) 1991-09-12

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