EP0029898A2 - Variable resonators for noise attenuation - Google Patents

Variable resonators for noise attenuation Download PDF

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Publication number
EP0029898A2
EP0029898A2 EP80106229A EP80106229A EP0029898A2 EP 0029898 A2 EP0029898 A2 EP 0029898A2 EP 80106229 A EP80106229 A EP 80106229A EP 80106229 A EP80106229 A EP 80106229A EP 0029898 A2 EP0029898 A2 EP 0029898A2
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European Patent Office
Prior art keywords
silators
struts
under
vacuum
skin
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Granted
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EP80106229A
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German (de)
French (fr)
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EP0029898B1 (en
EP0029898A3 (en
Inventor
Oskar Dipl.-Ing.Dr. Bschorr
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Airbus Defence and Space GmbH
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Messerschmitt Bolkow Blohm AG
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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 embodiments known primarily as Helmholtz resonators have a significantly higher volume and area requirement than the previously described embodiment and can therefore only be used to a limited extent.
  • the present invention has for its object to reduce the area and volume requirements of silators in the order of magnitude.
  • FIG. 1a and 1b show a top view and cross section of a silator element in the form of a plan frame 1, which has a square shape in the exemplary embodiment shown.
  • This frame is stretched by the four side struts 2.
  • Sub-struts 3 are now attached in a lattice shape, the individual ones Lattice connection points 4 are joined together.
  • the lower struts 3 are each slightly curved and therefore together form a pillow-like structure or contour. This is covered by a sheet metal skin 5 or foil etc. The volume thus formed is evacuated.
  • the arrangement and assembly of the lower struts 3 now form further square lower surfaces and the sheet 5 covering them receives a slight curvature again, the dimensions of which range from 1/20 to 1/200 of the span.
  • the sheet 5 and the struts 2 and 3 are each formed from a material with a high modulus of elasticity and low specific weight. Examples of such materials are: beryllium, aluminum, sheet steel, glass or carbon reinforced plastic or ceramic materials.
  • the lower surfaces of the silators form resonators which have an impedance dip in the region of their resonance frequency and thus result in sound insulation.
  • the natural frequencies of the bottom surfaces of the undersilators are set to different natural frequencies in order to ensure broadband sound insulation.
  • the sub-struts 3 together form a silator, which can be set to a resonance frequency that is independent of the subsilators.
  • the undersilators are expediently set to a high natural frequency and the silators to a lower natural frequency.
  • FIGS. 2a "and 2b is analogous to the previously described embodiment according to FIGS. 1a and 1b.
  • a silator 11 is stretched out by a circular outer strut 12.
  • a weakly curved system of again circular lower struts 13 is supported on this there is the sheet metal skin etc. 15.
  • Two halves 11a, 11b are combined to form a lenticular body, evacuating the inner space 16.
  • the effect of this embodiment is analogous to the square design, forming the lower surfaces 15 spanned by the struts 13
  • the entire embodiment also represents a silator.
  • the usable area has been doubled.
  • FIG. 3 now shows an exemplary embodiment with a triple hierarchical subdivision.
  • this shape is described using the example of a square plan shape.
  • the struts 22 again form the square planar base frame. This is subdivided by pillow-arched lower struts 23 and the latter are subdivided again by the lower sub-struts 24.
  • the sheet metal skin 25 is then stretched over the entire system. In each case an upper and lower half are joined together in the form of a pillow in a vacuum-tight manner and the resultant is formed
  • the cavity is evacuated.
  • This system consists of triple hierarchical silators. The natural frequencies of the silators are expediently set higher with increasing subdivisions.
  • Fig. 4 now shows an embodiment with a triangular outline of the silators and two subdivisions.
  • the plan floor plan is spanned by the struts 32.
  • Sub-struts 33 are based on this and all struts 32 and 33 are connected to one another at the nodes in a force-locking and torque-locking manner.
  • the lower struts 33 again have a curved contour, the curvature height being between 1/20 and 1/200 of the strut length.
  • a sheet metal skin 23 which is also in the best contact with the struts 32 and lower struts 33, now bulges over it.
  • the former span a silator and the latter form the undersilators.
  • FIG. 5 shows a silator with so-called "honeycomb areas" 40 in cross section.
  • These surfaces consist of the cover plates 41 and the honeycomb structure 42 arranged between them.
  • Two of these surfaces 40 each have a lisen-shaped curvature, the curvature height again being 1/20 to 1/200 of the diameter, and are glued to the edges 44 in a vacuum-tight manner.
  • the interior 43 thus formed is also evacuated again.
  • the natural frequency of the silator can be set by means of the curvature height or its selection and that of the free diameter.
  • FIG. 6 and 7 represent so-called damped silators 51 and 61, respectively.
  • a "constrained" coating is provided on the outside of the silator edge.
  • This covering is composed of the counter plate 52 and the damping material 53.
  • Fig. 7 an embodiment is shown in which the constrained coating within the silator space is organized and thus protected against aging etc.
  • the counter plate 62 and the damping material 63 are again arranged on the edge of the silator 61.
  • an anti-drumming coating which can expediently simultaneously serve as a protective lacquer against corrosion and for coloring.
  • the dimensions of the struts in length, width and height each have approximately the same relationships as for the sub-struts, sub-sub-struts, etc. That is to say: for example, is a sub-strut only half as long as its associated strut, so the width and height are halved.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Laminated Bodies (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

Die Erfindung bezieht sich auf mitschwingende, volumenändernde Resonatoren, die als Silatoren bezeichnet werden, und zur Lärmabsorption dienen, welche in einer hierarchischen Gliederung auf einem Grundrißrahmen aufgespannt sind, wobei das gesamte Strebensystem des Grundrahmens mit einer vakuumfesten Haut oder Folie aus Blech, Kunststoff oder anderem geeigneten Material überzogen ist. Hierbei sind jeweils eine Unter- und eine Oberseite der Haut vakuumdicht zusammengeführt und das sich so bildende Innenvolumen evakuiert.The invention relates to resonating, volume-changing resonators, which are referred to as silators, and are used for noise absorption, which are arranged in a hierarchical structure on a floor plan frame, the entire strut system of the base frame having a vacuum-resistant skin or film made of sheet metal, plastic or other suitable material is coated. In this case, a lower and an upper side of the skin are brought together in a vacuum-tight manner and the inner volume thus formed is evacuated.

Description

Durch die DE-OS 26 32 290.7 ist die Grundausbildung von mitschwingenden, volumenändernden Resonatoren - den sogenannten Silatoren - bekanntgeworden. Diese Silatoren bestehen aus zwei linsenförmig gewölbten Blechhälften, die miteinander vakuumdicht zusammengefügt sind, wobei der sich in den Wölbungen gebildete Raum jeweils evakuiert ist. Wie eingehend erläutert ist, weisen derartige Elemente eine Eigenfrequenz auf, die im wesentlichen durch Wandstärke, Wölbungshöhe und dem Durchmesser der linsenförmigen Volumina einstellbar ist.DE-OS 26 32 290.7 has made the basic training of resonating, volume-changing resonators - the so-called silators - known. These silators consist of two lenticularly curved sheet metal halves which are joined together in a vacuum-tight manner, the space formed in the curvatures being evacuated in each case. As explained in detail, elements of this type have a natural frequency which can be set essentially by means of the wall thickness, curvature height and the diameter of the lenticular volumes.

Die vorwiegend als Helmholtz-Resonatoren bekannten Ausführungsformen weisen gegenüber der vorbeschriebenen Ausführungsform einen wesentlich höheren Volumen- und Flächenbedarf auf und sind daher nur begrenzt einsetzbar.The embodiments known primarily as Helmholtz resonators have a significantly higher volume and area requirement than the previously described embodiment and can therefore only be used to a limited extent.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, den Flächen- und Volumenbedarf von Silatoren größenordnungsmäßig zu verringern.The present invention has for its object to reduce the area and volume requirements of silators in the order of magnitude.

Diese Aufgabe wird durch die in den Ansprüchen niegelegten Maßnahmen gelöst. Die Beschreibung erläu÷ tert in Ausführungsbeispielen die vorgeschlagenen Maßnahmen und die Zeichnung zeigt,in schematischer Darstellung diese Ausführungsformen. Durch die vorgeschlagene hierarchische Untergliederung der Silatoren, wobei in einem Silator der ersten Stufe mehrere Subsilatoren integriert sind, gelingt bereits eine doppelte Flächenausnutzung. Bei n-facher Untergliederung ergibt sich resultierend auch ein n-facher Ausnutzungsgrad für die Fläche. In der Zeichnung zeigen:

  • Fig. 1a eine Draufsicht auf ein Silatorelement mit 2facher Stufenhierarchie in schematischer Darstellung,
  • Fig. 1b einen"Querschnitt gemäß der Ausführungsform nach Fig. 1a in schematischer Darstellung,
  • Fig. 2a eine Draufsicht eines Silatorelementes mit kreisförmiger Fläche mit zweifacher Stufenhierarchie in schematischer Darstellung,
  • Fig. 2b einen Querschnitt der Ausführungsform gemäß Fig. 2a in schematischer Darstellung,
  • Fig. 3 eine Draufsicht auf ein Silatorelement mit quadratischem Grundriß und dreifacher Stufenhierarchie in schematischer Darstellung,
  • Fig. 4 eine Draufsicht auf ein Silatorelement mit dreieckförmigem Grundriß und zweifacher Stufenhierarchie in schematischer Darstellung,
  • Fig. 5 einen Querschnitt durch ein Silatorelement mit sog. Honeycomb-Flächen in schematischer Darstellung,
  • Fig. 6 einen Querschnitt durch ein Silatorelement mit Bedämpfung in schematischer Darstellung,
  • Fig. 7 einen Querschnitt durch ein Silatorelement mit Randbedämpfung in schematischer Darstellung.
This object is achieved by the measures laid down in the claims. The description explains the proposed measures in exemplary embodiments and the drawing shows these embodiments in a schematic representation. The proposed hierarchical subdivision of the silators, with several subsilators being integrated in a silator of the first stage, already enables a double use of space. With an n-fold subdivision, the result is an n-fold utilization rate for the area. The drawing shows:
  • 1a is a plan view of a silator element with a double level hierarchy in a schematic representation,
  • 1b is a "cross section according to the embodiment of FIG. 1a in a schematic representation,
  • 2a shows a schematic top view of a silator element with a circular surface with a double step hierarchy,
  • 2b shows a cross section of the embodiment of FIG. 2a in a schematic representation,
  • 3 shows a schematic top view of a silator element with a square plan and a triple hierarchy of levels,
  • 4 shows a schematic view of a top view of a silator element with a triangular plan and a double step hierarchy,
  • 5 shows a cross section through a silator element with so-called honeycomb areas in a schematic representation,
  • 6 shows a cross section through a silator element with damping in a schematic representation,
  • Fig. 7 shows a cross section through a silator element with edge damping in a schematic representation.

Die Fig. 1a und 1b zeigen in Draufsicht und Querschnitt ein Silatorelement in Form eines Grundrißrahmens 1, der in dem gezeigten Ausführungsbeispiel quadratische Form aufweist. Durch die vier Seitenstreben 2 wird dieser Rahmen aufgespannt. Darin sind nun Unterstreben 3 gitterförmig angebracht, wobei die einzelnen Gitterverbindungspunkte 4 miteinander zusammengefügt sind. Die Unterstreben 3 sind jeweils schwach gewölbt und bilden daher zusammen eine kissenförmige Struktur bzw. Kontur. Diese ist durch eine Blechhaut 5 oder Folie etc. belegt. Das so gebildete Volumen wird evakuiert. Durch die Anordnung und Zusammenfügung der Unterstreben 3 bilden sich nun weitere quadratische Unterflächen und das diese überdeckende Blech 5 erhält wieder eine schwache Wölbung, deren Ausmaße von 1/20 bis 1/200 der Spannweite betragen. Das Blech 5 und die Streben 2 bzw. 3 sind jeweils aus einem Material mit hohem Elastizitätsmodul und geringem spezifischen Gewicht gebildet. Als Beispiele für solche Materialien seien genannt: Beryllium, Aluminium, Stahlblech, glas- oder kohlenstoffverstärkter Kunststoff oder auch keramische Stoffe.1a and 1b show a top view and cross section of a silator element in the form of a plan frame 1, which has a square shape in the exemplary embodiment shown. This frame is stretched by the four side struts 2. Sub-struts 3 are now attached in a lattice shape, the individual ones Lattice connection points 4 are joined together. The lower struts 3 are each slightly curved and therefore together form a pillow-like structure or contour. This is covered by a sheet metal skin 5 or foil etc. The volume thus formed is evacuated. The arrangement and assembly of the lower struts 3 now form further square lower surfaces and the sheet 5 covering them receives a slight curvature again, the dimensions of which range from 1/20 to 1/200 of the span. The sheet 5 and the struts 2 and 3 are each formed from a material with a high modulus of elasticity and low specific weight. Examples of such materials are: beryllium, aluminum, sheet steel, glass or carbon reinforced plastic or ceramic materials.

Die Unterflächen der Silatoren bilden Resonatoren, die im Bereich ihrer Resonanzfrequenz einen Impedanzeinbruch aufweisen und so eine Schalldämmung ergeben. Je nach Herstellungsgenauigkeit sind die Eigenfrequenzen der Unterflächen der Untersilatoren auf verschiedene Eigenfrequenzen eingestellt, um so eine breitbandige Schalldämmung zu gewährleisten. Darüberhinaus bilden auch die Unterstreben 3 zusammen einen Silator, der auf eine unabhängig von den Untersilatoren eigene Resonanzfrequenz eingestellt werden kann. Zweckmäßigerweise werden die Untersilatoren auf eine hohe und die Silatoren auf eine tiefere Eigenfrequenz eingestellt. Durch die hierarchische Überlagerung gelingt es nun, die Fläche mittels des vorbeschriebenen Ausführungsbeispiels doppelt auszunutzen.The lower surfaces of the silators form resonators which have an impedance dip in the region of their resonance frequency and thus result in sound insulation. Depending on the manufacturing accuracy, the natural frequencies of the bottom surfaces of the undersilators are set to different natural frequencies in order to ensure broadband sound insulation. In addition, the sub-struts 3 together form a silator, which can be set to a resonance frequency that is independent of the subsilators. The undersilators are expediently set to a high natural frequency and the silators to a lower natural frequency. The hierarchical overlay now makes it possible to utilize the area twice by means of the exemplary embodiment described above.

Das Ausführungsneispiel gemäß den Fig. 2a"und 2b ist analog zu der vorbeschriebenen Ausführungsform gemäß den Fig. 1a und 1b. Ein Silator 11 wird durch eine kreisförmige Außenstrebe 12 aufgespannt. Darauf stützt sich ein schwach gewölbtes System von wieder kreisförmigen Unterstreben 13 ab. Darüber befindet sich die Blechhaut etc. 15. Je zwei Hälften 11a, 11b sind zu einem linsenförmigen Körper zusammengefaßt, wobei der sich bildende Innenraum 16 evakuiert wird. Die Wirkung dieser Ausführungsform ist analog zu der quadratischen Ausgestaltung. Die durch die Unterstreben 13 aufgespannten Unterflächen 15 bilden sogenannte Untersilatoren. Ebenso stellt die gesamte Ausführungsform ebenfalls einen Silator dar. Auch hier ist die Nutzungsfläche verdoppelt worden.The exemplary embodiment according to FIGS. 2a "and 2b is analogous to the previously described embodiment according to FIGS. 1a and 1b. A silator 11 is stretched out by a circular outer strut 12. A weakly curved system of again circular lower struts 13 is supported on this there is the sheet metal skin etc. 15. Two halves 11a, 11b are combined to form a lenticular body, evacuating the inner space 16. The effect of this embodiment is analogous to the square design, forming the lower surfaces 15 spanned by the struts 13 The entire embodiment also represents a silator. Here, too, the usable area has been doubled.

Die Fig. 3 zeigt nun ein Ausführungsbeispiel mit dreifacher hierarchischer Untergliederung. Um das Ausführungsbeispiel in einfacher Weise verdeutlichen zu können, wird diese Form am Beispiel einer quadratischen Grundrißform beschrieben, Die Streben 22 bilden wieder den quadratischen planen Grundrahmen. Dieser ist durch kissenförmig gewölbte Unterstreben 23 unterteilt und letztere werden wieder unterteilt durch die Unter-Unterstreben 24. Über das gesamte System spannt sich sodann die Blechhaut 25. Je eine Ober- und Unterhälfte sind in Form eines Kissens vakuumdicht miteinander zusammengefügt und der sich so bildende Hohlraum wird evakuiert. Dieses System besteht also aus dreifach hierarchisch gegliederten Silatoren. Zweckmäßigerweise werden mit größer werdenden Untergliederungen die Eigenfrequenzen der Silatoren höher eingestellt.3 now shows an exemplary embodiment with a triple hierarchical subdivision. In order to be able to clarify the exemplary embodiment in a simple manner, this shape is described using the example of a square plan shape. The struts 22 again form the square planar base frame. This is subdivided by pillow-arched lower struts 23 and the latter are subdivided again by the lower sub-struts 24. The sheet metal skin 25 is then stretched over the entire system. In each case an upper and lower half are joined together in the form of a pillow in a vacuum-tight manner and the resultant is formed The cavity is evacuated. This system consists of triple hierarchical silators. The natural frequencies of the silators are expediently set higher with increasing subdivisions.

Die Fig. 4 zeigt nun ein Ausführungsbeispiel mit dreieckförmigem Grundriß der Silatoren und zweifacher Untergliederung. Der plane Grundrißrahmen wird durch die Streben 32 aufgespannt. Darauf stützen sich Unterstreben 33 und alle Streben 32 bzw. 33 sind an den Knotenpunkten kraft- und momentenschlüssig miteinander verbunden. Die Unterstreben 33 weisen wieder eine gewölbte Kontur auf, wobei die Wölbungshöhe zwischen 1/20 und 1/200 der Strebenlänge beträgt.Fig. 4 now shows an embodiment with a triangular outline of the silators and two subdivisions. The plan floor plan is spanned by the struts 32. Sub-struts 33 are based on this and all struts 32 and 33 are connected to one another at the nodes in a force-locking and torque-locking manner. The lower struts 33 again have a curved contour, the curvature height being between 1/20 and 1/200 of the strut length.

Darüber nun wölbt sich wieder eine Blechhaut 23, die ebenfalls in bestem Kontakt mit den Streben 32 und Unterstreben 33 ist. Die ersteren spannen dabei einen Silator auf und die letzteren bilden die Untersilatören.A sheet metal skin 23, which is also in the best contact with the struts 32 and lower struts 33, now bulges over it. The former span a silator and the latter form the undersilators.

Die Fig. 5 zeigt einen Silator mit sogenannten "Honeycomb-Flächen" 40 im Querschnitt. Diese Flächen bestehen aus den Deckblechen 41 und der dazwischen angeordneten Wabenstruktur 42. Je zwei dieser Flächen 40 haben eine lisenförmige Wölbung, wobei wiederum die Wölbungshöhe 1/20 bis 1/200 des Durchmessers beträgt, und sind vakuumdicht an den Rändern 44 verklebt. Der sich so bildende Innenraum 43 ist ebenfalls wieder evakuiert. Mittels der Wölbungshöhe bzw. deren Auswahl und derjenigen des freien Durchmessers kann die Eigenfrequenz des Silators eingestellt werden.5 shows a silator with so-called "honeycomb areas" 40 in cross section. These surfaces consist of the cover plates 41 and the honeycomb structure 42 arranged between them. Two of these surfaces 40 each have a lisen-shaped curvature, the curvature height again being 1/20 to 1/200 of the diameter, and are glued to the edges 44 in a vacuum-tight manner. The interior 43 thus formed is also evacuated again. The natural frequency of the silator can be set by means of the curvature height or its selection and that of the free diameter.

Die Fig. 6 und 7 stellen sogenannte gedämpfte Silatoren 51 bzw. 61 dar. In dem Ausführungsbeispiel gemäß Fig. 6 ist ein "eingezwängter" Belag auf der Außenseite des Silatorrandes vorgesehen. Dieser Belag setzt sich aus dem Konterblech 52 und dem Dämpfungsstoff 53 zusammen. In Fig. 7 ist eine Ausführungsform gezeigt, in der der eingezwängte Belag innerhalb des Silatorraumes angeordnet ist und so gegen Alterung etc, geschützt ist. Das Konterblech 62 und der Dämpfungsstoff 63 sind wieder am Rand des Silators 61 angeordnet. Die vorbeschriebenen Ausführungsformen können nun mit einem Antidröhnbelag versehen werden, der zweckmäßigerweise gleichzeitig als Schutzlack gegen Korrosion und zur Farbgebung dienen kann.6 and 7 represent so-called damped silators 51 and 61, respectively. In the exemplary embodiment according to FIG. 6, a "constrained" coating is provided on the outside of the silator edge. This covering is composed of the counter plate 52 and the damping material 53. In Fig. 7, an embodiment is shown in which the constrained coating within the silator space is organized and thus protected against aging etc. The counter plate 62 and the damping material 63 are again arranged on the edge of the silator 61. The above-described embodiments can now be provided with an anti-drumming coating, which can expediently simultaneously serve as a protective lacquer against corrosion and for coloring.

Abschließend sei noch gesagt, daß die Abmessungen der Streben in Länge, Breite und Höhe jeweils ungefähr die gleichen Relationen aufweisen, wie bei den Unterstreben, Unter-Unterstreben usw. Das heißt: ist beispielsweise eine Unterstrebe nur halb so lang, wie ihre zugeordnete Strebe, so halbiert sich bei ihr auch Breite und Höhe.Finally, it should be said that the dimensions of the struts in length, width and height each have approximately the same relationships as for the sub-struts, sub-sub-struts, etc. That is to say: for example, is a sub-strut only half as long as its associated strut, so the width and height are halved.

Durch die vorgeschlagenen Silatoren bzw. deren hierarchische Gliederung ist nun eine optimale Flächenausnutzung gegeben.Due to the proposed silators and their hierarchical structure, an optimal use of space is given.

Claims (6)

1. Mitschwingende, volumenändernde Resonatoren - sogenannte Silatoren - zur Lärmreduzierung bzw. -absorption, dadurch gekennzeichnet, daß über einen von Streben (2) aufgespannten Grundrißrahmen (1) mit einer Wölbungshöhe von 1/20 bis 1/200 der freien Spannweite Unterstreben (3) überspannt sind und ggf. über diese sich im selben Wölbungs/ Spannweitenverhältnis Unter-Unterstreben (24) spannen und so fort, wobei das gesamte Strebensystem mit ciner vakuumfeston Haut bzw. Fclio (5) aus Blech Kunststoff oder ähnlich geeignten Materialen überzogen ist und je eine Unter (1a)- und Oberhälfte (1b) vakuumdicht zusammengefügt ist und das sich bildende Innenvolumen (1c) evakuiert ist.1. resonating, volume-changing resonators - so-called silators - for noise reduction or absorption, characterized in that over a strut (2) spanned outline frame (1) with a curvature height of 1/20 to 1/200 of the free span underrun (3 ) are spanned and, if necessary, stretch over them in the same curvature / span ratio under-struts (24) and so on, whereby the entire strut system with ciner vacuum-resistant skin or Fclio (5) made of sheet metal plastic or similar suitable materials is drawn and a lower (1a) - and upper half (1b) is vacuum-tightly joined and the inner volume (1c) that is evacuated. 2. Silatoren nach Anspruch 1, dadurch gekennzeichnet, daß die Streben (2)/(24) und die Deckhaut (5) aus einem Material mit möglichst hohem Elastizitätsmodul und kleinem spezifischen Gewicht bestehen und an den gemeinsamen Knotenpunkten (4) kraft- und momentschlüssig verbunden sind.2. Silators according to claim 1, characterized in that the struts (2) / (24) and the cover skin (5) consist of a material with the highest possible modulus of elasticity and low specific weight and at the common nodes (4) non-positively and momentarily are connected. 3. Silatoren nach Anspruch 1 und 2, dadurch gekennzeichnet, daß mit zunehmender hierarchischer Unterordnung die Eigenfrequenzen der Silatoren steigen.3. Silators according to claim 1 and 2, characterized in that the natural frequencies of the silators increase with increasing hierarchical subordination. 4. Silatoren nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet, daß die einzelnen Silatoren zu einem Flächenverband zusammengefaßt sind.4. Silators according to claims 1 to 3, characterized in that the individual silators are combined to form a polysurface. 5. Silatoren nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet, daß sich die geometrischen Abmessungen der Streben (2, 22, 32 etc.) Unterstreben (3, 23) Unter-Unterstreben (24 etc.) usw. im wesentlichen jeweils dieselben Größenrelationen aufweisen.5. Silators according to claims 1 to 4, characterized in that the geometric dimensions of the struts (2, 22, 32 etc.) under-struts (3, 23) under-under-struts (24 etc.) etc. essentially each have the same size relations exhibit. 6. Silatoren nach den Ansprüchen 1 bis 5, dadurch gekennzeichnet, daß zur Dämpfung der Silatoren, Untersilatoren usw. die Blech- bzw. Folienhaut mit einem Antidröhnbelag oder einem sogenannten "eingezwängten" Belag versehen ist.6. Silators according to claims 1 to 5, characterized in that for damping the silators, undersilators etc. the sheet metal or foil skin is provided with an anti-drumming coating or a so-called "constrained" coating.
EP80106229A 1979-11-22 1980-10-14 Variable resonators for noise attenuation Expired EP0029898B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80106229T ATE13232T1 (en) 1979-11-22 1980-10-14 VOLUME CHANGING RESONATORS FOR NOISE REDUCTION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2947026 1979-11-22
DE2947026A DE2947026C2 (en) 1979-11-22 1979-11-22 Silators to reduce noise

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EP0029898A2 true EP0029898A2 (en) 1981-06-10
EP0029898A3 EP0029898A3 (en) 1981-08-26
EP0029898B1 EP0029898B1 (en) 1985-05-08

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US (1) US4325461A (en)
EP (1) EP0029898B1 (en)
AT (1) ATE13232T1 (en)
DE (1) DE2947026C2 (en)

Cited By (1)

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Also Published As

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ATE13232T1 (en) 1985-05-15
US4325461A (en) 1982-04-20
DE2947026C2 (en) 1981-10-01
EP0029898B1 (en) 1985-05-08
DE2947026B1 (en) 1980-11-27
EP0029898A3 (en) 1981-08-26

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