EP0029506A1 - Device for reducing the noise of exhaust or of waste gas - Google Patents

Device for reducing the noise of exhaust or of waste gas Download PDF

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Publication number
EP0029506A1
EP0029506A1 EP80106431A EP80106431A EP0029506A1 EP 0029506 A1 EP0029506 A1 EP 0029506A1 EP 80106431 A EP80106431 A EP 80106431A EP 80106431 A EP80106431 A EP 80106431A EP 0029506 A1 EP0029506 A1 EP 0029506A1
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EP
European Patent Office
Prior art keywords
silators
exhaust
impedance
exhaust duct
noise
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP80106431A
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German (de)
French (fr)
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EP0029506B1 (en
Inventor
Oskar Dr. Bschorr
Eckehard Laudien
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.)
Airbus Defence and Space GmbH
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Messerschmitt Bolkow Blohm AG
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Publication of EP0029506A1 publication Critical patent/EP0029506A1/en
Application granted granted Critical
Publication of EP0029506B1 publication Critical patent/EP0029506B1/en
Expired legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/22—Silencing apparatus characterised by method of silencing by using movable parts the parts being resilient walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/14—Dead or resonance chambers connected to gas flow tube by relatively short side-tubes

Definitions

  • the invention relates to a device for reducing the exhaust or exhaust noise of internal combustion engines, thermodynamic systems, etc., - by means of silators.
  • silencers have been proposed in various forms to dampen the noise of exhaust or exhaust systems, but they are all based on the same relatively few basic principles, which are primarily absorption systems on open-pore materials, insulation by means of coordinated resonance volumes and impedance jumps. All of these known devices require relatively large designs and also these silencers are subject to very strong signs of corrosion and the frequently occurring implementation of the absorption materials.
  • the invention has for its object to provide a device of the type mentioned, which allows exhaust or exhaust systems to be reduced in volume, but to increase the muffler effect.
  • silators - Due to the proposed resonating resonators - which are referred to as silators - which are integrated with the exhaust gas channel, an impedance dip occurs in the region of their resonance frequency, which causes reflection. If several silators tuned to different frequencies are now arranged, broadband sound insulation is achieved in a simple manner. If the silators are damped, as provided for by a feature of the invention, they also absorb sound due to their resistance and the silator walls are provided with a Anti-drumming covering, so there is sound absorption. To reduce the vibrating mass. it is advantageous here if only the edge parts are provided with the covering. Of course, it is of course also possible to use the known method of using counter leaflets.
  • FIG. 1a and 1b show a schematic representation of sections through an exhaust or exhaust duct 1 which is provided with the silators 2 according to the proposal of the invention.
  • These are lenticular vacuum spaces made of sheet metal, etc.
  • Such silators are described in detail in DE-OS 26 32 290.
  • Such elements have pronounced resonances, the impedances of which are below that of the air. Overall, this results in an impedance jump with an effective insulation effect.
  • several silators tuned to different frequencies are used. These are housed in a protective housing 4 and shielded against the exhaust duct 1 with metal wool 3. Instead of metal wool, other materials or perforated sheet metal, etc. can also be used.
  • FIG. 2 shows an analog design to FIG. 1, consisting of exhaust duct 11, silators 12 and protective housing 14. Between the silators 12 there is a sound-permeable material 13, for example metal wool. The mode of operation is also the same as described in FIG. 1.
  • FIG 3 again shows a longitudinal section through an exhaust duct 21 provided with a muffler, which in this case is formed divergent at its gas outlet in the direction of flow.
  • a muffler which in this case is formed divergent at its gas outlet in the direction of flow.
  • the silators 22 and 26 Above the exhaust duct 21 are the silators 22 and 26, the former being dimensioned such that their impedance is less than the air impedance and the latter 26 are damped and approximately matched to the air impedance. This ensures optimal sound absorption.
  • the silators 22 and 26 are accommodated in a protective housing 24, which has an opening 25 on one side.
  • a perforated plate 23 is located between the exhaust duct 21 and the silators 22 and 26. As a result of the Bernouli underpressure in the divergent-ending exhaust duct 21, outside air is sucked in through the perforated plate 23, which cools the silators 22, 26.
  • the arrows indicate the direction of flow of the cooling air.
  • Fig. 4 shows an embodiment according to the invention, which is essentially analogous to that shown in Figs. 1a and 1b.
  • Silators 32 are arranged around an exhaust duct 31 on two opposite sides. These are again in a protective housing 34 and are separated from the exhaust duct 31 by means of a sound-permeable material 33.
  • FIG. 6 shows an exemplary embodiment with damped silators 51. These have, preferably in the region of the exhaust gas jet, a damping coating or anti-drumming agent 52, which is covered by a contour plate 53. In order not to increase the resonating mass of the silators 51, this assignment is preferably located in the edge region of the silators 51. Due to this damping of the silators, they also absorb the sound due to their resistance.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Abstract

Die Erfindung bezieht sich auf eine Einrichtung zur Reduzierung des Lärmes von Verbrennungsmotoren im Betrieb unter Verwendung von Silatoren, die an oder in dem Abgas- oder Auspuffkanal angeordnet sind, wobei diese Silatoren auf verschiedene Frequenzen abgestimmt sind und deren Impedanz kleiner als die Luftimpedanz ist und somit eine breitbandige Schalldämmung erzielt wird. Durch Bedämpfen der Silatoren absorbieren diese ebenfalls Schall und werden diese mit einem Antidröhnbelag versehen, so erfolgt Schallabsorption. Damit wird eine Volumenverkleinerung der Abgas- und Auspuffsysteme ermöglicht, die Schalldämmungswirkung jedoch erhöht.The invention relates to a device for reducing the noise of internal combustion engines in operation using silators, which are arranged on or in the exhaust or exhaust duct, these silators are tuned to different frequencies and their impedance is smaller than the air impedance and thus broadband sound insulation is achieved. By damping the silators, they also absorb sound and if they are provided with an anti-drumming coating, sound absorption takes place. This enables the exhaust and exhaust systems to be reduced in volume, but increases the sound insulation effect.

Description

Die Erfindung bezieht sich auf eine Einrichtung zur Reduzierung des Auspuff- oder Abgaslärmes von Verbrennungsmotoren, thermodynamischen Anlagen etc., - mittels Silatoren.The invention relates to a device for reducing the exhaust or exhaust noise of internal combustion engines, thermodynamic systems, etc., - by means of silators.

Zur Dämpfung des Lärmes von Abgas- oder Auspuffsystemen sind in vielfältiger Form sogenannte Schalldämpfer vorgeschlagen worden, die jedoch alle auf denselben relativ wenigen Grundprinzipien fußen, wobei es sich vorwiegend um Absorptionssysteme an offenporigen Stoffen, um Dämmung durch aufeinander abgestimmte Resonanzvoluminas und Impedanzsprünge handelt. Alle diese bekannten Einrichtungen erfordern relativ große Bauweisen und außerdem unterliegen diese Schalldämpfer sehr starken Korrosionsserscheinungen sowie der häufig auftretenden Umsetzung der Absorptionsstoffe.So-called silencers have been proposed in various forms to dampen the noise of exhaust or exhaust systems, but they are all based on the same relatively few basic principles, which are primarily absorption systems on open-pore materials, insulation by means of coordinated resonance volumes and impedance jumps. All of these known devices require relatively large designs and also these silencers are subject to very strong signs of corrosion and the frequently occurring implementation of the absorption materials.

Der Erfindung liegt die Aufgabe zugrunde, eine Einrichtung der eingangs genannten Art zu schaffen, die es erlaubt, Abgas- oder Auspuffsysteme vom Volumen her zu verkleinern, die Schalldämpferwirkung jedoch zu erhöhen.The invention has for its object to provide a device of the type mentioned, which allows exhaust or exhaust systems to be reduced in volume, but to increase the muffler effect.

Diese Aufgabe wird durch die in den Ansprüchen vorgeschlagenen Maßnahmen in überraschend einfacher und wirkungsvoller Weise gelöst.This task is featured by the in the claims proposed measures in a surprisingly simple and effective manner.

Durch die vorgeschlagenen mitschwingenden Resonatoren - die als Silatoren bezeichnet werden - die mit dem Abgaskanal integriert sind, tritt im Bereich deren Resonanzfrequenz ein Impedanzeinbruch auf, der eine Reflexion bewirkt. Werden nun mehrere auf verschiedene Frequenzen abgestimmte Silatoren angeordnet, so wird damit in einfacher Weise eine breitbandige Schalldämmung erreicht, Bedämpft man nun die Silatoren, wie es ein Merkmal der Erfindung vorsieht, so absorbieren diese aufgrund ihrer Resistenz ebenfalls Schall und versieht man die Silatorenwandungen mit einem Antidröhnbelag, so erfolgt Schallabsorption. Um die mitschwingende Masse zu verringern,. ist es hierbei vorteilhaft, wenn nur die Randpartien mit dem Belag versehen werden. Selbstverständlich ist es natürlich auch möglich, sich der an sich bekannten Methode der Verwendung von Konterblättchen zu bedienen.Due to the proposed resonating resonators - which are referred to as silators - which are integrated with the exhaust gas channel, an impedance dip occurs in the region of their resonance frequency, which causes reflection. If several silators tuned to different frequencies are now arranged, broadband sound insulation is achieved in a simple manner.If the silators are damped, as provided for by a feature of the invention, they also absorb sound due to their resistance and the silator walls are provided with a Anti-drumming covering, so there is sound absorption. To reduce the vibrating mass. it is advantageous here if only the edge parts are provided with the covering. Of course, it is of course also possible to use the known method of using counter leaflets.

Die Erfindung.ist nachfolgend an Ausführungsbeispielen beschrieben und erläutert sowie in der Zeichnung dargestellt. Es zeigen

  • Fig. 1a einen Längsschnitt durch einen Auspuffkanal in schematischer Darstellung,
  • Fig. 1b einen Querschnitt entlang der Linie A-A gemäß Fig. 1 in schematischer Darstellung,
  • Fig. 2 einen Querschnitt durch einen Schalldämpfer mit Absorptionssystem in schematischer Darstellung,
  • Fig. 3 einen Längsschnitt durch ein Abgassystem mit divergentem Auslaßkanal als Selbstkühlsystem in schematischer Darstellung,
  • Fig. 3 einen Querschnitt durch ein weiteres Ausführungsbeispiel einer Dämpfungsanordnung,
  • Fig. 5 einen Querschnitt durch einen Schalldämpfer mit sogenannter "Heat-pipe"-Kühlung in schematischer Darstellung,
  • Fig. 6 einen Querschnitt einer Ausführungsform eines bedämpften Silatorelementes in schematischer Darstellung.
The invention is described and explained below using exemplary embodiments and shown in the drawing. Show it
  • 1a shows a longitudinal section through an exhaust duct in a schematic representation,
  • 1b shows a cross section along the line AA of FIG. 1 in a schematic representation,
  • 2 shows a cross section through a silencer with absorption system in a schematic representation,
  • 3 shows a longitudinal section through an exhaust system with a divergent outlet channel as a self-cooling system in a schematic representation,
  • 3 shows a cross section through a further exemplary embodiment of a damping arrangement,
  • 5 shows a cross section through a silencer with so-called "heat pipe" cooling in a schematic representation,
  • Fig. 6 shows a cross section of an embodiment of a damped silator element in a schematic representation.

Die Fig. 1a und 1b zeigen in schematischer Darstellung Schnitte durch einen Abgas- oder Auspuffkanal 1 der mit den Silatoren 2 gemäß dem Vorschlag nach der Erfindung versehen ist. Hierbei handelt es sich um linsenförmige, aus Blech etc. gebildete Unterdruckräume. Solche Silatoren sind in der DE-OS 26 32 290 ausführlich beschrieben. Derartige Elemente weisen ausgeprägte Resonanzen auf, deren Impedanzen unterhalb derjenigen der Luft liegen. Insgesamt ergibt sich so ein Impedanzsprung mit effektiver Dämmwirkung. Um diese auch breitbandig zu machen, sind mehrere auf verschiedenen Frequenzen abgestimmte Silatoren eingesetzt. Diese sind in einem Schutzgehäuse 4 untergebracht und gegen den Abgaskanal 1 hin mit Metallwolle 3 abgeschirmt. Statt der Metallwolle können auch andere Stoffe oder perforiertes Blech etc. verwendet werden.1a and 1b show a schematic representation of sections through an exhaust or exhaust duct 1 which is provided with the silators 2 according to the proposal of the invention. These are lenticular vacuum spaces made of sheet metal, etc. Such silators are described in detail in DE-OS 26 32 290. Such elements have pronounced resonances, the impedances of which are below that of the air. Overall, this results in an impedance jump with an effective insulation effect. In order to make them broadband as well, several silators tuned to different frequencies are used. These are housed in a protective housing 4 and shielded against the exhaust duct 1 with metal wool 3. Instead of metal wool, other materials or perforated sheet metal, etc. can also be used.

Die Fig. 2 zeigt zur Fig. 1 eine analoge Ausführung, bestehend aus Abgaskanal 11, Silatoren 12 und Schutzgehäuse 14. Zwischen den Silatoren 12 befindet sich ein schalldurchgängiger Stoff 13 z.B. Metallwolle. Auch die Wirkungsweise ist dieselbe, wie in Fig. 1 beschrieben.2 shows an analog design to FIG. 1, consisting of exhaust duct 11, silators 12 and protective housing 14. Between the silators 12 there is a sound-permeable material 13, for example metal wool. The mode of operation is also the same as described in FIG. 1.

Die Fig. 3 zeigt wieder einen Längsschnitt durch einen mit einem Schalldämpfer versehenen Auspuffkanal 21, der in diesem Falle an seinem Gasaustritt in Strömungsrichtung divergent augebildet ist. Über dem Abgaskanal 21 sitzen die Silatoren 22 und 26, wobei die ersteren so dimensioniert sind, daß deren Impedanz kleiner als die Iuftimpedanz ist und die letzteren 26 sind bedämpft und ungefähr auf die Luftimpedanz abgestimmt. Dadurch ist eine optimale Schallabsorption gewährleistet. Die Silatoren 22 und 26 sind in einem Schutzgehäuse 24 untergebracht,,das an einer Seite eine Öffnung 25 aufweist. Zwischen dem Abgaskanal 21 und den Silatoren 22 und 26 befindet sich ein perforiertes Blech 23. Infolge des Bernouli-Unterdruckes im divergent endenden Abgaskanals 21 wird durch das perforierte Blech 23 Außenluft angesaugt, die eine kühlung der Silatoren 22, 26 bewirkt. In der Zeichnung geben die Pfeile die Strömungsrichtung der Kühlluft an.3 again shows a longitudinal section through an exhaust duct 21 provided with a muffler, which in this case is formed divergent at its gas outlet in the direction of flow. Above the exhaust duct 21 are the silators 22 and 26, the former being dimensioned such that their impedance is less than the air impedance and the latter 26 are damped and approximately matched to the air impedance. This ensures optimal sound absorption. The silators 22 and 26 are accommodated in a protective housing 24, which has an opening 25 on one side. A perforated plate 23 is located between the exhaust duct 21 and the silators 22 and 26. As a result of the Bernouli underpressure in the divergent-ending exhaust duct 21, outside air is sucked in through the perforated plate 23, which cools the silators 22, 26. In the drawing, the arrows indicate the direction of flow of the cooling air.

Die Fig. 4 zeigt ein Ausführungsbeispiel nach der Erfindung, das im wesentlichen analog zu demjenigen ist, das in den Fig. 1a und 1b gezeigt ist. Um einen Abgaskanal 31 sind an zwei einander gegenüberliegenden Seiten Silatoren 32 angeordnet. Diese befinden sich wieder in einem Schutzgehäuse 34 und sind zum Abgaskanal 31 mittels eines schalldurchlässigen Stoffes 33 abgetrennt.Fig. 4 shows an embodiment according to the invention, which is essentially analogous to that shown in Figs. 1a and 1b. Silators 32 are arranged around an exhaust duct 31 on two opposite sides. These are again in a protective housing 34 and are separated from the exhaust duct 31 by means of a sound-permeable material 33.

Im Ausführungsbeispiel der Fig. 5 ragen die Silatoren in den Abgas- bzw. Strömungskanal hinein. Um nun die Silatoren 42 gegen die auftretende Wärme zu schützen, befindet sich in deren Innenraum eine hochsiedende Flüssigkeit 43 z.B. Fluorverbindungen. Am aus dem Kanal 41 herausragenden Ende der Silatoren 42 sind diese mit einer sogenannten Kühlfäche 44 versehen, die volumenmäßig mit dem Silatoreninneren verbunden ist. In einem heißen Abgasstrahl kommt es so zu einer Verdampfung der Flüssigkeit, die an den Kühlflächen 44 wieder kondensiert. Auf diese Weise wird die Temperaturbelastung der Silatoren in erträglichen Grenzen gehalten.5 protrude the silators into the exhaust gas or flow channel. In order to protect the silators 42 against the heat occurring, there is a high-boiling liquid 43, for example fluorine compounds, in the interior thereof. At the end of the silators 42 protruding from the channel 41, they are provided with a so-called cooling surface 44, which is connected in volume to the interior of the silator. In a hot exhaust gas jet, the liquid evaporates and condenses again on the cooling surfaces 44. In this way, the temperature load on the silators is kept within tolerable limits.

Die Fig. 6 schließlich zeigt ein Ausführungsbeispiel mit gedämpften Silatoren 51. Bei diesen befindet sich, vorzugsweise im Bereich des Abgasstrahles, ein Dämpfungsbelag oder Antidröhnmittel 52, das durch ein Konturblech 53 abgedeckt ist. Um die mitschwingende Masse der Silatoren 51 nicht zu vergrößern, befindet sich diese Belegung vorzugsweise im Randbereich der Silatoren 51. Durch diese Bedämpfung der Silatoren absorbieren diese aufgrund ihrer Resistenz ebenfalls den Schall.Finally, FIG. 6 shows an exemplary embodiment with damped silators 51. These have, preferably in the region of the exhaust gas jet, a damping coating or anti-drumming agent 52, which is covered by a contour plate 53. In order not to increase the resonating mass of the silators 51, this assignment is preferably located in the edge region of the silators 51. Due to this damping of the silators, they also absorb the sound due to their resistance.

Claims (5)

1. Einrichtung zur Reduzierung des Auspuff- bzw. Abgaslärmes von Verbrennungsmotoren, thermodynamischen Anlagen etc. mittels Silatoren, dadurchgekennzeichnet , daß an oder in dem Abgas- oder Auspuffkanal (1) mehrere auf verschiedene Frequenzen abgestimmte Silatoren (2) integriert sind, wobei deren Impedanz kleiner als die Luftimpedanz ist und diese Silätoren durch eine Schutzschicht (3) - wie perforiertes Blech, Metallwolle oder Ähnliches - vom heißen und aggressiven Abgasstrahl geschützt sind.1. Device for reducing the exhaust or exhaust noise of internal combustion engines, thermodynamic systems, etc. by means of silators, characterized in that on or in the exhaust or exhaust duct (1) several silators (2) tuned to different frequencies are integrated, their impedance is smaller than the air impedance and these silators are protected from the hot and aggressive exhaust gas jet by a protective layer (3) - such as perforated sheet metal, metal wool or the like. 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet , daß am Ende des Abgaskanals (1) Silatoren (2) mit einer Impedanz kleiner und weiter stromaufwärts solche mit ungefähr gleicher Impedanz wie die Luftimpedanz ist, angeordnet sind.2. Device according to claim 1, characterized in that at the end of the exhaust duct (1) silators (2) with an impedance smaller and further upstream those with approximately the same impedance as the air impedance are arranged. 3. Einrichtung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet , daß der Abgaskanal (21) divergent ausgebildet wird und der Unterdrucksog in ihm zum Ansaugen von kühlluft für die Silatoren (22) verwendet wird.3. Device according to claims 1 and 2, characterized in that the exhaust duct (21) is designed to be divergent and the vacuum suction is used in it for sucking in cooling air for the silators (22). 4. Einrichtung nach den Ansprüchen 1 bis 3, dadurch gekennzeichnet , daß sich im Innern der Silatoren (2, 42 usw.) eine hochsiedende Flüssigkeit (43) und am oberen Ende eine Kühlfläche (44) befindet.4. Device according to claims 1 to 3, characterized in that in the interior of the silators (2, 42, etc.) there is a high-boiling liquid (43) and at the upper end a cooling surface (44). 5. Einrichtung nach den Ansprüchen 1 bis 4, dadurch gekennzeichnet , daß die Silatoren (2, 51) ganz oder am Rande mit einem Antidröhnbelag (52) versehen sind.5. Device according to claims 1 to 4, characterized in that the silators (2, 51) are provided entirely or at the edge with an anti-drumming coating (52).
EP80106431A 1979-11-23 1980-10-22 Device for reducing the noise of exhaust or of waste gas Expired EP0029506B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2947256A DE2947256C2 (en) 1979-11-23 1979-11-23 Device for reducing exhaust or exhaust noise
DE2947256 1979-11-23

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EP0029506A1 true EP0029506A1 (en) 1981-06-03
EP0029506B1 EP0029506B1 (en) 1983-09-07

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US (1) US4325458A (en)
EP (1) EP0029506B1 (en)
JP (1) JPS5685512A (en)
DE (1) DE2947256C2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5129793A (en) * 1990-10-24 1992-07-14 Copeland Corporation Suction muffler
US5267321A (en) * 1991-11-19 1993-11-30 Edwin Langberg Active sound absorber
US5341654A (en) * 1993-04-16 1994-08-30 Copeland Corporation Suction gas conduit
DE10102040A1 (en) * 2001-01-18 2002-07-25 Mahle Filtersysteme Gmbh Silencer, for a motor exhaust or turbo charger air intake, has a hollow body at the component to be suppressed containing a number of parallel Helmholtz resonators

Citations (7)

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US2904125A (en) * 1953-05-08 1959-09-15 Emhart Mfg Co Straight through silencer
BE667523A (en) * 1964-07-28 1965-11-16
DE2504132A1 (en) * 1974-02-01 1975-08-14 Brunswick Corp DEVICE FOR ATTENUATING THE SOUND LEVEL
DE2433795A1 (en) * 1974-07-13 1976-01-15 Messerschmitt Boelkow Blohm Noise-screening double or multi-skinned hollow wall - with intervening spaces filled with low elasticity-constant pressure absorber
FR2288858A1 (en) * 1974-10-24 1976-05-21 Plessy Fernand Silencer for IC engine - has perforated straight through pipe in compartmented cylindrical body
FR2321590A2 (en) * 1975-08-22 1977-03-18 Plessy Fernand Exhaust silencer with interconnecting damping chambers - has exhaust pipe passing through bottom and communicating via orifices with chambers
DE2834823B1 (en) * 1978-08-09 1979-10-25 Messerschmitt Boelkow Blohm Volume changing resonators based on the plate spring principle

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JPS4937651U (en) * 1972-07-11 1974-04-03
DE7330817U (en) * 1973-07-13 1975-06-05 Bbc Ag Brown Boveri & Cie Absorption silencer
CH581261A5 (en) * 1974-08-15 1976-10-29 Bernard Robert IC engine exhaust gas silencer - with gases passing through two concentric insulated chambers and entering Venturi at throat
US4104426A (en) * 1975-11-28 1978-08-01 Mcdonnell Douglas Corporation Production of muffler material
DE2632290C3 (en) * 1976-07-17 1980-02-14 Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen Sound reduction through resonating resonators
US4228869A (en) * 1976-07-17 1980-10-21 Messerschmitt-Bolkow-Blohm Gmbh Variable volume resonators using the Belleville spring principle

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2904125A (en) * 1953-05-08 1959-09-15 Emhart Mfg Co Straight through silencer
BE667523A (en) * 1964-07-28 1965-11-16
DE2504132A1 (en) * 1974-02-01 1975-08-14 Brunswick Corp DEVICE FOR ATTENUATING THE SOUND LEVEL
FR2260059A1 (en) * 1974-02-01 1975-08-29 Brunswick Corp
DE2433795A1 (en) * 1974-07-13 1976-01-15 Messerschmitt Boelkow Blohm Noise-screening double or multi-skinned hollow wall - with intervening spaces filled with low elasticity-constant pressure absorber
FR2288858A1 (en) * 1974-10-24 1976-05-21 Plessy Fernand Silencer for IC engine - has perforated straight through pipe in compartmented cylindrical body
FR2321590A2 (en) * 1975-08-22 1977-03-18 Plessy Fernand Exhaust silencer with interconnecting damping chambers - has exhaust pipe passing through bottom and communicating via orifices with chambers
DE2834823B1 (en) * 1978-08-09 1979-10-25 Messerschmitt Boelkow Blohm Volume changing resonators based on the plate spring principle

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Publication number Publication date
EP0029506B1 (en) 1983-09-07
DE2947256C2 (en) 1984-09-13
JPS5685512A (en) 1981-07-11
US4325458A (en) 1982-04-20
DE2947256A1 (en) 1981-05-27
JPH0152563B2 (en) 1989-11-09

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