EP0680031B1 - Acoustic damping element - Google Patents
Acoustic damping element Download PDFInfo
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- EP0680031B1 EP0680031B1 EP94117818A EP94117818A EP0680031B1 EP 0680031 B1 EP0680031 B1 EP 0680031B1 EP 94117818 A EP94117818 A EP 94117818A EP 94117818 A EP94117818 A EP 94117818A EP 0680031 B1 EP0680031 B1 EP 0680031B1
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- EP
- European Patent Office
- Prior art keywords
- airborne
- perforated plate
- resonators
- moulded part
- sound
- 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.)
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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 invention relates to an air silencer, comprising a plate-shaped Molded part made of polymer material with at least two chambers, which act as resonators formed with mutually different resonance frequencies are, the resonators the entire molded part substantially flat cover up.
- Such a molded part is known from DE 40 11 705 C2.
- the known one Air silencer comprises an airborne sound-absorbing part that is on its surface facing the sound source is covered with a porous layer or consists of open-cell foam.
- the resonators of the known Molded parts are designed as Helmholtz resonators, each Helmholtz resonator with only one on the side facing the sound source Breakthrough is provided.
- the invention has for its object an air silencer of the known Art to develop in such a way that a broadband sound absorption is made possible and that the air silencer in damp and / or Clean air rooms can be used.
- the molded part consists of a closed cell material that the resonators through essentially pot-shaped protrusions open towards the sound source are formed that the molded part facing the sound source Side is covered by a perforated plate in the area of each chamber is provided with at least two openings and that the molded part and the perforated plate are separably connected.
- Air silencers can because of its design and good properties can be used in clean air rooms since it does not Material particles from the molded part and / or from the perforated plate to the room air releases and does not absorb moisture. Colonization with bacteria is reliably prevented.
- the releasable connection of the molding from the perforated plate for example by a clamping system, enables easy cleaning of the entire air silencer.
- the sound hitting the air silencer first penetrates through the Openings in the perforated plate and stimulate the chamber floor and the side walls of each chamber on bending vibrations. Part of the energy is converted into heat by the internal friction of the molded part material. The remaining part of the energy is generated by the vibrating plugs of air dampened in the perforations of the perforated plate.
- a chamber of the molded part, which is covered with a multi-perforated perforated plate is therefore enables a comparatively broadband attenuation of impinging Airborne sound. Swing within the perforations in the perforated plate for example air plugs with differing volumes.
- the Molding consists of a closed-cell foam and the Perforated plate is formed by a perforated plate made of metallic material.
- the advantage here is that the air silencer does not absorb moisture and can therefore be used in wet or clean air rooms. Of the Air silencer is therefore in the food processing industry and medical fields.
- the production of a molded part from a closed-cell foam and a perforated metal sheet Material is advantageous in terms of manufacturing technology and economy.
- the molded part can be the same as resonators of the same design Be provided volume, the perforated plate in the region of the bulge in each case a different number and / or shape of openings having.
- the chambers With an air silencer designed in this way the chambers have a corresponding bending stiffness. Broadband absorption Airborne sound is achieved through the design of the perforated plate.
- the volume of the air plugs within the openings is different from one another deviating.
- the molded part is formed with resonators of differing volume and the Perforated plate in the area of the protrusions each a matching or has a different number and / or shape of openings. It exists the possibility of providing an evenly perforated perforated plate that covers the molded part, which has a different shape with resonators is provided. Due to the different designs of the resonators they can have a different bending stiffness, so that in a frequency range from 250 to 4000 Hz a good broadband Sound absorption is given.
- the resonators can be designed in this way be that the chamber floor is relatively swingable to the side walls the chamber is arranged.
- the transition area from the side walls to the chamber floor can be designed as a spring element, the spring element starting from the side walls and the chamber bottom one reduced, continuously merging, membrane-like thin material thickness having.
- the spring element can roll bellows be trained.
- Appropriately designed chambers form a spring-mass system, where the spring is trapped by the one inside the chamber Air and formed by the resilient spring element is that in the transition area between the side walls of the chamber and the chamber floor is arranged. The mass is due to the relatively oscillatable Chamber floor formed.
- the chamber floor resilient the side walls of the chamber are coupled can improve the Sound absorption can be effected in lower frequency ranges.
- the spring element is preferred is designed like a bellows, causes an oscillating relative movement the chamber floor to the side walls of the chamber only a slight mechanical Flexing stress, in terms of a good service life of the air silencer is of particular advantage.
- the proportion from the sum of the areas of all Openings in the perforated plate is 0.05 to 0.45.
- the relationship from the volume of each resonator and the corresponding area of the Openings are preferably 20 to 25. With such a configuration it is advantageous that excellent broadband sound absorption with good mechanical dimensional stability of the entire air silencer given is.
- the openings are limited in a circle and have a maximum diameter of 4 mm.
- the openings preferably have a diameter from 1 to 3 mm, the resonators being designed differently from one another are. If the diameter of the openings is less than 4 mm, advantageous that impurities inside the chambers on small particles are limited.
- the resonators have a cross section widened conically in the direction of the perforated plate. Following its shape, the molded part can be tapered Design of the resonators can be demoulded particularly easily. Through the essentially conical chambers is the drainage of moisture always guaranteed so that no moisture residues, for example, from cleaning the air silencer, within the Resonators remain. The moisture deposits are caused by the Openings in the perforated plate are discharged to the outside. Another enlarged Frequency range for the absorption of airborne sound can be brought about by that the molding on the side facing away from the perforated plate only partially is provided with a heavy layer. The ones with a heavy layer Resonators comparatively improve airborne sound absorption lower frequency vibrations.
- the air silencer can be used as ceiling and / or wall cladding Wet and / or clean air rooms are used.
- FIGS. 1 to 4 Several exemplary embodiments of air silencers are shown in FIGS. 1 to 4 shown and are described in more detail below.
- Fig. 1 is designed as a sound absorbing air silencer Cross section shown.
- FIG. 2 shows a top view of the air silencer from FIG. 1.
- Fig. 3 is a section of an air silencer consisting of several Sound absorption elements shown, the sound absorption elements as Ceiling cladding are formed.
- FIG. 4 shows a section, similar to the section from FIG. 3, wherein different air silencers and a different fastening device apply.
- FIG. 1 an embodiment of an air silencer is shown, which in essentially of a plate-shaped molded part 1 and a perforated plate 8 consists.
- the molded part 1 is made of a closed-cell polymeric material manufactured and includes a plurality of chambers 2,3, which act as resonators 4, 5 are formed.
- the resonators 4, 5 differing volumes and thus differing volumes Resonance frequencies.
- the resonators 4, 5 are in the direction the sound source 6 open and covered by the perforated plate 8.
- the perforated plate 8 is in the area of each bulge 7 with a large number of openings 9, 10 provided in connection with the resonators 4, 5 a good Sound absorption in a frequency range of at least 250 to 4000 Hz cause.
- the molded part 1 and the perforated plate 8 are by a bracket-shaped Fastening device 12 is separably connected to one another.
- the perforated plate is made of a metallic material and under elastic prestress the molding is created.
- the perforated plate is in the production-related condition dome-shaped like the resonators. During assembly the perforated plate 8 becomes elastic in a flat state transferred and thereby tightly connected to the molded part 1.
- FIG. 2 shows a top view of the air silencer from FIG. 1. It it can be seen that the resonators 4, 5 are formed differently from one another are.
- Fig. 3 is a section of at least two plate-shaped air silencers shown in the area of their circumferential limits the bracket-shaped fastening device 12 are connected to one another.
- the bracket-shaped fastening device 12 also connects the plate-shaped parts 1 with the adjacent perforated plates 8.
- Die Resonators 4, 5 are designed differently from one another.
- the resonator 4 is closed by a perforated plate 8, the openings 9, 10 from each other deviating shape is permeated.
- the diameter of the openings 9, 10 are 1 to 3 mm.
- the resonator 5 covered by a perforated plate 8, which has a plurality of identically formed Breakthroughs 9, 10 has.
- the resonator 5 is a spring-mass system formed, the side walls 13 of the chamber 3 by one piece formed with the resonator 5, bellows-type spring element 14 is connected to the chamber bottom 15.
- the one facing the sound source In this case, the surface of the perforated plates has a hole percentage of 25% on. On the one hand, this means good sound absorption in a wide frequency range conditional and on the other hand a sufficiently large stiffness of the entire air silencer.
- the resonator 4 shows an embodiment of one, similar to the embodiment from FIG. 3.
- the resonator 4 is on the side facing away from the sound source 6 Side with a heavy layer 11 for the absorption of low-frequency vibrations provided in the range up to 500 Hz.
- the resonator 5 is with one of the side walls 13 by a spring element 14 coupled chamber bottom 15 provided.
- the air silencers from Fig. 4 are as ceiling cladding provided and by a bracket-shaped fastening device an abutment 16 attached.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Duct Arrangements (AREA)
- Building Environments (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
- Exhaust Silencers (AREA)
Description
Die Erfindung betrifft einen Luftschalldämpfer, umfassend ein plattenförmiges Formteil aus polymerem Werkstoff mit zumindest zwei Kammern, die als Resonatoren mit voneinander abweichenden Resonanzfrequenzen ausgebildet sind, wobei die Resonatoren das gesamte Formteil im wesentlichen flächig überdecken.The invention relates to an air silencer, comprising a plate-shaped Molded part made of polymer material with at least two chambers, which act as resonators formed with mutually different resonance frequencies are, the resonators the entire molded part substantially flat cover up.
Ein solches Formteil ist aus der DE 40 11 705 C2 bekannt. Der vorbekannte Luftschalldämpfer umfaßt ein luftschallabsorbierendes Formteil, das auf seiner zur Schallquelle gerichteten Oberfläche mit einer porösen Schicht bedeckt ist oder aus offenporigem Schaumstoff besteht. Die Resonatoren des vorbekannten Formteils sind als Helmholtz-Resonatoren ausgebildet, wobei jeder Helmholtz-Resonator auf der der Schallquelle zugewandten Seite mit nur einer Durchbrechung versehen ist.Such a molded part is known from DE 40 11 705 C2. The known one Air silencer comprises an airborne sound-absorbing part that is on its surface facing the sound source is covered with a porous layer or consists of open-cell foam. The resonators of the known Molded parts are designed as Helmholtz resonators, each Helmholtz resonator with only one on the side facing the sound source Breakthrough is provided.
Der Erfindung liegt die Aufgabe zugrunde, einen Luftschalldämpfer der vorbekannten Art derart weiterzuentwickeln, daß eine breitbandigere Schallabsorption ermöglicht wird und daß der Luftschalldämpfer in Feucht - und/oder Reinlufträumen zur Anwendung gelangen kann.The invention has for its object an air silencer of the known Art to develop in such a way that a broadband sound absorption is made possible and that the air silencer in damp and / or Clean air rooms can be used.
Diese Aufgabe wird erfindungsgemäß mit den kennzeichnenden Merkmalen
von Anspruch 1 gelöst. Auf vorteilhafte Ausgestaltungen nehmen die Unteransprüche
Bezug.This object is achieved with the characterizing features
solved by
Im Rahmen der vorliegenden Erfindung ist es vorgesehen, daß das Formteil aus einem geschlossenzelligen Werkstoff besteht, daß die Resonatoren durch im wesentlichen topfförmige, in Richtung der Schallquelle offene Vorwölbungen gebildet sind, daß das Formteil auf der der Schallquelle zugewandten Seite von einer Lochplatte überdeckt ist, die im Bereich einer jeden Kammer mit zumindest zwei Durchbrechungen versehen ist und daß das Formteil und die Lochplatte trennbar miteinander verbunden sind. Der erfindungsgemäße Luftschalldämpfer kann aufgrund seiner Ausgestaltung und seiner guten Gebrauchseigenschaften in Reinlufträumen verwendet werden, da er keine Werkstoffpartikel vom Formteil und/oder von der Lochplatte an die Raumluft abgibt und keine Feuchtigkeit in sich aufnimmt. Die Besiedlung mit Bakterien wird dadurch zuverlässig verhindert. Die lösbare Verbindung des Formteils von der Lochplatte, beispielsweise durch ein Klemmsystem, ermöglicht die problemlose Reinigung des gesamten Luftschalldämpfers.In the context of the present invention it is provided that the molded part consists of a closed cell material that the resonators through essentially pot-shaped protrusions open towards the sound source are formed that the molded part facing the sound source Side is covered by a perforated plate in the area of each chamber is provided with at least two openings and that the molded part and the perforated plate are separably connected. The invention Air silencers can because of its design and good properties can be used in clean air rooms since it does not Material particles from the molded part and / or from the perforated plate to the room air releases and does not absorb moisture. Colonization with bacteria is reliably prevented. The releasable connection of the molding from the perforated plate, for example by a clamping system, enables easy cleaning of the entire air silencer.
Im Vergleich zu Helmholtz-Resonatoren, die auf der der Schallquelle zugewandten Seite des Formteils Resonatoren mit nur einer Durchbrechung aufweisen, ist mit dem beanspruchten Luftschalldämpfer eine wesentlich breitbandigere Schallabsorption gewährleistet. Der Anteil der Durchbrechungen ist zu dem Kammervolumen der entsprechenden Resonatoren derart abgestimmt, daß sich eine gute Schallabsorption in einem Frequenzbereich von zumindest 250 bis 4000 Hz ergibt. Als Helmholtz-Resonator ausgebildete Luftschalldämpfer können demgegenüber nur in einem Frequenzbereich von 750 bis 1500 Hz zufriedenstellend absorbieren.Compared to Helmholtz resonators that face the sound source Side of the molded part have resonators with only one opening, is a much broader band with the claimed air silencer Sound absorption guaranteed. The percentage of breakthroughs is matched to the chamber volume of the corresponding resonators in such a way that there is good sound absorption in a frequency range of at least 250 to 4000 Hz results. Air muffler designed as a Helmholtz resonator In contrast, can only in a frequency range from 750 to Absorb 1500 Hz satisfactorily.
Der auf den Luftschalldämpfer auftreffende Schall dringt zunächst durch die Durchbrechungen in der Lochplatte und regt den Kammerboden und die Seitenwände einer jeden Kammer zu Biegeschwingungen an. Ein Teil der Energie wird durch die innere Reibung des Formteil-Werkstoffs in Wärme umgewandelt. Der verbleibende Teil der Energie wird durch die schwingenden Luftpfropfen in den Durchbrechungen der Lochplatte gedämpft. Bereits eine Kammer des Formteils, die mit einer mehrfach perforierten Lochplatte abgedeckt ist, ermöglicht daher eine vergleichsweise breitbandige Dämpfung von auftreffendem Luftschall. Innerhalb der Durchbrechungen der Lochplatte schwingen beispielsweise Luftpfropfen mit voneinander abweichenden Volumina.The sound hitting the air silencer first penetrates through the Openings in the perforated plate and stimulate the chamber floor and the side walls of each chamber on bending vibrations. Part of the energy is converted into heat by the internal friction of the molded part material. The remaining part of the energy is generated by the vibrating plugs of air dampened in the perforations of the perforated plate. Already a chamber of the molded part, which is covered with a multi-perforated perforated plate is therefore enables a comparatively broadband attenuation of impinging Airborne sound. Swing within the perforations in the perforated plate for example air plugs with differing volumes.
Gemäß einer vorteilhaften Ausgestaltung kann es vorgesehen sein, daß das Formteil aus einem geschlossenzelligen Schaumstoff besteht und die Lochplatte durch ein Lochblech aus metallischem Werkstoff gebildet ist. Hierbei ist von Vorteil, daß der Luftschalldämpfer keine Feuchtigkeit aufnimmt und daher in Naß- oder Reinlufträumen Anwendung finden kann. Der Luftschalldämpfer ist daher in der lebensmittelverarbeitenden Industrie und medizinischen Bereichen einsetzbar. Die Herstellung eines Formteils aus einem geschlossenzelligen Schaumstoff und einem Lochblech aus metallischen Werkstoff ist in fertigungstechnischer und wirtschaftlicher Hinsicht vorteilhaft.According to an advantageous embodiment, it can be provided that the Molding consists of a closed-cell foam and the Perforated plate is formed by a perforated plate made of metallic material. The advantage here is that the air silencer does not absorb moisture and can therefore be used in wet or clean air rooms. Of the Air silencer is therefore in the food processing industry and medical fields. The production of a molded part from a closed-cell foam and a perforated metal sheet Material is advantageous in terms of manufacturing technology and economy.
Das Formteil kann mit übereinstimmend ausgebildeten Resonatoren gleichen Volumens versehen sein, wobei die Lochplatte im Bereich der Vorwölbung jeweils eine voneinander abweichende Anzahl und/oder Gestalt von Durchbrechungen aufweist. Bei einem derart ausgebildeten Luftschalldämpfer weisen die Kammern eine übereinstimmende Biegesteifigkeit auf. Die breitbandige Absorption von Luftschall wird durch die Ausgestaltung der Lochplatte erzielt. Das Volumen der Luftpfropfen innerhalb der Durchbrechungen ist voneinander abweichend.The molded part can be the same as resonators of the same design Be provided volume, the perforated plate in the region of the bulge in each case a different number and / or shape of openings having. With an air silencer designed in this way the chambers have a corresponding bending stiffness. Broadband absorption Airborne sound is achieved through the design of the perforated plate. The volume of the air plugs within the openings is different from one another deviating.
Nach einer anderen Ausgestaltung kann es vorgesehen sein, daß das Formteil mit Resonatoren voneinander abweichenden Volumens ausgebildet ist und die Lochplatte im Bereich der Vorwölbungen jeweils eine übereinstimmende oder abweichende Anzahl und/oder Gestalt von Durchbrechungen aufweist. Es besteht die Möglichkeit, eine gleichmäßig perforierte Lochplatte vorzusehen, die das Formteil überdeckt, das mit Resonatoren voneinander abweichender Gestalt versehen ist. Durch die unterschiedlichen Ausgestaltungen der Resonatoren können diese eine voneinander abweichende Biegesteifigkeit aufweisen, so daß in einem Frequenzbereich von 250 bis 4000 Hz eine gute breitbandige Schallabsorption gegeben ist. According to another embodiment, it can be provided that the molded part is formed with resonators of differing volume and the Perforated plate in the area of the protrusions each a matching or has a different number and / or shape of openings. It exists the possibility of providing an evenly perforated perforated plate that covers the molded part, which has a different shape with resonators is provided. Due to the different designs of the resonators they can have a different bending stiffness, so that in a frequency range from 250 to 4000 Hz a good broadband Sound absorption is given.
Die Resonatoren können gemäß einer vorteilhaften Ausgestaltung derart ausgebildet sein, daß der Kammerboden relativ schwingfähig zu den Seitenwänden der Kammer angeordnet ist. Der Übergangsbereich von den Seitenwänden zum Kammerboden kann als Federelement ausgebildet sein, wobei das Federelement ausgehend von den Seitenwandungen und dem Kammerboden eine verringerte, stufenlos ineinander übergehende, membranartig dünne Materialstärke aufweist. Um eine gute Beweglichkeit des Kammerbodens relativ zu den Seitenwänden der Kammer zu bewirken, kann das Federelement rollbalgartig ausgebildet sein. Entsprechend ausgebildete Kammern bilden ein Feder-Masse-System, bei dem die Feder durch die innerhalb der Kammer eingeschlossene Luft und durch das elastisch nachgiebige Federelement gebildet ist, das im Übergangsbereich zwischen den Seitenwänden der Kammer und dem Kammerboden angeordnet ist. Die Masse ist durch den relativ schwingfähigen Kammerboden gebildet. Dadurch, daß der Kammerboden elastisch an die Seitenwände der Kammer angekoppelt ist, kann eine Verbesserung der Schallabsorption in tieferen Frequenzbereichen bewirkt werden. Durch eine derartige Konstruktion ist eine Schallabsorption in einem Frequenzbereich zwischen 100 und 4000 Hz möglich. Dadurch, daß das Federelement bevorzugt rollbalgartig ausgebildet ist, bewirkt eine schwingende Relativbewegung des Kammerbodens zu den Seitenwänden der Kammer nur eine geringe mechanische Walkbeanspruchung, was im Hinblick auf eine gute Gebrauchsdauer des Luftschalldämpfers von hervorzuhebendem Vorteil ist.According to an advantageous embodiment, the resonators can be designed in this way be that the chamber floor is relatively swingable to the side walls the chamber is arranged. The transition area from the side walls to the chamber floor can be designed as a spring element, the spring element starting from the side walls and the chamber bottom one reduced, continuously merging, membrane-like thin material thickness having. To be able to move the chamber floor relatively well to cause the side walls of the chamber, the spring element can roll bellows be trained. Appropriately designed chambers form a spring-mass system, where the spring is trapped by the one inside the chamber Air and formed by the resilient spring element is that in the transition area between the side walls of the chamber and the chamber floor is arranged. The mass is due to the relatively oscillatable Chamber floor formed. The fact that the chamber floor resilient the side walls of the chamber are coupled, can improve the Sound absorption can be effected in lower frequency ranges. By a such construction is sound absorption in a frequency range between 100 and 4000 Hz possible. In that the spring element is preferred is designed like a bellows, causes an oscillating relative movement the chamber floor to the side walls of the chamber only a slight mechanical Flexing stress, in terms of a good service life of the air silencer is of particular advantage.
Hinsichtlich guter Gebrauchseigenschaften des Luftschalldämpfers hat es sich als vorteilhaft bewährt, wenn der Anteil aus der Summe der Flächen aller Durchbrechungen in der Lochplatte 0,05 bis 0,45 beträgt. Das Verhältnis aus dem Volumen eines jeden Resonators und der entsprechenden Fläche der Durchbrechungen beträgt bevorzugt 20 bis 25. Bei einer derartigen Ausgestaltung ist es von Vorteil, daß eine ausgezeichnete breitbandige Schallabsorption bei einer guten mechanischen Formbeständigkeit des gesamten Luftschalldämpfers gegeben ist. With regard to the good performance properties of the air silencer, it has proven to be advantageous if the proportion from the sum of the areas of all Openings in the perforated plate is 0.05 to 0.45. The relationship from the volume of each resonator and the corresponding area of the Openings are preferably 20 to 25. With such a configuration it is advantageous that excellent broadband sound absorption with good mechanical dimensional stability of the entire air silencer given is.
Nach einer vorteilhaften Ausgestaltung ist es vorgesehen, daß die Durchbrechungen kreisförmig begrenzt sind und einen Durchmesser von höchstens 4 mm aufweisen. Bevorzugt weisen die Durchbrechungen einen Durchmesser von 1 bis 3 mm auf, wobei die Resonatoren voneinander abweichend gestaltet sind. Beträgt der Durchmesser der Durchbrechungen weniger als 4 mm, ist von Vorteil, daß Verunreinigungen innerhalb der Kammern auf kleine Partikel begrenzt sind.According to an advantageous embodiment, it is provided that the openings are limited in a circle and have a maximum diameter of 4 mm. The openings preferably have a diameter from 1 to 3 mm, the resonators being designed differently from one another are. If the diameter of the openings is less than 4 mm, advantageous that impurities inside the chambers on small particles are limited.
Hinsichtlich einer problemlosen Herstellbarkeit des Formteils und einer einfachen Reinigung, hat es sich als vorteilhaft bewährt, wenn die Resonatoren einen in Richtung der Lochplatte kegelig erweiterten Querschnitt aufweisen. Im Anschluß an seine Formgebung kann das Formteil durch die kegelige Ausgestaltung der Resonatoren besonders einfach entformt werden. Durch die im wesentlichen konischen Kammern ist das Ablaufen von Feuchtigkeitsniederschlägen immer gewährleistet, so daß keine Feuchtigkeitsrückstände, beispielsweise von der Reinigung des Luftschalldämpfers, innerhalb der Resonatoren verbleiben. Die Feuchtigkeitsniederschläge werden durch die Durchbrechungen der Lochplatte nach außen abgeführt. Ein weiter vergrößerter Frequenzbereich zur Absorption von Luftschall kann dadurch bewirkt werden, daß das Formteil auf der der Lochplatte abgewandten Seite nur teilweise mit einer Schwerschicht versehen ist. Die mit einer Schwerschicht versehenen Resonatoren bewirken eine verbesserte Luftschallabsorption vergleichsweise tieferfrequenter Schwingungen.With regard to easy manufacture of the molded part and simple Cleaning, it has proven to be beneficial if the resonators have a cross section widened conically in the direction of the perforated plate. Following its shape, the molded part can be tapered Design of the resonators can be demoulded particularly easily. Through the essentially conical chambers is the drainage of moisture always guaranteed so that no moisture residues, for example, from cleaning the air silencer, within the Resonators remain. The moisture deposits are caused by the Openings in the perforated plate are discharged to the outside. Another enlarged Frequency range for the absorption of airborne sound can be brought about by that the molding on the side facing away from the perforated plate only partially is provided with a heavy layer. The ones with a heavy layer Resonators comparatively improve airborne sound absorption lower frequency vibrations.
Der Luftschalldämpfer kann als Decken- und/oder Wandverkleidungen in Feucht- und/oder Reinlufträumen zur Anwendung gelangen.The air silencer can be used as ceiling and / or wall cladding Wet and / or clean air rooms are used.
Mehrere Ausführungsbeispiele von Luftschalldämpfern sind in den Fig. 1 bis 4 gezeigt und werden im folgenden näher beschrieben. Several exemplary embodiments of air silencers are shown in FIGS. 1 to 4 shown and are described in more detail below.
In Fig. 1 ist ein als Schallschluckelement ausgebildeter Luftschalldämpfer im Querschnitt gezeigt.In Fig. 1 is designed as a sound absorbing air silencer Cross section shown.
In Fig. 2 ist eine Draufsicht auf den Luftschalldämpfer aus Fig. 1 dargestellt.FIG. 2 shows a top view of the air silencer from FIG. 1.
In Fig. 3 ist ein Ausschnitt aus einem Luftschalldämpfer, bestehend aus mehreren Schallschluckelementen gezeigt, wobei die Schallschluckelemente als Deckenverkleidung ausgebildet sind.In Fig. 3 is a section of an air silencer consisting of several Sound absorption elements shown, the sound absorption elements as Ceiling cladding are formed.
In Fig. 4 ist ein Ausschnitt gezeigt, ähnlich dem Ausschnitt aus Fig. 3, wobei voneinander abweichende Luftschalldämpfer und eine abweichende Befestigungsvorrichtung zur Anwendung gelangen.4 shows a section, similar to the section from FIG. 3, wherein different air silencers and a different fastening device apply.
In Fig. 1 ist ein Ausführungsbeispiel eines Luftschalldämpfer gezeigt, der im
wesentlichen aus einem plattenförmigen Formteil 1 und einer Lochplatte 8
besteht. Das Formteil 1 ist aus einem geschlossenzelligen polymeren Werkstoff
hergestellt und umfaßt eine Vielzahl von Kammern 2,3, die als Resonatoren
4, 5 ausgebildet sind. In diesem Ausführungsbeispiel weisen die Resonatoren,
4, 5 voneinander abweichende Volumina und dadurch voneinander abweichende
Resonanzfrequenzen auf. Die Resonatoren 4, 5 sind in Richtung
der Schallquelle 6 offen und von der Lochplatte 8 überdeckt. Die Lochplatte 8
ist im Bereich einer jeden Vorwölbung 7 mit einer Vielzahl von Durchbrechungen
9, 10 versehen, um in Verbindung mit den Resonatoren 4, 5 eine gute
Schallabsorption in einem Frequenzbereich von zumindest 250 bis 4000 Hz zu
bewirken. Das Formteil 1 und die Lochplatte 8 sind durch eine klammerförmige
Befestigungsvorrichtung 12 trennbar miteinander verbunden. In den hier
dargestellten Ausführungsbeispielen ist es vorgesehen, daß die Lochplatte aus
einem metallischen Werkstoff besteht und unter elastischer Vorspannung an
das Formteil angelegt ist. Im herstellungsbedingten Zustand ist die Lochplatte
dazu ähnlich den Resonatoren kuppelförmig gewölbt. Während der Montage
wird die Lochplatte 8 unter elastischer Verformung in einen ebenen Zustand
überführt und dadurch dicht mit dem Formteil 1 verbunden. In Fig. 1 an embodiment of an air silencer is shown, which in
essentially of a plate-shaped molded
In Fig. 2 ist eine Draufsicht auf den Luftschalldämpfer aus Fig. 1 gezeigt. Es
ist zu erkennen, daß die Resonatoren 4, 5 voneinander abweichend ausgebildet
sind.FIG. 2 shows a top view of the air silencer from FIG. 1. It
it can be seen that the
In Fig. 3 ist ein Ausschnitt aus zumindest zwei plattenförmigen Luftschalldämpfern
gezeigt, die im Bereich ihrer umfangsseitigen Begrenzungen durch
die klammerförmige Befestigungsvorrichtung 12 miteinander verbunden sind.
Die klammerförmige Befestigungsvorrichtung 12 verbindet außerdem die
plattenförmigen Formteile 1 mit den jeweils angrenzenden Lochplatten 8. Die
Resonatoren 4, 5 sind voneinander abweichend gestaltet. Der Resonator 4 ist
von einer Lochplatte 8 verschlossen, die von Durchbrechungen 9, 10 voneinander
abweichender Gestalt durchdrungen ist. Die Durchmesser der Durchbrechungen
9, 10 betragen 1 bis 3 mm. Demgegenüber ist der Resonator 5
von einer Lochplatte 8 überdeckt, die eine Vielzahl von identisch ausgebildeten
Durchbrechungen 9, 10 aufweist. Der Resonator 5 ist als Feder-Masse-System
ausgebildet, wobei die Seitenwände 13 der Kammer 3 durch ein einstückig
mit dem Resonator 5 ausgebildetes, rollbalgartiges Federelement 14
mit dem Kammerboden 15 verbunden ist. Die zur Schallquelle gerichtete
Oberfläche der Lochplatten weist in diesem Falle einen Lochanteil von 25%
auf. Dadurch ist einerseits eine gute Schallabsorption in einem breiten Frequenzbereich
bedingt und andererseits eine ausreichend große Formsteifigkeit
des gesamten Luftschalldämpfers.In Fig. 3 is a section of at least two plate-shaped air silencers
shown in the area of their circumferential limits
the bracket-shaped
In Fig. 4 ist ein Ausführungsbeispiel eines gezeigt, ähnlich dem Ausführungsbeispiel
aus Fig. 3. Der Resonator 4 ist auf der der Schallquelle 6 abgewandten
Seite mit einer Schwerschicht 11 zur Absorption tieferfrequenter Schwingungen
im Bereich bis 500 Hz versehen. Der Resonator 5 ist mit einem von
den Seitenwänden 13 durch ein Federelement 14 gekoppelten Kammerboden
15 versehen. Das Verhältnis aus dem Volumen der Resonatoren 4, 5 und den
entsprechenden Flächen der Durchbrechungen 9, 10 beträgt in diesen Ausführungsbeispielen
22. Die Luftschalldämpfer aus Fig. 4 sind als Deckenverkleidung
vorgesehen und durch eine klammerförmige Befestigungsvorrichtung an
einem Widerlager 16 befestigt.4 shows an embodiment of one, similar to the embodiment
from FIG. 3. The
Claims (10)
- An airborne-sound silencer, comprising a plate-shaped moulded part made from polymer material and having at least two chambers which are constructed as resonators with mutually differing resonant frequencies, the resonators essentially covering the entire moulded part in two dimensions, characterized in that the moulded part (1) comprises a closed-cell material, in that the resonators (4, 5) are formed by essentially pot-shaped protrusions which are open towards the sound source (6), in that the moulded part (1) is covered on the side facing the sound source (6) by a perforated plate (8) which is provided with at least two cutouts (9, 10) in the region of each chamber (2, 3), and in that the moulded part (1) and the perforated plate (8) are separably connected to one another.
- An airborne-sound silencer according to claim 1, characterized in that the moulded part (1) comprises a foam, and the perforated plate (8) is formed by a perforated sheet made from metallic material.
- An airborne-sound silencer according to any of claims 1 to 2, characterized in that the moulded part (1) is provided with correspondingly constructed resonators (4, 5) of equal volume, and in that in the region of the protrusions (7) the perforated plate (8) in each case has a mutually differing number and/or shape of cutouts (9, 10).
- An airborne-sound silencer according to any of claims 1 to 2, characterized in that the moulded part (1) is constructed with resonators (4, 5) of mutually differing volume, and in that in the region of the protrusions (7) the perforated plate (8) in each case has a corresponding or differing number and/or shape of cutouts (9, 10).
- An airborne-sound silencer according to any of claims 1 to 4, characterized in that the proportion of the sum of the areas of all the cutouts (9, 10) in the perforated plate (8) is 0.05 to 0.45.
- An airborne-sound silencer according to any of claims 1 to 5, characterized in that the ratio of the volume of each resonator (4, 5) to the corresponding area of the cutouts (9, 10) is 10 to 30.
- An airborne-sound silencer according to any of claims 1 to 6, characterized in that the cutouts (9, 10) have circular boundaries and a diameter of at most 4 mm.
- An airborne-sound silencer according to any of claims 1 to 7, characterized in that the resonators (4, 5) have a conically widened cross section in the direction of the perforated plate (8).
- An airborne-sound silencer according to any of claims 1 to 8, characterized in that the moulded part (1) is provided with a heavy-duty coating (11) on the side averted from the perforated plate (8).
- An airborne-sound silencer according to any of claims 1 to 9, characterized by use as ceiling lining and/or wall lining.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4414566A DE4414566C2 (en) | 1994-04-27 | 1994-04-27 | Air silencer |
| DE4414566 | 1994-04-27 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0680031A2 EP0680031A2 (en) | 1995-11-02 |
| EP0680031A3 EP0680031A3 (en) | 1995-11-15 |
| EP0680031B1 true EP0680031B1 (en) | 1999-06-16 |
Family
ID=6516487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94117818A Expired - Lifetime EP0680031B1 (en) | 1994-04-27 | 1994-11-11 | Acoustic damping element |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5587564A (en) |
| EP (1) | EP0680031B1 (en) |
| JP (1) | JP2986711B2 (en) |
| DE (1) | DE4414566C2 (en) |
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| JP2815542B2 (en) * | 1994-08-31 | 1998-10-27 | 三菱電機ホーム機器株式会社 | Sound absorption mechanism using porous structure |
| JP2848587B2 (en) * | 1995-10-23 | 1999-01-20 | 株式会社神戸製鋼所 | Sound-absorbing damping material |
| GB9522724D0 (en) * | 1995-11-06 | 1996-01-10 | Acts Ltd | A noise attenuator for an induction system or an exhaust system |
| DE19620375A1 (en) * | 1996-05-21 | 1997-11-27 | Polymer Chemie Gmbh | Sound absorbing and damping component |
| TW345603B (en) * | 1996-05-29 | 1998-11-21 | Gmundner Fertigteile Gmbh | A noise control device for tracks |
| US6015026A (en) * | 1997-06-06 | 2000-01-18 | Owens-Corning Fiberglas Technology, Inc. | Acoustical diffuser assembly and method of installation |
| DE19804567C2 (en) * | 1998-02-05 | 2003-12-11 | Woco Franz Josef Wolf & Co Gmbh | Surface absorber for sound waves and use |
| DE29803675U1 (en) * | 1998-03-03 | 1999-07-15 | M. Faist GmbH & Co KG, 86381 Krumbach | Soundproofing shield |
| JP2000330571A (en) * | 1999-05-21 | 2000-11-30 | Nok Vibracoustic Kk | Sound absorbing structure |
| JP2001282249A (en) * | 2000-03-30 | 2001-10-12 | Nok Vibracoustic Kk | Sound absorbing material |
| JP2002029330A (en) * | 2000-07-18 | 2002-01-29 | Nok Vibracoustic Kk | Sound absorption structure |
| US7395898B2 (en) * | 2004-03-05 | 2008-07-08 | Rsm Technologies Limited | Sound attenuating structures |
| ATE428834T1 (en) * | 2004-06-17 | 2009-05-15 | Heimbach Gmbh & Co Kg | SOUND INSULATION DEVICE FOR A WALL, CEILING OR FLOOR COVERING |
| KR100571539B1 (en) * | 2004-06-30 | 2006-04-24 | 김배영 | Sound absorption block and method of constructing it |
| CA2611542C (en) * | 2006-04-27 | 2014-01-07 | Masao Suzuki | Sound insulating device |
| US7520370B2 (en) * | 2006-05-17 | 2009-04-21 | William Orlin Gudim | Combination acoustic diffuser and absorber and method of production thereof |
| JP5326472B2 (en) * | 2007-10-11 | 2013-10-30 | ヤマハ株式会社 | Sound absorption structure |
| EP2085962A2 (en) * | 2008-02-01 | 2009-08-05 | Yamaha Corporation | Sound absorbing structure and vehicle component having sound absorbing properties |
| US20090223738A1 (en) * | 2008-02-22 | 2009-09-10 | Yamaha Corporation | Sound absorbing structure and vehicle component having sound absorption property |
| JP5194972B2 (en) * | 2008-04-09 | 2013-05-08 | トヨタ紡織株式会社 | Soundproof material |
| JP5245641B2 (en) * | 2008-08-20 | 2013-07-24 | ヤマハ株式会社 | Sound absorbing structure |
| DE102009034463A1 (en) | 2009-07-22 | 2011-02-03 | Filtro Klimatechnik Gmbh | Airborne sound absorbing device, particularly for use in air conditioning units, comprises sound absorbing bodies arranged in air flow channel or housing, where cover is designed at end of front side of sound absorbing body |
| US8424637B2 (en) * | 2010-01-08 | 2013-04-23 | Richard L. Lenz, Jr. | Systems and methods for providing an asymmetric cellular acoustic diffuser |
| ITRA20100013A1 (en) * | 2010-05-04 | 2011-11-05 | Simone Meneghel | "FRANGI-ONDA SOUND INSULATION PANEL" |
| EP2691947A2 (en) * | 2011-03-29 | 2014-02-05 | Katholieke Universiteit Leuven | Vibro-acoustic attenuation or reduced energy transmission |
| CN103975385B (en) * | 2011-10-06 | 2018-04-10 | Hrl实验室有限责任公司 | High bandwidth anti-resonance vibration film |
| WO2013098384A1 (en) * | 2011-12-31 | 2013-07-04 | Saint-Gobain Performance Plastics Chaineux | Optimized pattern of a damping layer for wall, floor, and ceiling constructions |
| US8474574B1 (en) * | 2012-02-29 | 2013-07-02 | Inoac Corporation | Sound absorbing structure |
| US11021870B1 (en) * | 2013-03-14 | 2021-06-01 | Hrl Laboratories, Llc | Sound blocking enclosures with antiresonant membranes |
| JP6372004B2 (en) * | 2013-05-16 | 2018-08-15 | 株式会社トヨックス | Radiation element |
| US8869933B1 (en) | 2013-07-29 | 2014-10-28 | The Boeing Company | Acoustic barrier support structure |
| US8857563B1 (en) | 2013-07-29 | 2014-10-14 | The Boeing Company | Hybrid acoustic barrier and absorber |
| WO2016026424A1 (en) * | 2014-08-20 | 2016-02-25 | The Hong Kong University Of Science And Technology | Vibration damped sound shield |
| GB201415874D0 (en) * | 2014-09-08 | 2014-10-22 | Sonobex Ltd | Acoustic Attenuator |
| TWI625446B (en) * | 2015-06-18 | 2018-06-01 | 德克薩斯大學體系董事會 | Resonator, resonator array for damping acoustic energy from source in liquid and noise abatement system |
| US9630575B2 (en) * | 2015-09-30 | 2017-04-25 | GM Global Technology Operations LLC | Panel assembly with noise attenuation system |
| WO2018101164A1 (en) * | 2016-11-29 | 2018-06-07 | 富士フイルム株式会社 | Soundproofing structure |
| JP6636471B2 (en) * | 2017-02-16 | 2020-01-29 | 株式会社ニフコ | Sound absorber and sound absorbing structure |
| US10741159B2 (en) | 2017-09-10 | 2020-08-11 | Douglas Peter Magyari | Acoustic-absorber system and method |
| JP2019194743A (en) * | 2019-08-19 | 2019-11-07 | 株式会社リコー | Electrical apparatus |
| DE102019128209B4 (en) * | 2019-10-18 | 2023-02-02 | Daniel Mohr | Sound-absorbing device with knobbed foil composite and use |
| CA3164699A1 (en) | 2020-01-21 | 2021-07-29 | Mark WOCHNER | Simultaneously attenuating high-frequencies and amplifying low-frequencies of underwater sounds |
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| US2124463A (en) * | 1935-11-16 | 1938-07-19 | Woodall Industries Inc | Sound insulation |
| US2904125A (en) * | 1953-05-08 | 1959-09-15 | Emhart Mfg Co | Straight through silencer |
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| US3269484A (en) * | 1963-09-24 | 1966-08-30 | Lighter Stephen | Acoustic absorbing structure |
| DE2632290C3 (en) * | 1976-07-17 | 1980-02-14 | Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen | Sound reduction through resonating resonators |
| DE2921050A1 (en) * | 1979-05-23 | 1980-11-27 | Fraunhofer Ges Forschung | SOUND ABSORBING COMPONENT MADE OF PLASTIC FILM |
| US4242398A (en) * | 1979-01-16 | 1980-12-30 | Teijin Limited | Fibrous shaped article having non-level surface |
| DE3462833D1 (en) * | 1983-01-20 | 1987-04-30 | Illbruck Gmbh | Acoustic absorber plate |
| DE3643481A1 (en) * | 1986-05-14 | 1987-11-19 | Pape Hans | SOUND ABSORPTION COATING OF AN ACOUSTIC WALL OR ACOUSTIC CEILING |
| CH671848B (en) * | 1986-05-16 | 1989-09-29 | ||
| US4821841A (en) * | 1987-06-16 | 1989-04-18 | Bruce Woodward | Sound absorbing structures |
| FR2622333B1 (en) * | 1987-10-27 | 1990-01-26 | Thomson Csf | ANECHOICAL COATING FOR ACOUSTIC WAVES |
| DE8803634U1 (en) * | 1988-03-17 | 1988-04-28 | Gebrüder Trox, Gesellschaft mit beschränkter Haftung, 4133 Neukirchen-Vluyn | Silencers for flowing gases in ventilation and air conditioning systems |
| CH678201A5 (en) * | 1989-03-17 | 1991-08-15 | Lignoform Formsperrholz Ag | |
| DE4011705A1 (en) * | 1990-04-11 | 1991-10-17 | Freudenberg Carl Fa | AIR SOUND ABSORBING MOLDED PART |
-
1994
- 1994-04-27 DE DE4414566A patent/DE4414566C2/en not_active Expired - Fee Related
- 1994-11-11 EP EP94117818A patent/EP0680031B1/en not_active Expired - Lifetime
-
1995
- 1995-04-10 US US08/419,687 patent/US5587564A/en not_active Expired - Fee Related
- 1995-04-24 JP JP7098970A patent/JP2986711B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0680031A2 (en) | 1995-11-02 |
| EP0680031A3 (en) | 1995-11-15 |
| DE4414566A1 (en) | 1995-11-02 |
| JP2986711B2 (en) | 1999-12-06 |
| US5587564A (en) | 1996-12-24 |
| DE4414566C2 (en) | 1997-11-20 |
| JPH0844370A (en) | 1996-02-16 |
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