DE102020116396A1 - Sound absorber - Google Patents
Sound absorber Download PDFInfo
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- DE102020116396A1 DE102020116396A1 DE102020116396.7A DE102020116396A DE102020116396A1 DE 102020116396 A1 DE102020116396 A1 DE 102020116396A1 DE 102020116396 A DE102020116396 A DE 102020116396A DE 102020116396 A1 DE102020116396 A1 DE 102020116396A1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/02—Layered products comprising a layer of paper or cardboard next to a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/08—Corrugated paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
- B32B3/12—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a layer of regularly- arranged cells, e.g. a honeycomb structure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/02—Physical, chemical or physicochemical properties
- B32B7/022—Mechanical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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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
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
Abstract
Der erfindungsgemäße Schallabsorber (10) umfasst mindestens einen Resonator (11). Ein Spaltkanal (25) umgrenztes Volumen (13). Vorteilhafterweise wird dieser Tieffrequenzabsorber mit einem Hochfrequenzabsorber kombiniert, beispielsweise in Form einer oder mehrerer Wabenplatten, die über einen Abstandshalter mit dem Spaltkanalelement (12) verbunden sind. Die Anbringung dieses Mittel- und Hochfrequenzabsorber (30) an dem Spaltkanalelement (12) verbessert außerdem die Tieftonabsorption. Es wird insgesamt ein multifrequenter Schallabsorber erhalten, der insbesondere mittlere und tiefe Frequenzen dämpft.The sound absorber (10) according to the invention comprises at least one resonator (11). A gap channel (25) delimited volume (13). This low-frequency absorber is advantageously combined with a high-frequency absorber, for example in the form of one or more honeycomb panels, which are connected to the gap channel element (12) via a spacer. The attachment of this medium and high frequency absorber (30) to the gap channel element (12) also improves the low-frequency absorption. Overall, a multi-frequency sound absorber is obtained, which in particular attenuates medium and low frequencies.
Description
Die Erfindung betrifft einen Schallabsorber, der insbesondere zur Absorption tiefer Frequenzen geeignet ist.The invention relates to a sound absorber which is particularly suitable for absorbing low frequencies.
Tieffrequente Schallabsorber sind grundsätzlich bekannt, beispielsweise werden zur Schallabsorption Helmholtzresonatoren eingesetzt.Low-frequency sound absorbers are known in principle, for example Helmholtz resonators are used for sound absorption.
In dem Fachartikel „Simulated and Experimental Research of Multi-Band accoustic Metamaterial with a Single Resonant Structure“, Huaijun Chen und Changlin Ding, (Materials 2019, 12, 3469; doi:10.3390/ ma12213469) wird vorgeschlagen, innerhalb eines etwa kugelförmigen Helmholtzresonators einen weiteren Helmholtzresonator anzuordnen. Es können damit Dämpfungskurven mit mehreren Minima erzeugt werden. Bei einem weiteren in diesem Artikel angegebenen Ausführungsbeispiel sind drei kugelförmige Resonatoren ineinander geschachtelt.In the specialist article "Simulated and Experimental Research of Multi-Band Accoustic Metamaterial with a Single Resonant Structure", Huaijun Chen and Changlin Ding, (
In dem Fachartikel
Weiter ist aus dem Fachartikel „Ultrathin reflective acoustic metasurface based on the synergetic coupling of resonant cavity and labyrinthine beams“, S.K. Han, W. Zhang, G.J. Ma, C.W. Wu und Z. Chen, Modern Physics letters B 1850144 World scientific publishing company, doi: 10.1142/S0217984918501440 die Kopplung einer Schlitzstruktur an einen Resonator bekannt.Furthermore, from the specialist article "Ultrathin reflective acoustic metasurface based on the synergetic coupling of resonant cavity and labyrinthine beams", S.K. Han, W. Zhang, G.J. Ma, C.W. Wu and Z. Chen, Modern Physics letters B 1850144 World scientific publishing company, doi: 10.1142 / S0217984918501440 known the coupling of a slot structure to a resonator.
Außerdem sind schalldämpfende Wabenstrukturen beispielsweise aus der
Es ist Aufgabe der Erfindung, einen multifrequenten Schallabsorber zu schaffen, der insbesondere zu der Absorption bzw. Dämpfung tieffrequenten Schalls geeignet ist.It is the object of the invention to create a multi-frequency sound absorber which is particularly suitable for the absorption or attenuation of low-frequency sound.
Diese Aufgabe wird mit einem Schallabsorber nach Anspruch 1 gelöst:This object is achieved with a sound absorber according to claim 1:
Der erfindungsgemäße Schallabsorber weist einen Resonator mit einem in einem Gehäuse ausgebildeten Resonanzvolumen sowie mit einem Spaltkanalelement auf, das eine von mindestens einem Luftspalt durchsetzten Wand aufweist. Zwischen dem Resonator und dem Spaltkanalelement ist ein Volumen ausgebildet, das einerseits akustisch an das Spaltkanalelement und andererseits akustisch an die Schalleingangsöffnung des Resonators koppelt. Das insoweit beschriebene aus Resonator, Spaltkanalelement und dazwischen liegendem Volumen gebildete Grundelement baut flach und eignet sich dennoch zur Absorption tiefer Frequenzen. Der Resonator kann eine oder mehrere Resonanzfrequenzen aufweisen, die vorzugsweise allesamt im tiefen Frequenzbereich von beispielsweise unter 200 Hz liegen.The sound absorber according to the invention has a resonator with a resonance volume formed in a housing and with a gap channel element which has a wall penetrated by at least one air gap. A volume is formed between the resonator and the slit channel element, which on the one hand couples acoustically to the slit channel element and on the other hand acoustically to the sound inlet opening of the resonator. The basic element formed from the resonator, the gap channel element and the volume in between has a flat structure and is nevertheless suitable for the absorption of low frequencies. The resonator can have one or more resonance frequencies, all of which are preferably all in the low frequency range of, for example, below 200 Hz.
Es hat sich gezeigt, dass das zwischen dem Spaltkanalelement und dem Resonator angeordnete Volumen einen erheblichen Einfluss auf die Dämpfung bei tiefen Frequenzen hat. Deswegen ist über den Abstand des Spaltkanalelements von dem Resonator die Dämpfung bei tiefen Frequenzen steuerbar. Außerdem sind über die Anzahl der Spaltkanäle die Dämpfungseigenschaften steuerbar.It has been shown that the volume arranged between the gap channel element and the resonator has a considerable influence on the damping at low frequencies. For this reason, the damping at low frequencies can be controlled via the distance between the gap channel element and the resonator. In addition, the damping properties can be controlled via the number of slit channels.
Der Resonator ist vorzugsweise ein Helmholtzresonator, an dessen Schalleingangsöffnung ein internes Luftvolumen angekoppelt ist. Vorzugsweise ist das Luftvolumen in Form einer Kanalstruktur ausgebildet, wobei diese Kanalstruktur eine oder mehrere Verzweigungen sowie eine oder mehrere Abbiegungen aufweisen kann. Die Kanalstruktur kann beispielsweise mehrere ineinander geschachtelte Helmholtzresonatoren ergeben, die in einer Ebene und somit zweidimensional angeordnet ist. Vorzugsweise erstreckt sich diese Ebene quer zu der Richtung der Schalleingangsöffnung. Die ineinander geschachtelten Helmholzresonatoren sind vorzugsweise auf unterschiedliche Frequenzen abgestimmt.The resonator is preferably a Helmholtz resonator, to whose sound inlet opening an internal volume of air is coupled. The air volume is preferably designed in the form of a channel structure, it being possible for this channel structure to have one or more branches and one or more bends. The channel structure can, for example, result in a number of Helmholtz resonators nested one inside the other, which are arranged in one plane and thus two-dimensionally. This plane preferably extends transversely to the direction of the sound inlet opening. The nested Helmholz resonators are preferably tuned to different frequencies.
Ineinander geschachtelte Helmholtzresonatoren können gebildet werden, indem die Kanalstruktur mehrere rundringförmige, polygonringförmige oder rechteckringförmige, konzentrisch zueinander angeordnete Abschnitte aufweist, die jeweils über eine Schalldurchtrittsöffnung miteinander verbunden sind. Damit lässt sich ein breiter Frequenzbereich festlegen, in dem eine erhebliche Schalldämpfung auftritt.Helmholtz resonators nested in one another can be formed by the channel structure having a plurality of annular, polygonal or rectangular ring-shaped, concentrically arranged sections which are each connected to one another via a sound passage opening. This allows a broad frequency range to be defined in which considerable sound attenuation occurs.
Das Spaltkanalelement weist einen Luftspalt auf, dessen Querschnitt vorzugsweise die Form eines langgestreckten Rechtecks aufweist. Das Rechteck ist vorzugsweise schlank, d.h., sein Seitenverhältnis kann größer als 1:10 vorzugsweise größer als 1:20 sein. Der Luftspalt kann in Schallausbreitungsrichtung eine Länge aufweisen, die ein Vielfaches der Länge der kurzen Seite des rechteckigen Querschnitts beträgt. Er kann jedoch in Schallausbreitungsrichtung kürzer sein als die Länge der langen Seite des Rechtecks. Der Luftspalt kann einem geraden oder einem mehrfach gefalteten Pfad folgend ausgebildet sein. In dem Spaltkanalelement können ein oder mehrere solcher Luftspalte vorgesehen sein. Auf das Spaltkanalelement auftreffender Umgebungsschall wird durch den Luftspalt an das zwischen dem Spaltkanalelement und dem Resonator eingeschlossenen Volumen gekoppelt. Der Schall wird dann über die Schalleingangsöffnung aus dem Volumen in den Resonator geleitet.The gap channel element has an air gap, the cross section of which preferably has the shape of an elongated rectangle. The rectangle is preferably slim, ie its aspect ratio can be greater than 1:10, preferably greater than 1:20. The air gap can have a length in the direction of sound propagation which is a multiple of the length of the short side of the rectangular cross section. However, it can be shorter in the direction of sound propagation than the length of the long side of the rectangle. The air gap can be formed following a straight path or a path that is folded several times. One or more such air gaps can be provided in the gap channel element. Striking the gap channel element Ambient sound is coupled through the air gap to the volume enclosed between the gap channel element and the resonator. The sound is then conducted from the volume into the resonator via the sound inlet opening.
Dem Spaltkanalelement kann ein Hochfrequenzabsorber vorgelagert sein. Dieser kann wiederum über einen Hohlraum an das Spaltkanalelement angeschlossen sein. Der Hochfrequenzabsorber kann aus einem oder mehreren Wabenelementen bestehen, deren Waben beidseits offen sind. Schallquellenseitig kann das Wabenelement oder der sonstige Hochfrequenzabsorber eine textilbedeckte Fläche aufweisen.A high-frequency absorber can be arranged in front of the gap channel element. This can in turn be connected to the gap channel element via a cavity. The high-frequency absorber can consist of one or more honeycomb elements, the honeycombs of which are open on both sides. On the sound source side, the honeycomb element or the other high-frequency absorber can have a textile-covered surface.
Insgesamt wird so ein Schallabsorptionselement mit breitbandigen Schallabsorptionseigenschaften geschaffen, das stark schalldämpfend bis in den Tieffrequenzbereich hinein wirkt und eine geringe Dicke aufweist.Overall, a sound absorption element with broadband sound absorption properties is created, which has a strong sound-absorbing effect down to the low-frequency range and is thin.
Weitere Einzelheiten vorteilhafter Ausführungsformen der Erfindung sind Gegenstand der Zeichnung, der Beschreibung und von Ansprüchen. Es zeigen:
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1 einen Schallabsorber, in perspektivischer Ansicht unter Veranschaulichung seiner schichtweise angeordneten verschiedenen Funktionseinheiten, -
2 den Schallabsorber nach1 , in einer Explosionsdarstellung zur Veranschaulichung seines inneren Aufbaus, -
3 einen zu dem Schallabsorber gehörigen Resonanzor sowie das zugehörige Spaltkanalelement, in Querschnittsdarstellung, -
4 den Resonator in Draufsicht mit abgenommener oberer Abschlusswand, -
5 das Spaltkanalelement in Draufsicht, -
6 eine Ausführungsvariante des Spaltkanalelements, -
7 eine alternative Ausführungsform des Resonators in einer der4 entsprechenden Darstellung.
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1 a sound absorber, in a perspective view showing its various functional units arranged in layers, -
2 the sound absorber1 , in an exploded view to illustrate its internal structure, -
3 a resonance core belonging to the sound absorber as well as the associated gap duct element, in a cross-sectional view, -
4th the resonator in plan view with the upper end wall removed, -
5 the split duct element in plan view, -
6th a variant of the split duct element, -
7th an alternative embodiment of the resonator in one of the4th corresponding representation.
Der Schallabsorber
Der Resonator
Das Gehäuse
Die Wandanordnungen 18, 19, 20 sind vorzugsweise so gegeneinander gedreht, dass die Schallübertrittsöffnung 22, 23, 24 jeweils voneinander weg weisen. Wird die Schalleingangsöffnung
Es versteht sich, dass die oben beschriebene Kanalstruktur
Vorzugsweise stehen die Größen der Schallübertrittsöffnungen 22 bis 24 in einem festen Verhältnis zur Größe der jeweiligen Wandanordnung 18 bis 20. Vorzugsweise gilt mit der Vermaßung in
Das Volumen
Das Volumen
Wie
Durch die akustische Ankopplung des Volumens
Sowohl der Resonator
Wie aus
Die Wabenelemente
Der erfindungsgemäße Schallabsorber
BezugszeichenlisteList of reference symbols
- 1010
- SchallabsorberSound absorber
- 1111th
- ResonatorResonator
- 1212th
- SpaltkanalelementSplit channel element
- 1313th
- Volumenvolume
- 1414th
- Gehäusecasing
- 1515th
- GehäusewandHousing wall
- 1616
- SchalleingangsöffnungSound inlet opening
- 1717th
- Innenrauminner space
- 18 - 2018-20
- WandanordnungenWall arrangements
- 2121
- KanalstrukturChannel structure
- 22 - 2422-24
- SchallübertrittsöffnungSound passage opening
- 2525th
- AbstandshalterSpacers
- 2626th
- SpaltkanalGap canal
- 2727
- EintrittsöffnungInlet opening
- 2828
- AustrittsöffnungOutlet opening
- 2929
- WandWall
- 3030th
- HochfrequenzdämpferHigh frequency damper
- 31, 3231, 32
- WabenelementeHoneycomb elements
- 33, 3433, 34
- AbstandshalterSpacers
- 35, 3635, 36
- TextilTextile
- 3737
- AbbiegungenTurns
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDED IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturPatent literature cited
- US 2015/0008281 A1 [0006]US 2015/0008281 A1 [0006]
- US 3822762 [0006]US 3822762 [0006]
- US 5543198 [0006]US 5543198 [0006]
- EP 2388135 B1 [0006]EP 2388135 B1 [0006]
- EP 1845200 A1 [0006]EP 1845200 A1 [0006]
Zitierte Nicht-PatentliteraturNon-patent literature cited
- „A double layer acoustic absorber as potential substitute for traditional microperforated elements", Fabio Auriemma; Proceedings of Meetings on Acoustics, Vol. 30, 030004 (2017) [0004]"A double layer acoustic absorber as potential substitute for traditional microperforated elements", Fabio Auriemma; Proceedings of Meetings on Acoustics, Vol. 30, 030004 (2017) [0004]
Claims (15)
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DE102020116396.7A DE102020116396A1 (en) | 2020-06-22 | 2020-06-22 | Sound absorber |
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DE102020116396.7A DE102020116396A1 (en) | 2020-06-22 | 2020-06-22 | Sound absorber |
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DE102020116396A1 true DE102020116396A1 (en) | 2021-12-23 |
Family
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DE102020116396.7A Pending DE102020116396A1 (en) | 2020-06-22 | 2020-06-22 | Sound absorber |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115848285A (en) * | 2023-02-10 | 2023-03-28 | 质子汽车科技有限公司 | Vehicle anechoic chamber and vehicle |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3822762A (en) | 1971-09-23 | 1974-07-09 | Mc Donnell Douglas Corp | Decorative acoustic panel |
GB1467811A (en) | 1974-07-02 | 1977-03-23 | Ardente Ltd | Composite sound insulating material and a sound-proofed chamber comprising said material |
US5543198A (en) | 1988-07-25 | 1996-08-06 | Short Brothers Plc | Noise attenuation panel |
US6021612A (en) | 1995-09-08 | 2000-02-08 | C&D Technologies, Inc. | Sound absorptive hollow core structural panel |
EP1845200A1 (en) | 2006-04-10 | 2007-10-17 | Offner Öko-Produkte GmbH | Noise insulation element |
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