DE1111799B - Sound absorbing plate - Google Patents

Sound absorbing plate

Info

Publication number
DE1111799B
DE1111799B DES51071A DES0051071A DE1111799B DE 1111799 B DE1111799 B DE 1111799B DE S51071 A DES51071 A DE S51071A DE S0051071 A DES0051071 A DE S0051071A DE 1111799 B DE1111799 B DE 1111799B
Authority
DE
Germany
Prior art keywords
wall
chambers
sound
absorbing
openings
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.)
Pending
Application number
DES51071A
Other languages
German (de)
Inventor
Dr-Ing Antonio Boschi
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.)
Societa Applicazioni Gomma Antivibranti SAGA SpA
Original Assignee
Societa Applicazioni Gomma Antivibranti SAGA SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Societa Applicazioni Gomma Antivibranti SAGA SpA filed Critical Societa Applicazioni Gomma Antivibranti SAGA SpA
Publication of DE1111799B publication Critical patent/DE1111799B/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B1/86—Sound-absorbing elements slab-shaped
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B2001/742—Use of special materials; Materials having special structures or shape
    • E04B2001/747—Corrugated materials
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8461—Solid slabs or blocks layered
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8461—Solid slabs or blocks layered
    • E04B2001/8471—Solid slabs or blocks layered with non-planar interior transition surfaces between layers, e.g. faceted, corrugated
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
    • E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
    • E04B1/84—Sound-absorbing elements
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling
    • E04B2001/848—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element
    • E04B2001/8485—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element the opening being restricted, e.g. forming Helmoltz resonators

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Multimedia (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Building Environments (AREA)
  • Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)

Description

Die Erfindung bezieht sich auf eine schallschlukkende Platte aus aneinanderliegenden Kammern, die an der Außenseite mit Löchern verschiedener Anzahl versehen sind, um als verschieden abgestimmte Luftresonatoren zu wirken.The invention relates to a sound-absorbing plate made of adjacent chambers that are provided on the outside with holes of different numbers in order to be used as differently tuned air resonators to act.

Schallschluckende Platten dieser Art sind aus der Technik bekannt. Sie haben aber keine weite Verbreitung gefunden und dies wegen ihrer zahlreichen Nachteile. So ist es z. B. bekannt, daß die Luftresonatoren in bezug auf die die zu absorbierenden Töne und Geräusche bildenden akustischen Frequenzen nur wahlweise arbeiten; andererseits umfassen diese Töne und Geräusche im allgemeinen einen Frequenzbereich, der bei ungefähr 300 bis 400 Hz beginnt und bis zu ungefähr 2500 bis 3000 Hz reicht. Das bedeutet, daß die Platten der oben genannten Art zum wirksamen Schlucken dieser Geräusche und Töne eine große Anzahl auf entsprechend zahlreiche Frequenzen, z. B. 350, 600, 950, 1300 Hz usw., abgestimmter Luftresonatoren aufweisen müssen, was nicht ohne beachtliche bauliche Schwierigkeiten ausgeführt werden kann und unverhältnismäßig hohe Kosten mit sich bringen würde.Sound-absorbing panels of this type are known from the art. But they are not widely used and this because of their numerous disadvantages. So it is z. B. known that the air resonators with respect to the acoustic frequencies forming the tones and noises to be absorbed work optionally; on the other hand, these tones and noises generally cover a frequency range, which starts at about 300 to 400 Hz and goes up to about 2500 to 3000 Hz. It means that the panels of the above kind for effectively swallowing these noises and tones a large number correspondingly numerous frequencies, e.g. B. 350, 600, 950, 1300 Hz etc., tuned air resonators must have what cannot be carried out without considerable structural difficulties and would entail disproportionately high costs.

Die baulichen Schwierigkeiten werden noch dadurch vermehrt, daß die obenerwähnten schallschlukkenden Platten nur mit Schwierigkeiten selbsttragend zu machen sind und nicht ohne abstützendes und versteifendes Rahmen- bzw. Gitterwerk an Decken befestigt werden können.The structural difficulties are compounded by the fact that the above-mentioned sound-absorbing Slabs can only be made self-supporting with difficulty and not without supporting and stiffening framework or latticework can be attached to ceilings.

Im weiteren bedingt die Tatsache, daß die Platte einerseits eine beschränkte Oberfläche hat, andererseits aber eine große Anzahl von verschieden abgestimmten Luftresonatoren aufweisen müßte, notwendigerweise eine Beschränkung der Anzahl von Luftresonatoren verschiedener Resonanzfrequenz. Demzufolge ist der Gesamtwirkungsgrad der Platte gegenüber dem gewünschten Wert vermindert.Furthermore, the fact that the plate has a limited surface area on the one hand, causes it on the other hand but would have to have a large number of differently tuned air resonators, of necessity a limitation on the number of air resonators of different resonance frequencies. As a result the overall efficiency of the plate is reduced compared to the desired value.

Es wurde nun erstaunlicherweise gefunden, daß alle oben angeführten Nachteile mit der schallschluckenden Platte gemäß der Erfindung leicht vermieden werden können. Die erfindungsgemäße Platte ist dadurch gekennzeichnet, daß die aneinanderliegenden Kammern durch eine wellenartig geformte, die Rückwandung mit der Außenwandung wechselweise schrägverbindende Wandung voneinander getrennt sind und daß die Öffnungen der rückseitigen Kammern an den Stellen der Berührung der gewellten Wandung mit der Außenwandung angeordnet sind.It has now been found, surprisingly, that all of the disadvantages listed above with the sound-absorbing Plate according to the invention can easily be avoided. The plate according to the invention is thereby characterized in that the adjacent chambers by a wave-like shaped, the rear wall with the outer wall alternately obliquely connecting wall are separated from each other and that the openings of the rear chambers at the points of contact of the corrugated wall with the Outer wall are arranged.

Die Zeichnung veranschaulicht in Ansicht von unten einen Abschnitt einer Platte nach der Erfindung. Diese Platte weist eine Außenwandung 1, eine Rückwandung 2 und einen dieselben wechselweiseThe drawing illustrates, in a view from below, a portion of a plate according to the invention. This plate has an outer wall 1, a rear wall 2 and the same alternately

Anmelder:Applicant:

Societä Applicazioni Gomma Antivibranti,
Mailand (Italien)Societä Applicazioni Gomma Antivibranti,
Milan (Italy)

- . Vertreter: Dr. A. Marck, Patentanwalt,
Frankfurt/M., Roseggerstr. 3-. Representative: Dr. A. Marck, patent attorney,
Frankfurt / M., Roseggerstr. 3

Beanspruchte Priorität:
Italien vom 18. Februar 1956 (Nr. 35711)Claimed priority:
Italy of February 18, 1956 (no.35711)

Dr.-Ing. Antonio Boschi, Mailand (Italien),
ist als Erfinder genannt wordenDr.-Ing. Antonio Boschi, Milan (Italy),
has been named as the inventor

schrägverbindende, wellenartig geformte Zwischenwandung 3 auf. Die Wandungen 1, 2, 3 werden vorteilhafterweise in Blech ausgeführt, obwohl auch Pappe und Kunststoffolien verwendet werden können. Die Zwischenwandung 3 unterteilt mit ihren geneigten Teilen 2» α den Raum zwischen den Wandungen 1 und 2 in eine fortlaufende Reihe aneinanderliegender Kammern 4, Aa..., 5, 5a... mit annähernd dreieck- oder trapezförmigem Querschnitt. Die vorseitigen Kammern 5, Sa ... sind den Schallwellen über die in der Außenwandung 1 vorgesehenen Öffnungen 6 zugänglich, während hingegen die rückseitigen Kammern4, 4a ... über die sowohl in der Außenwandung 1 als auch in der Zwischenwandung 3 an den Verbindungsstellen derselben vorgesehenen Öffnungen 7 zugänglich sind.obliquely connecting, wave-like shaped partition 3. The walls 1, 2, 3 are advantageously made of sheet metal, although cardboard and plastic films can also be used. The partition 3 with its inclined parts 2 »α divides the space between the walls 1 and 2 into a continuous row of adjacent chambers 4, Aa ... , 5, 5a ... with an approximately triangular or trapezoidal cross-section. The front chambers 5, Sa ... are accessible to the sound waves via the openings 6 provided in the outer wall 1, while the rear chambers 4, 4a ... are accessible both in the outer wall 1 and in the intermediate wall 3 at the connection points the same openings 7 provided are accessible.

Beim dargestellten Beispiel sind alle Öffnungen 6,7 gleichmäßig auf der Außenwandung 1 verteilt, und es ist ersichtlich, daß jede vorseitige Kammer 5, So eine Anzahl Öffnungen 6 aufweist, die das Dreifache der zu den rückseitigen Kammern 4, 4 a führenden Öffnungen beträgt (oder doch in jedem Fall bedeutend höher ist). Jeder Öffnung 6 entspricht in der entsprechenden Kammer 5, Sa ... deshalb ein kleineres Volumen als das entsprechende für die den rückseitigen Kammern4 bzw. 4a ... angehörende Öffnung7.In the example shown, all openings 6, 7 are evenly distributed on the outer wall 1, and it can be seen that each front chamber 5, So has a number of openings 6 which is three times the number of openings leading to the rear chambers 4, 4 a ( or in any case is significantly higher). Each opening 6 corresponds in the corresponding chamber 5, Sa ... therefore a smaller volume than the corresponding volume for the opening 7 belonging to the rear chambers 4 or 4a ....

Auf den ersten Blick scheint es, daß die erfindungsgemäße Platte nur zwei Arten von Luftresonatoren umfasse: die von den rückseitigen Kammern 4, 4a ... mit den entsprechenden Öffnungen7 gebildeten Niederfrequenzresonatoren und die von den vorseitigen Kammern 5, 5a ... mit den entsprechendenAt first sight it appears that the plate according to the invention comprises only two types of air resonators: the low frequency resonators formed by the rear chambers 4, 4a ... with the corresponding openings 7 and those formed by the front chambers 5, 5a ... with the corresponding

109 649/14109 649/14

Öffnungen 6 gebildeten Hochfrequenzresonatoren. Es könnte deshalb erwartet werden, daß diese Platte nur beschränkte Frequenzstreifen absorbiert wie die bekannten Ausführungen. Es wurde aber im Gegenteil festgestellt, daß eine nach der Erfindung gebaute Platte imstande ist, im ganzen zwischen ungefähr 500 und 2500 Hz liegenden Frequenzbereich wirksam (über 70%) zu absorbieren, während zwischen 300 und 500 Hz liegende Frequenzen noch in einem Ausmaß von über 50% absorbiert werden. Noch bessere Ergebnisse lassen sich erzielen, wenn in den vorseitigen Kammern 5, 5a ..., wie in der Zeichnung dargestellt, eine schalldämpfende Faserstoffüllung vorgesehen wird.Openings 6 formed high frequency resonators. It could therefore be expected that this record would only limited frequency strips absorbed like the known designs. But it turned out to be the opposite found that a panel constructed in accordance with the invention is capable of between about 500 total and 2500 Hz to absorb effectively (over 70%), while between 300 and frequencies lying at 500 Hz are still absorbed to an extent of more than 50%. Even better Results can be achieved if in the front chambers 5, 5a ..., as shown in the drawing, a sound-absorbing fiber filling is provided.

Die Gründe dieser erstaunlich vorteilhaften Ergebnisse sind noch nicht ganz geklärt und scheinen zweifacher Natur zu sein. Einerseits ist diese Erscheinung in vorwiegendem Maße auf die Schräglage der die Rückwandung mit .der Außenwandung verbindenden Teile der Zwischenwandung zurückzuführen, die den annähernd dreieck- oder trapezförmigen Querschnitt der Kammern bildet; andererseits scheint es, daß die einzelnen Luftresonatoren über die geneigten Teile der Zwischenwandung irgendwie miteinander reagieren, da, wie aus zahlreichen Versuchen hervorging, die Absorptionskurve der Platte günstiger ist als die Summe der Absorptionskurven der einzeln geprüften Luftresonatoren, insbesondere wenn die Wandungen aus Blech bestehen.The reasons for these amazingly beneficial results are not yet fully understood and seem twofold To be nature. On the one hand, this phenomenon is mainly due to the inclination of the Back wall with .the outer wall connecting parts of the partition, which the approximately triangular or trapezoidal cross-section of the chambers forms; on the other hand it seems that the individual air resonators react somehow with one another via the inclined parts of the partition wall, since, as has emerged from numerous experiments, the absorption curve of the plate is more favorable than that Sum of the absorption curves of the individually tested air resonators, especially if the walls consist of sheet metal.

Vom technologischen Standpunkt aus bietet der Bau der erfindungsgemäßen Platte keine Schwierigkeit, wie jedem Fachtechniker an Hand der Zeichnung klar werden wird. Aus der Zeichnung geht auch hervor, daß die vorliegende Platte dank der kastenförmigen Ausbildung steif und selbsttragend ist.From a technological point of view, the construction of the panel according to the invention presents no difficulty, as will become clear to every specialist technician on the basis of the drawing. The drawing also works shows that the present plate is rigid and self-supporting thanks to the box-shaped design.

Claims (2)

PATENTANSPRÜCHE:PATENT CLAIMS: ίο 1. Schallschluckende Platte aus aneinanderlie-ίο 1. Sound-absorbing plate made of adjoining genden Kammern, die an der Außenseite mit Löchern verschiedener Anzahl versehen sind, um als verschieden abgestimmte Luftresonatoren zu wirken, dadurch gekennzeichnet, daß die Kammern (4, 4a ..., 5, 5a ...) durch eine wellenartig geformte, die Rückwandung (2) mit der Außenwandung (1) wechselweise schräg verbindende Wandung (3) voneinander getrennt sind und daß die Öffnungen (7) der rückseitigen Kammern (4, 4 a ...) an den Stellen der Berührung der gewellten Wandung (3) mit der Außenwandung (1) angeordnet sind.Lowering chambers, which are provided on the outside with holes of different numbers to act as differently tuned air resonators, characterized in that the chambers (4, 4a ..., 5, 5a ...) by a wave-like shaped, the rear wall (2) with the outer wall (1) alternately obliquely connecting wall (3) are separated from each other and that the openings (7) of the rear chambers (4, 4 a ... ) At the points of contact with the corrugated wall (3) with the outer wall (1) are arranged. 2. Platte nach Anspruch 1, dadurch gekennzeichnet, daß die vorderen Kammern (5, 5 a ...) eine schalldämpfende Faserstoffüllung enthalten.2. Plate according to claim 1, characterized in that the front chambers (5, 5 a ...) contain a sound-absorbing fiber filling. In Betracht gezogene Druckschriften:
Zwikker und Kosten, Sound Absorbing Materials, 1949, S. 158 und 160.Considered publications:
Zwikker and Kosten, Sound Absorbing Materials, 1949, pp. 158 and 160. Hierzu 1 Blatt Zeichnungen1 sheet of drawings
DES51071A 1956-02-18 1956-10-30 Sound absorbing plate Pending DE1111799B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT348808X 1956-02-18

Publications (1)

Publication Number Publication Date
DE1111799B true DE1111799B (en) 1961-07-27

Family

ID=11240619

Family Applications (1)

Application Number Title Priority Date Filing Date
DES51071A Pending DE1111799B (en) 1956-02-18 1956-10-30 Sound absorbing plate

Country Status (5)

Country Link
BE (1) BE554083A (en)
CH (1) CH348808A (en)
DE (1) DE1111799B (en)
FR (1) FR1166394A (en)
GB (1) GB822954A (en)

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US4969535A (en) * 1989-06-26 1990-11-13 Grumman Aerospace Corporation Acoustic liner
US10657947B2 (en) * 2017-08-10 2020-05-19 Zin Technologies, Inc. Integrated broadband acoustic attenuator

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GB1300409A (en) * 1969-08-18 1972-12-20 Secr Defence Improvements in hollow wall structures
US3831710A (en) * 1973-01-24 1974-08-27 Lockheed Aircraft Corp Sound absorbing panel
US3819009A (en) * 1973-02-01 1974-06-25 Gen Electric Duct wall acoustic treatment
US3850261A (en) * 1973-03-01 1974-11-26 Gen Electric Wide band width single layer sound suppressing panel
US3866001A (en) * 1974-03-04 1975-02-11 Junger Miguel C Structural block with septum
US3948346A (en) * 1974-04-02 1976-04-06 Mcdonnell Douglas Corporation Multi-layered acoustic liner
GB1499882A (en) * 1975-02-14 1978-02-01 Rolls Royce Sound attenuating structure
GB1490923A (en) * 1975-06-23 1977-11-02 Short Brothers & Harland Ltd Sound-absorbing structures
US4084366A (en) * 1975-11-14 1978-04-18 Haworth Mfg., Inc. Sound absorbing panel
FR2516034A1 (en) * 1981-11-09 1983-05-13 Peugeot PAVILLON TRIM FOR MOTOR VEHICLE
DE69019133T2 (en) * 1989-06-26 1996-01-04 Grumman Aerospace Corp ACOUSTIC COATING.
US5025888A (en) * 1989-06-26 1991-06-25 Grumman Aerospace Corporation Acoustic liner
US5014815A (en) * 1989-06-26 1991-05-14 Grumman Aerospace Corporation Acoustic liner
DE4131777A1 (en) * 1991-09-24 1993-03-25 Linde Ag FLUID-FLOWED MUFFLER
DE9414943U1 (en) * 1994-09-14 1996-01-18 Faist M Gmbh & Co Kg Foil resonance absorber
DE69809715D1 (en) * 1997-03-07 2003-01-09 Oscar Avian METHOD FOR PRODUCING SOUND-INSULATING BUILDING PLATES OR SURFACES FOR INTERIORS
ES2264879B1 (en) * 2005-03-21 2007-10-16 Angel Julio Moreton Cesteros PANEL FOR ACOUSTIC TREATMENT THROUGH FRAGMENTATION OF REVERBERED SOUND.
FR2899171B1 (en) * 2006-03-31 2009-04-10 Cera COMPONENT FOR TRIM AND ACOUSTIC PROTECTION OF A MOTOR VEHICLE
US9607600B2 (en) 2009-02-06 2017-03-28 Sonobex Limited Attenuators, arrangements of attenuators, acoustic barriers and methods for constructing acoustic barriers
ITMI20100293U1 (en) * 2010-09-22 2012-03-23 Donati Group S P A METALLIC STRUCTURAL COMPOSITE PANEL SOUND ABSORBENT
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AT513134B1 (en) 2012-11-15 2014-02-15 Lb Engineering Gmbh Cladding element for a building
GB201415874D0 (en) * 2014-09-08 2014-10-22 Sonobex Ltd Acoustic Attenuator
CN107489206B (en) * 2017-09-21 2023-08-08 江苏声立方环保科技有限公司 Frame-type acoustic panel without installation
CA3084631A1 (en) * 2020-06-23 2021-12-23 Safran Acoustic panel and associated manufacturing method
EP4047151A1 (en) * 2021-02-19 2022-08-24 Saint-Gobain Ecophon AB A sound insulating element and a suspended ceiling system

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Cited By (2)

* Cited by examiner, † Cited by third party
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US4969535A (en) * 1989-06-26 1990-11-13 Grumman Aerospace Corporation Acoustic liner
US10657947B2 (en) * 2017-08-10 2020-05-19 Zin Technologies, Inc. Integrated broadband acoustic attenuator

Also Published As

Publication number Publication date
GB822954A (en) 1959-11-04
FR1166394A (en) 1958-11-05
BE554083A (en)
CH348808A (en) 1960-09-15

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