EP0817164A1 - Structures d'absorption de bruit et parois constituées de ces structures - Google Patents
Structures d'absorption de bruit et parois constituées de ces structures Download PDFInfo
- Publication number
- EP0817164A1 EP0817164A1 EP97401411A EP97401411A EP0817164A1 EP 0817164 A1 EP0817164 A1 EP 0817164A1 EP 97401411 A EP97401411 A EP 97401411A EP 97401411 A EP97401411 A EP 97401411A EP 0817164 A1 EP0817164 A1 EP 0817164A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane
- structure according
- dissipation
- frame
- plates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012528 membrane Substances 0.000 claims abstract description 75
- 239000004020 conductor Substances 0.000 claims abstract description 8
- 230000021715 photosynthesis, light harvesting Effects 0.000 claims description 21
- 238000005096 rolling process Methods 0.000 claims description 15
- 238000010521 absorption reaction Methods 0.000 claims description 13
- 230000004048 modification Effects 0.000 claims description 10
- 238000012986 modification Methods 0.000 claims description 10
- 230000003068 static effect Effects 0.000 claims description 8
- 230000010287 polarization Effects 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 3
- 230000010365 information processing Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 7
- 238000005192 partition Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Images
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
Definitions
- the invention generally relates to structures of noise absorption and walls formed by means of these structures and more particularly such light and compact structures, applicable especially in the aeronautical industry for equipment reactors, their nacelles and aircraft cabins, in the transportation industry, in the building, etc ...
- the object of the present invention is to provide important improvements to these structures.
- Its purpose is light structures of aforementioned type and whose acoustic impedances are modifiable, adjustable or controllable and likely to monitor changes in the noise sources to be absorbed.
- a structure noise absorption including a support frame on which is stretched and fixed a waterproof membrane whose outside the frame receives acoustic waves, a gas such as air filling a volume delimited by the frame and the membrane, and means for energy dissipation housed in this volume, characterized in that the means of dissipation are of the type gas rolling, electrostatic type or type electromagnetic and are changeable, adjustable or controllable for modification or adaptation of the impedance acoustics of said structure with the characteristics of noise to absorb.
- the structures according to the invention thanks to the their acoustic impedances can be changed or adjustable, can be designed or adjusted to absorb incident noise or to deflect it by reflection, by example according to the positions they occupy in a noise absorbing or protective wall the noise.
- the energy dissipation means are of the rolling type gas and include plates arranged inside from the frame, a short distance from the membrane, and means modification of this distance.
- the means at gas rolling dissipation include at least one gas flow passage connecting a closed chamber delimited inside the frame by the membrane at a another room located inside said structure.
- this passage can be a conduit formed between two superimposed plates associated with means for modifying or adjusting the distance between them for modification or adjustment of the section of passage of the conduit.
- the means dissipation to gas rolling include rods carried by the membrane and extending perpendicularly to it inside the frame in fixed tubes which are closed at their opposite end to the membrane and which delimit with the rods of the annular conduits of gas rolling.
- the means of energy dissipation include electrode plates arranged parallel to the membrane at a distance therefrom, and to the minus another electrode formed on the membrane and connected with said plates to polarization means such as a direct current source associated with a electrical or electronic circuit comprising elements of energy dissipation by Joule effect.
- the membrane may have one or more several metallized areas opposite the plates aforementioned electrodes, or it is made in one electrically charged plastic, in which case polarization means are not required.
- the elements of energy dissipation by Joule effect include for example resistance electric, advantageously adjustable, the structure according to the invention then comprising means controlled from adjustment of the value of this resistance for adaptation acoustic impedance.
- the means of energy dissipation are of the electromagnetic type and include electrical conductors moved by the membrane in relation to magnetic elements carried by the framework or constituted by it, the conductors aforementioned electrics comprising for example windings connected to the membrane or one or more circuits printed or deposited on the membrane.
- a membrane can be used magnetic displaceable relative to a circuit electric.
- each aforementioned structure is closed from tightly sealed and contains an expandable volume element and contractile such as a balloon or a bellows by example, filled with air and communicating with the outside by a static pressure equalization orifice, this element occupying a significant fraction of the volume of said structure.
- an expandable volume element and contractile such as a balloon or a bellows by example
- This feature compensates for influences of variations in pressure and external temperatures on the membrane of the structure noise absorption.
- Each structure of the aforementioned type is intended to be juxtaposed and assembled to a plurality of structures of the same type to form a flat wall or curved, convex or concave in which the structures have similar or different acoustic impedances to absorb noise or deflect it by reflection according to cases.
- the means of energy dissipation of at least some of the structures are associated with means for controlling, adjusting or themselves piloted by a system of data processing.
- the noise absorption structure according to the invention includes essentially a thin, gas-tight membrane 10 which is stretched and fixed on the upper side of a frame support 12 whose upper part is formed with partitions perpendicular to the membrane and whose lower part 16 has a bottom wall 18 parallel to the membrane.
- the membrane 10 can be produced in particular by plastic, elastomer, metal or any material to make a membrane sufficiently fine and flexible to be deformable by waves acoustic to absorb.
- This membrane being fragile, acoustically transparent means (not shown) are designed to cover it and protect it from attack external mechanical, these means being for example constituted by a metallic fabric associated with a layer glass wool or the like.
- the support frame 12 is made in all suitable rigid material, in particular of metal or plastic, depending on the application for which the structure according to the invention is intended.
- the membrane 10 can be fixed on the frame 12 by its edges 20 folded over the periphery of the part upper part of the frame 12.
- An entourage 22 can be attached to the periphery of the frame 12 as shown schematically in Figure 1 to ensure the connection of structures together, for example by means 24 attachment or assembly such as studs and dovetail grooves.
- the structure according to the invention forms a waterproof enclosure
- an element 26 liable to contract and expand according to pressure variations static and / or temperature outside the noise absorption structure according to the invention, this element 26 which may consist of a flexible balloon or a bellows connected to the outside by a passage or orifice 28 of static pressure equalization, crossing through example the bottom wall 18 of the frame 12.
- This element 26 occupies a relatively significant volume delimited by frame 12 and the membrane 10, for example about a third of this volume.
- the pressure or the gas temperature rises or falls so corresponding to the interior of element 26 and compensates at least partially the pressure variations at inside the structure, which makes it possible to membrane 10 almost insensitive to variations in external static pressure and temperature.
- the elements 26 allow each structure to be adapted to The evolution of the static pressure in the duct.
- the membrane 10 can be fixed by gluing on the upper peripheral part of the frame 12, as already indicated, as well as on the upper edges of the partitions internal 14 of frame 12.
- the internal partitions 14 of the frame 12 can be replaced by studs 30 perpendicular to the membrane and on the ends which the membrane can be fixed by gluing.
- the studs 30 can be carried by a perforated plate 32, by a grid, or by any other appropriate means.
- the noise absorption structure according to the invention also includes means of dissipation of energy of which various embodiments are shown by way of example in FIGS. 4 to 13.
- the means of dissipation are of the gas rolling type, (for example air).
- the internal partitions 14 of the frame 12 delimit with the membrane 10 of the chambers 34 closed by a wall bottom 36 and which communicate with the lower volume of the frame 12 by a conduit 38 of relatively cross section small and relatively long compared to to its section, allowing energy dissipation by laminar gas flow.
- conduit 38 is replaced by a channel 40 formed in hollow in the upper face of the bottom wall 36 to which is associated with a cover plate 42 which constitutes the upper wall of the channel 40.
- An orifice 44 of the plate 42 connects the chamber 34 to the channel 40, while an orifice 46 of the bottom wall 36 connects the channel 40 at the lower volume of the frame 12.
- the channel 40 can be formed in a spiral in the bottom wall 36 of the chamber 34.
- the membrane 10 deforms and behaves like a very damped oscillator whose center frequency is a function of the voltage of the membrane, its density and thickness, among others.
- the deformation of the membrane causes a laminar gas flow in the means of dissipation of energy constituted by the conduit 38 or the channel 40.
- the acoustic impedance of a structure according to the invention is perfectly suited to the characteristics incident noise when it is completely absorbed, without reflection by the membrane.
- the invention provides means for modify, adjust or control this impedance acoustic.
- the means of energy dissipation include a channel 40 of the type shown in Figures 5 and 6, the modification or adjustment of the acoustic impedance can be obtained by variation of the cross section of channel 40.
- the means of energy dissipation include a channel 40 of the type shown in Figures 5 and 6, the modification or adjustment of the acoustic impedance can be obtained by variation of the cross section of channel 40.
- the means 50 being for example of the memory type of shape or piezoelectric type, controlled by a appropriate electrical circuit.
- the membrane 10 carries rods 52 which extend to inside the support frame, perpendicular to the membrane, and which are engaged in tubes 54 carried by an intermediate wall 36 of the support frame, so that the displacement of the rods 52 in the tubes 54 caused by deformations of the membrane 10 results in a laminar gas flow in the tubes 54 and by a corresponding energy dissipation.
- the energy dissipation means are also of the gas rolling type and comprise horizontal plates 56 arranged parallel to the membrane 10 and at a short distance from the latter inside the support frame, these plates 56 being carried by means 58 making it possible to modify the distance d between the membrane 10 and the plates 56.
- these means 58 are carried by the intermediate wall 36 and include controlled shape memory elements by an appropriate electrical circuit 60.
- the means of energy dissipation include electrode plates 62 arranged inside the frame of support, parallel to membrane 10 and low distance from it, and for example carried by the wall intermediate 36 of the support frame through dielectric elements 64.
- the membrane 10 includes electrodes associated with the plates 62, such for example that metallized areas 66 of its surface, these areas 66 and the plates 62 being connected to the poles of a source 68 direct current through an element of energy dissipation such as electrical resistance 70 which is advantageously a variable resistance controlled by an appropriate means 72, the resistor 70 absorbing energy by Joule effect and the variation of its value to modify the acoustic impedance of the structure according to the invention.
- holes 74 are drilled in the electrode plates 62 to avoid any effect of gas rolling between them and the membrane 10.
- the electrostatic attraction exerted by plates 62 on the membrane plays the role of an anti-stiffness dynamic which opposes the stiffness of the gas contained in the structure. This reduces the total thickness (or height) of the structure and therefore its size.
- the membrane 10 and / or the plates electrodes 62 could consist of an electret, such as a plastic like polyurethane or PVDF electrically charged in permanence, the polarization means of the electrodes then being deleted.
- the means of energy dissipation are of the type electromagnetic.
- the membrane 10 is connected, to inside the frame, to electrical windings 76 movable relative to magnetic elements 78 constituting for example the intermediate wall 34 of the support frame.
- the parts 78 projecting towards the membrane may be drilled through holes 80.
- magnetic elements 82 for example magnets permanent
- electrical conductors 84 are carried by this last, by being constituted for example by one or more electrical circuits printed or deposited on the membrane. The displacement of these electrical conductors 84 in the magnetic field lines of the elements 80 results in energy dissipation.
- the support frame 12 which can be made of magnetic material and constitute a magnet permanent whose field lines can be cut by the electrical conductors 84 of the membrane 10 for an energy dissipation effect.
- a magnetic membrane that moves relative to a electrical circuit to dissipate energy.
- the elementary noise absorption structures which have just been described can be assembled together to form flat, curved, concave or convex walls, of large dimension.
- the elementary structures of FIGS. 4, 5, 8 and 9 may have dimensions, on the surface, of the order of 5 ⁇ 5 cm 2 and be combined to form a structure of the type of that represented in FIG. 1 having a surface of the order of 20 x 20 cm 2 , the heights of these structures generally being between 15 and 50 mm.
- the acoustic impedances of elementary structures can be adjusted individually or in small groups of structures.
- Adjusting the acoustic impedances makes it possible to have a well-adapted impedance for certain surface areas of a wall with maximum absorption of the incident noise, while other surface areas of the wall will have different impedances to partially absorb the noise. incident and partially reflect it in a determined direction.
- the possibility of adjusting the acoustic impedance of each elementary structure provides a spatial evolution of acoustic characteristics of a wall.
- the structures according to the invention such as those of Figure 2, adapt automatically at variations in static pressure external and for example to the evolution of the pressure static in a duct.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
Description
- la figure 1 est une vue schématique en perspective avec arrachement partiel d'une structure d'absorption de bruit selon l'invention ;
- la figure 2 est une vue schématique en coupe selon la ligne II-II de la figure 1 ;
- la figure 3 est une vue schématique partielle en perspective d'une variante de réalisation ;
- les figures 4 à 13 représentent schématiquement divers modes de réalisation des moyens de dissipation d'énergie.
Claims (15)
- Structure d'absorption de bruit, comprenant un cadre de support (12) sur lequel est tendue et fixée une membrane étanche (10) dont la face extérieure reçoit des ondes acoustiques, un gaz tel par exemple que de l'air remplissant un volume interne délimité par le cadre (12) et la membrane (10), et des moyens de dissipation d'énergie logés dans ledit volume, caractérisée en ce que les moyens de dissipation d'énergie sont du type à laminage de gaz, du type électrostatique ou du type électromagnétique et sont modifiables, réglables ou pilotables pour modification de l'impédance acoustique de ladite structure en fonction des caractéristiques du bruit à absorber.
- Structure selon la revendication 1, caractérisée en ce que les moyens de dissipation du type à laminage de gaz comprennent des plaques (56) disposées à l'intérieur du cadre (12), à faible distance de la membrane (10), et des moyens (58,60) de modification de cette distance.
- Structure selon la revendication 1, caractérisée en ce que les moyens de dissipation à laminage de gaz comprennent au moins un passage ou conduit (38) d'écoulement de gaz reliant une chambre fermée (34) délimitée à l'intérieur du cadre (12) par la membrane (10) à une autre chambre à l'intérieur de ladite structure.
- Structure selon la revendication 3, caractérisée en ce que ledit passage est un canal (40) formé entre deux plaques superposées (36,42).
- Structure selon la revendication 4, caractérisée en ce qu'elle comprend des moyens (48,50) de modification de la section du canal (40) par modification de la distance entre les deux plaques superposées (36,42).
- Structure selon la revendication 1, càractérisée en ce que les moyens de dissipation à laminage de gaz comprennent des tiges (52) portées par la membrane (10) et s'étendant perpendiculairement à celle-ci à l'intérieur du cadre dans des tubes fixes (54) qui sont fermés à leur extrémité opposée à la membrane (10) et qui délimitent avec les tiges (52) des conduits annulaires de laminage de gaz.
- Structure selon l'une des revendications précédentes, caractérisée en ce que son volume interne délimité par la membrane (10), le cadre de support (12) et une paroi de fond (18) portée par le cadre (12) est réglable, par exemple au moyen d'un élément gonflable logé à l'intérieur du cadre.
- Structure selon la revendication 1, caractérisée en ce que les moyens de dissipation du type électrostatique comprennent des plaques électrodes (62) disposées parallèlement à la membrane (10) à distance de celle-ci et au moins une autre électrode formée sur la membrane et reliée avec lesdites plaques (62) à des moyens de polarisation (68) comprenant des éléments de dissipation d'énergie tels qu'une résistance électrique (70) par exemple.
- Structure selon la revendication 8, caractérisée en ce qu'elle comprend des moyens (72) de réglage de la valeur de la résistance électrique (70).
- Structure selon la revendication 8 ou 9, caractérisée en ce que la membrane (10) comporte une ou plusieurs zones métallisées (66) en regard desdites plaques électrodes (62).
- Structure selon la revendication 1, caractérisée en ce que les moyens de dissipation du type électrostatique comprennent des plaques électrodes disposées parallèlement à la membrane à distance de celle-ci et au moins une autre électrode formée par la membrane (10), celle-ci et/ou les plaques (62) étant chargées électriquement en permanence.
- Structure selon la revendication 1, caractérisée en ce que les moyens de dissipation du type électromagnétique comprennent une membrane magnétique déplacée par rapport à un conduit électrique ou bien des conducteurs électriques déplacés par la membrane (10) par rapport à des éléments magnétiques (78,82) portés par le cadre (12) ou constitués par celui-ci, les conducteurs électriques comprenant par exemple des bobinages (76) reliés à la membrane (10) ou des circuits électriques (84) imprimés ou déposés sur la membrane.
- Structure selon l'une des revendications précédentes, caractérisée en ce qu'elle est fermée de façon étanche et contient un élément volumique (26) expansible et contractile tel qu'un ballon ou un soufflet par exemple, rempli d'air et communiquant avec l'extérieur par un orifice (28) d'égalisation de pression statique, cet élément (26) occupant une fraction notable du volume interne de ladite structure.
- Structure selon l'une des revendications 1 à 13, caractérisée en ce qu'elle est juxtaposée et assemblée à une pluralité de structures du même type pour former une paroi plane ou incurvée, convexe ou concave dans laquelle les structures ont des impédances acoustiques semblables ou différentes pour absorber le bruit incident ou le dévier par réflexion selon les cas.
- Paroi selon la revendication 14, caractérisée en ce que les moyens de dissipation d'énergie de certaines au moins desdites structures sont associés à des moyens de commande, de réglage ou de pilotage eux-mêmes pilotables par un système de traitement de l'information, et sont par exemple adaptables au bruit à absorber et à son évolution.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9608064A FR2750527B1 (fr) | 1996-06-28 | 1996-06-28 | Structures d'absorption de bruit et parois constituees de ces structures |
FR9608064 | 1996-06-28 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0817164A1 true EP0817164A1 (fr) | 1998-01-07 |
EP0817164B1 EP0817164B1 (fr) | 2001-11-28 |
EP0817164B2 EP0817164B2 (fr) | 2004-08-25 |
Family
ID=9493519
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97401411A Expired - Lifetime EP0817164B2 (fr) | 1996-06-28 | 1997-06-19 | Structures d'absorption de bruit et parois constituées de ces structures |
Country Status (5)
Country | Link |
---|---|
US (1) | US6332027B1 (fr) |
EP (1) | EP0817164B2 (fr) |
CA (1) | CA2209302C (fr) |
DE (1) | DE69708523T3 (fr) |
FR (1) | FR2750527B1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998022934A1 (fr) * | 1996-11-15 | 1998-05-28 | Northrop Grumman Corporation | Systeme d'insonorisation presentant une garniture acoustique active |
EP0897176A1 (fr) * | 1997-08-14 | 1999-02-17 | Thomson Marconi Sonar Sas | Absorbeur acoustique sous-marin |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6382603B1 (en) * | 2001-02-08 | 2002-05-07 | Lockheed Martin Corporation | Ridged elastomer mount |
PT1779375E (pt) * | 2004-08-06 | 2013-03-18 | Niels Werner Larsen | Método, dispositivo e sistema para a alteração do tempo de repercussão de uma sala |
US7992678B2 (en) * | 2005-05-12 | 2011-08-09 | Pilaar James G | Inflatable sound attenuation system |
JP4782193B2 (ja) * | 2005-05-13 | 2011-09-28 | ラルセン、ニールス、ヴェルナー | 空間の残響時間を変更する方法、装置、及びシステム |
US7819221B1 (en) * | 2005-09-27 | 2010-10-26 | The United States Of America As Represented By The Secretary Of The Air Force | Lightweight acoustic damping treatment |
US8295505B2 (en) * | 2006-01-30 | 2012-10-23 | Sony Ericsson Mobile Communications Ab | Earphone with controllable leakage of surrounding sound and device therefor |
JP2008213547A (ja) * | 2007-02-28 | 2008-09-18 | Nissan Motor Co Ltd | 騒音制御装置 |
RU2357109C1 (ru) * | 2007-11-07 | 2009-05-27 | Международный Научно-Исследовательский Институт Проблем Управления (Мниипу) | Устройство и способ для воздействия на вихревые структуры в турбулентной воздушной струе |
US20170040014A1 (en) * | 2015-08-07 | 2017-02-09 | Alcatel-Lucent Usa Inc. | Acoustic Noise Attenuation Device, Assembly And Metamaterial Structure |
CN110106999A (zh) * | 2019-03-29 | 2019-08-09 | 深圳中天精装股份有限公司 | 一种装配式建筑吸音木隔墙及其设计方法 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2482663A1 (fr) * | 1980-05-17 | 1981-11-20 | Rolls Royce | Revetement d'isolation acoustique a couches multiples |
FR2715244A1 (fr) * | 1994-01-19 | 1995-07-21 | Bertin & Cie | Procédé et dispositif d'absorption de l'énergie d'ondes acoustiques. |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4068736A (en) † | 1975-04-14 | 1978-01-17 | Tempmaster Corporation | Method and device for reducing noise |
DE2834823C2 (de) † | 1978-08-09 | 1980-07-17 | Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen | Volumenändernde Resonatoren nach dem Tellerfeder-Prinzip |
DE3615360A1 (de) † | 1986-05-06 | 1987-11-12 | Stankiewicz Alois Dr Gmbh | Bauelement mit akustischen eigenschaften |
DE4228356C2 (de) † | 1992-08-26 | 1995-10-19 | Daimler Benz Aerospace Ag | Hohlraumresonator zur Lärmreduzierung |
DE9414943U1 (de) † | 1994-09-14 | 1996-01-18 | M. Faist GmbH & Co KG, 86381 Krumbach | Folienresonanzabsorber |
DE9418063U1 (de) † | 1994-11-11 | 1995-01-19 | Wilhelmi Werke GmbH & Co KG, 35633 Lahnau | Bauelement zur Schall-Absorption |
US5778081A (en) * | 1996-03-04 | 1998-07-07 | United Technologies Corp | Active noise control using phased-array active resonators |
JP3510427B2 (ja) * | 1996-08-15 | 2004-03-29 | 三菱重工業株式会社 | 能動吸音壁 |
-
1996
- 1996-06-28 FR FR9608064A patent/FR2750527B1/fr not_active Expired - Lifetime
-
1997
- 1997-06-19 EP EP97401411A patent/EP0817164B2/fr not_active Expired - Lifetime
- 1997-06-19 DE DE69708523T patent/DE69708523T3/de not_active Expired - Lifetime
- 1997-06-26 CA CA2209302A patent/CA2209302C/fr not_active Expired - Fee Related
-
1998
- 1998-01-07 US US09/003,900 patent/US6332027B1/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2482663A1 (fr) * | 1980-05-17 | 1981-11-20 | Rolls Royce | Revetement d'isolation acoustique a couches multiples |
FR2715244A1 (fr) * | 1994-01-19 | 1995-07-21 | Bertin & Cie | Procédé et dispositif d'absorption de l'énergie d'ondes acoustiques. |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998022934A1 (fr) * | 1996-11-15 | 1998-05-28 | Northrop Grumman Corporation | Systeme d'insonorisation presentant une garniture acoustique active |
EP0897176A1 (fr) * | 1997-08-14 | 1999-02-17 | Thomson Marconi Sonar Sas | Absorbeur acoustique sous-marin |
Also Published As
Publication number | Publication date |
---|---|
CA2209302A1 (fr) | 1997-12-28 |
FR2750527A1 (fr) | 1998-01-02 |
EP0817164B2 (fr) | 2004-08-25 |
DE69708523T2 (de) | 2002-06-13 |
US6332027B1 (en) | 2001-12-18 |
EP0817164B1 (fr) | 2001-11-28 |
DE69708523D1 (de) | 2002-01-10 |
CA2209302C (fr) | 2010-12-14 |
DE69708523T3 (de) | 2005-06-09 |
FR2750527B1 (fr) | 1998-08-21 |
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