EP2071561A3 - Absorbent structure for reducing the noise generated in particular by a rotor and fairing comprising such a structure - Google Patents

Absorbent structure for reducing the noise generated in particular by a rotor and fairing comprising such a structure Download PDF

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Publication number
EP2071561A3
EP2071561A3 EP08020965.3A EP08020965A EP2071561A3 EP 2071561 A3 EP2071561 A3 EP 2071561A3 EP 08020965 A EP08020965 A EP 08020965A EP 2071561 A3 EP2071561 A3 EP 2071561A3
Authority
EP
European Patent Office
Prior art keywords
reducing
fairing
rotor
acoustic waves
waves emitted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08020965.3A
Other languages
German (de)
French (fr)
Other versions
EP2071561A2 (en
EP2071561B1 (en
Inventor
Henri-James Marze
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Helicopters SAS
Original Assignee
Airbus Helicopters SAS
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Filing date
Publication date
Application filed by Airbus Helicopters SAS filed Critical Airbus Helicopters SAS
Publication of EP2071561A2 publication Critical patent/EP2071561A2/en
Publication of EP2071561A3 publication Critical patent/EP2071561A3/en
Application granted granted Critical
Publication of EP2071561B1 publication Critical patent/EP2071561B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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

Abstract

La présente invention concerne une structure absorbante pour réduire la propagation d'ondes acoustiques émises par dispositifs bruyant du genre rotors ou moteurs, comportant une cloison rigide (1), au moins une paroi poreuse (4) et des moyens de séparation (2) pour disposer la paroi poreuse (4) à une distance déterminée de la cloison rigide (1), en délimitant des cavités (3) d'une hauteur h1 entre ladite paroi poreuse (4) et ladite cloison rigide (1), ladite hauteur h1 étant déterminée pour obtenir une absorption maximale d'une fréquence donnée des ondes acoustiques émises, caractérisé en ce qu'elle comporte des moyens d'absorption complémentaires pour obtenir une absorption maximale d'au moins une fréquence supplémentaire, des ondes acoustiques émises.

Figure imgaf001
The present invention relates to an absorbent structure for reducing the propagation of acoustic waves emitted by noisy devices such as rotors or motors, comprising a rigid partition (1), at least one porous wall (4) and separation means (2) for disposing the porous wall (4) at a determined distance from the rigid partition (1), delimiting cavities (3) of a height h1 between said porous wall (4) and said rigid partition (1), said height h1 being determined to obtain a maximum absorption of a given frequency of the acoustic waves emitted, characterized in that it comprises complementary absorption means to obtain a maximum absorption of at least one additional frequency, acoustic waves emitted.
Figure imgaf001
EP08020965.3A 2007-12-14 2008-12-03 Absorbent structure for reducing the noise generated in particular by a rotor and fairing comprising such a structure Active EP2071561B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0708699A FR2925208B1 (en) 2007-12-14 2007-12-14 ABSORBENT STRUCTURE FOR ATTENUATING NOISE GENERATED IN PARTICULAR BY A ROTOR AND FAIRING COMPRISING SUCH A STRUCTURE

Publications (3)

Publication Number Publication Date
EP2071561A2 EP2071561A2 (en) 2009-06-17
EP2071561A3 true EP2071561A3 (en) 2017-05-17
EP2071561B1 EP2071561B1 (en) 2021-02-03

Family

ID=39691154

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08020965.3A Active EP2071561B1 (en) 2007-12-14 2008-12-03 Absorbent structure for reducing the noise generated in particular by a rotor and fairing comprising such a structure

Country Status (6)

Country Link
US (1) US7779965B2 (en)
EP (1) EP2071561B1 (en)
JP (1) JP2009145891A (en)
CN (1) CN101458926B (en)
CA (1) CA2646933C (en)
FR (1) FR2925208B1 (en)

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US7913813B1 (en) * 2009-10-21 2011-03-29 The Boeing Company Noise shield for a launch vehicle
US8770343B2 (en) * 2011-11-23 2014-07-08 The Boeing Company Noise reduction system for composite structures
GB201209658D0 (en) * 2012-05-31 2012-07-11 Rolls Royce Plc Acoustic panel
EP2706009B1 (en) 2012-09-07 2016-04-27 AIRBUS HELICOPTERS DEUTSCHLAND GmbH An empennage of a helicopter
JP5787947B2 (en) * 2013-08-09 2015-09-30 三菱電機株式会社 Soundproofing device, elevator hoisting machine and elevator
US8997923B2 (en) * 2013-08-12 2015-04-07 Hexcel Corporation Sound wave guide for use in acoustic structures
EP2878433B1 (en) 2013-11-29 2016-04-20 AIRBUS HELICOPTERS DEUTSCHLAND GmbH Shrouded rotary assembly from segmented composite for aircraft and method for its manufacture
EP2913270B1 (en) * 2014-02-28 2016-02-24 AIRBUS HELICOPTERS DEUTSCHLAND GmbH Rotorcraft with at least one main rotor and at least one counter-torque rotor
EP2913271A1 (en) * 2014-02-28 2015-09-02 AIRBUS HELICOPTERS DEUTSCHLAND GmbH Rotorcraft with at least one main rotor and at least one counter-torque rotor
EP2913269B1 (en) * 2014-02-28 2019-01-16 AIRBUS HELICOPTERS DEUTSCHLAND GmbH Rotorcraft with at least one main rotor and at least one counter-torque rotor
US10814966B2 (en) * 2015-05-25 2020-10-27 Dotterel Technologies Limited Shroud for an aircraft
CN105620716A (en) * 2016-03-07 2016-06-01 刘海涛 Sound insulation method for manned multi-rotor air vehicle
FR3054608B1 (en) * 2016-07-29 2020-06-26 Safran ACOUSTIC PANEL FOR A TURBOMACHINE AND ITS MANUFACTURING METHOD
JP7006083B2 (en) * 2017-09-26 2022-01-24 富士フイルムビジネスイノベーション株式会社 Noise reduction structure and image forming equipment
CN108791868A (en) * 2018-07-31 2018-11-13 刘浩然 A kind of new transport unmanned plane of safety and stability
JP7398742B2 (en) 2020-06-09 2023-12-15 戸田建設株式会社 Propagated sound suppression structure and pipe propagated sound suppression structure
CN113674727A (en) * 2021-08-05 2021-11-19 北京市劳动保护科学研究所 Deep sub-wavelength low-frequency sound absorption structure and sound absorption unit

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FR2674362A1 (en) * 1991-03-18 1992-09-25 Grumman Aerospace Corp ACOUSTICAL ATTENUATION INSULATION WITH SEGMENTED RESISTANCE.
DE29512787U1 (en) * 1995-08-09 1995-10-12 Duerr Metalltechnik Noise protection device, especially for roadsides and tunnels
US6114652A (en) * 1998-09-10 2000-09-05 Northrop Grumman Corporation Method of forming acoustic attenuation chambers using laser processing of multi-layered polymer films
EP1111584A1 (en) * 1999-12-24 2001-06-27 Eads Airbus SA Manufacturing process of an acoustically resistive layer for acoustic panel
US20060219477A1 (en) * 2005-04-04 2006-10-05 Earl Ayle Acoustic septum cap honeycomb

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SE525812C2 (en) * 2002-06-12 2005-05-03 Saab Ab Acoustic lining, use of a lining and ways of producing an acoustic lining
JP2005313835A (en) * 2004-04-30 2005-11-10 Toyoda Gosei Co Ltd Shock absorber for vehicle
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Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2482663A1 (en) * 1980-05-17 1981-11-20 Rolls Royce MULTI-LAYER ACOUSTIC INSULATION COATING
FR2674362A1 (en) * 1991-03-18 1992-09-25 Grumman Aerospace Corp ACOUSTICAL ATTENUATION INSULATION WITH SEGMENTED RESISTANCE.
DE29512787U1 (en) * 1995-08-09 1995-10-12 Duerr Metalltechnik Noise protection device, especially for roadsides and tunnels
US6114652A (en) * 1998-09-10 2000-09-05 Northrop Grumman Corporation Method of forming acoustic attenuation chambers using laser processing of multi-layered polymer films
EP1111584A1 (en) * 1999-12-24 2001-06-27 Eads Airbus SA Manufacturing process of an acoustically resistive layer for acoustic panel
US20060219477A1 (en) * 2005-04-04 2006-10-05 Earl Ayle Acoustic septum cap honeycomb

Also Published As

Publication number Publication date
EP2071561A2 (en) 2009-06-17
CN101458926A (en) 2009-06-17
EP2071561B1 (en) 2021-02-03
FR2925208B1 (en) 2016-07-01
US20090152395A1 (en) 2009-06-18
CN101458926B (en) 2012-07-04
US7779965B2 (en) 2010-08-24
FR2925208A1 (en) 2009-06-19
CA2646933C (en) 2013-05-21
CA2646933A1 (en) 2009-06-14
JP2009145891A (en) 2009-07-02

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