GB2005384A - Multi-layer acoustic lining - Google Patents

Multi-layer acoustic lining

Info

Publication number
GB2005384A
GB2005384A GB7836770A GB7836770A GB2005384A GB 2005384 A GB2005384 A GB 2005384A GB 7836770 A GB7836770 A GB 7836770A GB 7836770 A GB7836770 A GB 7836770A GB 2005384 A GB2005384 A GB 2005384A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
sheet
lining
resonators
overlies
multi
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.)
Withdrawn
Application number
GB7836770A
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.)
Rolls-Royce PLC
Original Assignee
Rolls-Royce PLC
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

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02CGAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C7/00Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
    • F02C7/24Heat or noise insulation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02KJET-PROPULSION PLANTS
    • F02K1/00Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
    • F02K1/78Other construction of jet pipes
    • F02K1/82Jet pipe walls, e.g. liners
    • F02K1/827Sound absorbing structures or liners
    • GPHYSICS
    • G10MUSICAL INSTRUMENTS; ACOUSTICS
    • G10KSOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00Methods 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
    • G10K11/16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/172Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects

Abstract

The lining for a fluid-flow duct, e.g. of a gas turbine engine, incorporates resonators of the Helmholtz type, the resonator necks of which define apertures 7 in a sheet which overlies the resonators. A sound permeable facing sheet 10 overlies the apertured sheet to provide an aerodynamically smoother flow surface for the lining. In order to minimise the combined acoustic resistance of the apertured sheet and the facing sheet 10, the latter is spaced away from the former by a small distance, e.g. by elements 8. <IMAGE>
GB7836770A 1977-10-04 1978-09-14 Multi-layer acoustic lining Withdrawn GB2005384A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB4113477 1977-10-04
GB7836770A GB2005384A (en) 1977-10-04 1978-09-14 Multi-layer acoustic lining

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7836770A GB2005384A (en) 1977-10-04 1978-09-14 Multi-layer acoustic lining

Publications (1)

Publication Number Publication Date
GB2005384A true true GB2005384A (en) 1979-04-19

Family

ID=26264596

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7836770A Withdrawn GB2005384A (en) 1977-10-04 1978-09-14 Multi-layer acoustic lining

Country Status (1)

Country Link
GB (1) GB2005384A (en)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318453A (en) * 1979-09-17 1982-03-09 Rohr Industries, Inc. Double layer attenuation panel
WO1985002640A1 (en) * 1983-12-12 1985-06-20 Lockheed Corporation Sound barrier
DE3504208A1 (en) * 1985-02-07 1986-08-07 Fraunhofer Ges Forschung Silencer box
JPS62500920A (en) * 1984-12-10 1987-04-16
DE3807128A1 (en) * 1988-03-04 1989-09-14 Fraunhofer Ges Forschung Schalldaempfendes wall element
EP0700030A3 (en) * 1994-08-31 1996-04-24 Mitsubishi Electric Home Appl Sound absorbing mechanism using a porous material
WO2005091272A1 (en) * 2004-03-17 2005-09-29 Eads Deutschland Gmbh Assembly for reducing noise in turbofan engines
EP1612769A3 (en) * 2004-06-28 2009-03-25 United Technologies Corporation High admittance acoustic liner
EP1752637A3 (en) * 2005-08-10 2009-10-28 United Technologies Corporation Architecture for an acoustic liner
FR2962586A1 (en) * 2010-07-09 2012-01-13 Airbus Operations Sas Panel for performing acoustic treatment in nacelle of aircraft, has resistive layer whose face is in contact with air flow in honeycomb structure and reflecting layer, and openings form angle with layer lower than specific degree
WO2012097998A1 (en) * 2011-01-19 2012-07-26 Rolls-Royce Deutschland Ltd & Co Kg Sound absorber for a gas turbine exhaust cone, and method for the production thereof
DE102011120979A1 (en) * 2011-12-13 2013-06-13 Rolls-Royce Deutschland Ltd & Co Kg acoustic absorber
WO2013156739A1 (en) * 2012-04-20 2013-10-24 Aircelle Thin panel for absorbing sound waves emitted by a turbofan of an aircraft nacelle, and nacelle provided with such a panel
WO2015026421A3 (en) * 2013-07-29 2015-04-09 The Boeing Company Septumization of honeycomb sandwiches
EP2487677A4 (en) * 2010-01-08 2016-03-02 Chinese Acad Inst Acoustics Compound sound absorption device with built-in resonant cavity
FR3065472A1 (en) * 2017-04-25 2018-10-26 Airbus Operations Sas Panel for acoustic treatment comprising an acoustically resistive porous structure having connecting channels

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318453A (en) * 1979-09-17 1982-03-09 Rohr Industries, Inc. Double layer attenuation panel
WO1985002640A1 (en) * 1983-12-12 1985-06-20 Lockheed Corporation Sound barrier
JPS62500920A (en) * 1984-12-10 1987-04-16
DE3504208A1 (en) * 1985-02-07 1986-08-07 Fraunhofer Ges Forschung Silencer box
WO1986004668A1 (en) * 1985-02-07 1986-08-14 Fraunhofer-Gesellschaft Zur Förderung Der Angewand Sound attenuation box
US4787473A (en) * 1985-02-07 1988-11-29 Fraunhofer Gesellschaft Sound attenuating box
DE3807128A1 (en) * 1988-03-04 1989-09-14 Fraunhofer Ges Forschung Schalldaempfendes wall element
EP0700030A3 (en) * 1994-08-31 1996-04-24 Mitsubishi Electric Home Appl Sound absorbing mechanism using a porous material
US5905234A (en) * 1994-08-31 1999-05-18 Mitsubishi Electric Home Appliance Co., Ltd. Sound absorbing mechanism using a porous material
US6109388A (en) * 1994-08-31 2000-08-29 Mitsubishi Electric Home Appliance Co., Ltd. Sound absorbing mechanism using a porous material
WO2005091272A1 (en) * 2004-03-17 2005-09-29 Eads Deutschland Gmbh Assembly for reducing noise in turbofan engines
JP2007529666A (en) * 2004-03-17 2007-10-25 エーアーデーエス・ドイッチェランド・ゲゼルシャフト ミット ベシュレンクテル ハフツング Noise reduction structure of the turbo fan engine
JP4659021B2 (en) * 2004-03-17 2011-03-30 エーアーデーエス・ドイッチェランド・ゲゼルシャフト ミット ベシュレンクテル ハフツング Noise reduction structure of the turbo fan engine
US7819224B2 (en) 2004-03-17 2010-10-26 Eads Deutschland Gmbh Assembly for reducing noise in turbofan engines
EP1612769A3 (en) * 2004-06-28 2009-03-25 United Technologies Corporation High admittance acoustic liner
EP1752637A3 (en) * 2005-08-10 2009-10-28 United Technologies Corporation Architecture for an acoustic liner
EP2487677A4 (en) * 2010-01-08 2016-03-02 Chinese Acad Inst Acoustics Compound sound absorption device with built-in resonant cavity
FR2962586A1 (en) * 2010-07-09 2012-01-13 Airbus Operations Sas Panel for performing acoustic treatment in nacelle of aircraft, has resistive layer whose face is in contact with air flow in honeycomb structure and reflecting layer, and openings form angle with layer lower than specific degree
WO2012097998A1 (en) * 2011-01-19 2012-07-26 Rolls-Royce Deutschland Ltd & Co Kg Sound absorber for a gas turbine exhaust cone, and method for the production thereof
US8783412B2 (en) 2011-01-19 2014-07-22 Rolls-Royce Deutschland Ltd & Co Kg Sound absorber for a gas turbine exhaust cone, and method for the production thereof
DE102011120979A1 (en) * 2011-12-13 2013-06-13 Rolls-Royce Deutschland Ltd & Co Kg acoustic absorber
US8689936B2 (en) 2011-12-13 2014-04-08 Rolls-Royce Deutschland Ltd & Co Kg Acoustic absorber having conical inserts
FR2989814A1 (en) * 2012-04-20 2013-10-25 Aircelle Sa acoustic wave absorbing thin panel issued by a turbojet engine nacelle of an aircraft, and nacelle equipped with such a panel
WO2013156739A1 (en) * 2012-04-20 2013-10-24 Aircelle Thin panel for absorbing sound waves emitted by a turbofan of an aircraft nacelle, and nacelle provided with such a panel
WO2015026421A3 (en) * 2013-07-29 2015-04-09 The Boeing Company Septumization of honeycomb sandwiches
US9643392B2 (en) 2013-07-29 2017-05-09 The Boeing Company Septumization of honeycomb sandwiches
FR3065472A1 (en) * 2017-04-25 2018-10-26 Airbus Operations Sas Panel for acoustic treatment comprising an acoustically resistive porous structure having connecting channels
EP3395675A1 (en) * 2017-04-25 2018-10-31 Airbus Operations (S.A.S) Acoustic treatment panel comprising a porous, acoustically resistive structure including connecting channels

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GB2005384A (en) Multi-layer acoustic lining

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)