GB1490923A - Sound-absorbing structures - Google Patents

Sound-absorbing structures

Info

Publication number
GB1490923A
GB1490923A GB2660675A GB2660675A GB1490923A GB 1490923 A GB1490923 A GB 1490923A GB 2660675 A GB2660675 A GB 2660675A GB 2660675 A GB2660675 A GB 2660675A GB 1490923 A GB1490923 A GB 1490923A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
sheet
facing
intermediate
porous
members
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.)
Expired
Application number
GB2660675A
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.)
SHORT BROTHERS AND HARLAND Ltd
Original Assignee
SHORT BROTHERS AND HARLAND Ltd
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

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00Layered 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
    • B32B3/10Layered 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
    • B32B3/12Layered 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00Layered products comprising a layer of metal
    • B32B15/14Layered products comprising a layer of metal next to a fibrous or filamentary layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00Layered 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
    • B32B3/26Layered 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
    • B32B3/266Layered 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00Layered 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
    • B32B5/02Layered 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
    • B32B5/022Non-woven fabric
    • 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
    • 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/50Properties of the layers or laminate having particular mechanical properties
    • B32B2307/56Damping, energy absorption

Abstract

1490923 Sand insulation SHORT BROS & HARLAND Ltd 21 June 1976 [23 June 1975] 26606/75 Heading F2X [Also in Divisions B5 and F1] A sand absorbing structure comprises a porous facing sheet 20 and a non-porous backing sheet 21 with a core structure 22 connecting the facing and backing sheets and forming with the facing and backing sheets a plurality of side-byside resonating chambers, and intermediate porous members 25 each dividing an associated one of the chambers into two cells 23, 24, the intermediate porous members being so constructed and arranged that adjacent intermediate members or adjacent groups of intermediate members have differing porosities to cause adjacent associated chambers or groups of chambers to absorb sounds of differing ranges of frequencies. The porosity of the intermediate members may be constant in one direction parallel to the facing sheet but vary in a second direction parallel to the facing sheet but normal to the one direction. Facing and backing sheets 20 and 21 may be of metallic material. Intermediate porous member 25 may be a perforate sheet, the porosity being varied by variation of the size of the perforations and/or by variation of the number of perforations per unit area of the sheet. A porous sheet of woven or non- woven organic or inorganic fibres may overlie and be bonded or welded to facing sheet 20 or intermediate sheet 25. The facing and intermediate sheets may also be sheets of woven or non-woven organic or inorganic fibres with the fibres providing variable porosity. The porosity of facing sheet 20 whether of metal or fibres may be varied to accommodate variations in ambient conditions. The sound absorbing structure may be used to line at least one of the ducts of a gas turbine engine and may be of annular configuration. In alternative arrangements the backing sheet is conical and is inclined to the facing sheet and intermediate sheet so that the intermediate sheet divides the chamber in different proportions.
GB2660675A 1975-06-23 1975-06-23 Sound-absorbing structures Expired GB1490923A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2660675A GB1490923A (en) 1975-06-23 1975-06-23 Sound-absorbing structures

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB2660675A GB1490923A (en) 1975-06-23 1975-06-23 Sound-absorbing structures
DE19762627801 DE2627801A1 (en) 1975-06-23 1976-06-22 Schalldaempfungseinrichtung
FR7619134A FR2317504A1 (en) 1975-06-23 1976-06-23 sound absorbing structure and gas turbine engine comprising such a structure

Publications (1)

Publication Number Publication Date
GB1490923A true true GB1490923A (en) 1977-11-02

Family

ID=10246278

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2660675A Expired GB1490923A (en) 1975-06-23 1975-06-23 Sound-absorbing structures

Country Status (3)

Country Link
DE (1) DE2627801A1 (en)
FR (1) FR2317504A1 (en)
GB (1) GB1490923A (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0020016A1 (en) * 1979-05-23 1980-12-10 Coal Industry (Patents) Limited Acoustic liner for attenuating noise
EP0020015B1 (en) * 1979-05-23 1984-03-28 Coal Industry (Patents) Limited Acoustic liner for attenuating noise
US4540335A (en) * 1980-12-02 1985-09-10 Mitsubishi Jukogyo Kabushiki Kaisha Controllable-pitch moving blade type axial fan
EP0413987A2 (en) * 1989-08-23 1991-02-27 GEBHARDT VENTILATOREN GMBH & CO. Axial fan
GB2252076A (en) * 1991-01-22 1992-07-29 Short Brothers Plc Noise attenuation panel
GB2364366A (en) * 2000-06-30 2002-01-23 Short Brothers Plc A noise attenuation panel
EP1217605A1 (en) * 2000-12-21 2002-06-26 AIRBUS FRANCE (Société par Actions Simplifiée) Method of manufacturing a panel with a protected acoustic sound damping layer and acoustic panel thereby created
EP1239454A1 (en) * 2001-03-09 2002-09-11 Airbus France Method of manufacturing a panel with an adapted, acoustically resistive layer and resulting panel
GB2391059A (en) * 2000-06-30 2004-01-28 Short Brothers Plc A noise attenuation panel
US7311175B2 (en) 2005-08-10 2007-12-25 United Technologies Corporation Acoustic liner with bypass cooling
US7401682B2 (en) 2005-08-10 2008-07-22 United Technologies Corporation Architecture for an acoustic liner
EP1548229A3 (en) * 2003-12-22 2009-08-05 United Technologies Corporation Airfoil surface impedance modification for noise reduction in turbofan engines
GB2459844A (en) * 2008-05-06 2009-11-11 Rolls Royce Plc Turbofan engine casing liner panel
JP2010526231A (en) * 2007-04-30 2010-07-29 エアバス フランス Acoustic characteristics are variable acoustic panel
WO2011086273A1 (en) * 2009-12-22 2011-07-21 Airbus Operations Sas Acoustic treatment panel having scalable thickness
WO2013084135A1 (en) * 2011-12-09 2013-06-13 Alenia Aermacchi S.Pa. Element for sound absorption mounted on aircraft components
GB2527644A (en) * 2014-04-30 2015-12-30 Boeing Co Methods and apparatus for noise attenuation in an engine nacelle
US9656761B2 (en) 2014-04-30 2017-05-23 The Boeing Company Lipskin for a nacelle and methods of making the same
US9708072B2 (en) 2014-04-30 2017-07-18 The Boeing Company Aircraft engine nacelle bulkheads and methods of assembling the same
US9938852B2 (en) 2014-04-30 2018-04-10 The Boeing Company Noise attenuating lipskin assembly and methods of assembling the same

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2710383C3 (en) * 1977-03-10 1984-03-22 Zink Gmbh & Co Kg, 7121 Cleebronn, De
US4265955A (en) * 1978-05-01 1981-05-05 The Boeing Company Honeycomb core with internal septum and method of making same
GB2038410B (en) * 1978-12-27 1982-11-17 Rolls Royce Acoustic lining utilising resonance
GB2076049B (en) * 1980-05-17 1983-10-26 Rolls Royce Variable acoustic impedance lining
US4645032A (en) * 1985-09-05 1987-02-24 The Garrett Corporation Compact muffler apparatus and associated methods
JP2888634B2 (en) * 1989-11-08 1999-05-10 ロイアル・オードナンス・ピー・エル・シー Effective composite material for the protection of aircraft structures
US5160248A (en) * 1991-02-25 1992-11-03 General Electric Company Fan case liner for a gas turbine engine with improved foreign body impact resistance
US7984787B2 (en) * 2009-01-23 2011-07-26 Dresser-Rand Company Fluid-carrying conduit and method with noise attenuation
FR3028886A1 (en) * 2014-11-24 2016-05-27 Snecma Body for jet engine fan noise reduction
DE202015004064U1 (en) 2015-06-10 2015-09-18 Akustikbüro Krämer + Stegmaier GmbH A device for reducing sound pressure levels

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE554083A (en) * 1956-02-18
GB899685A (en) * 1959-12-29 1962-06-27 Bolt Beranek & Newman Sound-absorbing member, e.g., for ducts
US3734234A (en) * 1971-11-08 1973-05-22 Lockheed Aircraft Corp Sound absorption structure
FR2300384A1 (en) * 1975-02-07 1976-09-03 Lockheed Aircraft Corp Sound absorbing panel effective in two frequency domains - combines action of Helm holtz resonator with that of laminar honeycomb absorber

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0020015B1 (en) * 1979-05-23 1984-03-28 Coal Industry (Patents) Limited Acoustic liner for attenuating noise
EP0020016A1 (en) * 1979-05-23 1980-12-10 Coal Industry (Patents) Limited Acoustic liner for attenuating noise
US4540335A (en) * 1980-12-02 1985-09-10 Mitsubishi Jukogyo Kabushiki Kaisha Controllable-pitch moving blade type axial fan
EP0413987A2 (en) * 1989-08-23 1991-02-27 GEBHARDT VENTILATOREN GMBH & CO. Axial fan
EP0413987A3 (en) * 1989-08-23 1991-09-25 Gebhardt Ventilatoren Gmbh & Co. Axial fan
GB2252076A (en) * 1991-01-22 1992-07-29 Short Brothers Plc Noise attenuation panel
GB2252076B (en) * 1991-01-22 1994-11-09 Short Brothers Plc Noise attenuation panel
GB2364366B (en) * 2000-06-30 2003-12-03 Short Brothers Plc A noise attenuation panel
US6827180B2 (en) 2000-06-30 2004-12-07 Short Brothers Plc Noise attenuation panel
GB2391059B (en) * 2000-06-30 2005-02-16 Short Brothers Plc A noise attenuation panel
GB2391059A (en) * 2000-06-30 2004-01-28 Short Brothers Plc A noise attenuation panel
GB2364366A (en) * 2000-06-30 2002-01-23 Short Brothers Plc A noise attenuation panel
US6609592B2 (en) 2000-06-30 2003-08-26 Short Brothers Plc Noise attenuation panel
EP1217605A1 (en) * 2000-12-21 2002-06-26 AIRBUS FRANCE (Société par Actions Simplifiée) Method of manufacturing a panel with a protected acoustic sound damping layer and acoustic panel thereby created
US7257894B2 (en) 2000-12-21 2007-08-21 Airbus France Process for making a panel with a protected acoustic damping layer
FR2818581A1 (en) * 2000-12-21 2002-06-28 Eads Airbus Sa Process for manufacturing a panel is protected acoustic damping layer and acoustic panel thus obtained
US6820337B2 (en) 2000-12-21 2004-11-23 Airbus France Process for making a panel with a protected acoustic damping layer and acoustic panel as made
FR2821788A1 (en) * 2001-03-09 2002-09-13 Eads Airbus Sa Process for manufacturing a panel adapted acoustic resistive layer and acoustic panel thus obtained
US6755280B2 (en) 2001-03-09 2004-06-29 Airbus France Method for producing a panel comprising an adapted acoustically resistive layer and panel so obtained
EP1239454A1 (en) * 2001-03-09 2002-09-11 Airbus France Method of manufacturing a panel with an adapted, acoustically resistive layer and resulting panel
EP1548229A3 (en) * 2003-12-22 2009-08-05 United Technologies Corporation Airfoil surface impedance modification for noise reduction in turbofan engines
US7311175B2 (en) 2005-08-10 2007-12-25 United Technologies Corporation Acoustic liner with bypass cooling
US7401682B2 (en) 2005-08-10 2008-07-22 United Technologies Corporation Architecture for an acoustic liner
RU2467191C2 (en) * 2007-04-30 2012-11-20 Эрбюс Франс Aircraft gondola with acoustical board having variable acoustic property
JP2010526231A (en) * 2007-04-30 2010-07-29 エアバス フランス Acoustic characteristics are variable acoustic panel
US7963362B2 (en) 2007-04-30 2011-06-21 Airbus Operations Sas Acoustic panel having a variable acoustic characteristic
GB2459844B (en) * 2008-05-06 2011-01-19 Rolls Royce Plc Fan section
GB2459844A (en) * 2008-05-06 2009-11-11 Rolls Royce Plc Turbofan engine casing liner panel
US8578697B2 (en) 2008-05-06 2013-11-12 Rolls-Royce Plc Fan section
CN102686481A (en) * 2009-12-22 2012-09-19 空中客车运营简化股份公司 Acoustic treatment panel having scalable thickness
CN102686481B (en) * 2009-12-22 2016-01-13 空中客车运营简化股份公司 An aircraft comprising a cabin air inlet
US8505679B2 (en) 2009-12-22 2013-08-13 Airbus Operations Sas Panel for the acoustic treatment with a progressive thickness
WO2011086273A1 (en) * 2009-12-22 2011-07-21 Airbus Operations Sas Acoustic treatment panel having scalable thickness
WO2013084135A1 (en) * 2011-12-09 2013-06-13 Alenia Aermacchi S.Pa. Element for sound absorption mounted on aircraft components
US9994302B2 (en) 2011-12-09 2018-06-12 Alenia Aermacchi S.P.A. Element for sound absorption mounted on aircraft components
GB2527644B (en) * 2014-04-30 2016-08-31 Boeing Co Methods and apparatus for noise attenuation in an engine nacelle
GB2537063A (en) * 2014-04-30 2016-10-05 Boeing Co Methods and apparatus for noise attenuation in an engine nacelle
US9604438B2 (en) 2014-04-30 2017-03-28 The Boeing Company Methods and apparatus for noise attenuation in an engine nacelle
US9656761B2 (en) 2014-04-30 2017-05-23 The Boeing Company Lipskin for a nacelle and methods of making the same
US9708072B2 (en) 2014-04-30 2017-07-18 The Boeing Company Aircraft engine nacelle bulkheads and methods of assembling the same
GB2537063B (en) * 2014-04-30 2018-03-28 Boeing Co Methods and apparatus for noise attenuation in an engine nacelle
US9938852B2 (en) 2014-04-30 2018-04-10 The Boeing Company Noise attenuating lipskin assembly and methods of assembling the same
GB2527644A (en) * 2014-04-30 2015-12-30 Boeing Co Methods and apparatus for noise attenuation in an engine nacelle

Also Published As

Publication number Publication date Type
DE2627801A1 (en) 1977-01-13 application
FR2317504A1 (en) 1977-02-04 application

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee