GB1502314A - Cellular sound absorptive structure - Google Patents

Cellular sound absorptive structure

Info

Publication number
GB1502314A
GB1502314A GB13235/75A GB1323575A GB1502314A GB 1502314 A GB1502314 A GB 1502314A GB 13235/75 A GB13235/75 A GB 13235/75A GB 1323575 A GB1323575 A GB 1323575A GB 1502314 A GB1502314 A GB 1502314A
Authority
GB
United Kingdom
Prior art keywords
waveguides
sound
embodiment shown
sheet
wall 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
GB13235/75A
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.)
Lockheed Corp
Original Assignee
Lockheed Aircraft Corp
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
Priority claimed from US458676A external-priority patent/US3913702A/en
Application filed by Lockheed Aircraft Corp filed Critical Lockheed Aircraft Corp
Priority to AU12520/76A priority Critical patent/AU1252076A/en
Publication of GB1502314A publication Critical patent/GB1502314A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered 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
    • B32B3/10—Layered 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
    • B32B3/12—Layered 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENTS OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D33/00—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for
    • B64D33/04—Arrangements in aircraft of power plant parts or auxiliaries not otherwise provided for of exhaust outlets or jet pipes
    • B64D33/06—Silencing exhaust or propulsion jets
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/10—Properties of the layers or laminate having particular acoustical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2607/00—Walls, panels

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Building Environments (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Pipe Accessories (AREA)

Abstract

1502314 Sound insulation LOCKHEED AIR. CRAFT CORP 1 April 1975 [8 April 1974] 13235/75 Heading F2X [Also in Divisions B4-B5] A sound absorbing panel comprises first and second waveguide arrays located side-by-side and each comprising a plurality of side-by-side acoustical waveguides of non-uniform length and having adjacent open ends defining the sound receiving end of the array, the open ends of the first and second waveguide arrays lying in a common geometric surface, the soundreceiving ends of like waveguides in each of said first and second arrays being spaced from each other by a distance not more than approximately the resonant wavelength of those waveguides divided by the square root of pi, and waveguide terminating means so disposed with respect to the waveguides at the ends thereof opposite the open ends as to result in an array of waveguides having lengths corresponding to different resonant frequencies. The embodiment shown in Fig. 1 comprises a fine honeycomb core structure 1 having proximate bundles of waveguides each terminated at the closed ends by an oblique partition 2, each operative unit being enclosed by wall members 3-6, the bundle of waveguides being cut obliquely to vary the effective lengths of the waveguides along the length of the cut. The cells of the honeycomb, which may be made of plastics, paper, metal or ceramics may be of hexagonal, round, square or triangular crosssections, the group enclosure formed by wall members 3-6 being square, round, hexagonal, triangular or rectangular. The sheet 2 may be of porous or non-porous material and the walls 3 to 6 and backing sheet 7 of metallic or non- metallic material, the optional facing sheet 9 being sound-permeable, the composite structure being assembled by welding, adhesive bonding or mechanical interlocking. The embodiment shown in Fig. 2, comprises a non-porous backing sheet 11, a sound transparent facing sheet 12, cell-enclosing walls 13 and 14 and reflective terminating partition 17 enclosed between the upper 15 and lower 16 sections of a cut honeycomb core. The embodiment shown in Fig. 3 comprises wall members 18 and 19, upper 21 and lower 22 honeycomb sections separated by sound relective partition 23 and sound transparent sheets 24 and 25.
GB13235/75A 1974-04-08 1975-04-01 Cellular sound absorptive structure Expired GB1502314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU12520/76A AU1252076A (en) 1975-04-01 1976-03-31 Photographic film processor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US458676A US3913702A (en) 1973-06-04 1974-04-08 Cellular sound absorptive structure

Publications (1)

Publication Number Publication Date
GB1502314A true GB1502314A (en) 1978-03-01

Family

ID=23821679

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13235/75A Expired GB1502314A (en) 1974-04-08 1975-04-01 Cellular sound absorptive structure

Country Status (9)

Country Link
JP (1) JPS6014359B2 (en)
BE (1) BE827666A (en)
CA (1) CA1051351A (en)
DE (1) DE2515127C2 (en)
FR (1) FR2266929B1 (en)
GB (1) GB1502314A (en)
IL (1) IL47021A (en)
IT (1) IT1035218B (en)
SE (1) SE405134B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140270A1 (en) * 1981-10-10 1983-04-28 Autoflug Gmbh, 2084 Rellingen Motor vehicle frame part with belt retractor and tensioning device
GB2252075A (en) * 1991-01-22 1992-07-29 Short Brothers Plc Structural cellular component
EP0935235A2 (en) * 1998-02-06 1999-08-11 EUROCOPTER DEUTSCHLAND GmbH Sandwich-type wall
CN110473510A (en) * 2019-07-31 2019-11-19 中国船舶重工集团公司第七一四研究所 A kind of structure cell and return air sound arrester based on phonon crystal
CN112002300A (en) * 2020-10-12 2020-11-27 株洲时代新材料科技股份有限公司 Broadband resonance sound absorption method and structure

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE3020849A1 (en) * 1980-06-02 1981-12-17 Messerschmitt-Bölkow-Blohm GmbH, 8000 München SCREENS WITH RESONATORS, IN PARTICULAR SILATORS
DE4011705A1 (en) * 1990-04-11 1991-10-17 Freudenberg Carl Fa AIR SOUND ABSORBING MOLDED PART
DE4415983C2 (en) † 1994-05-06 1998-02-19 Continental Ag Device to be attached to the wheel arch of a motor vehicle and acting as a passive sound absorber
DE19841975B4 (en) * 1998-09-14 2004-02-12 Continental Aktiengesellschaft Sound absorbing plate
DE10001932A1 (en) * 2000-01-19 2001-08-02 Kautex Textron Gmbh & Co Kg Cladding element
US6918740B2 (en) * 2003-01-28 2005-07-19 Dresser-Rand Company Gas compression apparatus and method with noise attenuation
JP2013015118A (en) * 2011-07-06 2013-01-24 Toyota Boshoku Corp Sound absorbing structure
DE102013000691A1 (en) * 2013-01-15 2014-07-17 Kai Klinder Sound absorbing hollow cavity has main portion that is provided with honeycomb structure with extremely thin inner walls and damping element

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3166149A (en) * 1965-01-19 Damped-resonator acoustical panels
US3831710A (en) * 1973-01-24 1974-08-27 Lockheed Aircraft Corp Sound absorbing panel

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140270A1 (en) * 1981-10-10 1983-04-28 Autoflug Gmbh, 2084 Rellingen Motor vehicle frame part with belt retractor and tensioning device
GB2252075A (en) * 1991-01-22 1992-07-29 Short Brothers Plc Structural cellular component
GB2252075B (en) * 1991-01-22 1994-10-19 Short Brothers Plc Noise Attenuation Panel
EP0935235A2 (en) * 1998-02-06 1999-08-11 EUROCOPTER DEUTSCHLAND GmbH Sandwich-type wall
EP0935235A3 (en) * 1998-02-06 2001-11-14 EUROCOPTER DEUTSCHLAND GmbH Sandwich-type wall
CN110473510A (en) * 2019-07-31 2019-11-19 中国船舶重工集团公司第七一四研究所 A kind of structure cell and return air sound arrester based on phonon crystal
CN112002300A (en) * 2020-10-12 2020-11-27 株洲时代新材料科技股份有限公司 Broadband resonance sound absorption method and structure

Also Published As

Publication number Publication date
AU7988375A (en) 1976-10-14
CA1051351A (en) 1979-03-27
IT1035218B (en) 1979-10-20
IL47021A (en) 1977-11-30
JPS50138615A (en) 1975-11-05
SE7503813L (en) 1975-10-09
FR2266929B1 (en) 1980-04-25
FR2266929A1 (en) 1975-10-31
SE405134B (en) 1978-11-20
JPS6014359B2 (en) 1985-04-12
IL47021A0 (en) 1975-06-25
DE2515127A1 (en) 1975-10-16
DE2515127C2 (en) 1986-04-30
BE827666A (en) 1975-10-08

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee