GB949503A - Noise attenuating method and apparatus - Google Patents

Noise attenuating method and apparatus

Info

Publication number
GB949503A
GB949503A GB33053/60A GB3305360A GB949503A GB 949503 A GB949503 A GB 949503A GB 33053/60 A GB33053/60 A GB 33053/60A GB 3305360 A GB3305360 A GB 3305360A GB 949503 A GB949503 A GB 949503A
Authority
GB
United Kingdom
Prior art keywords
region
passageway
equal
exit section
cell units
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
GB33053/60A
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.)
Industrial Acoustics Co Inc
Original Assignee
Industrial Acoustics Co Inc
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
Application filed by Industrial Acoustics Co Inc filed Critical Industrial Acoustics Co Inc
Publication of GB949503A publication Critical patent/GB949503A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
    • B64F1/00—Ground or aircraft-carrier-deck installations
    • B64F1/26—Ground or aircraft-carrier-deck installations for reducing engine or jet noise; Protecting airports from jet erosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/10—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling in combination with sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
    • F02K1/78—Other construction of jet pipes
    • F02K1/82—Jet pipe walls, e.g. liners
    • F02K1/827—Sound absorbing structures or liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0027—Pulsation and noise damping means
    • F04B39/005—Pulsation and noise damping means with direct action on the fluid flow using absorptive materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/664—Sound attenuation by means of sound absorbing material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/027—Throttle passages
    • F16L55/02754—Throttle passages using a central core throttling the passage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/15—Plurality of resonance or dead chambers
    • F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/20—Chambers being formed inside the exhaust pipe without enlargement of the cross section of the pipe, e.g. resonance chambers

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Duct Arrangements (AREA)
  • Exhaust Silencers (AREA)
  • Pipe Accessories (AREA)

Abstract

949,503. Exhaust silencers. INDUSTRIAL ACOUSTICS CO. Inc. Sept. 26, 1960 [Oct. 6, 1959], No. 33053/60. Heading F1B. An acoustic attenuating duct comprises at least two opposing and generally mutually parallel cell units 30, 31, which are contoured and spaced to provide a constricted region I in the passageway 15, at least one of the units tapering away from the other unit to define a divergent and truncated exit section X having an included angle greater than 7 degrees in the passageway. The hollow interiors of the cell units may be filled or lined with a sound absorbent material such as glass fibre 35. Perforations 36 may cover entrance region E, intermediate region I and exit section X and may also be provided on trailing surfaces 37, 38. The surfaces in the entrance region E may be imperforate and convex or straight with flared leading and trailing edges. Ducts can be arranged in series or in parallel. Dimension wa may be equal to “ of the attenuated frequency, ws is less than 2 wa and r is equal to wa. The perimeter area ratio in the region I may be greater than 5/6.
GB33053/60A 1959-10-06 1960-09-26 Noise attenuating method and apparatus Expired GB949503A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US844787A US3033307A (en) 1959-10-06 1959-10-06 Noise attenuating apparatus

Publications (1)

Publication Number Publication Date
GB949503A true GB949503A (en) 1964-02-12

Family

ID=25293630

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33053/60A Expired GB949503A (en) 1959-10-06 1960-09-26 Noise attenuating method and apparatus

Country Status (3)

Country Link
US (1) US3033307A (en)
FR (1) FR1268345A (en)
GB (1) GB949503A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2108344A5 (en) * 1970-09-22 1972-05-19 Sound Attenuators Ltd
FR2442970A1 (en) * 1978-12-01 1980-06-27 Gen Electric APPARATUS AND METHOD FOR SUPPRESSING LOW FREQUENCY INTERNAL NOISE IN A GAS TURBINE ENGINE
GB2231916A (en) * 1989-05-12 1990-11-28 Sound Attenuators Ltd Gas flow silencer

Families Citing this family (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3511336A (en) * 1969-06-10 1970-05-12 Rink Corp Sound attenuator for air flow
US4287962A (en) * 1977-11-14 1981-09-08 Industrial Acoustics Company Packless silencer
CA1137877A (en) * 1977-11-14 1982-12-21 Martin Hirschorn Packless silencer
US4371054A (en) * 1978-03-16 1983-02-01 Lockheed Corporation Flow duct sound attenuator
US4316522A (en) * 1979-11-07 1982-02-23 Industrial Acoustics Company, Inc. Acoustic filter silencer
US4266602A (en) * 1980-02-21 1981-05-12 Westinghouse Electric Corp. Heat exchanger for cooling electrical power apparatus
US4421455A (en) * 1981-12-22 1983-12-20 The Garrett Corporation Duct lining
US4508486A (en) * 1982-05-28 1985-04-02 Peabody Abc Corporation Ventilation fan with noise-attenuating housing
JPH0370932A (en) * 1989-08-08 1991-03-26 Mitsubishi Electric Home Appliance Co Ltd Muffler
US5650599A (en) * 1993-04-13 1997-07-22 Northrop Grumman Corporation Noise cancellation method and apparatus
US5663535A (en) * 1995-08-28 1997-09-02 Venturedyne, Ltd. Sound attenuator for HVAC systems
US6116375A (en) * 1995-11-16 2000-09-12 Lorch; Frederick A. Acoustic resonator
CA2164370A1 (en) * 1995-12-04 1997-06-05 Donald L. Allen Reactive acoustic silencer
DE19803161C2 (en) * 1998-01-28 2000-03-16 Alstom Energy Syst Gmbh Gas turbine silencer with diffuser
FR2787513B1 (en) * 1998-12-17 2001-01-19 Turbomeca MULTICHANNEL EXHAUST DEVICE FOR ACOUSTICALLY TREATED TURBOMACHINE
US7210653B2 (en) * 2002-10-22 2007-05-01 The Boeing Company Electric-based secondary power system architectures for aircraft
US6920959B2 (en) * 2003-05-30 2005-07-26 M & I Heat Transfer Products Ltd. Inlet and outlet duct units for air supply fan
EP1524415A1 (en) * 2003-10-15 2005-04-20 Zeuna-Stärker Gmbh & Co Kg Exhaust silencer
US7197881B2 (en) * 2004-03-25 2007-04-03 Honeywell International, Inc. Low loss flow limited feed duct
DE102004038188A1 (en) * 2004-08-06 2006-03-16 Robert Bosch Gmbh Sound damping device, in particular for a heater
US7267297B2 (en) * 2004-09-02 2007-09-11 The Boeing Company Integrated axially varying engine muffler, and associated methods and systems
US7364116B2 (en) * 2004-09-27 2008-04-29 The Boeing Company Automatic control systems for aircraft auxiliary power units, and associated methods
US7344107B2 (en) * 2004-10-26 2008-03-18 The Boeing Company Dual flow APU inlet and associated systems and methods
US7513119B2 (en) * 2005-02-03 2009-04-07 The Boeing Company Systems and methods for starting aircraft engines
EP1732062B1 (en) * 2005-06-07 2013-08-14 Alstom Technology Ltd Silencer
US7765784B2 (en) * 2006-09-25 2010-08-03 The Boeing Company Thermally compliant APU exhaust duct arrangements and associated systems and methods
WO2008113160A1 (en) * 2007-03-16 2008-09-25 E.H. Price Ltd. Single duct silencing terminal unit
US8210308B2 (en) * 2007-03-16 2012-07-03 E.H. Price Ltd. Sound attentuator
WO2008113159A1 (en) * 2007-03-16 2008-09-25 E.H. Price Ltd. Fan powered silencing terminal unit
US20080236938A1 (en) * 2007-03-30 2008-10-02 Siemens Vdo Automotive, Inc. Induction system duct with noise attenuating holes
KR20080092838A (en) * 2007-04-12 2008-10-16 가부시끼 가이샤 구보다 Vehicle with cabin
WO2009034629A1 (en) * 2007-09-13 2009-03-19 Alphatech Co., Ltd. Intake silencer for gas turbine
SE532157C2 (en) * 2008-03-06 2009-11-03 Lindab Ab Noise-canceling baffle and baffle arrangement
US8061961B2 (en) * 2009-01-23 2011-11-22 Dresser-Rand Company Fluid expansion device and method with noise attenuation
US7984787B2 (en) * 2009-01-23 2011-07-26 Dresser-Rand Company Fluid-carrying conduit and method with noise attenuation
US8657227B1 (en) 2009-09-11 2014-02-25 The Boeing Company Independent power generation in aircraft
CN102454436A (en) * 2010-10-20 2012-05-16 上海圣丰环保设备有限公司 Combined turbine-high pressure water pump sound insulation and reduction ventilation hood
DE102010062074A1 (en) * 2010-11-26 2012-05-31 Bbm Akustik Technologie Gmbh Silencing element for gas flow channel, has each outflow profile having apertures through which gas stream flows around silencing element, so that resonator is formed for attenuation of sound in gas stream in certain frequency ranges
US8738268B2 (en) 2011-03-10 2014-05-27 The Boeing Company Vehicle electrical power management and distribution
US20140037441A1 (en) * 2012-08-06 2014-02-06 Eric Chrabascz Ram air fan diffuser
US9305539B2 (en) 2013-04-04 2016-04-05 Trane International Inc. Acoustic dispersing airflow passage
GB2528950A (en) 2014-08-06 2016-02-10 Aaf Ltd Sound suppression apparatus
JP6671469B2 (en) * 2016-05-20 2020-03-25 三菱電機株式会社 Centrifugal blower, air conditioner and refrigeration cycle device
CN108443232A (en) * 2017-02-16 2018-08-24 中兴通讯股份有限公司 A kind of denoising structure and cabinet
US10928096B2 (en) * 2017-06-30 2021-02-23 Robert Bosch Llc Environmental control unit including noise reduction features
DE102018121855A1 (en) * 2018-09-07 2020-03-12 Vaillant Gmbh Ventilation system
US11592205B2 (en) * 2018-12-18 2023-02-28 Johnson Controls Tyco IP Holdings LLP Silencer assembly for air handling unit of an HVAC system
US11204204B2 (en) * 2019-03-08 2021-12-21 Toyota Motor Engineering & Manufacturing North America, Inc. Acoustic absorber with integrated heat sink
US11446980B2 (en) * 2020-06-10 2022-09-20 Denso International America, Inc. HVAC system noise control
US11898771B2 (en) * 2020-06-11 2024-02-13 Johnson Controls Technology Company Sound attenuator for a terminal unit
RU200755U1 (en) * 2020-06-18 2020-11-11 Акционерное общество "ТРАНСМАШХОЛДИНГ" PASSIVE SILENCER FOR AIR-CONDITIONING AND VENTILATION FOR PASSENGER CARS OF RAILWAY TRANSPORT

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519160A (en) * 1942-12-05 1950-08-15 Belle Weather Inc Testing apparatus with sound absorbing panels forming air passages
US2519161A (en) * 1946-07-18 1950-08-15 Thomas T Tucker Acoustic testing structure, including sound absorbing panels
US2519162A (en) * 1948-03-15 1950-08-15 Thomas T Tucker Acoustic testing structure including sound absorbing panels
US2916101A (en) * 1957-02-25 1959-12-08 Israel A Naman Sound-absorbing structures

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2108344A5 (en) * 1970-09-22 1972-05-19 Sound Attenuators Ltd
FR2442970A1 (en) * 1978-12-01 1980-06-27 Gen Electric APPARATUS AND METHOD FOR SUPPRESSING LOW FREQUENCY INTERNAL NOISE IN A GAS TURBINE ENGINE
GB2231916A (en) * 1989-05-12 1990-11-28 Sound Attenuators Ltd Gas flow silencer
GB2231916B (en) * 1989-05-12 1993-11-17 Sound Attenuators Ltd Acoustic attenuators.

Also Published As

Publication number Publication date
US3033307A (en) 1962-05-08
FR1268345A (en) 1961-07-28

Similar Documents

Publication Publication Date Title
GB949503A (en) Noise attenuating method and apparatus
JPS56159455A (en) Apparatus for attenuating and absorbing sound in room
ATE166992T1 (en) HYBRID ACTIVE SILENCER
GB1513030A (en) Sound wave suppressing panel for use with an exhaust duct
GB1259193A (en)
FR1246694A (en) Panel and similar device with high sound transmission loss
JPS5241541A (en) Input-output equipment for optical fibers
FR2348429A1 (en) SLIDE SILENCER
GB1184828A (en) Improvements in or relating to Sound Attenuating Units
GB614404A (en) Improvements in or relating to means for reducing the sound effect of the passage of air or other gases through conduits
ES291106A1 (en) Sound-absorbing ceiling with interchangeable panels for absorbing different frequencies
GB495755A (en) Silencing equipment for air, heating, ventilating, and exhaust ducts, tunnels or the like, and sound treatment for rooms
GB902654A (en) Noise suppression apparatus
Franken et al. Sound propagation into a moving medium
JPS52134139A (en) Muffling device
GB636676A (en) Means for sound absorption in straight or bent ducts for the passage of air or other gases
SE8406282L (en) MUTOR FOR REDUCING CHANNEL-AIR AIR
FR1261988A (en) Improvements in methods of constructing conduits, ducts and the like
ROSKAM et al. A research to reduce interior noise in general aviation airplanes. General aviation interior noise study[Progress Report]
GB902441A (en) Improvements in and relating to sound absorbing apparatus
GB683534A (en) Improvements in or relating to refractors for compressional waves
GB911999A (en) Acoustic duct and panel construction therefore
GB1214358A (en) Sound absorbing device
AU275228B2 (en) Combination acoustic ceiling panel and air deffuser
GB495699A (en) Silencing equipment for air, heating, ventilating, and exhaust ducts, tunnels or the like, and sound treatment for rooms