GB1456018A - Active control of sound waves - Google Patents

Active control of sound waves

Info

Publication number
GB1456018A
GB1456018A GB5437072A GB5437072A GB1456018A GB 1456018 A GB1456018 A GB 1456018A GB 5437072 A GB5437072 A GB 5437072A GB 5437072 A GB5437072 A GB 5437072A GB 1456018 A GB1456018 A GB 1456018A
Authority
GB
United Kingdom
Prior art keywords
sound
sources
attenuated
sound waves
microphones
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
GB5437072A
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.)
NAT RES DEV
National Research Development Corp UK
Original Assignee
NAT RES DEV
National Research Development Corp UK
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 NAT RES DEV, National Research Development Corp UK filed Critical NAT RES DEV
Priority to GB5437072A priority Critical patent/GB1456018A/en
Priority to FR7341862A priority patent/FR2208573A5/fr
Priority to DE2358436A priority patent/DE2358436A1/en
Priority to JP48132110A priority patent/JPS4997601A/ja
Priority to US05/607,462 priority patent/US4044203A/en
Publication of GB1456018A publication Critical patent/GB1456018A/en
Priority to HK469/80A priority patent/HK46980A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F16L55/033—Noise absorbers
    • F16L55/0333—Noise absorbers by means of an active system
    • 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
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • 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
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations
    • G10K11/17873—General system configurations using a reference signal without an error signal, e.g. pure feedforward
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2200/00—Mathematical features
    • F05D2200/10—Basic functions
    • F05D2200/11—Sum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/30—Application in turbines
    • F05D2220/32—Application in turbines in gas turbines
    • F05D2220/323—Application in turbines in gas turbines for aircraft propulsion, e.g. jet engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/96—Preventing, counteracting or reducing vibration or noise
    • F05D2260/962—Preventing, counteracting or reducing vibration or noise by means of "anti-noise"
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/107—Combustion, e.g. burner noise control of jet engines
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/109—Compressors, e.g. fans
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/112—Ducts
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1281—Aircraft, e.g. spacecraft, airplane or helicopter
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3011—Single acoustic input
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3042—Parallel processing
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3046—Multiple acoustic inputs, multiple acoustic outputs
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3219—Geometry of the configuration
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3229—Transducers
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/50—Miscellaneous
    • G10K2210/506—Feedback, e.g. howling

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Exhaust Silencers (AREA)

Abstract

1456018 Sound wave attenuation by interference NATIONAL RESEARCH DEVELOPMENT CORP 15 Nov 1973 [24 Nov 1972] 54370/72 Headings FIB, FIG and F1J Apparatus for attenuating sound waves propagating in a duct, e.g. of a jet engine, Fig. 10, comprises an array of sound sources 11, 11a, 11b or 13, 13a, 13b longitudinally spaced relative to the axis of propagation of the sound waves to be attenuated the sources being adjacent the duct walls and the arrangement being such that the resultant of the generated sound waves propagating along the duct in one direction interferes destructively with the sound wave to be attenuated and the resultant of the generated sound waves propagating in the opposite direction is negligible. Detectors 12, 12a, 12b (each consisting of three or four microphones distributed around the duct) detect the sound to be attenuated and by means of an amplifying and delay unit cause signals to energize the sources 11, 11a, 11b (each consisting of three or four loudspeakers). The arrangement of speakers is such as to propagate sound of a particular frequency only towards the inlet orifice of the engine shown, this sound interfering destructively with the sound from the engine. The arrangement of the microphones is the same as that of the loudspeakers so that the microphones are not subject to positive feedback and respond only to the sound wave to be attenuated. At the rear of the engine are detectors 14, 14a, 14b and sources 13, 13a, 13b, comprising microphones and loudspeakers respectively, which behave similarly. In Fig. 11, a rectangular cross-section silencer 22 has sound detectors 23, 23', 23" coupled via amplifying and delay circuitry 25 to loudspeaker sources 24, 24', 24" to produce sound waves to interfere destructively with sound propagated along the silencer 22 from a jet engine 21.
GB5437072A 1972-11-24 1972-11-24 Active control of sound waves Expired GB1456018A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB5437072A GB1456018A (en) 1972-11-24 1972-11-24 Active control of sound waves
FR7341862A FR2208573A5 (en) 1972-11-24 1973-11-23
DE2358436A DE2358436A1 (en) 1972-11-24 1973-11-23 METHOD OF ATTENUATING A SOUND FIELD PROPAGATING ALONG A GUIDE
JP48132110A JPS4997601A (en) 1972-11-24 1973-11-24
US05/607,462 US4044203A (en) 1972-11-24 1975-08-25 Active control of sound waves
HK469/80A HK46980A (en) 1972-11-24 1980-08-28 Active control of sound waves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5437072A GB1456018A (en) 1972-11-24 1972-11-24 Active control of sound waves

Publications (1)

Publication Number Publication Date
GB1456018A true GB1456018A (en) 1976-11-17

Family

ID=10470785

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5437072A Expired GB1456018A (en) 1972-11-24 1972-11-24 Active control of sound waves

Country Status (5)

Country Link
JP (1) JPS4997601A (en)
DE (1) DE2358436A1 (en)
FR (1) FR2208573A5 (en)
GB (1) GB1456018A (en)
HK (1) HK46980A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117046A (en) * 1982-03-17 1983-10-05 Deutsche Forsch Luft Raumfahrt Silencing in fluid flow impelling systems
US4669122A (en) * 1984-06-21 1987-05-26 National Research Development Corporation Damping for directional sound cancellation
GB2191606A (en) * 1986-04-28 1987-12-16 Rolls Royce Plc Active control of unsteady motion phenomena in turbomachinery
GB2204916A (en) * 1987-05-19 1988-11-23 British Gas Plc Gaseous flow silencer
US4967550A (en) * 1987-04-28 1990-11-06 Rolls-Royce Plc Active control of unsteady motion phenomena in turbomachinery
WO1997016816A1 (en) * 1995-10-30 1997-05-09 Technofirst Active acoustic attenuation device for use in a duct, particularly for soundproofing a ventilation and/or air-conditioning network
WO1997020307A1 (en) * 1995-11-30 1997-06-05 Siemens Electric Limited System and method for reducing engine noise
WO2000005494A1 (en) * 1998-07-22 2000-02-03 Friedmund Nagel Device and method for actively reducing the noise emissions of jet engines and for diagnosing the same
US6308914B1 (en) 1999-03-11 2001-10-30 Gkn Westland Helicopters Limited Apparatus for the suppression of infra red emissions from an engine
EP2947649A2 (en) * 2014-05-22 2015-11-25 WaveScape Technologies GmbH Assembly for the reduction of sound
GB2582189A (en) * 2019-03-12 2020-09-16 Toshiba Kk System for reducing interference noise of rotor and stator blades, and flight vehicle

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2385972A2 (en) * 1977-04-01 1978-10-27 Anvar ACTIVE ACOUSTICAL ABSORBERS FOR DUCTS
FR2386881A1 (en) * 1977-04-05 1978-11-03 Sound Attenuators Ltd Active sound attenuation using secondary wave - has stored programme used to obtain signal representing secondary wave
JPS5462509A (en) * 1977-10-27 1979-05-19 Agency Of Ind Science & Technol Blower-noise reducing method by phase control
GB8329218D0 (en) * 1983-11-02 1983-12-07 Ffowcs Williams J E Reheat combustion system for gas turbine engine
GB8405914D0 (en) * 1984-03-07 1984-04-11 Swinbanks M A Reducing noise by cancellation
JPS63140897A (en) * 1986-12-02 1988-06-13 Komatsu Ltd Transverse blower
DE4011658A1 (en) * 1990-04-11 1991-10-17 Messerschmitt Boelkow Blohm Anti-sound wave generator - incorporates at least fluidic amplifier with input and output connections
JP2972875B1 (en) 1998-06-18 1999-11-08 京都大学長 Noise reduction device for supersonic jet

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117046A (en) * 1982-03-17 1983-10-05 Deutsche Forsch Luft Raumfahrt Silencing in fluid flow impelling systems
US4669122A (en) * 1984-06-21 1987-05-26 National Research Development Corporation Damping for directional sound cancellation
GB2191606B (en) * 1986-04-28 1991-01-23 Rolls Royce Plc Active control of unsteady motion phenomena in turbomachinery
GB2191606A (en) * 1986-04-28 1987-12-16 Rolls Royce Plc Active control of unsteady motion phenomena in turbomachinery
US4967550A (en) * 1987-04-28 1990-11-06 Rolls-Royce Plc Active control of unsteady motion phenomena in turbomachinery
GB2204916B (en) * 1987-05-19 1991-10-16 British Gas Plc A silencer
GB2204916A (en) * 1987-05-19 1988-11-23 British Gas Plc Gaseous flow silencer
WO1997016816A1 (en) * 1995-10-30 1997-05-09 Technofirst Active acoustic attenuation device for use in a duct, particularly for soundproofing a ventilation and/or air-conditioning network
WO1997020307A1 (en) * 1995-11-30 1997-06-05 Siemens Electric Limited System and method for reducing engine noise
WO2000005494A1 (en) * 1998-07-22 2000-02-03 Friedmund Nagel Device and method for actively reducing the noise emissions of jet engines and for diagnosing the same
US6308914B1 (en) 1999-03-11 2001-10-30 Gkn Westland Helicopters Limited Apparatus for the suppression of infra red emissions from an engine
EP2947649A2 (en) * 2014-05-22 2015-11-25 WaveScape Technologies GmbH Assembly for the reduction of sound
GB2582189A (en) * 2019-03-12 2020-09-16 Toshiba Kk System for reducing interference noise of rotor and stator blades, and flight vehicle
GB2582189B (en) * 2019-03-12 2021-07-28 Toshiba Kk System for reducing interference noise of rotor and stator blades, and flight vehicle
US11415152B2 (en) 2019-03-12 2022-08-16 Kabushiki Kaisha Toshiba System for reducing interference noise of rotor and stator blades, and flight vehicle

Also Published As

Publication number Publication date
JPS4997601A (en) 1974-09-14
FR2208573A5 (en) 1974-06-21
HK46980A (en) 1980-09-05
DE2358436A1 (en) 1974-05-30

Similar Documents

Publication Publication Date Title
GB1456018A (en) Active control of sound waves
Ffowcs Williams Review lecture-anti-sound
US4669122A (en) Damping for directional sound cancellation
US4665549A (en) Hybrid active silencer
US4815139A (en) Active acoustic attenuation system for higher order mode non-uniform sound field in a duct
EP0040613B1 (en) Improved method and apparatus for cancelling vibration
US5363451A (en) Method and apparatus for the active reduction of compression waves
Williams Review lecture: Anti-sound
Poole et al. An experimental study of Swinbanks' method of active attenuation of sound in ducts
US4171465A (en) Active control of sound waves
CA2082890A1 (en) Multi-channel active attenuation system with error signal inputs
GB1583758A (en) Attenuation of sound waves in ducts
Hu et al. Directional cancellation of acoustic noise for home window applications
CA2233253A1 (en) Active acoustic attenuation device for use in a duct, particularly for soundproofing a ventilation and/or air-conditioning network
USH417H (en) Headset for ambient noise suppression
Gordon et al. Active noise control: A review of the field
FR2329929A1 (en) Active sound attenuator for ventilation duct - has acoustic dipole and monopole driven to cancel noise energy
Williams et al. Anti-phase noise reduction
GB1492963A (en) Preventing or reducing transmission of sound
JP3422247B2 (en) Speaker device
JPS62102290A (en) Noise reducer
JP2596127B2 (en) Electronic silencing system
EP4322154A1 (en) Canceling device
JPH05223334A (en) Active noise canceler
SU556566A1 (en) System for the study of halls

Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19931114