GB1512014A - Method of attenuating longitudinal compression waves travelling in a gas filled duct - Google Patents

Method of attenuating longitudinal compression waves travelling in a gas filled duct

Info

Publication number
GB1512014A
GB1512014A GB27679/74A GB2767974A GB1512014A GB 1512014 A GB1512014 A GB 1512014A GB 27679/74 A GB27679/74 A GB 27679/74A GB 2767974 A GB2767974 A GB 2767974A GB 1512014 A GB1512014 A GB 1512014A
Authority
GB
United Kingdom
Prior art keywords
duct
compensate
linearity
june
gas filled
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
GB27679/74A
Other languages
English (en)
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.)
University of Leeds Industrial Services Ltd
Original Assignee
University of Leeds Industrial Services 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
Application filed by University of Leeds Industrial Services Ltd filed Critical University of Leeds Industrial Services Ltd
Priority to GB27679/74A priority Critical patent/GB1512014A/en
Priority to ZA00753895A priority patent/ZA753895B/xx
Priority to NO752163A priority patent/NO752163L/no
Priority to SE7507087A priority patent/SE7507087L/xx
Priority to DE19752527642 priority patent/DE2527642A1/de
Priority to AU82325/75A priority patent/AU491349B2/en
Priority to BE157551A priority patent/BE830489A/xx
Priority to FR7519519A priority patent/FR2275722A1/fr
Publication of GB1512014A publication Critical patent/GB1512014A/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
    • F16L55/04—Devices damping pulsations or vibrations in fluids
    • 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
    • G10K11/1781—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17813—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17819—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 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the reference signals, e.g. to prevent howling
    • 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
    • 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
    • G10K2210/30—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
    • G10K2210/3039—Nonlinear, e.g. clipping, numerical truncation, thresholding or variable input and output gain
    • 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)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Duct Arrangements (AREA)
GB27679/74A 1974-06-21 1974-06-21 Method of attenuating longitudinal compression waves travelling in a gas filled duct Expired GB1512014A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
GB27679/74A GB1512014A (en) 1974-06-21 1974-06-21 Method of attenuating longitudinal compression waves travelling in a gas filled duct
ZA00753895A ZA753895B (en) 1974-06-21 1975-06-17 Method of attenuating noise
NO752163A NO752163L (https=) 1974-06-21 1975-06-17
SE7507087A SE7507087L (sv) 1974-06-21 1975-06-19 Forfarande for dempning av svegningar i gaser.
DE19752527642 DE2527642A1 (de) 1974-06-21 1975-06-20 Verfahren und einrichtung zur daempfung von longitudinaldruckwellen in gasleitungen
AU82325/75A AU491349B2 (en) 1974-06-21 1975-06-20 Method of attenuating noise
BE157551A BE830489A (fr) 1974-06-21 1975-06-20 Procede d'attenuation de bruits
FR7519519A FR2275722A1 (fr) 1974-06-21 1975-06-23 Procede d'attenuation du bruit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB27679/74A GB1512014A (en) 1974-06-21 1974-06-21 Method of attenuating longitudinal compression waves travelling in a gas filled duct

Publications (1)

Publication Number Publication Date
GB1512014A true GB1512014A (en) 1978-05-24

Family

ID=10263521

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27679/74A Expired GB1512014A (en) 1974-06-21 1974-06-21 Method of attenuating longitudinal compression waves travelling in a gas filled duct

Country Status (7)

Country Link
BE (1) BE830489A (https=)
DE (1) DE2527642A1 (https=)
FR (1) FR2275722A1 (https=)
GB (1) GB1512014A (https=)
NO (1) NO752163L (https=)
SE (1) SE7507087L (https=)
ZA (1) ZA753895B (https=)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4473906A (en) * 1980-12-05 1984-09-25 Lord Corporation Active acoustic attenuator
FR2783869A1 (fr) * 1998-09-24 2000-03-31 Ecia Equip Composants Ind Auto Systeme anti-bruit de ligne d'echappement de vehicule automobile
WO2001083122A1 (en) * 2000-05-04 2001-11-08 Thorn Security Limited Method and apparatus for equalising transfer functions of linear electro-acoustic systems
FR2843999A1 (fr) * 2002-09-03 2004-03-05 Comptoir De La Technologie Dispositif actif d'attenuation du bruit de bouche au niveau d'un conduit d'echappement ou d'admission
GB2399141A (en) * 2003-03-04 2004-09-08 Visteon Global Tech Inc Variable tuned resonator

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2386881A1 (fr) * 1977-04-05 1978-11-03 Sound Attenuators Ltd Perfectionnements relatifs a l'attenuation active de sons
EP0040462A1 (en) * 1980-05-16 1981-11-25 Bose Corporation Electroacoustical audible noise reducing apparatus
DE4441217C2 (de) * 1993-12-17 1998-09-10 Voith Sulzer Papiermasch Gmbh Verfahren zur Dämpfung von Druckstößen sowie Vorrichtung zur Durchführung des Verfahrens
FR2740599B1 (fr) 1995-10-30 1997-12-19 Technofirst Dispositif d'attenuation acoustique active destine a etre dispose a l'interieur d'un conduit, en particulier pour l'insonorisation de reseau de ventilation et/ou de climatisation
DE10021031A1 (de) * 2000-05-02 2001-11-08 Mann & Hummel Filter Leitungssystem mit elektromechanischem Wandler zur Erzeugung eines Korrekturgeräusches

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4473906A (en) * 1980-12-05 1984-09-25 Lord Corporation Active acoustic attenuator
FR2783869A1 (fr) * 1998-09-24 2000-03-31 Ecia Equip Composants Ind Auto Systeme anti-bruit de ligne d'echappement de vehicule automobile
WO2001083122A1 (en) * 2000-05-04 2001-11-08 Thorn Security Limited Method and apparatus for equalising transfer functions of linear electro-acoustic systems
GB2381991A (en) * 2000-05-04 2003-05-14 Thorn Security Method and apparatus for equalising transfer functions of linear electro-acoustic systems
GB2381991B (en) * 2000-05-04 2004-03-24 Thorn Security Method and apparatus for equalising transfer functions of linear electro-acoustic systems
FR2843999A1 (fr) * 2002-09-03 2004-03-05 Comptoir De La Technologie Dispositif actif d'attenuation du bruit de bouche au niveau d'un conduit d'echappement ou d'admission
WO2004022931A1 (fr) * 2002-09-03 2004-03-18 Comptoir De La Technologie Dispositif actif d'attenuation du bruit de bouche au niveau d'un conduit d'echappement ou d'admission
GB2399141A (en) * 2003-03-04 2004-09-08 Visteon Global Tech Inc Variable tuned resonator
US6792907B1 (en) 2003-03-04 2004-09-21 Visteon Global Technologies, Inc. Helmholtz resonator

Also Published As

Publication number Publication date
SE7507087L (sv) 1975-12-22
ZA753895B (en) 1976-05-26
FR2275722B1 (https=) 1981-06-19
BE830489A (fr) 1975-10-16
FR2275722A1 (fr) 1976-01-16
DE2527642A1 (de) 1976-01-08
NO752163L (https=) 1975-12-23
AU8232575A (en) 1976-12-23

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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