EP0454601B1 - Verfahren zur Dämpfung von akustischen Wellen in einem Kreis von zirkulierender Flüssigkeit - Google Patents

Verfahren zur Dämpfung von akustischen Wellen in einem Kreis von zirkulierender Flüssigkeit Download PDF

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Publication number
EP0454601B1
EP0454601B1 EP91440031A EP91440031A EP0454601B1 EP 0454601 B1 EP0454601 B1 EP 0454601B1 EP 91440031 A EP91440031 A EP 91440031A EP 91440031 A EP91440031 A EP 91440031A EP 0454601 B1 EP0454601 B1 EP 0454601B1
Authority
EP
European Patent Office
Prior art keywords
conduit
wall
transducers
process according
transducer
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 - Lifetime
Application number
EP91440031A
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English (en)
French (fr)
Other versions
EP0454601A1 (de
Inventor
Eric Landel
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.)
Principia Recherche Developpement
Original Assignee
Principia Recherche Developpement SA
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Application filed by Principia Recherche Developpement SA filed Critical Principia Recherche Developpement SA
Publication of EP0454601A1 publication Critical patent/EP0454601A1/de
Application granted granted Critical
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Anticipated expiration legal-status Critical
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Classifications

    • 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
    • G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
    • 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
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/101—One dimensional
    • 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
    • G10K2210/129—Vibration, e.g. instead of, or in addition to, acoustic 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
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3212—Actuator details, e.g. composition or microstructure

Definitions

  • the present invention relates to a new method for attenuating acoustic waves in a fluid circulation circuit according to the preamble of claim 1 (see US-A-4044023).
  • a first type of means uses passive systems, based for example on the use of absorbent materials or resonators of the HELMHOLTZ type.
  • passive systems based for example on the use of absorbent materials or resonators of the HELMHOLTZ type.
  • these solutions based on the dissipative qualities of the materials can only concern the domain of high frequencies.
  • a second type of means uses active systems, that is to say determining attenuation of the waves.
  • a member for measuring the waves propagating in the circuit and on the other hand, an acoustic transmitter controlled from the signals collected by said member, for example a microphone, in such a way that, by this transmitter, is emitted a wave train in opposition with the previous one, and that their resultant is in principle null.
  • the present invention also relates to an active system, but based on a different principle, namely that according to which, if the circuit wall is subjected over a certain portion to local deformations corresponding to a vibratory state depending on the frequency of the train incident acoustic waves, the latter are reflected and can no longer propagate in this portion, which is thus acoustically isolated.
  • FIG. 1 there is shown symbolically a portion of the circuit consisting of a cylindrical tube c of radius R , assumed to be infinitely rigid, and in which there are three portions 1, 2 and 3 .
  • the first separation constant A m is zero, which leads to the existence of a plane wave.
  • This principle has various advantages which mainly consist in the fact that one is reduced to a local condition linking the pressure and the speed of deformation of the wall induced by the vibrations and that this condition remains true whatever the external disturbances, l inconsistency of the pressure field, reflections on termination, etc ...
  • active movable wall designates the portion 2 of the pipe wall acting as a “filter” for an incident wave train
  • electro-mechanical systems of the transducer type which can for example use piezoelectric effects, which are placed so that they can ensure a speed of deformation of the wall over the entire periphery of that -this.
  • One means of achieving this result may consist, as illustrated in FIG. 2, of inserting a transducer 10 into a ring 11, the vibrations of which cause uniform variations in the radius.
  • Another means may consist in regularly distributing transducer elements 12 of the piston type all around the pipe C, either circular as illustrated in FIG. 3, or square as illustrated in FIG. 4, in which case the transducers are placed respectively equiangularly or on each side.
  • any vibrating system 12 which can be controlled by an electrical control (electromagnet, piezoelectric or the like) can be used to impose on the wall C vibrations inducing appropriate deformations.
  • FIG. 5 there is illustrated diagrammatically an arrangement allowing the control of the elements 12.
  • the pressure signals coming from the measuring elements 13 are then processed by a control member 14 which will deduce therefrom the displacements to be imposed on the elements of movable walls 12.
  • This control system can use electronic components or use an analog principle allowing the law to be implemented (3.2).
  • FIG. 6 there is shown a variant of the system according to the invention intended to obtain even more effective attenuation results.
  • the system described above may have performance limitations in certain frequency bands, particularly for those which cancel the function of BESSEL J o .

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Vibration Prevention Devices (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Claims (7)

  1. Verfahren zur Dämpfung der akustischen Wellen in einem Leitungskreis eines zirkulierenden Fluids, darin bestehend, daß in die Wand einer zu diesem Kreis gehörenden Leitung mindestens ein Wandler (10, 12) eingefügt wird, der dieser Wand eine Vibration mitteilt, derart, daß eine aktive bewegliche Wand geschaffen wird, deren radiale Verschiebungen zum lokalen Schalldruck gegenphasig sind, so daß ein Zustand der Nichtausbreitung der Schallwellen geschaffen wird und also die aus der Leitung stammenden Wellen zum Wandler reflektiert werden, dadurch gekennzeichnet, daß der genannte Wandler (10, 12) eine Geschwindigkeit der Deformation der Wand über deren ganzen Umfang sicherstellt.
  2. Verfahren nach Patentanspruch 1, dadurch gekennzeichnet, daß die Wandler gleichförmig über den ganzen Umfang eines Leitungsquerschnittes verteilt sind.
  3. Verfahren nach Patentanspruch 2, dadurch gekennzeichnet, daß die Wandler bei kreisförmigem Querschnitt der Leitung mit gleichem Winkelabstand zueinander auf deren Umfang verteilt sind.
  4. Verfahren nach Patentanspruch 2, dadurch gekennzeichnet, daß die Wandler bei quadratischem Querschnitt der Leitung an jeder Seite des Quadrates angeordnet sind.
  5. Verfahren nach irgendeinem der Patentansprüche 1 bis 4, dadurch gekennzeichnet, daß zur Sicherstellung der Regelung der genannten Wandler außerdem Mittel vorgesehen sind, die die Kräfte messen, die auf jedes Element der beweglichen Wand einwirken, wobei diese Messungen eine Abschätzung des gleichförmigen Schalldruckes über den Leitungsumfang liefern und anschließend durch ein Steuerungsmittel behandelt werden, das zu jedem Zeitpunkt die Verschiebungen bestimmt, die den Wandlern mitzuteilen sind, damit sie zum Druck gegenphasig sind.
  6. Verfahren nach Patentanspruch 5, dadurch gekennzeichnet, daß die genannten Mittel unter den Dehnungsmeßgeräten, piezoelektrischen Quarzkristallen und Mikrophonen ausgewählt werden.
  7. Verfahren nach irgendeinem der vorangehenden Patentansprüche, dadurch gekennzeichnet, daß zur Erhöhung der Effektivität des Dämpfungssystems Wandler unterschiedlicher Radien nebeneinander in der Leitung angeordnet werden.
EP91440031A 1990-04-25 1991-04-18 Verfahren zur Dämpfung von akustischen Wellen in einem Kreis von zirkulierender Flüssigkeit Expired - Lifetime EP0454601B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9005595A FR2661540B1 (fr) 1990-04-25 1990-04-25 Procede pour l'attenuation des ondes acoustiques dans un circuit de circulation de fluide.
FR9005595 1990-04-25

Publications (2)

Publication Number Publication Date
EP0454601A1 EP0454601A1 (de) 1991-10-30
EP0454601B1 true EP0454601B1 (de) 1996-03-06

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EP91440031A Expired - Lifetime EP0454601B1 (de) 1990-04-25 1991-04-18 Verfahren zur Dämpfung von akustischen Wellen in einem Kreis von zirkulierender Flüssigkeit

Country Status (4)

Country Link
EP (1) EP0454601B1 (de)
AT (1) ATE135131T1 (de)
DE (1) DE69117571T2 (de)
FR (1) FR2661540B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009024343A1 (de) * 2009-06-09 2010-12-16 Rohde & Schwarz Gmbh & Co. Kg Elektronisches Gerät mit Geräuschunterdrückungssystem
DE102022206211B4 (de) * 2022-06-22 2024-01-25 Vitesco Technologies GmbH Schallkompensationsvorrichtung und Fahrzeug

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044203A (en) * 1972-11-24 1977-08-23 National Research Development Corporation Active control of sound waves
US4171465A (en) * 1978-08-08 1979-10-16 National Research Development Corporation Active control of sound waves
FR2632473B1 (fr) * 1988-06-01 1990-09-07 Saint Louis Inst Dispositifs d'attenuation active de vibrations, notamment de bruit, disposes en serie

Also Published As

Publication number Publication date
FR2661540A1 (fr) 1991-10-31
DE69117571T2 (de) 1996-08-22
ATE135131T1 (de) 1996-03-15
EP0454601A1 (de) 1991-10-30
DE69117571D1 (de) 1996-04-11
FR2661540B1 (fr) 1996-10-31

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