EP0805431A2 - Méthode et dispositif pour réduction active du bruit dans les flux de gaz - Google Patents

Méthode et dispositif pour réduction active du bruit dans les flux de gaz Download PDF

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Publication number
EP0805431A2
EP0805431A2 EP97102834A EP97102834A EP0805431A2 EP 0805431 A2 EP0805431 A2 EP 0805431A2 EP 97102834 A EP97102834 A EP 97102834A EP 97102834 A EP97102834 A EP 97102834A EP 0805431 A2 EP0805431 A2 EP 0805431A2
Authority
EP
European Patent Office
Prior art keywords
volume flow
lines
volume
sound
internal combustion
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.)
Granted
Application number
EP97102834A
Other languages
German (de)
English (en)
Other versions
EP0805431B1 (fr
EP0805431A3 (fr
Inventor
Ingo Dr. Borchers
Ludwig Dipl.-Ing. Schauwecker
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.)
Dornier GmbH
Original Assignee
Dornier GmbH
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 Dornier GmbH filed Critical Dornier GmbH
Publication of EP0805431A2 publication Critical patent/EP0805431A2/fr
Publication of EP0805431A3 publication Critical patent/EP0805431A3/fr
Application granted granted Critical
Publication of EP0805431B1 publication Critical patent/EP0805431B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G10K11/1785—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
    • 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
    • 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
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • 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
    • G10K2210/1282—Automobiles
    • G10K2210/12822—Exhaust pipes or mufflers
    • 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
    • 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
    • G10K2210/32121—Fluid amplifiers, e.g. modulated gas flow speaker using electrovalves

Definitions

  • the invention relates to a method and a device for sound reduction according to the preamble of claims 1 and 11 respectively.
  • DE 43 41 951 A1 discloses a method for active noise reduction for the exhaust system of a motor vehicle, in which two volume flows are superimposed.
  • the path length of at least one of the two volume flows is changed as a function of the operating temperature in order to obtain an optimal phase shift of the two volume flows with regard to sound absorption.
  • the change in the path length of the volume flow is made by a variable-length pipe reached.
  • the area which the tube occupies at maximum deflection must therefore be kept clear at all times, so that there is a large space requirement for the device.
  • the object of the invention is therefore to provide a method and device for active noise reduction with the smallest possible size.
  • a first and a second volume flow are present, one of which is changed by modulation with a predetermined frequency spectrum in such a way that the noise reduction is effected in the subsequent interference of the two volume flows.
  • the modulation creates a sound spectrum in the modulated volume flow which, in the event of subsequent interference with the other volume flow, enables optimal cancellation over a large frequency range.
  • the method according to the invention is the cancellation over a large sound spectrum possible.
  • the method can also be used quite generally to generate a predetermined sound spectrum (sound design).
  • one of the two volume flows can be found in the other volume flow. This means that a volume flow, which is associated with the sound to be reduced, is divided into two partial volume flows, the two partial volume flows being brought into interference after corresponding modulation of one of the two partial flows.
  • the volume flow affected by the sound to be reduced can be overlaid with a second volume flow that is independent of the first volume flow and is present anyway on the unit in question (e.g. airstream, vehicle, compressed air, exhaust gas jet).
  • a second volume flow that is independent of the first volume flow and is present anyway on the unit in question (e.g. airstream, vehicle, compressed air, exhaust gas jet).
  • Fig. 1 shows the first method alternative of the invention in a schematic representation.
  • the line 1 is shown with the first volume flow 10, the sound of which is to be reduced.
  • a second line 2 branches off, which leads part of the first volume flow, now referred to as the second volume flow 20, to an actuator A, in which it is modulated in phase with a predetermined frequency spectrum.
  • the modulation is carried out in such a way that, in the subsequent interference of the first and second volume flows 10, 20, the highest possible noise reduction is achieved over the entire sound spectrum (expedient phase difference between the first and second volume flows, in particular 180 ° ).
  • the spectrum of the sound waves to be amortized in the first volume flow 10 is detected by a sensor (not shown here), for example a microphone, which supplies a reference signal for sound cancellation.
  • the reference signal is processed in a known manner and is used to control the actuator A.
  • This method can e.g. be used to reduce noise in the exhaust gas jet of internal combustion engines, especially in motor vehicles.
  • the use for sound reduction in a compressed air stream of a compressed air compressor is also advantageous.
  • Another field of application for the specified method is the reduction of driving noise in vehicles, in particular rail vehicles.
  • the head wind In ICE trains, the head wind generates a lot of noise, especially on the pantographs. This can be remedied if part of the head wind is modulated in an actuator and then overlaid with the noise-producing head wind. In contrast to the case shown in FIG. 1, line 1 is omitted here, since the airstream is naturally not line-bound.
  • Fig. 2 shows the second method alternative of the invention in a schematic representation.
  • One recognizes the line 1 with the first volume flow 10, the sound of which is to be reduced.
  • a line 2 for the second volume flow 20 which is independent of the line 1 and which is connected to the input of the actuator A.
  • This second line 2 is fed by a volume flow that is already present on the vehicle or unit in question, regardless of the noise reduction.
  • FIG. 3 A specific embodiment of the invention as a muffler for an internal combustion engine is shown in FIG. 3.
  • the exhaust gas jet of an internal combustion engine is divided into a prechamber 40 after flowing through a conventional pre-muffler 50 and then supplied to the actuator A in the form of two coaxial streams 10, 20.
  • the central part of the exhaust jet (first volume flow 10) flows through the actuator A largely undisturbed, the annular outer exhaust jet (second volume flow 20) is through a valve modulated with a predetermined frequency spectrum (FIG. 4) and interferes with the central beam 10 at the outlet of the actuator A.
  • the actuator A is controlled by sensors, here microphones (FIG. 4), which detect the sound frequency spectrum to be canceled and possibly the remaining sound.
  • the microphone signals are processed in a manner known per se and serve as input signals for the modulation in the actuator. Since the two gas streams 10, 20 have approximately the same temperatures (influence on the speed of sound) and the sound sources have almost the same position, the superposition of the sound waves leads to an optimal, largely directionally insensitive cancellation of the undesired noises.
  • the lines 1, 2 can also be arranged one inside the other to improve the directional characteristic in such a way that they continue to run in parallel, but their axes no longer coincide.
  • the two streams can also be routed next to one another and e.g.
  • the actuator can also be supplied with bleed air from an existing turbocharger.
  • FIG. 4 shows the sectional drawing of an advantageous embodiment of a device according to the invention, as can be used, for example, in the device according to FIG. 3.
  • An electro-pneumatic actuator A with inputs and outputs for the second volume flow 20 is placed on the central line 1 (here: exhaust pipe for the exhaust jet of an internal combustion engine) for the first volume flow 10.
  • the second volume flow 20 in line 2 can be taken both from line 1 for the first volume flow 10 and from another volume flow present on the vehicle or unit.
  • the sound waves to be repaid are recorded via one or more microphones M in line 1.
  • three powerful, axially magnetized ring magnets 60 are threaded onto the exhaust pipe 1.
  • the two outer end faces of the permanent magnets 60 form a north pole and a south pole.
  • the magnets 60 are seated in a pot-shaped housing 62 made of cast iron, which together with the pole shoe 64 forms an almost closed magnetic circuit at the other end.
  • a thin-walled, cylindrical coil (valve ring) 66 vibrates, which is acted upon by a control signal derived from the output signal of the microphone M.
  • the coil 66 is suspended from several springs (leaf springs 67).
  • the gas stream 20 to be modulated is led to the outlet through openings in the housing base around the magnets 60 into a prechamber 68 and then through an annular gap, the width of which is varied by the oscillating coil 66 in accordance with the selected control signal.
  • Antechamber 68, gap and outlet opening are delimited by the outlet-side cover 65, which is screwed in front of the pot-shaped housing 62.
  • the outlet-side area of the secondary gas line 2 is designed as a sound funnel.
  • the actuator described can be used to generate a freely selectable sound frequency spectrum in the first volume flow 10.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Exhaust Silencers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Separation Of Gases By Adsorption (AREA)
EP97102834A 1996-05-02 1997-02-21 Méthode et dispositif pour réduction active du bruit dans les flux de gaz Expired - Lifetime EP0805431B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19617465A DE19617465C2 (de) 1996-05-02 1996-05-02 Verfahren und Vorrichtung zur aktiven Schallreduzierung
DE19617465 1996-05-02

Publications (3)

Publication Number Publication Date
EP0805431A2 true EP0805431A2 (fr) 1997-11-05
EP0805431A3 EP0805431A3 (fr) 1999-10-20
EP0805431B1 EP0805431B1 (fr) 2002-04-24

Family

ID=7793005

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97102834A Expired - Lifetime EP0805431B1 (fr) 1996-05-02 1997-02-21 Méthode et dispositif pour réduction active du bruit dans les flux de gaz

Country Status (4)

Country Link
EP (1) EP0805431B1 (fr)
JP (1) JPH112113A (fr)
DE (2) DE19617465C2 (fr)
ES (1) ES2175205T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001046944A1 (fr) * 1999-12-22 2001-06-28 Pratt & Whitney Canada Corp. Attenuation de bruit au moyen d'un ventilateur et d'un compresseur
US9881602B2 (en) 2014-07-11 2018-01-30 Tenneco Gmbh Sound system for a motor vehicle

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10049884C1 (de) * 2000-10-10 2002-04-04 Horst Schmitt Druckluft als Schallschutzvorrichtung
DE102017203181B4 (de) 2017-02-28 2021-08-26 Audi Ag Klangerzeugungsvorrichtung zur Erzeugung von Abgasanlagensound sowie ein zugehöriges Kraftfahrzeug
DE102017203182B4 (de) 2017-02-28 2021-09-02 Audi Ag Klangerzeugungsvorrichtung zur Erzeugung von Abgasanlagensound sowie ein zugehöriges Kraftfahrzeug
DE202017007444U1 (de) 2017-11-03 2021-08-10 Cisma Solutions Aps Auspuffblende mit Schallquelle
DE102017219573B4 (de) * 2017-11-03 2021-11-11 Cisma Solutions Aps Auspuffblende mit Schallquelle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02136504A (ja) * 1988-11-16 1990-05-25 Aisin Seiki Co Ltd 内燃エンジンの消音装置
GB8928052D0 (en) * 1989-12-12 1990-02-14 Lotus Group Plc Control of pressure vibrations in ducts
DE4341951A1 (de) * 1992-12-17 1994-06-23 Volkswagen Ag Interferenz-Geräuschdämpfer
US5325438A (en) * 1993-02-01 1994-06-28 At&T Bell Laboratories Active noise-cancellation system for automotive mufflers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001046944A1 (fr) * 1999-12-22 2001-06-28 Pratt & Whitney Canada Corp. Attenuation de bruit au moyen d'un ventilateur et d'un compresseur
US6973193B1 (en) 1999-12-22 2005-12-06 Pratt & Whitney Canada Corp. Fan and compressor noise attenuation
US9881602B2 (en) 2014-07-11 2018-01-30 Tenneco Gmbh Sound system for a motor vehicle

Also Published As

Publication number Publication date
DE59707085D1 (de) 2002-05-29
EP0805431B1 (fr) 2002-04-24
EP0805431A3 (fr) 1999-10-20
DE19617465A1 (de) 1997-11-13
DE19617465C2 (de) 1999-05-20
JPH112113A (ja) 1999-01-06
ES2175205T3 (es) 2002-11-16

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