EP0898774A1 - Reactive sound absorber - Google Patents
Reactive sound absorberInfo
- Publication number
- EP0898774A1 EP0898774A1 EP97923077A EP97923077A EP0898774A1 EP 0898774 A1 EP0898774 A1 EP 0898774A1 EP 97923077 A EP97923077 A EP 97923077A EP 97923077 A EP97923077 A EP 97923077A EP 0898774 A1 EP0898774 A1 EP 0898774A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane
- reactive
- sensor
- silencer according
- amplifier
- 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
Links
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
- G10K11/17875—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
- G10K2210/112—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
- G10K2210/3026—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
- G10K2210/30—Means
- G10K2210/321—Physical
- G10K2210/3217—Collocated sensor and cancelling actuator, e.g. "virtual earth" designs
-
- 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
- G10K2210/3227—Resonators
- G10K2210/32271—Active resonators
Definitions
- the invention relates to a reactive silencer according to the preamble of claim 1.
- This cancellation can be monitored with a second microphone (10) in the direction of sound propagation, the signal of which can simultaneously serve to adapt the signal processing to any changes in the sound propagation in the relevant channel.
- a second microphone 10
- this procedure succeeds very precisely, at least under laboratory conditions.
- their practical use is characterized by high sensitivity in the case of superimposed air flow or in the case of temperature fluctuations, and by high expenditure on electronics and signal processing.
- Another approach proposes a hybrid silencer, Figure 6, in DE 40 27 51 1, in which an optimal acoustic impedance of the duct wall (1) is realized on the front of a known, passive subsystem (12) by means of an active subsystem that supplements the rear should.
- the starting point is the acoustic properties of the passive subsystem, for example a layer made of porous absorber material.
- the other elements of the hybrid silencer are used to generate a rear impedance of the passive subsystem.
- the sound pressure behind the passive subsystem has to be measured with a microphone (13).
- the microphone voltage is then fed back via a signal former (15) to a loudspeaker (14), on the membrane surface of which the calculated impedance is to be set.
- This method presupposes that the signal former proposed in DE 40 27 51 1 firstly compensates for the behavior of all electromechanical components (microphone, loudspeaker, box, etc.) and secondly impresses the desired terminating impedance on the system.
- the properties of the electromechanical components have been thoroughly examined and described. Thereafter, the adaptation is only possible through complex and only approximately realizable transfer functions of the signal former.
- Active Helmholtz resonators according to DE 42 26 885 and Spannheimer, H., Freymann, R., Fastl, H .: Akti ⁇ ver He-Imholtz resonator for damping internal cavity vibrations represent a variant of the basic idea of hybrid silencers. Progress in acoustics - DAGA 1994, DPG-GmbH, Bad Honnef: 1994, pp. 525-528, -dar, Figure 7, preferably with the area of application in motor vehicles.
- a conventional Helmholtz resonator represents the passive subsystem described in DE 40 27 51 1, which is actively influenced on its rear side.
- the known Helmholtz resonator is defined in detail by a hollow body (16) and an opening (17).
- the microphone (18) provided outside the Helmholtz resonator next to the opening provides information about the sound pressure prevailing there, so that a transmission system (20) with special (PDT) frequency and time behavior provides the required voltage for the loudspeaker (19). generated in the hollow body.
- This loudspeaker determines or changes the transmission behavior (resonance frequency) of the original Helmholtz resonator.
- the loudspeaker in the hollow body thus serves the practical enlargement (ailg. change) of the hollow body volume for improved sound absorption of the Helmholtz resonator at low frequencies.
- the goal here is to actively reduce the resonance frequency and thus the sound absorption of the passive Helmholtz resonator.
- the object of the invention is to increase the efficiency of the reactive silencer according to the preamble of claim 1 and to reduce the technical outlay. According to the invention this is solved by the reactive silencer according to claim 1.
- Advantageous embodiments of the invention are characterized in the subclaims.
- the invention relates to a reactive silencer in which both the detection and the active influencing of the sound field take place directly and directly on the duct wall (1), Figure 1.
- the basic component is a closed, compact cassette (2) in which all components are combined. Its front is part of the duct wall and is covered by at least one vibratable membrane (3), e.g. a loudspeaker membrane, embodied. Due to its mass per unit area, this membrane (3) forms an acoustic resonance system with the cavity (4) of the cassette housing located behind it. The sound waves occurring in the channel stimulate this resonance system to vibrate at and near its natural frequency. The activation takes place with the help of a sensor (5), which is arranged in the immediate vicinity, in or on the membrane (3) and detects the membrane vibrations.
- a sensor (5) which is arranged in the immediate vicinity, in or on the membrane (3) and detects the membrane vibrations.
- This sensor function can e.g. Take over microphones, structure-borne sound sensors or optical motion sensors. After an inverting, linear amplification (6), the output signal of the sensor is used to control an electroacoustic transducer (7), e.g. the voice coil of a speaker.
- an electroacoustic transducer (7) e.g. the voice coil of a speaker.
- the membrane is forced to vibrate more, the sound pressure on the lined wall surface is further reduced and the sound wave is dampened more.
- the shape of the housing (2) can be varied since only the volume of the cavity (4) influences the frequency characteristic.
- absorbers can be provided in the interior of the housing (2) which is soundproof to the outside.
- the area-related membrane mass can also be used, for example through different loudspeakers.
- the principle-based linear amplifier (6) does not contain any frequency evaluation of the sensor signal in order to compare it with filters, signal formers or other transmissions. to avoid undesirable phase shifts associated with systems. This prevents disturbing acoustic interactions between adjacent cassettes and large-area, reactive silencers from many individual cassettes, for example in reactive silencers, Figure 2.
- the operating voltages for the sensors (5) and amplifiers (6) are provided by conventional power supplies or batteries.
- the measured insertion loss of an exemplary reactive silencer, Figure 3, consisting of 4 cassettes, is shown in Figure 4.
- the reactive silencer works without passive subsystems (porous absorbers, Helmholtz resonators etc.). This fact as well as the spatial concentration of membrane (3) and sensor (5) in the channel wall enable the use of a simple amplifier (6). As a result, all components of the reactive silencer can be easily integrated in a compact housing (2).
- the reactive silencer is connected to any sound field and to any sound field limitation, e.g. Channel redirection, adaptable.
- the reactive silencer cassettes and thus all electroacoustic components can be protected against physical and chemical loads occurring in the duct with the aid of acoustically permeable covers.
- the reactive silencer When the microphone is used as a sensor (5), the reactive silencer is designed to be positioned behind the membrane (3), ie in the cavity (4) of the cassette (2).
- the principle of operation of the reactive silencer is not only applicable to flat waves in comparatively narrow channels, but also also effects a damping of modal sound fields in any channels or rooms. In these applications, the vibrating membranes of the reactive cassettes also reduce the surface area of the sound pressure on the lined wall surface and dampen the existing sound field.
- Figure 1 Exemplary design of a reactive silencer cassette in a duct wall (1), consisting of the housing (2) with at least one membrane (3) in front of a cavity (4), a sensor (5), a linear amplifier (6) and one electroacoustic transducer (7).
- Figure 2 Cascaded arrangement of reactive silencer cassettes in a silencer backdrop.
- Figure 3 Embodiment of a reactive silencer consisting of 4 cassettes in one.
- Figure 4 Measured insertion loss of the exemplary reactive silencer in Figure 3.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Duct Arrangements (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI9730209T SI0898774T1 (en) | 1996-05-14 | 1997-05-14 | Reactive sound absorber |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19619466 | 1996-05-14 | ||
DE19619466 | 1996-05-14 | ||
PCT/EP1997/002471 WO1997043754A1 (en) | 1996-05-14 | 1997-05-14 | Reactive sound absorber |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0898774A1 true EP0898774A1 (en) | 1999-03-03 |
EP0898774B1 EP0898774B1 (en) | 2001-08-01 |
Family
ID=7794315
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97923077A Expired - Lifetime EP0898774B1 (en) | 1996-05-14 | 1997-05-14 | Reactive sound absorber |
Country Status (9)
Country | Link |
---|---|
US (1) | US6385321B1 (en) |
EP (1) | EP0898774B1 (en) |
AT (1) | ATE203849T1 (en) |
DE (1) | DE59704196D1 (en) |
DK (1) | DK0898774T3 (en) |
ES (1) | ES2162292T3 (en) |
GR (1) | GR3037001T3 (en) |
PT (1) | PT898774E (en) |
WO (1) | WO1997043754A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013210709A1 (en) | 2013-06-07 | 2014-12-11 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Schallstrahler arrangement for active silencers |
WO2017077231A1 (en) | 2015-11-02 | 2017-05-11 | Technofirst | Apparatus for natural ventilation of a room |
WO2017077235A1 (en) | 2015-11-02 | 2017-05-11 | Technofirst | Unit for the natural ventilation of a room, provided with a sound absorber |
WO2017077233A1 (en) | 2015-11-02 | 2017-05-11 | Technofirst | Apparatus for natural ventilation of a room having a ventilation passage combined with a noise absorber |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6778673B1 (en) * | 1998-10-28 | 2004-08-17 | Maximilian Hans Hobelsberger | Tunable active sound absorbers |
DE19861018C2 (en) | 1998-12-15 | 2001-06-13 | Fraunhofer Ges Forschung | Controlled acoustic waveguide for sound absorption |
GB9920883D0 (en) * | 1999-09-03 | 1999-11-10 | Titon Hardware | Ventilation assemblies |
DE10019543C2 (en) * | 2000-04-20 | 2002-03-07 | Fraunhofer Ges Forschung | Supply air |
US6940983B2 (en) * | 2000-05-19 | 2005-09-06 | Siemens Vdo Automotive Inc. | Resonator for active noise attenuation system |
DE102005048905B3 (en) * | 2005-10-10 | 2006-08-31 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Active channel noise attenuator having several acoustic sensors to detect the noise field parameters at the loud speaker |
DE102006010558A1 (en) * | 2006-03-06 | 2007-09-13 | J. Eberspächer GmbH & Co. KG | Active silencer for an exhaust system |
DE102006042224B3 (en) * | 2006-09-06 | 2008-01-17 | J. Eberspächer GmbH & Co. KG | Active sound absorber for exhaust-gas system of internal-combustion engine particularly in motor vehicle, has anti sound generator comprises membrane drive, with which anti sound generator is coupled with external wall of sound absorber |
US7789194B2 (en) * | 2007-04-20 | 2010-09-07 | Cardinal Health 212, Inc. | Acoustic attenuation chamber |
DE102007032600A1 (en) * | 2007-07-11 | 2009-01-15 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Apparatus and method for improving the attenuation of acoustic waves |
DE102009041890A1 (en) | 2009-09-18 | 2011-06-01 | Benteler Automobiltechnik Gmbh | Silencer i.e. exhaust silencer, for damping fluid- or acoustic waves in exhaust gas of exhaust system of motor vehicle, has actuating element provided with electric oscillator circuit and electroacoustic converter |
AT510851B1 (en) * | 2011-03-16 | 2012-07-15 | Schertler Sa | VIBRATION DETECTION DEVICE FOR FREQUENCIES IN THE HEARING AREA |
WO2014045123A2 (en) * | 2012-09-24 | 2014-03-27 | Actiwave Ab | Control and protection of loudspeakers |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2632474B1 (en) | 1988-06-01 | 1991-04-26 | Saint Louis Inst | DEVICE FOR ACTIVE MITIGATION OF VIBRATION AND IN PARTICULAR NOISE WITHOUT ACOUSTIC DELAY |
US5233137A (en) | 1990-04-25 | 1993-08-03 | Ford Motor Company | Protective anc loudspeaker membrane |
DE4027511C1 (en) * | 1990-08-30 | 1991-10-02 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V., 8000 Muenchen, De | |
US6160892A (en) * | 1993-12-30 | 2000-12-12 | Bbn Corporation | Active muffler |
DE4419933A1 (en) | 1994-06-08 | 1995-12-14 | Gerhard Dr Lindner | Piezoelectric polymer film acoustic generator for active cancellation |
US6078671A (en) * | 1996-09-05 | 2000-06-20 | Ebara Corporation | Silencer for attenuating a sound or noise transmitted through an air passage of a duct |
-
1997
- 1997-05-14 DE DE59704196T patent/DE59704196D1/en not_active Expired - Lifetime
- 1997-05-14 AT AT97923077T patent/ATE203849T1/en active
- 1997-05-14 WO PCT/EP1997/002471 patent/WO1997043754A1/en active IP Right Grant
- 1997-05-14 DK DK97923077T patent/DK0898774T3/en active
- 1997-05-14 EP EP97923077A patent/EP0898774B1/en not_active Expired - Lifetime
- 1997-05-14 PT PT97923077T patent/PT898774E/en unknown
- 1997-05-14 ES ES97923077T patent/ES2162292T3/en not_active Expired - Lifetime
- 1997-05-14 US US09/180,899 patent/US6385321B1/en not_active Expired - Fee Related
-
2001
- 2001-10-24 GR GR20010401874T patent/GR3037001T3/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9743754A1 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013210709A1 (en) | 2013-06-07 | 2014-12-11 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Schallstrahler arrangement for active silencers |
WO2017077231A1 (en) | 2015-11-02 | 2017-05-11 | Technofirst | Apparatus for natural ventilation of a room |
WO2017077235A1 (en) | 2015-11-02 | 2017-05-11 | Technofirst | Unit for the natural ventilation of a room, provided with a sound absorber |
WO2017077233A1 (en) | 2015-11-02 | 2017-05-11 | Technofirst | Apparatus for natural ventilation of a room having a ventilation passage combined with a noise absorber |
Also Published As
Publication number | Publication date |
---|---|
WO1997043754A1 (en) | 1997-11-20 |
PT898774E (en) | 2002-01-30 |
GR3037001T3 (en) | 2002-01-31 |
EP0898774B1 (en) | 2001-08-01 |
US6385321B1 (en) | 2002-05-07 |
DE59704196D1 (en) | 2001-09-06 |
DK0898774T3 (en) | 2001-10-22 |
ATE203849T1 (en) | 2001-08-15 |
ES2162292T3 (en) | 2001-12-16 |
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