EP3005345A1 - Ensemble d'émetteurs sonores destiné à un silencieux - Google Patents

Ensemble d'émetteurs sonores destiné à un silencieux

Info

Publication number
EP3005345A1
EP3005345A1 EP14729640.4A EP14729640A EP3005345A1 EP 3005345 A1 EP3005345 A1 EP 3005345A1 EP 14729640 A EP14729640 A EP 14729640A EP 3005345 A1 EP3005345 A1 EP 3005345A1
Authority
EP
European Patent Office
Prior art keywords
sound
phase difference
sound radiator
vibrationally
sheet
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.)
Withdrawn
Application number
EP14729640.4A
Other languages
German (de)
English (en)
Inventor
Karlheinz Bay
Michael Leistner
Philipp LEISTNER
Waldemar MAYSENHÖLDER
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.)
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Original Assignee
Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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 Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV filed Critical Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
Publication of EP3005345A1 publication Critical patent/EP3005345A1/fr
Withdrawn legal-status Critical Current

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
    • G10K11/1787—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
    • G10K11/1785—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
    • G10K2210/112—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
    • G10K2210/321—Physical
    • G10K2210/3219—Geometry of the configuration

Definitions

  • the application relates to an acoustic radiator arrangement and soundproofing device, in particular for active sound damping in channels or cavities.
  • Silencers in the form of scenes set with air gaps in between channels in channels yet another disadvantage of large or deep housings.
  • the associated width of the scenes causes a high back pressure against the air flow, which must be compensated with increased fan power.
  • only an expansion of the channel in question requires more scenes and thus increases the cost.
  • Sound radiators with flat housings and at the same time sufficient sound radiation at low frequencies are of great advantage.
  • Another problem arises in arrangements of active silencers in or on channels, in which emit the used or the sound emitters transversely to the channel direction. Although the generated sound propagates in the direction of the channel, a considerable part also hits the opposite reverberant channel wall. This sound is almost completely reflected and returns to the sound emitter. Depending on its nature and properties, the reflection is repeated and it comes to the expression of so-called standing waves or resonance phenomena transverse to the channel direction. These resonances are low-frequency in broad channels, the predominant
  • control system of active muffler e.g. consisting of sound field sensors and
  • Signal processing is aligned on the propagating in the channel direction sound, so that the simultaneously occurring transversely reflected sound disturbs and the
  • a sound absorber can reduce the reflection on the channel side opposite the sound radiator, as known from DE 197 30 355 C1. At medium or even high
  • Sound sources available. Between the sound sources is a sound detector.
  • One Phase shifters and a frequency-sensitive amplifier control the sound sources depending on the output of the sound detector, so that they emit anti-phase sound at the same amplitude to significantly attenuate the propagating sound.
  • the object is to efficiently generate low frequencies and at the same time to suppress the excitation of resonance phenomena across the channel direction. Walkthrough
  • an acoustic radiator arrangement in which at least two sound emitters are arranged, each having a vibrationally mounted fabric having a front side and a rear side, is to be provided.
  • the front sides of the vibrationally mounted sheet are facing an area in which sound is to be damped, and the backs of the vibrationally mounted sheet facing a common volume.
  • the sound radiator arrangement is characterized in that a control unit is provided, which is designed so that the vibrationally mounted sheet to oscillations with a Phase difference can be excited with each other, in particular with a phase difference in the range of 90 ° to 180 °.
  • the common volume may be smaller. This effect is particularly clear and particularly easy to explain with a phase difference of 1 80 °. While a vibrationally stored fabric, it is to distinguish the first mentioned, just projects into the common volume, the other vibrationally supported fabric, corresponding to the second, protrudes out of the volume. During this, the first oscillatingly supported fabric swings back into the common volume and thus the air or another gas or
  • the second vibrationally supported sheet moves out of the volume and compensates for the movement of the first vibrationally supported sheet.
  • a very low rigidity can be achieved, as would otherwise be achievable only with a very large volume.
  • This Schallstrahler arrangements for active damping of low-frequency sound can be realized, which require less space because of the low volume. This is particularly advantageous in flow channels in which can be reduced by a more compact design of the muffler resulting flow resistance. Furthermore, the above-described expense of large soundproof housing can be saved.
  • phase difference of 1 80 ° the achievable volume reduction is the clearest, at least in an arrangement with two oscillatingly supported fabrics, a volume reduction is possible even at lower phase differences.
  • a phase difference of 90 ° to 1 80 ° makes sense.
  • the vibrationally supported sheet is usually one
  • Membrane in particular around a cardboard membrane or around a plastic membrane.
  • phase difference between the sound to be damped and the vibrations of the sound radiator arrangement requires a closer definition, since it is initially unclear which vibrationally supported sheet is used to determine the phase difference.
  • a phase difference between the vibrationally supported planar structures of 1 80 ° and a phase difference to the sound to be damped of 90 ° there is no difference, apart from the sign which is not taken into account here, which vibrantly mounted sheet material is selected for determining the phase difference becomes.
  • the sound emitters are controllable based on a signal of at least one acoustic sensor which is arranged between the sound emitters.
  • the sound detected between the sound sources is a very good measure of the sound to be damped. This is also because the sound produced by the sound emitters shows destructive interference in this area, so that a sensor mounted there actually detects the sound to be damped and is hardly disturbed by the sound coming from the sound emitters.
  • a protective cover of acoustically permeable material is present at the front of the vibrationally supported sheet.
  • An acoustically permeable protective cover has the advantage that sound can pass through largely unhindered, so that the acoustic function of the sound emitter is not impaired, but some mechanical protection is achieved.
  • the invention also includes a soundproofing device in which a plurality of acoustic radiator arrangements are arranged in the manner described above, wherein the
  • Sound radiator arrangements are arranged in particular in slide construction. By an arrangement in link construction, so by a suitable arrangement of many sound radiator arrangements, sometimes structurally combined into one element, a powerful sound attenuation, for example in a flow channel can be done.
  • the soundproofing device is constructed so that two sound radiator arrangements with their vibrationally mounted
  • An acoustic radiator arrangement contains two oscillatingly supported planar structures that lie side by side in one plane.
  • the common volume on the back of the fabric is enclosed by a flat case.
  • the fabrics are installed on one side of the housing.
  • the opposite side of this side of the housing may be formed as a flat wall. If now the flat walls of two acoustic radiator arrangements are joined together, for example glued, a soundproofing device is produced, in which two sound radiator arrangements face away from each other with their sides facing away from the oscillatingly supported planar structures.
  • Such a soundproofing device is thus able to dampen sound on both sides, since on both sides externally vibratory mounted sheet
  • This embodiment of the soundproofing device is particularly suitable for installation in flow channels, such that the soundproofing device flows around on both sides.
  • the sound radiator arrangements are arranged in a polygonal or almost cylindrical shape.
  • a muffler can be realized, which extends as it were as a pipe wall to a flow-through tubular, approximately cylindrical, channel.
  • Multi-shell components are often used for sound insulation.
  • sound enters from one side through one or more shells of the component in a space between the shells.
  • This can lead to a sound field developing in this space, which also contains standing waves parallel to the plane of the shells, ie perpendicular to the original sound passage direction.
  • These standing waves can be damped by an above-described sound radiator arrangement or a sound insulation device also described. Since this sound could otherwise escape from the component, even on the side on which it has not occurred, the sound insulation is improved. Further details will now be described with reference to the drawings. Show
  • Fig. 1 is a schematic representation of the inventive Schallstrahler arrangement for active silencer for reducing the propagating sound 8 in a channel 5, comprising two sound emitters 1, which is aligned in a plane of a wall 4 of the channel 5 and a common back housing comprising a volume 6, are connected.
  • the control of the sound emitter 1 is based on the signal of an acoustic sensor 2, which is located between the two sound emitters 1, and the control signals of the sound emitters 1 by means of a signal processing 3 frequency-dependent a phase difference in the range of 90 ° to 180 °.
  • permeable material is located in front of the sound emitters.
  • FIG. 2 is a schematic representation of two inventive Schallstrahler- arrangements in the manner of a bilaterally effective central backdrop as an active muffler for reducing the propagating sound 8 in a channel.
  • FIG. 3 is a schematic representation of the inventive Schallstrahler arrangement for active silencer in the flat closed cavity 1 1 of a double-shell component 1 0 to reduce the transmission of
  • FIG. 1 shows a construction with two sound radiators 1 as the sound source of an active silencer, which has at least one sensor 2 and an electronic component 3 for signal processing, which is connected between the sensor 2 and the sound radiators 1.
  • the sound emitters 1 are arranged side by side in a plane and are located in or on a wall 4 of a channel 5, so that they can radiate sound into the channel 5.
  • the sound emitters 1 have a housing, which is located on the back of designed as membranes vibrationally mounted fabrics. In this case, a common volume is housed. If the sound emitters 1 are driven in such a way that their input signals
  • the housing can accommodate the volume 6 very flat, z. B. with a housing depth of a few millimeters, are executed, since the exact reciprocal pressure changes in the volume 6 compensate each other. This is especially important at low frequencies, as already stated.
  • Sound emitters 1 generated sound fields in the area 7 in the center of the sound emitters 1 to a minimum sound pressure, so that almost exclusively of the sensor 2 is propagated in the channel 5 and to be damped sound 8 is detected. Resonances transverse to the direction of the channel 5, however, are almost no longer excited.
  • acoustic radiator arrangements can be combined horizontally and vertically and arranged in a slotted construction.
  • a soundproofing device can be created, which can be integrated into typical ventilation ducts.
  • a composite configuration in polygonal or nearly cylindrical shape allows pipe mufflers for cylindrical ducts.
  • Cavities for example of double-shell components 10 possible to increase the sound insulation.
  • the lateral sound propagation is missing as in channels.
  • the influence of the inventive sound radiator arrangement is possible in an advantageous manner.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

L'invention concerne un ensemble d'émetteurs sonores, comprenant au moins deux émetteurs sonores (1) qui présentent chacun une structure plane oscillante présentant une face avant et une face arrière, les faces avant étant orientées vers une zone (5) dans laquelle le bruit (8) doit être amorti, et les faces arrière des structures planes oscillantes étant orientées vers un volume commun (6). L'ensemble d'émetteurs sonores est caractérisé en ce qu'il comprend une unité de commande (3) qui est configurée de telle manière que les structures planes oscillantes peuvent être excitées mutuellement en oscillation par une différence de phase, en particulier par une différence de phase comprise entre environ 90° et environ 180°.
EP14729640.4A 2013-06-07 2014-06-06 Ensemble d'émetteurs sonores destiné à un silencieux Withdrawn EP3005345A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013210709.9A DE102013210709A1 (de) 2013-06-07 2013-06-07 Schallstrahler-Anordnung für aktive Schalldämpfer
PCT/EP2014/061859 WO2014195473A1 (fr) 2013-06-07 2014-06-06 Ensemble d'émetteurs sonores destiné à un silencieux

Publications (1)

Publication Number Publication Date
EP3005345A1 true EP3005345A1 (fr) 2016-04-13

Family

ID=50933157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14729640.4A Withdrawn EP3005345A1 (fr) 2013-06-07 2014-06-06 Ensemble d'émetteurs sonores destiné à un silencieux

Country Status (3)

Country Link
EP (1) EP3005345A1 (fr)
DE (1) DE102013210709A1 (fr)
WO (1) WO2014195473A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11812219B2 (en) * 2021-07-23 2023-11-07 Toyota Motor Engineering & Manufacturing North America, Inc. Asymmetry sound absorbing system via shunted speakers

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1583758A (en) * 1976-10-01 1981-02-04 Nat Res Dev Attenuation of sound waves in ducts
US4473906A (en) * 1980-12-05 1984-09-25 Lord Corporation Active acoustic attenuator
US4596034A (en) 1981-01-02 1986-06-17 Moncrieff J Peter Sound reproduction system and method
GB2160742B (en) * 1984-06-21 1988-02-03 Nat Res Dev Damping for directional sound cancellation
US5109416A (en) 1990-09-28 1992-04-28 Croft James J Dipole speaker for producing ambience sound
US5590849A (en) * 1994-12-19 1997-01-07 General Electric Company Active noise control using an array of plate radiators and acoustic resonators
US6343127B1 (en) * 1995-09-25 2002-01-29 Lord Corporation Active noise control system for closed spaces such as aircraft cabin
DE59704196D1 (de) 1996-05-14 2001-09-06 Fraunhofer Ges Forschung Reaktiver schalldämpfer
JP3510427B2 (ja) * 1996-08-15 2004-03-29 三菱重工業株式会社 能動吸音壁
DE19730355C1 (de) 1997-07-15 1999-03-18 Fraunhofer Ges Forschung Schallabsorber in Lüftungskanälen
DE19861018C2 (de) * 1998-12-15 2001-06-13 Fraunhofer Ges Forschung Gesteuerter akustischer Wellenleiter zur Schalldämpfung
DE20205160U1 (de) * 2002-04-03 2002-09-19 ITAP - Institut für technische und angewandte Physik GmbH, 26160 Bad Zwischenahn Schalldämpfungselement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014195473A1 *

Also Published As

Publication number Publication date
WO2014195473A1 (fr) 2014-12-11
DE102013210709A1 (de) 2014-12-11

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