DE19727617A1 - Active sound absorption system for e.g. ventilation ducts - Google Patents
Active sound absorption system for e.g. ventilation ductsInfo
- Publication number
- DE19727617A1 DE19727617A1 DE19727617A DE19727617A DE19727617A1 DE 19727617 A1 DE19727617 A1 DE 19727617A1 DE 19727617 A DE19727617 A DE 19727617A DE 19727617 A DE19727617 A DE 19727617A DE 19727617 A1 DE19727617 A1 DE 19727617A1
- Authority
- DE
- Germany
- Prior art keywords
- individual channels
- section
- split
- active sound
- transducers
- 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- Withdrawn
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
- G10K11/17879—General system configurations using both a reference signal and an error signal
- G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
-
- 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
- G10K2210/301—Computational
- G10K2210/3027—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
- G10K2210/50—Miscellaneous
- G10K2210/512—Wide band, e.g. non-recurring signals
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Duct Arrangements (AREA)
Abstract
Description
Aktive Schalldämpfungseinrichtungen durch die Erzeugung von Antischall sind hinlänglich bekannt. Ihr Einsatz beschränkt sich im wesentlichen auf den sogenannten akustisch eindi mensionalen Fall, also dort, wo die Schallausbreitung in eine definierte Richtung erfolgt. Die se Bedingungen sind beispielsweise in Lüftungskanälen gegeben. Beispiele hierfür sind zu finden in DE-OS 39 08 881, US 4473 906, US 5 278 913, US 5 418 873, US 5 420 932.Active sound attenuation devices through the generation of anti-noise are sufficient known. Their use is essentially limited to the so-called acoustically eini dimensional case, i.e. where the sound propagates in a defined direction. The For example, conditions exist in ventilation ducts. Examples of this are too can be found in DE-OS 39 08 881, US 4473 906, US 5 278 913, US 5 418 873, US 5 420 932.
Werden größere Luftmengen in Lüftungsanlagen benötigt, müssen die Kanalquerschnitte ent sprechend groß gestaltet sein, um die Strömungsgeschwindigkeit in Grenzen zu halten. Die höchste dämpfbare Frequenz mit Antischallsystemen ist abhängig von der Größe des Kanal querschnittes. Je größer der Querschnitt, desto niedriger ist die obere Grenzfrequenz. Sollen Frequenzen oberhalb dieser Grenzfrequenz gedämpft werden, sind die aktiven Schalldämp fungseinrichtungen in der bekannten Form nicht anwendbar.If larger amounts of air are required in ventilation systems, the duct cross sections must be removed be designed to be large enough to keep the flow velocity within limits. The The highest dampable frequency with anti-noise systems depends on the size of the channel cross section. The larger the cross section, the lower the upper limit frequency. Should Frequencies damped above this cutoff frequency are the active silencers tion devices in the known form not applicable.
Ziel der Erfindung ist die Verwendung von aktiven Schalldämpfungssystemen zur breitbandi gen Störschalldämpfung in Kanalanlagen mit großem Querschnitt.The aim of the invention is the use of active sound attenuation systems for broadband noise attenuation in duct systems with a large cross-section.
Das aktive Schalldämpfungssystem nach der Erfindung eignet sich aufgrund seiner Konstruk tion zur breitbandigen Störschalldämpfung in Kanalanlagen mit großem Querschnitt.The active sound attenuation system according to the invention is suitable due to its construction tion for broadband noise suppression in duct systems with a large cross-section.
Für Frequenzen über der oberen Grenzfrequenz trifft der akustisch eindimensionale Fall nicht mehr zu, die Schallausbreitung erfolgt nicht in eine definierte Richtung. Die Aufsplittung ei nes großen Kanals in mehrere Kanäle mit kleinem Einzelquerschnitt, unter Beibehaltung des Gesamtquerschnitts, löst dieses Problem. Die dämpfbare obere Grenzfrequenz des Gesamtsy stems wird auf die obere Grenzfrequenz eines kleinen Einzelkanals angehoben. Wird dabei jedoch für jeden entstandenen Einzelkanal jeweils ein aktives System eingesetzt, vervielfacht sich der Gesamtaufwand. Durch eine symmetrische Aufteilung kann von gleichen Verhältnis sen in den Einzelkanälen ausgegangen werden. Unter diesen Voraussetzungen ist der Einsatz einer einzigen Steuereinheit des aktiven Systems möglich, die ausgehend von einem Ein zelkanal, die Dämpfungsaufgabe in allen Einzelkanälen über die entsprechenden Lautsprecher durchführt. Ebenso lassen sich die Mikrofone auf die in einem Einzelkanal benötigte Anzahl reduzieren.The acoustically one-dimensional case does not apply to frequencies above the upper limit frequency more, the sound does not propagate in a defined direction. The splitting up nes large channel into several channels with a small single cross section, while maintaining the Overall cross section solves this problem. The dampable upper limit frequency of the total sy stems is raised to the upper limit frequency of a small single channel. Will be there however, an active system is used for each individual channel created, multiplied the total effort. A symmetrical division can have the same ratio can be assumed in the individual channels. Under these conditions is the use a single control unit of the active system possible, starting from an on zelkanal, the damping task in all individual channels via the corresponding loudspeakers carries out. The microphones can also be set to the number required in a single channel to reduce.
Der Vorteil der Erfindung ist eine breitbandige Störschalldämpfung in Kanalanlagen mit gro ßem Querschnitt ohne nennenswerte Druckverluste in der Gesamtanlage, bei geringstem Aufwand durch das aktive System.The advantage of the invention is broadband noise attenuation in duct systems with large ß cross-section without significant pressure losses in the overall system, with the lowest Effort through the active system.
Ausführungsbeispiele des aktiven Schalldämpfungssystems entsprechend der Erfindung sind den beigefügten Zeichnungen zu entnehmen und werden nachstehend beschrieben.Embodiments of the active sound attenuation system according to the invention are the accompanying drawings and are described below.
Skizze 1 zeigt eine bevorzugte Variante mit geringstem Platz- und Materialaufwand;Sketch 1 shows a preferred variant with the smallest space and material expenditure;
Skizze 2 zeigt eine weitere Variante am Beispiel der Aufsplittung in zwei Teilkanäle.Sketch 2 shows another variant using the example of splitting into two subchannels.
In der Skizze 1 wird ein großer Kanal (1) in zwei kleinere Teilkanäle (2) aufgesplittet, unter Beibehaltung des Gesamtquerschnittes. Das Meßmikrofon (3) nimmt den Störschall vor der Aufsplittung im großen Kanalstück auf. Die Steuereinheit (4) verarbeitet die Schallsignale und berechnet und erzeugt ein gegenphasiges Signal zur Kompensation, welches über einen Verstärker (5) auf die Lautsprecher (6) gegeben wird. Die Lautsprecher (6) strahlen den An tischall in den jeweiligen Teilkanälen dem Störschall entgegen, wodurch es bei der Überlage rung zur Auslöschung des Störschalls kommt. Ein Kontrollmikrofon (7) überprüft die Ge samtdämpfung nach der Zusammenführung der Teilkanäle im großen Kanal. Die Steuerein heit (4) optimiert das Kompensationssignal bei Bedarf.In sketch 1, a large channel ( 1 ) is split into two smaller subchannels ( 2 ) while maintaining the overall cross-section. The measuring microphone ( 3 ) picks up the noise before splitting in the large duct section. The control unit ( 4 ) processes the sound signals and calculates and generates an antiphase signal for compensation, which is sent to the loudspeakers ( 6 ) via an amplifier ( 5 ). The loudspeakers ( 6 ) radiate the table sound in the respective subchannels against the background noise, which leads to cancellation of the background noise when overlaying. A control microphone ( 7 ) checks the total attenuation after merging the subchannels in the large channel. The control unit ( 4 ) optimizes the compensation signal if necessary.
In der Skizze 2 ist eine weitere Variante des aktiven Schalldämpfungssystems dargestellt. Sie unterscheidet sich vom Bild 1 durch die Anordnung der Mikrofone in einem der Teilkanä le. Für diesen Fall muß eine größere Einbaulänge zur Verfügung stehen, einerseits zur Monta ge der Systemkomponenten, andererseits für die akustische Entkopplung der Teilkanäle. Vorteil dieser Variante ist die bessere Optimierung des Systems auf die Geräuschstatistiken der Teilkanäle.Sketch 2 shows another variant of the active noise reduction system. It differs from Figure 1 by the arrangement of the microphones in one of the subchannels. In this case, a larger installation length must be available, on the one hand for mounting the system components, and on the other hand for the acoustic decoupling of the subchannels. The advantage of this variant is the better optimization of the system based on the noise statistics of the subchannels.
Die in den Beispielen dargestellten Versionen der Aufsplittung eines großen Kanals in zwei kleinere Kanäle sind auf beliebig viele, n-fache Aufteilungen in Teilkanäle übertragbar. Bei dem Einsatz in sehr großen Querschnitten ist ein Austausch der Mikrofone (3) und (7) durch Mikrofonarrays vorteilhaft.The versions of the splitting of a large channel into two smaller channels shown in the examples can be transferred to any number of n-fold subdivisions. When used in very large cross sections, it is advantageous to replace the microphones ( 3 ) and ( 7 ) with microphone arrays.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19727617A DE19727617A1 (en) | 1997-06-28 | 1997-06-28 | Active sound absorption system for e.g. ventilation ducts |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19727617A DE19727617A1 (en) | 1997-06-28 | 1997-06-28 | Active sound absorption system for e.g. ventilation ducts |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19727617A1 true DE19727617A1 (en) | 1999-01-07 |
Family
ID=7833993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19727617A Withdrawn DE19727617A1 (en) | 1997-06-28 | 1997-06-28 | Active sound absorption system for e.g. ventilation ducts |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19727617A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10338786B4 (en) * | 2003-07-18 | 2006-03-09 | Weiss Klimatechnik Gmbh | supply air ceiling |
CN108644965A (en) * | 2018-05-11 | 2018-10-12 | 北京安声科技有限公司 | A kind of air-conditioning and the distributed active denoising method of central air-conditioning |
-
1997
- 1997-06-28 DE DE19727617A patent/DE19727617A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10338786B4 (en) * | 2003-07-18 | 2006-03-09 | Weiss Klimatechnik Gmbh | supply air ceiling |
CN108644965A (en) * | 2018-05-11 | 2018-10-12 | 北京安声科技有限公司 | A kind of air-conditioning and the distributed active denoising method of central air-conditioning |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8141 | Disposal/no request for examination |