DE102010056067A1 - Method for receiving sound pressure signals of e.g. excavator, involves filling inner chamber of closed testing environment with medium, where sound with velocity is propagated in medium as in air - Google Patents
Method for receiving sound pressure signals of e.g. excavator, involves filling inner chamber of closed testing environment with medium, where sound with velocity is propagated in medium as in air Download PDFInfo
- Publication number
- DE102010056067A1 DE102010056067A1 DE102010056067A DE102010056067A DE102010056067A1 DE 102010056067 A1 DE102010056067 A1 DE 102010056067A1 DE 102010056067 A DE102010056067 A DE 102010056067A DE 102010056067 A DE102010056067 A DE 102010056067A DE 102010056067 A1 DE102010056067 A1 DE 102010056067A1
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- Germany
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- sound
- medium
- pressure signals
- air
- sound source
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/80—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves
- G01S3/802—Systems for determining direction or deviation from predetermined direction
- G01S3/803—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived from receiving transducers or transducer systems having differently-oriented directivity characteristics
- G01S3/8034—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived from receiving transducers or transducer systems having differently-oriented directivity characteristics wherein the signals are derived simultaneously
- G01S3/8036—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived from receiving transducers or transducer systems having differently-oriented directivity characteristics wherein the signals are derived simultaneously derived directly from separate directional systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/18—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using ultrasonic, sonic, or infrasonic waves
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zum Aufnehmen von Schalldrucksignalen eines einen akustischen Schall emittierenden Objekts mittels mehrerer voneinander beabstandeter und auf das Objekt gerichteter Mikrofone eines Mikrofonarrays und Auswerten der Schalldrucksignale, um hieraus die Schallquellenpositionen und die Schallquellenstärken abzuleiten.The invention relates to a method for recording sound pressure signals of an acoustic sound emitting object by means of a plurality of spaced apart and directed to the object microphones of a microphone array and evaluating the sound pressure signals in order to deduce therefrom the sound source positions and the sound source strengths.
Bei einem derartigen Verfahren werden Schalldrucksignale von den Mikrofonen des Mikrofonarrays einzeln erfaßt und daraus die Schallquellenpositionen und Schallquellenstärken ermittelt.In such a method, sound pressure signals are detected individually by the microphones of the microphone array and the sound source positions and sound source strengths are determined therefrom.
Auf diese Weise können für die verschiedenen Bereiche des den akustischen Schall emittierenden Objekts die Schallquellenstärken festgestellt und so die Bereiche der größten Schallemissionen bestimmt werden.In this way, the sound source strengths can be determined for the different regions of the object emitting the acoustic sound and thus the areas of the greatest noise emissions can be determined.
Sind die Frequenzen der Schalldrücke tiefe Frequenzen oder hohe Frequenzen, so ist die Lokalisierung der Schaltquelle nur grob möglich.If the frequencies of the sound pressures are low frequencies or high frequencies, the localization of the switching source is only roughly possible.
Aufgabe der Erfindung ist es daher ein Verfahren der eingangs genannten Art zu schaffen, das bei hohen oder tiefen Frequenzen des von dem Objekt ermittelten Schalls eine präzise Lokalisierung der Schaltquellen und Schaltquellenstärken ermöglicht.The object of the invention is therefore to provide a method of the type mentioned above, which enables precise localization of the switching sources and switching source strengths at high or low frequencies of the sound determined by the object.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß zur Aufnahme der Schalldrucksignale das Objekt innerhalb einer geschlossenen Prüfumgebung angeordnet und der Innenraum der geschlossenen Prüfumgebung mit einem Medium gefüllt wird, in dem sich der von dem Objekt emittierte Schall in anderer Geschwindigkeit ausbreitet, als in Luft.This object is achieved in that arranged to receive the sound pressure signals, the object within a closed test environment and the interior of the closed test environment is filled with a medium in which propagates the sound emitted by the object at a different speed, than in air.
Durch die Verwendung eines anderen das Objekt umgebenden Mediums als Luft verändert sich auch die Schallgeschwindigkeit, mit der sich die Schallwellen ausbreiten und damit auch die Schallwellenlänge.By using another medium surrounding the object as air, the speed of sound propagates with which the sound waves propagate and thus also the sound wave length.
Damit kann abhängig von dem das Objekt umgebenden Medium die Schallwellengeschwindigkeit entsprechend diesem Medium gewählt werden, die für die zu erfassende Frequenz geeignet ist, am genausten durch die Mikrofone erfaßt zu werden.Thus, depending on the medium surrounding the object, the sound wave velocity corresponding to this medium, which is suitable for the frequency to be detected, can be most accurately detected by the microphones.
Damit wird auch eine örtlich höhere Auflösung und damit präzisere Lokalisierung der Schaltquellen erreicht.This also achieves a locally higher resolution and thus more precise localization of the switching sources.
Die geschlossene Prüfumgebung kann dabei eine geschlossene Kammer sein, die einfacher Weise eine Folienkammer sein kann.The closed test environment can be a closed chamber, which can easily be a foil chamber.
In besonders einfacher Weise kann eine Füllung der Prüfumgebung erfolgen, wenn der Innenraum der Prüfumgebung mit einem Gas gefüllt ist.In a particularly simple manner can be done a filling of the test environment when the interior of the test environment is filled with a gas.
Sind dabei die zu erfassenden Frequenzen niedrig, ist vorzugsweise das Gas ein Gas, in dem sich der von dem Objekt emittierte Schall mit geringerer Geschwindigkeit ausbreitet, als in Luft.If the frequencies to be detected are low, the gas is preferably a gas in which the sound emitted by the object propagates at a lower speed than in air.
Durch die höhere örtliche Auflösung können die Geräusche der festen Frequenzen im Medium mit geringerer Schallgeschwindigkeit als Luft genauer kartiert oder Geräusche mit tieferen Frequenzen mit der gleichen Genauigkeit wie im Medium Luft kartiert werden.The higher spatial resolution allows the noises of the fixed frequencies in the medium to be mapped more accurately at lower speeds of sound than air, or to mimic noises at lower frequencies with the same accuracy as in the medium of air.
Unter niedrigen Frequenzen werden Frequenzen in der Größenordnung von f < 300 Hz, insbesondere f < 500 Hz verstanden.Low frequencies are understood to mean frequencies of the order of f <300 Hz, in particular f <500 Hz.
Besonders vorteilhaft sind dabei Gase, die gegenüber Luft eine etwa halb so große Wellenlänge aufweisen wie z. B. Xenon oder Chlor oder Brom.Particularly advantageous are gases which have an approximately half the wavelength of air as z. As xenon or chlorine or bromine.
Eine andere Möglichkeit für das die Prüfumgebung füllende Medium besteht darin, daß der Innenraum der Prüfumgebung mit einem Feststoff gefüllt, wobei der Feststoff ein Feststoff sein kann, in dem sich der von dem Objekt emittierte Schall mit geringerer Geschwindigkeit ausbreitet, als in Luft.Another possibility for the medium filling the test environment is that the interior of the test environment is filled with a solid, wherein the solid may be a solid in which the sound emitted by the object propagates at a lower velocity than in air.
Vorzugsweise kann dabei der Feststoff Gummi oder Weich-PVC sein.Preferably, the solid may be rubber or plasticized PVC.
Werden die Schallquellenpositionen und die Schallquellenstärken auf einem Display die Schalldrucksignale visualisierend als Schallkartierung dargestellt, so können die Positionen der Hauptschallquellen des Objekts auf einfache Weise erkennbar gemacht werden.If the sound source positions and the sound source strengths are visualized as sound mapping on a display, the positions of the main sound sources of the object can be made easily recognizable.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben.An embodiment of the invention is illustrated in the drawing and will be described in more detail below.
Die einzige Figur der Zeichnung zeigt eine schematische Darstellung eines Systems zum Aufnehmen von Schalldrucksignalen eines einen akustischen Schall emittierenden Objekts.The sole figure of the drawing shows a schematic representation of a system for recording sound pressure signals of an acoustic sound emitting object.
Das dargestellte System weist ein Mikrofonarray
Das Mikrofonarray
Das Objekt
Bei entsprechender Größe der Kammer
Während des Betriebes des Objekts, bei dem durch das Objekt akustischer Schall emittiert wird, werden die Schalldrucksignale von den Mikrofonen
Die Mikrofone
Dadurch ergeben sich bei unterschiedlichen Schallemissionen an den unterschiedlichen Schallquellenpositionen auch unterschiedliche Schallquellenstärken, die von der Auswerteeinheit
Diese Schallquellenstärken werden eine Schallkartierung bildend an den Schallpositionen entsprechenden Positionen auf einem Display
Dabei können die unterschiedlichen Schallquellenstärken durch entsprechend unterschiedliche Farben darstellbar sein.The different sound source strengths can be represented by correspondingly different colors.
Die Kammer
Da die Schallgeschwindigkeit in Xenon 170 m/s beträgt und in Luft 343 m/s, erfolgt eine Schallübertragung in Xenon mit halb so großer Wellenlänge als in Luft.Since the speed of sound in xenon is 170 m / s and in air 343 m / s, xenon sound is transmitted at half the wavelength of that in air.
Damit sind selbst tieffrequente Geräusche des Objekts mit wesentlich höherer örtlicher Auflösung als bei einer mit Luft gefüllten Kammer
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE102010056067A DE102010056067A1 (en) | 2010-12-23 | 2010-12-23 | Method for receiving sound pressure signals of e.g. excavator, involves filling inner chamber of closed testing environment with medium, where sound with velocity is propagated in medium as in air |
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DE102010056067A DE102010056067A1 (en) | 2010-12-23 | 2010-12-23 | Method for receiving sound pressure signals of e.g. excavator, involves filling inner chamber of closed testing environment with medium, where sound with velocity is propagated in medium as in air |
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DE102010056067A1 true DE102010056067A1 (en) | 2012-06-28 |
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DE102010056067A Withdrawn DE102010056067A1 (en) | 2010-12-23 | 2010-12-23 | Method for receiving sound pressure signals of e.g. excavator, involves filling inner chamber of closed testing environment with medium, where sound with velocity is propagated in medium as in air |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116819446A (en) * | 2023-08-29 | 2023-09-29 | 深圳市中志环境科技有限公司 | Environmental noise on-line monitoring system based on noise source localization |
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- 2010-12-23 DE DE102010056067A patent/DE102010056067A1/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116819446A (en) * | 2023-08-29 | 2023-09-29 | 深圳市中志环境科技有限公司 | Environmental noise on-line monitoring system based on noise source localization |
CN116819446B (en) * | 2023-08-29 | 2023-11-14 | 深圳市中志环境科技有限公司 | Environmental noise on-line monitoring system based on noise source localization |
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