CN201402182Y - Sound field measuring instrument - Google Patents
Sound field measuring instrument Download PDFInfo
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- CN201402182Y CN201402182Y CN2009200713569U CN200920071356U CN201402182Y CN 201402182 Y CN201402182 Y CN 201402182Y CN 2009200713569 U CN2009200713569 U CN 2009200713569U CN 200920071356 U CN200920071356 U CN 200920071356U CN 201402182 Y CN201402182 Y CN 201402182Y
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Abstract
The utility model relates to a sound field measuring instrument, which comprises a and a multi-channel collector, wherein the three-dimensional sound intensity probe comprises three pairs of sound intensity microphones and a main sound pressure microphone, pairs of the sound intensity microphones are respectively arranged on the three-dimensional coordinate axes at intervals, and the main sound pressure microphone is arranged on the origin of the three-dimensional coordinate axis; and the multi-channel collector is connected with the three-dimensional sound intensity probe for collecting signals acquired by each microphone. The sound field measuring instrument can be used for quickly and efficiently measuring broadband noises of the sound field.
Description
Technical field
The utility model relates to mechanical driver unit noise measurement field, especially relates to a kind of acoustic field instrument.
Background technology
At present, the acquisition of sound field information is except by measuring sound pressure signal, also adopting and measure sound intensity signal and obtain.Sound intensity signal more can be explained the information of sound field than sound pressure signal, and still, the efficient of sound intersity measurement at present, frequency range, operability, data message scope etc. limit its use, and sound pressure meter is still adopted in noise measurements a large amount of in the reality.
The utility model content
Technical problem to be solved in the utility model provides a kind of acoustic field instrument, is applicable to the broadband measurement sound field.
The utility model is that to solve the problems of the technologies described above the technical scheme that adopts be to propose a kind of acoustic field instrument, comprise: three-dimensional sound intensity probe, comprise three a pairs of sound intensity microphones and a main pressure microphone, every pair of sound intensity microphone is arranged on one of 3-D walls and floor the compartment of terrain respectively, and this main pressure microphone is arranged in the initial point of this 3-D walls and floor; And the multichannel collecting device, connect this three-dimensional sound intensity probe, in order to gather the signal that each microphone obtains.
In above-mentioned acoustic field instrument, above-mentioned three-dimensional sound intensity probe has a support, this support has respectively along three extension rods of 3-D walls and floor extension and the main microphone insertion pipeline that extends from the 3-D walls and floor initial point, wherein each extension rod is provided with a pair of described sound intensity microphone respectively, and this main microphone inserts pipeline and is used to insert described main pressure microphone.
In above-mentioned acoustic field instrument, the sound film of above-mentioned main pressure microphone is positioned at the initial point of 3-D walls and floor.
In above-mentioned acoustic field instrument, also comprise at least one reference sound pressure microphone, connect described multichannel collecting device, in order to gather at least one reference signal and to import described multichannel collecting device.
In above-mentioned acoustic field instrument, above-mentioned multichannel collecting device is to be made of 8 passage computer acquisition virtual instrument systems.
The utility model has increased a plurality of microphones owing to adopt above technical scheme, can be combined into the three-dimensional sound intensity probe of wideband and carry out the wideband measurement.And gather the collection that reference signal helps to replenish acoustic field signal, make sound intensity signal increase phase relation between the each point sound intensity signal.Acoustic field instrument of the present utility model can carry out the broadband noise of sound field fast and efficiently and measure.
Description of drawings
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent, below in conjunction with accompanying drawing embodiment of the present utility model is elaborated, wherein:
Figure 1A-1B is present wideband sound intensity probe structure principle chart.
Fig. 1 C-1D is according to wideband sound intensity probe structure principle chart of the present utility model.
Fig. 2 is the three-dimensional sound intensity sonde configuration of the wideband figure of the utility model one embodiment.
Fig. 3 is the pressure microphone synoptic diagram according to the utility model one embodiment.
Fig. 4 A-4C is the three-dimensional sound intensity support synoptic diagram that six microphones are housed according to the utility model one embodiment.
Fig. 5 A-5C is according to the three-dimensional sound intensity probe synoptic diagram of the wideband of the utility model one embodiment.
Fig. 6 is the wideband acoustic field instrument synoptic diagram of the utility model one embodiment.
Fig. 7 A, 7B be the utility model one embodiment increase the sound intersity measurement of reference signal and the contrast synoptic diagram of common sound intersity measurement.
Embodiment
According to an embodiment of the present utility model, in order to expand the frequency band of sound intersity measurement, on the existing basis that is used to measure a microphone of the one dimension sound intensity, increased a microphone that is used for widening frequency band, and can be combined into the three-dimensional sound intensity probe of wideband by the loquacity tube.According to an embodiment of the present utility model, can also increase the collection that the acoustic pressure reference signal is replenished acoustic field signal.
For sound intensity probe structure of the present utility model is described, present sound intensity probe structure is at first described as a comparison.Figure 1A and 1B are according to present wideband sound intensity probe structure principle chart.Microphone A, the B that it adopts a pair of (promptly two) high precision to match once finishes the sound intersity measurement of certain point in the three dimensions.The spacing of every microphone and precision have determined the operating frequency range of sound intensity probe.Three-dimensional sound intensity probe is then used the three orthogonal compositions of microphone to the pairing of (promptly six) high precision.
The sound intensity I (t) of certain point is described as in the sound field: the product of this acoustic pressure p (t) and this air particle velocity v (t), I (t)=p (t) v (t).
When a microphone that uses Figure 1A was measured the sound intensity, microphone A and microphone B measured sound pressure signal pA (t), pB (t) respectively, and the sound pressure signal p (t) of microphone A and microphone B intermediate point gets the mean value of pA (t) and pB (t), promptly
p(t)＝(pA(t)+pB(t))/2。
Particle velocity v (t) is proportional to microphone A and microphone B measures the poor integration of sound pressure signal p1 (t), p2 (t) respectively, promptly
v(t)＝(∫(pB(t)-pA(t))dt)/(ρL)
ρ is a gas density in the formula, and L is the distance of two microphones.The distance L of two microphones has determined the operating frequency range of two microphone sound intensity probes, shown in curve F (L) in the sound intensity-frequency spectrogram of Figure 1B.
By contrast, shown in Fig. 1 C and 1D, microphone, formation one group of three microphone A1, A2, the B that an embodiment of the present utility model adopts one of increase to be used for widening frequency band constitutes the sound intensity probe of wideband, once finishes the one dimension sound intersity measurement of the broadening frequency range of space point.Present embodiment is equally applicable to three-dimensional sound intensity probe and makes up, and is used for the three-dimensional sound intersity measurement of wideband.
When adopting three microphones shown in Fig. 1 C to come the operating frequency range of broadening sound intensity probe, microphone A1, microphone A2 and microphone B measure sound pressure signal pA1 (t), pA2 (t), pB (t) respectively, the sound pressure signal p1 (t) of microphone A1 and microphone B intermediate point gets the mean value of pA1 (t) and pB (t), promptly
p1(t)＝(pA1(t)+pB(t))/2。
Particle velocity v1 (t) is proportional to the integration that microphone A1 and microphone B measure the difference of sound pressure signal pA1 (t), pB (t) respectively, promptly
v(t)＝(∫(pB(t)-pA1(t))dt)/(ρL1)。
ρ is a gas density in the formula, and L1 is the distance of two microphone A1 microphone B.Because the distance L 1 of two microphones has determined the operating frequency range of two microphone sound intensity probes, shown in curve F (L1) in the sound intensity-frequency spectrogram of figure D.In like manner, the sound pressure signal p1 (t) of microphone A2 and microphone B intermediate point gets the mean value of pA2 (t) and pB (t), promptly
p2(t)＝(pA2(t)+pB(t))/2。
Particle velocity v2 (t) is proportional to the integration that microphone A2 and microphone B measure the difference of sound pressure signal pA2 (t), pB (t) respectively, promptly
v2(t)＝(∫(pB(t)-pA2(t))dt)/(ρL2)
ρ is a gas density in the formula, and L2 is the distance of two microphone A2 microphone B.Because the distance L 2 of two microphones has determined the operating frequency range of two microphone sound intensity probes, shown in curve F (L2) in the sound intensity-frequency spectrogram of Fig. 1 D.
Relatively the sound intensity-frequency spectrogram of Figure 1B and Fig. 1 D as can be known, present embodiment is by the operating frequency range of sound intensity probe that increased a microphone broadening.And, owing to measure the sound intensity, therefore can reduce the requirement of microphone precision, thereby reduce manufacturing cost with two groups of microphones.
Fig. 2 is the three-dimensional sound intensity sonde configuration of the wideband figure of the utility model one embodiment.It is to make up according to the one dimension sound intensity probe shown in Fig. 1 C to form.With reference to shown in Figure 2, the three-dimensional sound intensity probe 10 of the wideband of present embodiment adopts four microphone AX, AY, AZ, A to form three pairs of sound intensity microphones, and other increases by survey frequency and amplitude range that three microphone BX, BY, BZ come the broadening sound intensity.Wherein, microphone AX, AY, AZ lay respectively on mutually perpendicular in twos 3-D walls and floor X, Y, the Z, and microphone BX, BY, BZ also lay respectively at 3-D walls and floor X, Y, Z.Microphone A then is positioned at the initial point of 3-D walls and floor, is that three-dimensional sound field is measured multiplexing microphone.
As mentioned before, because each dimension all use two groups of microphones to measure the sound intensitys, so the three-dimensional sound intensity probe of the wideband of present embodiment can reduce the precision of microphone, thus the reduction manufacturing cost.
Fig. 3, Fig. 4 A-4C, Fig. 5 A-5C illustrate the actual pie graph of the three-dimensional sound intensity probe of the utility model one embodiment.Shown in Fig. 4 A-4C, a three-dimensional sound intensity support 11 that six microphones are housed is provided, it all has extension rod 12 on each dimension of X, Y, Z, and extends main microphone insertion pipeline 13 from the intersection point of extension rod.On each extension rod 12 microphone is set.Every microphone is same distance installation at interval face-to-face, such as 10 millimeters.Shown in Fig. 5 A-5C, pressure microphone shown in Figure 3 is inserted three-dimensional sound intensity support 11 middle main microphones as main pressure microphone A insert in the pipeline 13, form the three-dimensional sound intensity probe of wideband.Wherein main pressure microphone A sound film 14 be positioned at the initial point of 3-D walls and floor just.
Fig. 6 is the wideband acoustic field instrument synoptic diagram of the utility model one embodiment.With reference to shown in Figure 6, this wideband acoustic field instrument 100 comprises the three-dimensional sound intensity probe 10 of above-mentioned wideband, reference sound pressure microphone 20 and a multichannel collecting device 30.This multichannel collecting device 30 connects 10 grades of reference sound pressure probes 20 of the three-dimensional sound intensity probe of wideband, it for example is to be made of 8 passage computer acquisition virtual instrument systems, can be used to gather 1 signal that the three-dimensional sound intensity probe 10 of wideband gathered 7 signals and reference sound pressure microphone 20 are gathered.
What deserves to be mentioned is that reference signal is not gathered in common sound intersity measurement.And preferably, present embodiment adopts reference sound pressure microphone 20 to gather the collection that reference signal is replenished acoustic field signal.In embodiment of the present utility model, the reference signal of increase can be one or more, can be noise signal, vibration signal or tach signal.Increase reference signal, made more than the sound intensity signal phase relation between the each point sound intensity signal.Fig. 7 A shows that employing increase reference signal measures the phase place between the sound intensity and measuring point, and Fig. 7 B shows the sound intensity figure of the no phase information that the employing conventional method measures.
The acoustic field instrument of the utility model the foregoing description adopts a plurality of microphones of increase to expand frequency range, and gathers the collection that reference signal is replenished acoustic field signal, thereby can carry out the broadband noise measurement of sound field fast and efficiently.The utility model can use in the actual measurement of building, mechanical hook-up vibration and noise reducing and research, has fast and the high characteristics of precision.
Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.
Claims (5)
1. acoustic field instrument is characterized in that comprising:
Three-dimensional sound intensity probe comprises three a pairs of sound intensity microphones and a main pressure microphone, and every pair of sound intensity microphone is arranged on one of 3-D walls and floor the compartment of terrain respectively, and this main pressure microphone is arranged in the initial point of this 3-D walls and floor; And
The multichannel collecting device connects this three-dimensional sound intensity probe, in order to gather the signal that each microphone obtains.
2. acoustic field instrument as claimed in claim 1, it is characterized in that, described three-dimensional sound intensity probe has a support, this support has respectively along three extension rods of 3-D walls and floor extension and the main microphone insertion pipeline that extends from the 3-D walls and floor initial point, wherein each extension rod is provided with a pair of described sound intensity microphone respectively, and this main microphone inserts pipeline and is used to insert described main pressure microphone.
3. acoustic field instrument as claimed in claim 2 is characterized in that, the sound film of wherein said main pressure microphone is positioned at the initial point of 3-D walls and floor.
4. acoustic field instrument as claimed in claim 1 is characterized in that, also comprises at least one reference sound pressure microphone, connects described multichannel collecting device, in order to gather at least one reference signal and to import described multichannel collecting device.
5. acoustic field instrument as claimed in claim 4 is characterized in that, described multichannel collecting device is to be made of 8 passage computer acquisition virtual instrument systems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200713569U CN201402182Y (en) | 2009-04-29 | 2009-04-29 | Sound field measuring instrument |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009200713569U CN201402182Y (en) | 2009-04-29 | 2009-04-29 | Sound field measuring instrument |
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| CN2009200713569U Expired - Fee Related CN201402182Y (en) | 2009-04-29 | 2009-04-29 | Sound field measuring instrument |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011117440A1 (en) * | 2010-03-24 | 2011-09-29 | Universidad Rey Juan Carlos | Sound-capture system |
| CN102523057A (en) * | 2011-12-27 | 2012-06-27 | 中国船舶重工集团公司第七一五研究所 | Method for calibrating sound pressure in low-frequency sound wave free field |
| CN103063293A (en) * | 2013-01-15 | 2013-04-24 | 杭州成功超声电源技术有限公司 | Circuit applied to sound intensity measurement of ultrasonic waves |
| CN111504446A (en) * | 2020-04-03 | 2020-08-07 | 武汉理工大学 | Test system for surface sound intensity distribution on automatic scanning equipment |
-
2009
- 2009-04-29 CN CN2009200713569U patent/CN201402182Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011117440A1 (en) * | 2010-03-24 | 2011-09-29 | Universidad Rey Juan Carlos | Sound-capture system |
| ES2365475A1 (en) * | 2010-03-24 | 2011-10-06 | Universidad Rey Juan Carlos (50%) | Sound-capture system |
| CN102523057A (en) * | 2011-12-27 | 2012-06-27 | 中国船舶重工集团公司第七一五研究所 | Method for calibrating sound pressure in low-frequency sound wave free field |
| CN102523057B (en) * | 2011-12-27 | 2015-01-07 | 中国船舶重工集团公司第七一五研究所 | Method for calibrating sound pressure in low-frequency sound wave free field |
| CN103063293A (en) * | 2013-01-15 | 2013-04-24 | 杭州成功超声电源技术有限公司 | Circuit applied to sound intensity measurement of ultrasonic waves |
| CN103063293B (en) * | 2013-01-15 | 2014-08-20 | 杭州成功超声电源技术有限公司 | Circuit applied to sound intensity measurement of ultrasonic waves |
| CN111504446A (en) * | 2020-04-03 | 2020-08-07 | 武汉理工大学 | Test system for surface sound intensity distribution on automatic scanning equipment |
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Granted publication date: 20100210 Termination date: 20140429 |