CN109900788A - A kind of device and measurement method can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement - Google Patents
A kind of device and measurement method can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement Download PDFInfo
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Abstract
The present invention relates to acoustic measuring technique fields, more particularly to a kind of device and measurement method that can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement, it can be used for carrying out the device of in-site measurement to the sound absorption characteristics of acoustical material including signal generator, array processor, transducer array, data acquisition device, data processing equipment and measured material, signal generator connects array processor by conducting wire.Measuring device of the invention has the guide rail of graduation mark in the addition of transducer array center, can be realized the measurement of distance between measured material surface and microphone (acoustic measurement probe)；Microphone arm in apparatus of the present invention is flexibly connected with guide rail, can be realized the light transformation of microphone (acoustic measurement probe) position, to eliminate the mismatch problems of Measurement channel；Apparatus of the present invention can complete the in-site measurement to material sound absorption characteristics without cutting to material under the conditions of the actual installation of acoustical material.
Description
Technical field
The present invention relates to acoustical material field of measuring technique more particularly to a kind of sound absorption characteristics that can be used for acoustical material
Carry out the device and measurement method of in-site measurement.
Background technique
With the improvement of living standards, requirement of the people to sound environment quality is also higher and higher.In practical engineering applications,
Sound-absorbing material and sound absorption structure are widely used in acoustical design and noise control.Acoustic absorptivity and acoustic impedance reflect material
Macrosonics characteristic, be the Important Theoretic Foundation of noise control and acoustics design.The sound absorption characteristics of acoustical material not only with material
Expect that the characteristic of itself is related, whether there is or not the condition of the actual installations such as cavity, cavity size is related behind when also installing with material.Impedance
The result that the traditional experiments such as tube method and Reverberation room method room method measures can not completely reaction material in actual application
Sound absorption characteristics.Therefore how to acoustical material, the in-site measurement of sound absorption characteristics is to improve acoustic environment matter under actual installation scene
Measure a horizontal major issue.
In response to this problem, a kind of device and measurement that can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement is designed
Method.
Summary of the invention
The purpose of the present invention is to provide a kind of devices that can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement
And measurement method, to solve the above technical problems.
The present invention using following technical scheme in order to solve the above technical problems, realized:
A kind of device can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement, including signal generator, array
Processor, transducer array, data acquisition device, data processing equipment and measured material,
Signal generator connects array processor by conducting wire, and array processor connects transducer array, institute by conducting wire
It states transducer array and forms linear array, face array or volume array, the data by centainly putting in order by multiple transducer units
Acquisition device is made of microphone (acoustic measurement probe), signal conditioner and signal adapter, and microphone (visit by acoustic measurement
Head) by conducting wire connection signal conditioner, signal conditioner is by conducting wire connection signal adapter, and the microphone (survey by acoustics
Amount probe) it is made of microphone A and microphone B, the data processing equipment is made of data processor, the measured material
It is formed about measured material surface region；
The microphone A and microphone B is arranged on the slide rail by microphone arm, offers scale on the sliding rail
Line, sliding rail are pivotally connected transducer array, and the sliding rail is connected with measured material bracket, and the microphone arm includes the first U-shaped cunning
Plate, the first U-shaped slide plate slides connection on the slide rail, the first U-shaped slide plate by lock-screw fixation on the slide rail, described the
The upper end of one U-shaped slide plate is connected with graduated scale, and being slidably connected on the graduated scale, there are two the second U-shaped slide plate, the second U-shaped slide plates
Fixed on the scale by locking nut, the upper end of two the second U-shaped slide plates is separately connected microphone A and microphone B.
Preferably, the transducer unit can be ultrasonic piezo-transducer unit or moving-coil type electroacoustic loudspeaker unit
And lightweight diaphragm or conical diaphragm can be used in combination, the single transducer in transducer unit.
Preferably, the lower end of the described first U-shaped slide plate and the second U-shaped slide plate is respectively connected with measuring block.
Preferably, the microphone (acoustic measurement probe) includes the microphone probe or measurement acoustic pressure matter for measuring acoustic pressure
Spot speed (PU) probe and combination.
A kind of measurement method can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement, comprising the following steps:
(1) measured material and measured material bracket are offseted, transducer array face measured material surface is placed, the two
The distance between for 50cm or so；
(2) microphone A and microphone B are fixed on microphone arm, microphone A or transaudient is adjusted by locking nut
The distance between device B and measured material l, distance are 1cm or so；
(3) the spacing d between microphone A and microphone B is adjusted by locking nut, spacing is 2cm or so；
(4) microphone A and microphone B location are adjusted, makes microphone A and microphone B with transducer array center same
On straight line, and microphone A and microphone B are parallel with measured material surface；
(5) the sound absorbing performance frequency range of signal generator measurement according to needed for measured material plays a certain frequency bandwidth
Audio signal；
(6) array processor is using an audio signal of sound field rebuilding algorithm process signal generator to generate one group of sound
Frequency signal, one or more transducer units in this group of audio-signal-driven transducer array on measured material surface to carry out
Plane wave sound field rebuilding；
(7) microphone in data acquisition device (acoustic measurement probe) picks up the sound pressure signal of position, through believing
Number conditioner and signal adapter are improved and are adapted to, improve be adapted to after signal data through data processor in processing unit
It is handled, exports the acoustic impedance and acoustic absorptivity of measured material within the scope of measurement frequency；
(8) microphone arm is overturn 180 °, makes microphone A and biography by the fastening screw for unclamping microphone arm and sliding rail
The location swap of sound device B repeats step (2) (3) (4) (5) (6) (7).
Preferably, the sound pressure signal of the microphone A and microphone B measured according to step (7) and step (8), uses
Following method calculates acoustic impedance, reflection coefficient and the acoustic absorptivity of measured material:
(1) it setting apart from the measured material position closer microphone A as position 1, the position microphone B is position 2,
The sound pressure signal that then first time microphone A and microphone B are measured is respectivelySound pressure signal point is measured for the second time
It is notFourier transformation is done to the sound pressure signal measured twice and obtains multiple sound pressure signalCarrying out adding window and average treatment appropriate to multiple sound pressure signal can effectively inhibit
Random error caused by noise；
(2) transmission function that microphone position 2 arrives position 1 is calculated using multiple acoustic pressure obtained in step (1)
Wherein S11(f) composing certainly for sound pressure signal multiple at position 1, S22(f) composing certainly for sound pressure signal multiple at position 2, S12
(f) cross-spectrum of position 2, S are arrived for position 121(f) cross-spectrum of position 1, the calculation formula of cross-spectrum are arrived for position 2 are as follows:
Wherein p1(f) the multiple acoustic pressure measured for microphone at position 1,Multiple acoustic pressure is measured for microphone at position 2
Conjugate；
(3) microphone position 2 is calculated separately to 1 transmission function of position according to measurement result twice It is right
Channel Mismatch is corrected later position 2 to the transmission function of position 1 are as follows:
(4) it combines the microphone spacing d measured in above content and microphone A to the distance l of measured material, calculates quilt
It measures and monitor the growth of standing timber the reflection coefficient of material:
Wherein k is wave number, and the specific acoustic impedance on measured material surface may further be calculated according to the reflection coefficient of material
Than the Z and acoustic absorptivity α of material:
α (f)=1- | R (f) |2。
The beneficial effects of the present invention are:
Measuring device of the invention has the guide rail of graduation mark in the addition of transducer array center, can be realized measured material
The measurement of distance between surface and microphone (acoustic measurement probe)；Microphone arm and guide rail activity in apparatus of the present invention connect
It connects, can be realized the light transformation of microphone (acoustic measurement probe) position, to eliminate the mismatch problems of Measurement channel；This hair
Bright device can be completed to show material sound absorption characteristics under the conditions of the actual installation of acoustical material without cutting material
Field measurement.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is partial structurtes enlarged diagram of the invention；
Appended drawing reference: 1- signal generator；2- array processor；3- transducer array；31- transducer unit；4- data
Acquisition device；41- microphone (acoustic measurement probe)；411- microphone A；412- microphone B；42- signal conditioner；43- letter
Number adapter；5- data processing equipment；51- data processor；6- measured material bracket；7- sliding rail；8- microphone arm；81-
First U-shaped slide plate；82- graduated scale；The U-shaped slide plate of 83- second；9- measured material；10- measured material surface region.
Specific embodiment
In order to be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, tie below
Specific embodiments and the drawings are closed, the present invention is further explained, and however, the following embodiments are merely preferred embodiments of the present invention, not
All.Based on the implementation example in the implementation mode, those skilled in the art are obtained without making creative work
Other embodiments belong to protection scope of the present invention.
Specific embodiments of the present invention are described with reference to the accompanying drawing.
As shown in Figs. 1-2, a kind of device can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement, including signal
Generator 1, array processor 2, transducer array 3, data acquisition device 4, data processing equipment 5 and measured material 9,
Signal generator 1 connects array processor 2 by conducting wire, and array processor 2 connects transducer array by conducting wire
3, transducer array 3 forms linear array, face array or volume array, energy converter by centainly putting in order by multiple transducer units 31
Unit 13 can be ultrasonic piezo-transducer unit or moving-coil type electroacoustic loudspeaker unit and combination, energy converter list
Lightweight diaphragm or conical diaphragm can be used in single transducer in member 13, and data acquisition device 4 by microphone, (visit by acoustic measurement
Head) 41, signal conditioner 42 and signal adapter 43 form, microphone (acoustic measurement probe) 41 passes through conducting wire connection signal tune
Device 42 is managed, for signal conditioner 42 by conducting wire connection signal adapter 43, microphone (acoustic measurement probe) 41 includes measurement sound
The microphone of pressure is popped one's head in or measurement acoustic pressure particle velocity (PU) is popped one's head in and combination, microphone (acoustic measurement probe)
41 are made of microphone A411 and microphone B412, and data processing equipment 5 is made of data processor 51, measured material 9 it is attached
It is close to form measured material surface region 10；
Microphone A411 and microphone B412 is arranged on sliding rail 7 by microphone arm 8, offers scale on sliding rail 7
Line, sliding rail 7 are pivotally connected transducer array 3, and sliding rail 7 is connected with measured material bracket 6, and microphone arm 8 includes the first U-shaped slide plate
81, the first U-shaped slide plate 81 is slidably connected on sliding rail 7, and the first U-shaped slide plate 81 is fixed on sliding rail 7 by lock-screw, and first
The upper end of U-shaped slide plate 81 is connected with graduated scale 82, and being slidably connected on graduated scale 82, there are two the second U-shaped slide plate 83, the second U-shaped cunnings
Plate 83 is fixed on graduated scale 82 by locking nut, the upper end of two the second U-shaped slide plates 83 be separately connected microphone A411 and
The lower end of microphone B412, the first U-shaped slide plate 81 and the second U-shaped slide plate 83 is respectively connected with measuring block.
A kind of measurement method can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement, comprising the following steps:
(1) measured material 9 and measured material bracket 6 are offseted, 3 face measured material of transducer array, 9 surface are placed,
Distance between the two is 50cm or so；
(2) microphone A411 and microphone B412 are fixed on microphone arm 8, microphone is adjusted by locking nut
A411 or the distance between microphone B412 and measured material 9 l, distance are 1cm or so；
(3) the spacing d between microphone A411 and microphone B412 is adjusted by locking nut, spacing is 2cm or so；
(4) microphone A411 and the position microphone B412 are adjusted, microphone A411 and microphone B412 and transducer array are made
On the same line, and microphone A411 and microphone B412 are parallel with 9 surface of measured material at column 3 center；
(5) the sound absorbing performance frequency range of the measurement according to needed for measured material 9 of signal generator 1 plays a certain frequency bandwidth
Audio signal；
(6) array processor 2 is using an audio signal of sound field rebuilding algorithm process signal generator 1 to generate one group
Audio signal, one or more transducer units 31 in this group of audio-signal-driven transducer array 3 are in 9 table of measured material
Face carries out plane wave sound field rebuilding；
(7) microphone in data acquisition device 4 (acoustic measurement probe) 41 picks up the sound pressure signal of position, warp
Signal conditioner 42 and signal adapter 43 are improved and are adapted to, improve be adapted to after signal data through in processing unit 5 number
It is handled according to processor 51, exports the acoustic impedance and acoustic absorptivity of measured material 9 within the scope of measurement frequency；
(8) microphone arm 8 is overturn 180 °, makes microphone by the fastening screw for unclamping microphone arm 8 and sliding rail 7
The location swap of A411 and microphone B412 repeat step (2) (3) (4) (5) (6) (7).
According to the sound pressure signal of microphone A411 and microphone B412 that step (7) and step (8) measure, using such as lower section
Acoustic impedance, reflection coefficient and the acoustic absorptivity of method calculating measured material 9:
(1) it sets apart from 9 position closer microphone A411 of measured material as position 1, the position microphone B412
For position 2, then the sound pressure signal that first time microphone A411 and microphone B412 are measured is respectivelySecond
Measuring sound pressure signal is respectivelyFourier transformation is done to the sound pressure signal measured twice and obtains multiple acoustic pressure
SignalCarrying out adding window and average treatment appropriate to multiple sound pressure signal can be effective
Inhibit random error caused by noise；
(2) transmission function that microphone position 2 arrives position 1 is calculated using multiple acoustic pressure obtained in step (1)
Wherein S11(f) composing certainly for sound pressure signal multiple at position 1, S22(f) composing certainly for sound pressure signal multiple at position 2, S12
(f) cross-spectrum of position 2, S are arrived for position 121(f) cross-spectrum of position 1, the calculation formula of cross-spectrum are arrived for position 2 are as follows:
Wherein p1(f) the multiple acoustic pressure measured for microphone at position 1,Multiple acoustic pressure is measured for microphone at position 2
Conjugate；
(3) microphone position 2 is calculated separately to 1 transmission function of position according to measurement result twice It is right
Channel Mismatch is corrected later position 2 to the transmission function of position 1 are as follows:
(4) it combines the microphone spacing d measured in above content and microphone A to the distance l of measured material 9, calculates
The reflection coefficient of measured material 9:
Wherein k is wave number, and the specific acoustic impedance on 9 surface of measured material may further be calculated according to the reflection coefficient of material
Than the Z and acoustic absorptivity α of material:
α (f)=1- | R (f) |2。
For the method that the measuring device that the present invention will be described in detail carries out in-site measurement to material sound absorption characteristics, below with
The device carries out in-site measurement to the sound absorption characteristics of the melamine foamed plastic of 5cm thickness in semianechoic room comprising following steps:
(1) melamine foamed plastic and measured material bracket 6 are offseted, 3 face measured material of transducer array, 9 surface is put
It sets, distance between the two is 50cm；
(2) microphone A411 and microphone B412 are fixed on microphone arm 8, microphone is adjusted by locking nut
A411 or the distance between microphone B412 and melamine foamed plastic l, distance are 1cm；
(3) the spacing d, spacing 2cm between microphone A411 and microphone B412 are adjusted by locking nut；
(4) microphone A411 and the position microphone B412 are adjusted, microphone A411 and microphone B412 and transducer array are made
On the same line, and microphone A411 and microphone B412 are parallel with melamine foamed plastic surface at column 3 center；
(5) the sound absorbing performance frequency range of the measurement according to needed for melamine foamed plastic of signal generator 1 plays a specific frequency
The audio signal of bandwidth；
(6) array processor 2 is using an audio signal of sound field rebuilding algorithm process signal generator 1 to generate one group
Audio signal, one or more transducer units 31 in this group of audio-signal-driven transducer array 3 in melamine to steep
Foam surface carries out plane wave sound field rebuilding；
(7) microphone in data acquisition device 4 (acoustic measurement probe) 41 picks up the sound pressure signal of position, warp
Signal conditioner 42 and signal adapter 43 are improved and are adapted to, improve be adapted to after signal data through in processing unit 5 number
It is handled according to processor 51, exports the acoustic impedance and acoustic absorptivity of melamine foamed plastic within the scope of measurement frequency；
(8) microphone arm 8 is overturn 180 °, makes microphone by the fastening screw for unclamping microphone arm 8 and sliding rail 7
The location swap of A411 and microphone B412 repeat step (2) (3) (4) (5) (6) (7).
According to the sound pressure signal of microphone A411 and microphone B412 that step (7) and step (8) measure, using such as lower section
Acoustic impedance, reflection coefficient and the acoustic absorptivity of method calculating melamine foamed plastic:
(1) it sets apart from the melamine foamed plastic position closer microphone A411 as position 1, microphone B412 institute is in place
It is set to position 2, then the sound pressure signal that first time microphone A411 and microphone B412 are measured is respectivelySecond
The secondary sound pressure signal that measures is respectivelyFourier transformation is done to the sound pressure signal measured twice and obtains multiple sound
Press signalCarrying out adding window and average treatment appropriate to multiple sound pressure signal can have
Effect inhibits random error caused by noise；
(2) transmission function that microphone position 2 arrives position 1 is calculated using multiple acoustic pressure obtained in step (1)
Wherein S11(f) composing certainly for sound pressure signal multiple at position 1, S22(f) composing certainly for sound pressure signal multiple at position 2, S12
(f) cross-spectrum of position 2, S are arrived for position 121(f) cross-spectrum of position 1, the calculation formula of cross-spectrum are arrived for position 2 are as follows:
Wherein p1(f) the multiple acoustic pressure measured for microphone at position 1,Multiple acoustic pressure is measured for microphone at position 2
Conjugate；
(3) microphone position 2 is calculated separately to 1 transmission function of position according to measurement result twice It is right
Channel Mismatch is corrected later position 2 to the transmission function of position 1 are as follows:
(4) combine the microphone spacing d measured in above content and microphone A to the distance l of melamine foamed plastic, meter
Calculate the reflection coefficient of melamine foamed plastic:
Wherein k is wave number, and the acoustic resistance on melamine foamed plastic surface may further be calculated according to the reflection coefficient of material
The acoustic absorptivity α of anti-rate ratio Z and material:
α (f)=1- | R (f) |2。
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower"
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above "
Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists
Second feature " under ", " lower section " and " following " include that fisrt feature is directly below and diagonally below the second feature, or is merely representative of
First feature horizontal height is less than second feature.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
For personnel it should be appreciated that the present invention is not limited to the above embodiments, described in the above embodiment and specification is only the present invention
Preference, be not intended to limit the invention, without departing from the spirit and scope of the present invention, the present invention also has various
Changes and improvements, these changes and improvements all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by institute
Attached claims and its equivalent thereof.
Claims (6)
1. a kind of device that can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement, including signal generator (1), array
Processor (2), transducer array (3), data acquisition device (4), data processing equipment (5) and measured material (9),
It is characterized by: signal generator (1) connects array processor (2) by conducting wire, array processor (2) is connected by conducting wire
It connects transducer array (3), the transducer array (3) forms linear array by centainly putting in order by multiple transducer units (31)
Column, face array or volume array, the data acquisition device (4) is by microphone (acoustic measurement probe) (41), signal conditioner
(42) and signal adapter (43) composition, microphone (acoustic measurement probe) (41) pass through conducting wire connection signal conditioner (42),
Signal conditioner (42) is by conducting wire connection signal adapter (43), and the microphone (acoustic measurement probe) (41) is by microphone
A (411) and microphone B (412) composition, the data processing equipment (5) are made of data processor (51), the measured material
(9) measured material surface region (10) are formed near；
The microphone A (411) and microphone B (412) are arranged on sliding rail (7) by microphone arm (8), the sliding rail
(7) graduation mark is offered on, sliding rail (7) is pivotally connected transducer array (3), and the sliding rail (7) is connected with measured material bracket (6),
The microphone arm (8) includes the first U-shaped slide plate (81), and the first U-shaped slide plate (81) is slidably connected on sliding rail (7),
First U-shaped slide plate (81) is fixed on sliding rail (7) by lock-screw, and the upper end of the first U-shaped slide plate (81) is connected with quarter
It spends ruler (82), is slidably connected on the graduated scale (82) there are two the second U-shaped slide plate (83), the second U-shaped slide plate (83) passes through lock
Tight nut is fixed on graduated scale (82), and the upper end of two the second U-shaped slide plates (83) is separately connected microphone A (411) and transaudient
Device B (412).
2. the device according to claim 1 that can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement, feature
Be: the transducer unit (13) can be ultrasonic piezo-transducer unit or moving-coil type electroacoustic loudspeaker unit and two
Lightweight diaphragm or conical diaphragm can be used in the combination of person, the single transducer in transducer unit (13).
3. the device according to claim 1 that can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement, feature
Be: the lower end of the first U-shaped slide plate (81) and the second U-shaped slide plate (83) is respectively connected with measuring block.
4. the device according to claim 1 that can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement, feature
Be: the microphone (acoustic measurement probe) (41) includes the microphone probe or measurement acoustic pressure particle velocity for measuring acoustic pressure
(PU) probe and combination.
5. a kind of measurement side that can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement according to claim 1
Method, it is characterised in that: the following steps are included:
(1) measured material (9) and measured material bracket (6) are offseted, by transducer array (3) face measured material (9) surface
It places, distance between the two is 50cm or so；
(2) microphone A (411) and microphone B (412) are fixed on microphone arm (8), are adjusted by locking nut transaudient
Device A (411) or the distance between microphone B (412) and measured material (9) l, distance are 1cm or so；
(3) the spacing d between microphone A (411) and microphone B (412) is adjusted by locking nut, spacing is 2cm or so；
(4) microphone A (411) and microphone B (412) position is adjusted, microphone A (411) and microphone B (412) and transducing are made
On the same line, and microphone A (411) and microphone B (412) and measured material (9) surface are flat at device array (3) center
Row；
(5) signal generator (1) plays a certain frequency bandwidth according to the sound absorbing performance frequency range measured needed for measured material (9)
Audio signal；
(6) array processor (2) is using an audio signal of sound field rebuilding algorithm process signal generator (1) to generate one group
Audio signal, one or more transducer units (31) in this group of audio-signal-driven transducer array (3) are to be measured and monitored the growth of standing timber
Expect that (9) surface carries out plane wave sound field rebuilding；
(7) sound pressure signal that the microphone in data acquisition device (4) (acoustic measurement probe 41) picks up position, through believing
Number conditioner (42) and signal adapter (43) are improved and are adapted to, improve be adapted to after signal data through processing unit (5)
Middle data processor (51) is handled, and the acoustic impedance and acoustic absorptivity of measured material (9) within the scope of measurement frequency are exported；
(8) microphone arm (8) are overturn 180 °, make microphone A by the fastening screw for unclamping microphone arm (8) and sliding rail (7)
(411) and the location swap of microphone B (412) step (2) (3) (4) (5) (6) (7), are repeated.
6. the measurement method according to claim 5 that can be used for carrying out the sound absorption characteristics of acoustical material in-site measurement,
It is characterized in that: the sound pressure signal of the microphone A (411) and microphone B (412) measured according to step (7) and step (8),
Acoustic impedance, reflection coefficient and the acoustic absorptivity of measured material (9) are calculated with the following method:
(1) it sets apart from closer (411) position microphone A of measured material (9) as position 1, microphone B (412) institute is in place
It is set to position 2, then the sound pressure signal that first time microphone A (411) and microphone B (412) are measured is respectively
Measuring sound pressure signal for the second time is respectivelyFourier transformation is done to the sound pressure signal measured twice to obtain
Multiple sound pressure signalAdding window appropriate and average treatment energy are carried out to multiple sound pressure signal
It is enough effectively to inhibit random error caused by noise；
(2) transmission function that microphone position 2 arrives position 1 is calculated using multiple acoustic pressure obtained in step (1)
Wherein S11(f) composing certainly for sound pressure signal multiple at position 1, S22(f) composing certainly for sound pressure signal multiple at position 2, S12(f)
The cross-spectrum of position 2, S are arrived for position 121(f) cross-spectrum of position 1, the calculation formula of cross-spectrum are arrived for position 2 are as follows:
Wherein p1(f) the multiple acoustic pressure measured for microphone at position 1,The conjugation of multiple acoustic pressure is measured for microphone at position 2
Value；
(3) microphone position 2 is calculated separately to 1 transmission function of position according to measurement result twiceTo logical
Road mismatch is corrected later position 2 to the transmission function of position 1 are as follows:
(4) it combines the microphone spacing d measured in claim 5 and microphone A to the distance l of measured material (9), calculates quilt
It measures and monitor the growth of standing timber the reflection coefficients of material (9):
Wherein k is wave number, and the specific acoustic impedance ratio on measured material (9) surface may further be calculated according to the reflection coefficient of material
The acoustic absorptivity α of Z and material:
α (f)=1- | R (f) |2。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111007152A (en) * | 2019-12-24 | 2020-04-14 | 无锡吉兴汽车声学部件科技有限公司 | Acoustic performance comprehensive evaluation method and system |
| CN111289619A (en) * | 2020-03-18 | 2020-06-16 | 东风汽车集团有限公司 | Device and method for testing sound absorption performance of material |
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