CN107907595A - Sound wave oblique incidence material acoustic absorptivity and sound insulation measuring device and its measuring method - Google Patents

Sound wave oblique incidence material acoustic absorptivity and sound insulation measuring device and its measuring method Download PDF

Info

Publication number
CN107907595A
CN107907595A CN201711455921.7A CN201711455921A CN107907595A CN 107907595 A CN107907595 A CN 107907595A CN 201711455921 A CN201711455921 A CN 201711455921A CN 107907595 A CN107907595 A CN 107907595A
Authority
CN
China
Prior art keywords
microphone
tube
sound
test specimen
msub
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.)
Granted
Application number
CN201711455921.7A
Other languages
Chinese (zh)
Other versions
CN107907595B (en
Inventor
宋若龙
刘冬冰
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.)
Jilin University
Original Assignee
Jilin University
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 Jilin University filed Critical Jilin University
Priority to CN201711455921.7A priority Critical patent/CN107907595B/en
Publication of CN107907595A publication Critical patent/CN107907595A/en
Application granted granted Critical
Publication of CN107907595B publication Critical patent/CN107907595B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04Analysing solids
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)

Abstract

The present invention relates to a kind of sound wave oblique incidence material acoustic absorptivity and sound insulation measuring device and its measuring method, belong to acoustic measurement field.Loudspeaker is connected with voice tube, and the voice tube other end is connected with the first opening of tee pipe fitting;One end of reflection tube is provided with scud-absorbing treatment pipe A, and the other end is connected with the second opening of tee pipe fitting;Mounting hole is set on voice tube, reflection tube, wherein interior installation microphone.Tee pipe fitting is reduced three-way pipe fitting or equal tee pipe fitting, and the 3rd opening of reduced three-way pipe fitting is connected with test specimen cylinder, and the 3rd opening of equal tee pipe fitting is connected with reflecting one end of pipe.Advantage is:It can realize material acoustic absorptivity of the frequency from 100Hz to 1600Hz and sound insulation measurement.And sample needed for the device is small, equipment is simple, in common lab with regard to operable.

Description

Sound wave oblique incidence material acoustic absorptivity and sound insulation measuring device and its measuring method
Technical field
The present invention relates to acoustic measurement field, more particularly to a kind of sound wave oblique incidence material acoustic absorptivity and sound insulation measurement Device and its measuring method.
Background technology
With modern industry, transportation and the development of urban construction, pollution from environmental noise becomes influences maximum One of public hazards.The use of sound-absorbing material and sound insulating material is the major measure that passive control technology control noise is taken, in acoustics Aspect, the major parameter for evaluating Material acoustic performance are:Acoustic absorptivity and oise insulation factor.Acoustic absorptivity and sound insulation are measured in laboratory The method of amount mainly has:Reverberation room method and impedance tube method.
Reverberation room method measurement material acoustic absorptivity principle is by 10~12m2Test specimen be placed in 200~250m3Reverberation chamber It is interior, measure the reverberation time and calculate material acoustic absorptivity using shore formula is matched;Reverberation room method measurement material oise insulation factor principle is to make With between two close to not less than 50m3Reverberation chamber, sound source room, another Jian Zuo receiving chamber are used as between one, test specimen is placed in public metope peace Fill hole in, indoor acoustic pressure is measured using microphone, finally according to reverberation chamber oise insulation factor measure equation calculate material every Volume.
Impedance tube measurement material acoustic absorptivity method can be divided into according to measuring principle difference:Standing-wave ratio method and transmission function Method.Standing-wave ratio method is traditional impedance tube measurement material acoustic absorptivity method, and the normal incidence that material is calculated using standing-wave ratio is absorbed sound Coefficient, can only carry out single-frequency measurement, less efficient.Transfer function method is in theory of spectrum analysis and fft algorithm progressively maturation Afterwards, modern frequency spectrum analysis method is make use of, utilizes impedance tube two microphones excitation vibration material acoustic absorptivity, one-shot measurement The acoustic absorptivity of each frequency in impedance tube working frequency range can be obtained, it is efficient.
Impedance tube measurement material oise insulation factor method can be divided into according to measuring principle difference:Four-microphone method and double load methods. Four-microphone method is improved on the basis of pervious three microphones measuring method with impedance tube measurement material oise insulation factor, Method, the method that the normal incidence oise insulation factor of material is tried to achieve using transmission coefficient are separated using standing wave.Double load methods be at two kinds not Under same boundary condition, two kinds of methods for measuring to compensate four-microphone method non-ideal condition scud-absorbing treatment are carried out.
At present, sound absorption is based on above method design, reverberation chamber with sound insulating material acoustic absorptivity and oise insulation factor measuring apparatus The area of test specimen needed for method is big, and construction cost is high, should not be as the reference measure method of experimental study.Impedance tube method can only measure Material acoustic absorptivity and oise insulation factor during sound wave vertical incidence.But some materials, such as mineral wool, rock wool, material during sound wave oblique incidence The acoustic absorptivity of material has very big difference with acoustic absorptivity during sound wave vertical incidence, so material Sound absorption coefficient at oblique incidence is in work It is also the important evidence of judgement material performance in journey, therefore the measurement of sound wave oblique incidence material acoustic absorptivity is of great significance, But the appropriate method and measuring device of unspecial measurement sound wave oblique incidence material sound absorbing capabilities at present.
The content of the invention
It is an object of the invention to provide a kind of sound wave oblique incidence material acoustic absorptivity and sound insulation measuring device and its survey Amount method, solves acoustic absorptivity and oise insulation factor that impedance tube existing in the prior art is only capable of material during measurement sound wave vertical incidence The problems such as.The present invention is theoretical with pipe inner plane ripple using sound wave catadioptric principle, with reference to the advantages of reverberation chamber and impedance tube.
The above-mentioned purpose of the present invention is achieved through the following technical solutions:
Sound wave oblique incidence material acoustic absorptivity and sound insulation measuring device, it is characterised in that:Loudspeaker 1 and voice tube 3 One end is connected, and the other end of the voice tube 3 is connected with the first opening of tee pipe fitting 4;One end of reflection tube 7 is provided with sound absorption Tip tube A8, the other end are connected with the second opening of tee pipe fitting 4;Filling sucting sound material makes reflection in the scud-absorbing treatment pipe A8 The noiseless wave reflection in 7 end of pipe;Three mounting holes 6 are set on the voice tube 3, microphone is installed in two of which mounting hole 6, and Microphone front end and impedance tube --- 3 inner wall of voice tube is equal, the mandril temporary sealing that another mounting hole 6 is made by metal To prevent leak-stopping sound;Three mounting holes 6 are set on the reflection tube 7, microphone, and microphone are installed in two of which mounting hole 6 Front end and impedance tube --- 7 inner wall of reflection tube is equal, another mounting hole 6 is by the mandril temporary sealing that metal makes to prevent Leakage sound.
Angle between the voice tube 3 and reflection tube 7 is 30 °~75 °.
The tee pipe fitting 4 is reduced three-way pipe fitting, and test specimen 5 is placed in the reduced three-way pipe fitting, the reducing 3rd opening of tee pipe fitting is connected with test specimen cylinder 10, and the test specimen cylinder 10 is provided centrally with piston rod 11 and gos deep into reducing three In way pipe fitting, the piston rod 11 stretches to one end in reduced three-way pipe fitting and is equipped with backboard 9, is formed between backboard 9 and test specimen 5 One cavity, the size of the cavity are adjusted by piston rod 11;Said structure is supported by base 2, forms sound wave oblique incidence material Acoustic absorptivity measuring device;When the angle between voice tube 3 and reflection tube 7 is 30 °, 45 °, 60 °, 75 °, reduced three-way pipe fitting First opening, second opening cross section be equal diameter circle, the 3rd opening cross section for short axle it is identical, major axis is different It is oval.
The tee pipe fitting 4 is equal tee pipe fitting, and test specimen 5 is placed in the equal tee pipe fitting, described isometrical 3rd opening of tee pipe fitting is connected with reflecting one end of pipe 12, and the other end of the refraction pipe 12 is provided with scud-absorbing treatment pipe Filling sucting sound material makes the noiseless wave reflection in 12 end of refraction pipe in B13, scud-absorbing treatment pipe B13;Two are set on the refraction pipe 12 A mounting hole 6, installs microphone, and microphone front end and impedance tube in two mounting holes 6 respectively --- refraction 12 inner wall phase of pipe It is flat;Said structure is supported by base 2, forms sound wave oblique incidence material sound insulation measuring device;When voice tube 3 and reflection tube 7 it Between angle when being 30 °, 45 °, 60 °, 75 °, the first opening of equal tee pipe fitting, the second opening, the cross section of the 3rd opening It is equal diameter circle.
The measuring method of the sound wave oblique incidence material acoustic absorptivity measuring device of the present invention comprises the following steps:
1) signal generator makes loudspeaker into sound wave oblique incidence material acoustic absorptivity measuring device by power amplifier Send white Gaussian noise;
2) four-way data collecting card is connected by signal conditioner with microphone, gathers the sound at microphone position respectively Signal is pressed, and is passed in computer;
3) computer calculates the sound after four kinds of reduced three-way pipe fittings are put into test specimen respectively using acoustic absorptivity calculation formula Under the incident each angle of ripple the reflectance factor of material and acoustic absorptivity with frequency change curve.
The reflectance factor and the calculating process of acoustic absorptivity are as follows:
1) near-end microphone on voice tube, i.e., the microphone nearest apart from test specimen on voice tube, the acoustic pressure collected are p2, Distal end microphone on voice tube, i.e., the microphone farthest apart from test specimen on voice tube, the acoustic pressure collected are p1, by p2With p1Make Business, it is H to try to achieve incidence wave transmission function1
2) by near-end microphone on reflection tube, i.e., the microphone nearest from test specimen on reflection tube, the acoustic pressure collected is p3, With distal end microphone on reflection tube, i.e., the microphone farthest from test specimen on reflection tube, the acoustic pressure collected is p4, by p3With p4Make Business, it is H to try to achieve back wave transmission function2
3) voice tube and the incidence wave that the respective distal end microphone pick of reflection tube arrives and the summation of back wave acoustic pressure are P1, pass Sound pipe is P with the incidence wave that the respective near-end microphone pick of reflection tube arrives and the summation of back wave acoustic pressure2, by P2With P1Make business, ask The transmission function for obtaining total sound field in acoustic absorptivity measuring device is H12
4) transmission function of total sound field and incidence wave transmission function and back wave transmission in acoustic absorptivity measuring device are utilized Functional relation, can derive that reflectance factor r is calculated by following equation:Wherein H1For incidence wave transmission Function, H2For back wave transmission function, H12For the transmission function of total sound field in acoustic absorptivity measuring device, x1For voice tube and instead Test specimen and distal end microphone on pipe are penetrated, i.e., with a distance from microphone farthest from test specimen on voice tube and reflection tube;
Acoustic absorptivity α is calculated by following equation:α=1- | r |2
The measuring method of the sound wave oblique incidence material sound insulation measuring device of the present invention comprises the following steps:
1) signal generator makes loudspeaker be sent out into sound wave oblique incidence material sound insulation measuring device by power amplifier Go out white Gaussian noise;
2) six channel data capture cards are connected by signal conditioner with microphone, gather the sound at microphone position respectively Signal is pressed, and is passed in computer;
3) computer calculates the sound wave after four kinds of equal tee pipe fittings are put into test specimen respectively using oise insulation factor calculation formula Under incident each angle the transmission coefficient of material and oise insulation factor with frequency change curve.
The transmission coefficient and the calculating process of oise insulation factor are as follows:Transmission coefficient tpCalculated by following equation:
Oise insulation factor TL is calculated by following equation:TL=-20lgtp|
Wherein x1For test specimen on voice tube and reflection tube and distal end microphone, i.e., voice tube with it is farthest from test specimen on reflection tube Microphone distance, x2For test specimen on voice tube and reflection tube and near-end microphone, i.e., from test specimen on voice tube and reflection tube The distance of nearest microphone, x3Upper test specimen and the distance of near-end microphone, x are managed for refraction4Upper test specimen is managed for refraction to pass with distal end The distance of sound device, P1For away from test specimen x1The acoustic pressure of two microphone picks and P at position2For away from test specimen x2At position two it is transaudient The acoustic pressure of device collection and P3For away from test specimen x3The acoustic pressure of microphone pick, P at position4For away from test specimen x4Microphone pick at position Acoustic pressure,Sound pressure amplitude is answered for incidence wave,Transmitted wave answers sound pressure amplitude, and k is the complex wave number of sound wave, and s is voice tube, reflection Pipe and two microphone spacing in transmissive tube, tpFor transmission coefficient, TL is oise insulation factor.
The beneficial effects of the present invention are:Sound wave oblique incidence material acoustic absorptivity with sound insulation measuring device actually by Reducer tee is replaced with equal tee pipe fitting to change angle during sound wave incident material, which can measure sound wave incident Angle is change curve of the acoustic absorptivity of 30 °, 45 °, 60 °, 75 ° materials with oise insulation factor with frequency.It is transaudient using two during test Device spacing difference adjusts the frequency range of test, it is possible to achieve material acoustic absorptivity of the frequency from 100Hz to 1600Hz with every Volume measures.And sample needed for the device is small, equipment is simple, in common lab with regard to operable.Thus sound wave oblique incidence material Acoustic absorptivity just has that light, measuring method easy to operate is simple, economical convenient with sound insulation measuring device, measurable larger frequency band The excellent in performance such as change of material acoustic absorptivity and oise insulation factor during interior sound wave oblique incidence.These excellent in performance can be largely Improve science and technology now.Acoustic absorptivity, reflectance factor and impedance and admittance measurement etc. in sound wave oblique incidence material Show new advantage.
Brief description of the drawings
Attached drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair Bright illustrative example and its explanation is used to explain the present invention, does not form inappropriate limitation of the present invention.
Fig. 1 is the structure diagram of the sound wave oblique incidence material acoustic absorptivity measuring device of the present invention;
Fig. 2 is the structure diagram of the sound wave oblique incidence material sound insulation measuring device of the present invention;
Fig. 3 is the reduced three-way pipe fitting (angle of voice tube and reflection tube is 30 °, 60 °, 75 °) and test specimen cylinder of the present invention Structure diagram;
Fig. 4 is that the structure of the equal tee pipe fitting (angle of voice tube and reflection tube is 30 °, 60 °, 75 °) of the present invention is shown It is intended to;
Fig. 5 is the circuit module block diagram of the sound wave oblique incidence material acoustic absorptivity measuring device of the present invention;
Fig. 6 is the circuit module block diagram of the sound wave oblique incidence material sound insulation measuring device of the present invention.
In figure:1st, loudspeaker;2nd, base;3rd, voice tube;4th, tee pipe fitting;5th, test specimen;6th, mounting hole;7th, reflection tube;8、 Scud-absorbing treatment pipe A;9th, backboard;10th, test specimen cylinder;11st, piston rod;12nd, refraction pipe;13rd, scud-absorbing treatment pipe B.
Embodiment
The detailed content and its embodiment of the present invention is further illustrated below in conjunction with the accompanying drawings.
Referring to shown in Fig. 1 to Fig. 4, sound wave oblique incidence material acoustic absorptivity of the invention and sound insulation measuring device, raise one's voice Device 1 is connected with one end of voice tube 3, and the other end of the voice tube 3 is connected with the first opening of tee pipe fitting 4;Reflection tube 7 One end is provided with scud-absorbing treatment pipe A8, and the other end is connected with the second opening of tee pipe fitting 4;Filling in the scud-absorbing treatment pipe A8 Sound-absorbing material makes the noiseless wave reflection in 7 end of reflection tube;Three mounting holes 6, two of which mounting hole 6 are set on the voice tube 3 Interior installation microphone, and microphone front end and impedance tube --- 3 inner wall of voice tube is equal, another mounting hole 6 passes through made of metal The mandril temporary sealing of work is to prevent leak-stopping sound;Three mounting holes 6 are set on the reflection tube 7, are installed in two of which mounting hole 6 Microphone, and microphone front end and impedance tube --- 7 inner wall of reflection tube is equal, the top that another mounting hole 6 is made by metal Bar temporary sealing is to prevent leak-stopping sound.
Angle between the voice tube 3 and reflection tube 7 is 30 °~75 °.
The tee pipe fitting 4 is reduced three-way pipe fitting, and test specimen 5 is placed in the reduced three-way pipe fitting, the reducing 3rd opening of tee pipe fitting is connected with test specimen cylinder 10, and the cross section of test specimen cylinder is identical with reduced three-way pipe fitting, the test specimen cylinder 10 are provided centrally with piston rod 11 and go deep into reduced three-way pipe fitting, and the piston rod 11 stretched in reduced three-way pipe fitting One end is equipped with backboard 9, and a cavity is formed between backboard 9 and test specimen 5, and the size of the cavity is adjusted by piston rod 11, piston The bar other end is carved with calibration record sample to the distance of back plate surface;Said structure is supported by base 2, forms sound wave oblique incidence material Expect acoustic absorptivity measuring device.The frequency range of test is adjusted using two microphone spacing differences during test, realizes frequency Material acoustic absorptivity measurement from 100Hz to 1600Hz.
When the angle between voice tube 3 and reflection tube 7 is 30 °, 45 °, 60 °, 75 °, the first of reduced three-way pipe fitting opens Mouth, the cross section of the second opening are equal diameter circle, and the cross section of the 3rd opening is identical for short axle, the different ellipse of major axis.
The tee pipe fitting 4 is equal tee pipe fitting, and test specimen 5 is placed in the equal tee pipe fitting, described isometrical 3rd opening of tee pipe fitting is connected with reflecting one end of pipe 12, and the other end of the refraction pipe 12 is provided with scud-absorbing treatment pipe Filling sucting sound material makes the noiseless wave reflection in 12 end of refraction pipe in B13, scud-absorbing treatment pipe B13;Two are set on the refraction pipe 12 A mounting hole 6, installs microphone, and microphone front end and impedance tube in two mounting holes 6 respectively --- refraction 12 inner wall phase of pipe It is flat;Said structure is supported by base 2, forms sound wave oblique incidence material sound insulation measuring device.Two microphones are utilized during test Spacing difference adjusts the frequency range of test, realizes material sound insulation measurement of the frequency from 100Hz to 1600Hz.
When the angle between voice tube 3 and reflection tube 7 is 30 °, 45 °, 60 °, 75 °, the first of equal tee pipe fitting opens Mouth, the second opening, the cross section of the 3rd opening are equal diameter circle.
The measuring method of the sound wave oblique incidence material acoustic absorptivity measuring device comprises the following steps:
1) signal generator makes loudspeaker into sound wave oblique incidence material acoustic absorptivity measuring device by power amplifier Send white Gaussian noise;
2) four-way data collecting card is connected by signal conditioner with microphone, respectively four kinds of reducer tees of collection installation Sound pressure signal in the impedance tube of pipe fitting at microphone position, and be passed in computer;
3) computer calculates the sound after four kinds of reduced three-way pipe fittings are put into test specimen respectively using acoustic absorptivity calculation formula Under the incident each angle of ripple the reflectance factor of material and acoustic absorptivity with frequency change curve.
The reflectance factor and the calculating process of acoustic absorptivity are as follows:
1) near-end microphone on voice tube, i.e., the microphone nearest apart from test specimen on voice tube, the acoustic pressure collected are p2, Distal end microphone on voice tube, i.e., the microphone farthest apart from test specimen on voice tube, the acoustic pressure collected are p1, by p2With p1Make Business, it is H to try to achieve incidence wave transmission function1
2) by near-end microphone on reflection tube, i.e., the microphone nearest from test specimen on reflection tube, the acoustic pressure collected is p3, With distal end microphone on reflection tube, i.e., the microphone farthest from test specimen on reflection tube, the acoustic pressure collected is p4, by p3With p4Make Business, it is H to try to achieve back wave transmission function2
3) voice tube and the incidence wave that the respective distal end microphone pick of reflection tube arrives and the summation of back wave acoustic pressure are P1, pass Sound pipe is P with the incidence wave that the respective near-end microphone pick of reflection tube arrives and the summation of back wave acoustic pressure2, by P2With P1Make business, ask The transmission function for obtaining total sound field in acoustic absorptivity measuring device is H12
4) transmission function of total sound field and incidence wave transmission function and back wave transmission in acoustic absorptivity measuring device are utilized Functional relation, can derive that reflectance factor r is calculated by following equation:Wherein H1For incidence wave transmission Function, H2For back wave transmission function, H12For the transmission function of total sound field in acoustic absorptivity measuring device, x1For voice tube and instead Test specimen and distal end microphone on pipe are penetrated, i.e., with a distance from microphone farthest from test specimen on voice tube and reflection tube;
Acoustic absorptivity α is calculated by following equation:α=1- | r |2
The measuring method of the sound wave oblique incidence material sound insulation measuring device comprises the following steps:
1) signal generator makes loudspeaker be sent out into sound wave oblique incidence material sound insulation measuring device by power amplifier Go out white Gaussian noise;
2) six channel data capture cards are connected by signal conditioner with microphone, respectively four kinds of equal tees of collection installation Sound pressure signal in the impedance tube of pipe fitting at microphone position, and be passed in computer;
3) computer calculates the sound wave after four kinds of equal tee pipe fittings are put into test specimen respectively using oise insulation factor calculation formula Under incident each angle the transmission coefficient of material and oise insulation factor with frequency change curve.
The transmission coefficient and the calculating process of oise insulation factor are as follows:Transmission coefficient tpCalculated by following equation:
Oise insulation factor TL is calculated by following equation:TL=-20lg | tp|
Wherein x1For test specimen on voice tube and reflection tube and distal end microphone, i.e., voice tube with it is farthest from test specimen on reflection tube Microphone distance, x2For test specimen on voice tube and reflection tube and near-end microphone, i.e., from test specimen on voice tube and reflection tube The distance of nearest microphone, x3Upper test specimen and the distance of near-end microphone, x are managed for refraction4Upper test specimen is managed for refraction to pass with distal end The distance of sound device, P1For away from test specimen x1The acoustic pressure of two microphone picks and P at position2For away from test specimen x2At position two it is transaudient The acoustic pressure of device collection and P3For away from test specimen x3The acoustic pressure of microphone pick, P at position4For away from test specimen x4Microphone pick at position Acoustic pressure,Sound pressure amplitude is answered for incidence wave,Transmitted wave answers sound pressure amplitude, and k is the complex wave number of sound wave, and s is voice tube, reflection Pipe and two microphone spacing in transmissive tube, tpFor transmission coefficient, TL is oise insulation factor.
Embodiment:
The measuring method of sound wave oblique incidence material acoustic absorptivity measuring device of the present invention comprises the following steps:
1) preparation before, measuring:
Test specimen is put into reduced three-way pipe fitting center, according to sound wave principle of reflection, near-end microphone on test specimen to voice tube With a distance from (microphone nearest from test specimen on voice tube) with test specimen to near-end microphone on reflection tube (on reflection tube from test specimen most Near microphone) microphone distance it is identical, voice tube three microphone spacing respective with reflection tube are also identical, to avoid trying The distortion of part surficial acoustic field produces error, and test specimen is apart from near-end microphone (voice tube and microphone nearest from test specimen on reflection tube) Distance should be greater than twice of caliber, according to shown in Fig. 1, the impedance tube of sound wave oblique incidence material acoustic absorptivity measuring device is installed It is good, due to being influenced be subject to humidity, temperature or microphone internal structure, microphone before use using calibrator to microphone into Rower is determined;According to shown in Fig. 5, loudspeaker is connected by amplifier, signal generator with computer, four microphones are distinguished It is connected with signal conditioner, the signal conditioner is connected with data collecting card respectively, the data collecting card and computer phase Even;Opening signal generator produces plane wave, certain loudspeaker can also produce through amplifier drive the speaker sounding in impedance tube Raw higher-order wave, therefore the present invention is plane wave for ensure to propagate in pipe, loudspeaker surface to distal end microphone (on voice tube from The farthest microphone of test specimen) distance be more than three times caliber, speaker operation more than 10 minutes, its working performance tends towards stability When, indicate that preparation is completed;
2) sound wave oblique incidence material acoustic absorptivity, is measured:
2.1) sound pressure signal of each microphone corresponding position is gathered using the data collecting card of four-way;
2.2) acoustic pressure that near-end microphone (microphone nearest from test specimen on voice tube) collects on voice tube is p2, pass The acoustic pressure that distal end microphone (microphone farthest from test specimen on voice tube) collects on sound pipe is p1, by p2With p1Make business, try to achieve Incidence wave transmission function is H1
2.3) acoustic pressure for collecting near-end microphone on reflection tube (microphone nearest from test specimen on reflection tube) is p3, The acoustic pressure collected with distal end microphone on reflection tube (microphone farthest from test specimen on reflection tube) is p4, by p3With p4Make business, It is H to try to achieve back wave transmission function2
2.4) voice tube and the incidence wave that distal end microphone pick on reflection tube arrives and the summation of back wave acoustic pressure are P1, it is transaudient Pipe is P with the incidence wave that near-end microphone pick on reflection tube arrives and the summation of back wave acoustic pressure2, by P2With P1Make business, try to achieve sound absorption The transmission function of total sound field is H in coefficient measuring device12
2.5) transmission function of total sound field in acoustic absorptivity measuring device is utilized to be passed with incidence wave transmission function and back wave Delivery function relation, can derive that reflectance factor r is calculated by following equation:Wherein H1Passed for incidence wave Delivery function, H2For back wave transmission function, H12For the transmission function of total sound field in acoustic absorptivity measuring device, x1For voice tube with On reflection tube with a distance from test specimen and distal end microphone (voice tube and microphone farthest from test specimen on reflection tube);According to formula α =1- | r |2The acoustic absorptivity of material when can obtain sound wave oblique incidence;
2.6) reduced three-way pipe fitting in Fig. 3 and test specimen cylinder are replaced into oblique incidence material acoustic absorptivity measuring device, weight Multiple step 2, eventually pass through numerical computations can be visually seen the acoustic absorptivities of 30 °, 45 °, 60 °, the 75 ° materials in sound wave incident angle with The change curve of frequency.
The measuring method of sound wave oblique incidence material sound insulation measuring device of the present invention comprises the following steps:
1) preparation before, measuring:
Test specimen is put into reduced three-way pipe fitting center, according to sound wave principle of reflection, near-end microphone on test specimen to voice tube With a distance from (microphone nearest from test specimen on voice tube) with test specimen to near-end microphone on reflection tube (on reflection tube from test specimen most Near microphone) microphone distance it is identical, voice tube three microphone spacing respective with reflection tube are also identical, to avoid sample The distortion of product surficial acoustic field produces error, and test specimen is apart from near-end microphone (voice tube and microphone nearest from test specimen on reflection tube) Distance should be greater than twice of caliber, test specimen should be greatly with a distance from near-end microphone (the upper microphone nearest from test specimen of refraction pipe) In three times caliber, according to shown in Fig. 1, the impedance tube of sound wave oblique incidence material acoustic absorptivity measuring device is installed, due to by To the influence of humidity, temperature or microphone internal structure, microphone before use demarcates microphone using calibrator;Press According to shown in Fig. 5, loudspeaker is connected by amplifier, signal generator with computer, by four microphones respectively with signal tune Reason device is connected, and the signal conditioner is connected with data collecting card respectively, and the data collecting card is connected with computer;Open letter Number generator produces plane wave through amplifier drive the speaker sounding in impedance tube, and certain loudspeaker can also produce higher-order wave, Therefore the present invention is plane wave for ensure to propagate in pipe, and loudspeaker surface to distal end microphone is (farthest from test specimen on voice tube Microphone) distance be more than three times caliber, speaker operation more than 10 minutes, when its working performance tends towards stability, indicates Preparation is completed.
2) sound wave oblique incidence material oise insulation factor, is measured:
2.1) sound pressure signal of each microphone corresponding position in the data collecting card collection impedance tube of six passages is utilized;
2.2) formula is utilized
The transmission coefficient of material, wherein x when can obtain sound wave oblique incidence1For test specimen on voice tube and reflection tube and distal end On microphone, i.e. voice tube and reflection tube with a distance from the microphone farthest from test specimen, x2For test specimen on voice tube and reflection tube with On near-end microphone, i.e. voice tube and reflection tube with a distance from the microphone nearest from test specimen, x3Upper test specimen and near-end are managed for refraction The distance of microphone, x4Upper test specimen and the distance of distal end microphone, P are managed for refraction1For away from test specimen x1Two microphones are adopted at position The acoustic pressure of collection and P2For away from test specimen x2The acoustic pressure of two microphone picks and P at position3For away from test specimen x3Microphone is adopted at position The acoustic pressure of collection, P4For away from test specimen x4The acoustic pressure of microphone pick at position,Sound pressure amplitude is answered for incidence wave,Transmitted wave answers sound Pressure amplitude value, k are the complex wave number of sound wave, and s is two microphone spacing in voice tube, reflection tube and transmissive tube, tpFor transmission coefficient, TL For oise insulation factor.
2.3) isometrical tee pipe fitting in Fig. 4 is replaced in insulating against sound measuring device to oblique incidence material, repeat step 2, most The oise insulation factor that 30 °, 45 °, 60 °, the 75 ° materials in sound wave incident angle can be can be visually seen by numerical computations eventually is bent with the change of frequency Line.
The foregoing is merely the preferred embodiment of the present invention, it is not intended to limit the invention, for the technology of this area For personnel, the invention may be variously modified and varied.All any modification, equivalent substitution, improvement and etc. made for the present invention, It should all be included in the protection scope of the present invention.

Claims (8)

1. a kind of sound wave oblique incidence material acoustic absorptivity and sound insulation measuring device, it is characterised in that:Loudspeaker (1) and voice tube (3) one end is connected, and the other end of the voice tube (3) is connected with the first opening of tee pipe fitting (4);The one of reflection tube (7) End is provided with scud-absorbing treatment pipe A (8), and the other end is connected with the second opening of tee pipe fitting (4);In the scud-absorbing treatment pipe A (8) Filling sucting sound material makes the noiseless wave reflection in reflection tube (7) end;Three mounting holes (6) are set on the voice tube (3), wherein two Installation microphone in a mounting hole (6), and microphone front end and impedance tube --- voice tube (3) inner wall is equal, another installation The mandril temporary sealing that hole (6) is made by metal is to prevent leak-stopping sound;Three mounting holes (6) are set on the reflection tube (7), its In installation microphone in two mounting holes (6), and microphone front end and impedance tube --- reflection tube (7) inner wall is equal, another The mandril temporary sealing that mounting hole (6) is made by metal is to prevent leak-stopping sound.
2. sound wave oblique incidence material acoustic absorptivity according to claim 1 and sound insulation measuring device, it is characterised in that:Institute Angle between the voice tube (3) and reflection tube (7) stated is 30 °~75 °.
3. sound wave oblique incidence material acoustic absorptivity according to claim 1 and sound insulation measuring device, it is characterised in that:Institute The tee pipe fitting (4) stated is reduced three-way pipe fitting, and test specimen (5) is placed in the reduced three-way pipe fitting, the reduced tee 3rd opening of part is connected with test specimen cylinder (10), and the test specimen cylinder (10) is provided centrally with piston rod (11) and gos deep into reducing three In way pipe fitting, the piston rod (11) stretches to one end in reduced three-way pipe fitting and is equipped with backboard (9), backboard (9) and test specimen (5) Between form a cavity, the size of the cavity passes through piston rod (11) and adjusts;Said structure is supported by base (2), composition sound Ripple oblique incidence material acoustic absorptivity measuring device;When the angle between voice tube (3) and reflection tube (7) is 30 °, 45 °, 60 °, At 75 °, the first opening of reduced three-way pipe fitting, the cross section of the second opening are equal diameter circle, and the cross section of the 3rd opening is Short axle is identical, the different ellipse of major axis.
4. sound wave oblique incidence material acoustic absorptivity according to claim 1 and sound insulation measuring device, it is characterised in that:Institute The tee pipe fitting (4) stated is equal tee pipe fitting, and test specimen (5) is placed in the equal tee pipe fitting, the straight tee 3rd opening of part is connected with one end of refraction pipe (12), and the other end of the refraction pipe (12) is provided with scud-absorbing treatment pipe B (13), scud-absorbing treatment pipe B (13) interior filling sucting sound material makes the noiseless wave reflection in refraction pipe (12) end;On the refraction pipe (12) Two mounting holes (6) are set, microphone, and microphone front end and impedance tube are installed respectively in two mounting holes (6) --- refraction It is equal to manage (12) inner wall;Said structure is supported by base (2), forms sound wave oblique incidence material sound insulation measuring device;When transaudient When the angle managed between (3) and reflection tube (7) is 30 °, 45 °, 60 °, 75 °, the first opening of equal tee pipe fitting, second open Mouth, the cross section of the 3rd opening are equal diameter circle.
5. sound wave oblique incidence material acoustic absorptivity according to claim 3 and sound insulation measuring device, it is characterised in that:Institute The measuring method for the sound wave oblique incidence material acoustic absorptivity measuring device stated comprises the following steps:
1) signal generator makes loudspeaker be sent into sound wave oblique incidence material acoustic absorptivity measuring device by power amplifier White Gaussian noise;
2) four-way data collecting card is connected by signal conditioner with microphone, gathers the acoustic pressure letter at microphone position respectively Number, and be passed in computer;
3) computer using acoustic absorptivity calculation formula calculates four kinds of reduced three-way pipe fittings and is put into the sound wave after test specimen respectively enters The reflectance factor of material and acoustic absorptivity are penetrated under each angle with the change curve of frequency.
6. sound wave oblique incidence material acoustic absorptivity according to claim 5 and sound insulation measuring device, it is characterised in that:Institute The reflectance factor and the calculating process of acoustic absorptivity stated are as follows:
1) near-end microphone on voice tube, i.e., the microphone nearest apart from test specimen on voice tube, the acoustic pressure collected are p2, it is transaudient Distal end microphone on pipe, i.e., the microphone farthest apart from test specimen on voice tube, the acoustic pressure collected are p1, by p2With p1Make business, ask It is H to obtain incidence wave transmission function1
2) by near-end microphone on reflection tube, i.e., the microphone nearest from test specimen on reflection tube, the acoustic pressure collected is p3, it is and anti- Distal end microphone on pipe is penetrated, i.e., the microphone farthest from test specimen on reflection tube, the acoustic pressure collected is p4, by p3With p4Make business, ask It is H to obtain back wave transmission function2
3) voice tube and the incidence wave that the respective distal end microphone pick of reflection tube arrives and the summation of back wave acoustic pressure are P1, voice tube The incidence wave arrived with the respective near-end microphone pick of reflection tube is P with the summation of back wave acoustic pressure2, by P2With P1Make business, try to achieve suction The transmission function of total sound field is H in sound coefficient measuring device12
4) transmission function and incidence wave transmission function and back wave transmission function of total sound field in acoustic absorptivity measuring device are utilized Relation, can derive that reflectance factor r is calculated by following equation:Wherein H1For incidence wave transmission function, H2For back wave transmission function, H12For the transmission function of total sound field in acoustic absorptivity measuring device, x1For voice tube and reflection tube Upper test specimen and distal end microphone, i.e., with a distance from microphone farthest from test specimen on voice tube and reflection tube;
Acoustic absorptivity α is calculated by following equation:α=1- | r |2
7. sound wave oblique incidence material acoustic absorptivity according to claim 4 and sound insulation measuring device, it is characterised in that:Institute The measuring method for the sound wave oblique incidence material sound insulation measuring device stated comprises the following steps:
1) signal generator makes loudspeaker send height into sound wave oblique incidence material sound insulation measuring device by power amplifier This white noise;
2) six channel data capture cards are connected by signal conditioner with microphone, gather the acoustic pressure letter at microphone position respectively Number, and be passed in computer;
3) computer calculates the sound wave incident after four kinds of equal tee pipe fittings are put into test specimen respectively using oise insulation factor calculation formula Under each angle the transmission coefficient of material and oise insulation factor with frequency change curve.
8. sound wave oblique incidence material acoustic absorptivity according to claim 7 and sound insulation measuring device, it is characterised in that:Institute The transmission coefficient and the calculating process of oise insulation factor stated are as follows:Transmission coefficient tpCalculated by following equation:
<mrow> <msub> <mi>t</mi> <mi>p</mi> </msub> <mo>=</mo> <mfrac> <msub> <mover> <mi>P</mi> <mo>^</mo> </mover> <mn>3</mn> </msub> <msub> <mover> <mi>P</mi> <mo>^</mo> </mover> <mn>1</mn> </msub> </mfrac> <mo>=</mo> <mfrac> <mrow> <mn>2</mn> <mi>j</mi> <mi> </mi> <mi>s</mi> <mi>i</mi> <mi>n</mi> <mrow> <mo>(</mo> <mi>k</mi> <mi>s</mi> <mo>)</mo> </mrow> <mrow> <mo>(</mo> <msub> <mi>P</mi> <mn>3</mn> </msub> <msub> <mi>P</mi> <mn>1</mn> </msub> <mo>-</mo> <msub> <mi>P</mi> <mn>4</mn> </msub> <msub> <mi>P</mi> <mn>2</mn> </msub> <mo>)</mo> </mrow> <msup> <mi>e</mi> <mrow> <mi>j</mi> <mi>k</mi> <mrow> <mo>(</mo> <msub> <mi>x</mi> <mn>2</mn> </msub> <mo>+</mo> <msub> <mi>x</mi> <mn>3</mn> </msub> <mo>)</mo> </mrow> </mrow> </msup> </mrow> <mrow> <mo>(</mo> <msubsup> <mi>P</mi> <mn>1</mn> <mn>2</mn> </msubsup> <mo>-</mo> <msubsup> <mi>P</mi> <mn>4</mn> <mn>2</mn> </msubsup> <mo>)</mo> <msup> <mi>e</mi> <mrow> <mn>2</mn> <mi>j</mi> <mi>k</mi> <mi>s</mi> </mrow> </msup> <mo>+</mo> <mn>2</mn> <mo>(</mo> <msub> <mi>P</mi> <mn>4</mn> </msub> <msub> <mi>P</mi> <mn>3</mn> </msub> <mo>-</mo> <msub> <mi>P</mi> <mn>1</mn> </msub> <msub> <mi>P</mi> <mn>2</mn> </msub> <mo>)</mo> <msup> <mi>e</mi> <mrow> <mi>j</mi> <mi>k</mi> <mi>s</mi> </mrow> </msup> <mo>+</mo> <msubsup> <mi>P</mi> <mn>2</mn> <mn>2</mn> </msubsup> <mo>-</mo> <msubsup> <mi>P</mi> <mn>3</mn> <mn>2</mn> </msubsup> </mrow> </mfrac> </mrow>
Oise insulation factor TL is calculated by following equation:TL=-20lg | t |p
Wherein x1For test specimen on voice tube and reflection tube and distal end microphone, i.e. voice tube and biography farthest from test specimen on reflection tube The distance of sound device, x2For test specimen on voice tube and reflection tube and near-end microphone, i.e., voice tube with it is nearest from test specimen on reflection tube Microphone distance, x3Upper test specimen and the distance of near-end microphone, x are managed for refraction4Upper test specimen and distal end microphone are managed for refraction Distance, P1For away from test specimen x1The acoustic pressure of two microphone picks and P at position2For away from test specimen x2Two microphones are adopted at position The acoustic pressure of collection and P3For away from test specimen x3The acoustic pressure of microphone pick, P at position4For away from test specimen x4The sound of microphone pick at position Pressure,Sound pressure amplitude is answered for incidence wave,Transmitted wave answers sound pressure amplitude, and k is the complex wave number of sound wave, s is voice tube, reflection tube with Two microphone spacing, t in transmissive tubepFor transmission coefficient, TL is oise insulation factor.
CN201711455921.7A 2017-12-28 2017-12-28 Sound absorption coefficient and sound insulation amount measuring device and measuring method for sound wave oblique incidence material Active CN107907595B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711455921.7A CN107907595B (en) 2017-12-28 2017-12-28 Sound absorption coefficient and sound insulation amount measuring device and measuring method for sound wave oblique incidence material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711455921.7A CN107907595B (en) 2017-12-28 2017-12-28 Sound absorption coefficient and sound insulation amount measuring device and measuring method for sound wave oblique incidence material

Publications (2)

Publication Number Publication Date
CN107907595A true CN107907595A (en) 2018-04-13
CN107907595B CN107907595B (en) 2023-06-06

Family

ID=61871834

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711455921.7A Active CN107907595B (en) 2017-12-28 2017-12-28 Sound absorption coefficient and sound insulation amount measuring device and measuring method for sound wave oblique incidence material

Country Status (1)

Country Link
CN (1) CN107907595B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109870507A (en) * 2019-01-25 2019-06-11 河海大学 A kind of porous asphalt mixture noise absorbent and communication effect test device and usage
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
CN111562316A (en) * 2019-12-20 2020-08-21 襄阳达安汽车检测中心有限公司 Material sound absorption coefficient measuring method based on double-sided array and generalized inverse algorithm
CN112730626A (en) * 2021-01-05 2021-04-30 中国科学院声学研究所 On-site sound insulation measuring device and method based on vector sensor
CN113740438A (en) * 2020-05-27 2021-12-03 比亚迪股份有限公司 Acoustic coefficient testing device and method
CN114414664A (en) * 2022-01-08 2022-04-29 西北工业大学 Sound absorption coefficient testing device and method based on embedded control system and short sound tube
CN114486134A (en) * 2021-12-17 2022-05-13 中国航发湖南动力机械研究所 Vibration fatigue test radiation noise monitoring device
CN114894905A (en) * 2022-07-15 2022-08-12 镇江贝斯特新材料股份有限公司 Method, system, storage medium and device for testing acoustic performance of material

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101216461A (en) * 2008-01-08 2008-07-09 西安交通大学 Acoustic absorbent high-temperature sound absorption performance test apparatus
CN101458231A (en) * 2009-01-07 2009-06-17 清华大学 Sound absorption coefficient field measurement apparatus and method
JP2012052987A (en) * 2010-09-03 2012-03-15 Takenaka Komuten Co Ltd Sound adsorption coefficient measuring device, sound characteristics measuring device, method and program
CN202595645U (en) * 2012-06-01 2012-12-12 上海船舶运输科学研究所 Sound barrier suitable for rail transit
CN202693525U (en) * 2012-06-14 2013-01-23 浙江吉利汽车研究院有限公司杭州分公司 Sound absorption coefficient measuring system by standing wave tube method
CN103439126A (en) * 2013-07-11 2013-12-11 哈尔滨工程大学 Experimental measurement method for medium-high frequency acoustic performance of large-pipe-diameter silencer
CN104535647A (en) * 2014-11-26 2015-04-22 华晨汽车集团控股有限公司 Prediction apparatus for sound absorption and insulation performance of multilayer material and method
JP5973102B1 (en) * 2016-03-10 2016-08-23 三菱日立パワーシステムズ株式会社 Propagation constant acquisition method, sound absorption coefficient calculation method, sound absorption coefficient evaluation device
CN207636541U (en) * 2017-12-28 2018-07-20 吉林大学 Sound wave oblique incidence material acoustic absorptivity and sound insulation measuring device

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101216461A (en) * 2008-01-08 2008-07-09 西安交通大学 Acoustic absorbent high-temperature sound absorption performance test apparatus
CN101458231A (en) * 2009-01-07 2009-06-17 清华大学 Sound absorption coefficient field measurement apparatus and method
JP2012052987A (en) * 2010-09-03 2012-03-15 Takenaka Komuten Co Ltd Sound adsorption coefficient measuring device, sound characteristics measuring device, method and program
CN202595645U (en) * 2012-06-01 2012-12-12 上海船舶运输科学研究所 Sound barrier suitable for rail transit
CN202693525U (en) * 2012-06-14 2013-01-23 浙江吉利汽车研究院有限公司杭州分公司 Sound absorption coefficient measuring system by standing wave tube method
CN103439126A (en) * 2013-07-11 2013-12-11 哈尔滨工程大学 Experimental measurement method for medium-high frequency acoustic performance of large-pipe-diameter silencer
CN104535647A (en) * 2014-11-26 2015-04-22 华晨汽车集团控股有限公司 Prediction apparatus for sound absorption and insulation performance of multilayer material and method
JP5973102B1 (en) * 2016-03-10 2016-08-23 三菱日立パワーシステムズ株式会社 Propagation constant acquisition method, sound absorption coefficient calculation method, sound absorption coefficient evaluation device
CN207636541U (en) * 2017-12-28 2018-07-20 吉林大学 Sound wave oblique incidence material acoustic absorptivity and sound insulation measuring device

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109870507A (en) * 2019-01-25 2019-06-11 河海大学 A kind of porous asphalt mixture noise absorbent and communication effect test device and usage
CN109870507B (en) * 2019-01-25 2021-09-07 河海大学 Porous asphalt mixture noise absorption and propagation effect testing device and application method
CN111562316A (en) * 2019-12-20 2020-08-21 襄阳达安汽车检测中心有限公司 Material sound absorption coefficient measuring method based on double-sided array and generalized inverse algorithm
CN111562316B (en) * 2019-12-20 2021-03-23 襄阳达安汽车检测中心有限公司 Material sound absorption coefficient measuring method based on double-sided array and generalized inverse algorithm
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
CN113740438A (en) * 2020-05-27 2021-12-03 比亚迪股份有限公司 Acoustic coefficient testing device and method
CN113740438B (en) * 2020-05-27 2022-08-09 比亚迪股份有限公司 Acoustic coefficient testing device and method
CN112730626A (en) * 2021-01-05 2021-04-30 中国科学院声学研究所 On-site sound insulation measuring device and method based on vector sensor
CN114486134A (en) * 2021-12-17 2022-05-13 中国航发湖南动力机械研究所 Vibration fatigue test radiation noise monitoring device
CN114414664A (en) * 2022-01-08 2022-04-29 西北工业大学 Sound absorption coefficient testing device and method based on embedded control system and short sound tube
CN114894905A (en) * 2022-07-15 2022-08-12 镇江贝斯特新材料股份有限公司 Method, system, storage medium and device for testing acoustic performance of material
CN114894905B (en) * 2022-07-15 2022-09-20 镇江贝斯特新材料股份有限公司 Method, system, storage medium and device for testing acoustic performance of material

Also Published As

Publication number Publication date
CN107907595B (en) 2023-06-06

Similar Documents

Publication Publication Date Title
CN107907595A (en) Sound wave oblique incidence material acoustic absorptivity and sound insulation measuring device and its measuring method
CN103698403B (en) The measuring method of a kind of material and component oise insulation factor and measurement mechanism thereof
CN108461021A (en) A kind of multi-functional underwater sound parametric synthesis experimental apparatus for testing
CN107762823A (en) A kind of pump apparatus noise source characteristic test apparatus and measuring method
CN110231408A (en) A kind of method and device measuring material acoustics constant
CN104535647A (en) Prediction apparatus for sound absorption and insulation performance of multilayer material and method
CN109307711B (en) Train through passage sound insulation performance test method based on reverberation chamber and anechoic chamber
CN102735595A (en) Method for measuring particle size distribution of discrete state particles based on continuous wave and burst wave
CN109302667A (en) A kind of underwater sound transmitting transducer broadband sends the method for fast measuring and device of response
CN113203577A (en) Vehicle door sound insulation detection structure and method for detecting vehicle door sound insulation contribution amount
CN108955870A (en) A kind of air conditioner noises test method
Tijs et al. An intensity method for measuring absorption properties in situ
CN201716162U (en) Acoustics sealing detector of vehicle
CN104358602A (en) Noise control method of wideband composite sound absorption structure-based steam turbine generator unit
CN105467013A (en) Sound insulating material transmission loss predicting system and method based on mass law
CN108036200A (en) Monophone emission sensor leak position method based on gravity frequency attenuation characteristic
CN102426035B (en) Method for testing static flow resistivity and tortuosity of porous sound-absorbing material
CN107785025A (en) Noise remove method and device based on room impulse response duplicate measurements
CN202661357U (en) Device for measuring particle size distribution of particles in discrete state
CN105068120B (en) The sound wave experiment method in tight sand crack and recognition methods
CN207636541U (en) Sound wave oblique incidence material acoustic absorptivity and sound insulation measuring device
Suhanek et al. A comparison of two methods for measuring the sound absorption coefficient using impedance tubes
CN101521008B (en) Active sound-absorption taper and manufacture method thereof
CN113048404B (en) Urban gas pipeline tiny leakage diagnosis method
CN112730626B (en) On-site sound insulation measuring device and method based on vector sensor

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant