CN102426191A - Test method for measuring sound absorption coefficient of sound absorption or sound insulation material by use of reverberation chamber - Google Patents
Test method for measuring sound absorption coefficient of sound absorption or sound insulation material by use of reverberation chamber Download PDFInfo
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- CN102426191A CN102426191A CN2011102685531A CN201110268553A CN102426191A CN 102426191 A CN102426191 A CN 102426191A CN 2011102685531 A CN2011102685531 A CN 2011102685531A CN 201110268553 A CN201110268553 A CN 201110268553A CN 102426191 A CN102426191 A CN 102426191A
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Abstract
The invention relates to a test method for measuring the sound absorption coefficient of a sound absorption or sound insulation material by the use of a reverberation chamber and belongs to the technical field of noise control. All equipment is firstly placed in the reverberation chamber. Four microphones are installed inside the reverberation chamber and are respectively connected with four channels of a four-channel test system, which is connected with a power amplifier. The power amplifier is connected with a computer. Then, a signal-generator, the power amplifier and the computer which are positioned on the four-channel test system are turned on so as to enter a software test interface of the computer and calibrate each microphone. Finally, vacant auditoria and reverberation time after the material to be measured is put into the reverberation chamber are measured and recorded, and the sound absorption coefficient of the material to be measured can be obtained after software processing. The test method is simple and easy to operate. By the adoption of the test method, the measurement result consists with the sound absorption effect of the material in practical construction projects, the cost for making test samples is greatly saved, and simultaneously the test efficiency is raised.
Description
Technical field
The present invention is applicable to that with the method for testing of reverberation case measurement sound absorption or sound-proof material acoustical absorption coefficient area is 0.49-1.5m
2Any flat sheet membrane material or the measurement of sound absorber acoustical absorption coefficient, belong to the noise control technique field.
Background technology
At present, the acoustic absorptivity measurements of material mainly contain two kinds of methods, i.e. standing-wave-tube method and reverberation time method.Receive the restriction of measuring principle, material acoustical absorption coefficient and the acoustical absorption coefficient of material in actual engineering that standing-wave-tube method measures are different, and material acoustical absorption coefficient that the reverberation time method measures and the acoustical absorption coefficient of material in actual engineering are approximate.But, use Reverberation room method to measure the material acoustical absorption coefficient and generally require the area of measured material to be 10m at present
2, the limitation that special area requirements causes this experimental technique to use.
Sound absorption according to the invention or sound-proof material are meant the NVH material.As everyone knows, NVH is meant Noise (noise), Vibration (vibration) and Harshness (sound vibration roughness), and wherein sound vibration roughness is meant the quality of noise and vibration.Because what sound vibration roughness was described is that vibration and noise make the uncomfortable sensation of people, therefore has the people to claim that Harshness is uneven compliance.The reason that NVH produces is identical, and can interact, and is very necessary so it is studied and tests.
Summary of the invention
The objective of the invention is to overcome above-mentioned weak point, the principle of utilizing reverberation method to measure use special reverberation case to absorb sound or the acoustic absorptivity measurements of sound-proof material, but this method survey area is 0.49-1.5m
2Any flat sheet membrane material or the acoustical absorption coefficient of sound absorber.
Technical scheme of the present invention: with the method for testing of reverberation case measurement sound absorption or sound-proof material acoustical absorption coefficient, step is:
(1) connection device: equipment all places reverberation chamber, and four microphones are installed in the reverberation case, and microphone links to each other with four passages of four-way test macro respectively, and the four-way test macro links to each other with power amplifier, and power amplifier links to each other with computer again;
(2) test is prepared: open the signal generator, power amplifier and the computer that are positioned on the four-way test macro, get into software test interface in the computer, calibrate each microphone;
(3) test: the temperature and humidity at the software measurement interface during input measurement and the volume of reverberation chamber, the reverberation time of measuring barnyard, record; Detected materials is put into reverberation chamber, and the temperature and humidity at the software measurement interface during input measurement and the volume and the detected materials area of reverberation chamber are measured the reverberation time that detected materials is put into reverberation chamber, record; With the acoustical absorption coefficient that can obtain detected materials after the VA-Lab4 of the popularity company software processes.
What adopt being connected of said four-way test macro and microphone is the BNC connector.
Said reverberation case is a R-Cabin reverberation case, and volume is 9m
3, reverberation case cutoff frequency is 400Hz, the survey frequency scope is 400-10000Hz.
Four microphones install with the reverberation case in the time ground height more than or equal to 1m, apart from reverberation case tank wall distance more than or equal to 50cm.
Said detected materials is area 0.49-1.5m
2Flat sheet membrane material or sound absorber.
During measurement, produce the edge diffraction effect, need to block with angle steel at the detected materials edge for preventing detected materials; For keeping sound field consistent, also need to add angle steel and measure when measuring barnyard in reverberation case same position.
Measuring principle is the reverberation time mensuration; It is sound source sounding in (R-Cabin reverberation case) in enclosure space; Reverberant sound increases to a certain sound level, and reverberant sound decayed thereupon gradually after this sound source stopped sounding, and this decay is determined by the sound absorption characteristics of the interface in the enclosure space, air and test specimen.Reverberation time when not placing the reverberation time of material and placing material through measurement can obtain the acoustical absorption coefficient of material.
Beneficial effect of the present invention: this measuring method is easy, easy to operate.Under the prerequisite that does not increase measuring error, both guaranteed that measurement result and the detected materials acoustically effective in actual engineering was consistent, significantly reduced the test area of detected materials simultaneously, practice thrift the cost of manufacture of detected materials, and can improve testing efficiency.
Embodiment
Embodiment 1
The reverberation case is a R-Cabin reverberation case, and volume is 9m
3, reverberation case cutoff frequency is 400Hz, the survey frequency scope is 400-10000Hz.Test sample is certain carpet for automobile.
(1) connection device: equipment all places reverberation chamber; Four microphones are installed in the reverberation case; Microphone links to each other with four passages of four-way test macro respectively, four microphones install with the reverberation case in the time ground height more than or equal to 1m, apart from reverberation case tank wall distance more than or equal to 50cm.The four-way test macro links to each other with power amplifier, and power amplifier links to each other with computer again.What adopt being connected of four-way test macro and microphone is the BNC connector.
(2) test is prepared: open the signal generator, power amplifier and the computer that are positioned on the four-way test macro, get into software test interface in the computer, calibrate each microphone;
(3) test: the temperature and humidity at the software measurement interface during input measurement and the volume of reverberation chamber, the reverberation time of measuring barnyard, record; Getting area is 0.49m
2Flat sheet membrane material (certain carpet for automobile), detected materials is put into reverberation chamber, the temperature and humidity at the software measurement interface during input measurement and the volume and the detected materials area of reverberation chamber are measured the reverberation time that detected materials is put into reverberation chamber, record; With the acoustical absorption coefficient that can obtain detected materials after the VA-Lab4 of the popularity company software processes, the result is as shown in table 1.
Certain carpet for automobile acoustical absorption coefficient of table 1.
| Frequency (Hz) | 400 | 500 | 630 | 800 | 1000 | 1250 | 1600 | 2000 | 2500 | 3150 | 4000 | 5000 | 6300 | 8000 | 10000 |
| Acoustical absorption coefficient | 0.08 | 0.11 | 0.17 | 0.19 | 0.28 | 0.29 | 0.42 | 0.47 | 0.57 | 0.59 | 0.74 | 0.85 | 0.87 | 0.83 | 0.76 |
Embodiment 2
The reverberation case is a R-Cabin reverberation case, and volume is 9m
3, reverberation case cutoff frequency is 400Hz, and the survey frequency scope is 400-10000Hz, and test sample is certain automobile-used cabin sound insulating pad.
(1) connection device: equipment all places reverberation chamber; Four microphones are installed in the reverberation case; Microphone links to each other with four passages of four-way test macro respectively, four microphones install with the reverberation case in the time ground height more than or equal to 1m, apart from reverberation case tank wall distance more than or equal to 50cm.The four-way test macro links to each other with power amplifier, and power amplifier links to each other with computer again.What adopt being connected of four-way test macro and microphone is the BNC connector.
(2) test is prepared: open the signal generator, power amplifier and the computer that are positioned on the four-way test macro, get into software test interface in the computer, calibrate each microphone;
(3) test: the temperature and humidity at the software measurement interface during input measurement and the volume of reverberation chamber, the reverberation time of measuring barnyard, record; Getting area is 0.85m
2Flat sheet membrane material (certain automobile-used cabin sound insulating pad), detected materials is put into reverberation chamber, the temperature and humidity at the software measurement interface during input measurement and the volume and the detected materials area of reverberation chamber are measured the reverberation time that detected materials is put into reverberation chamber, record; With the acoustical absorption coefficient that can obtain detected materials after the VA-Lab4 of the popularity company software processes, the result is as shown in table 2.
Certain automobile-used cabin sound insulating pad acoustical absorption coefficient of table 2.
Embodiment 3
The reverberation case is a R-Cabin reverberation case, and volume is 9m
3, reverberation case cutoff frequency is 400Hz, and the survey frequency scope is 400-10000Hz, and test sample is certain automobile-used bonnet sound insulating pad.
(1) connection device: equipment all places reverberation chamber; Four microphones are installed in the reverberation case; Microphone links to each other with four passages of four-way test macro respectively, four microphones install with the reverberation case in the time ground height more than or equal to 1m, apart from reverberation case tank wall distance more than or equal to 50cm.The four-way test macro links to each other with power amplifier, and power amplifier links to each other with computer again.What adopt being connected of four-way test macro and microphone is the BNC connector.
(2) test is prepared: open the signal generator, power amplifier and the computer that are positioned on the four-way test macro, get into software test interface in the computer, calibrate each microphone;
(3) test: the temperature and humidity at the software measurement interface during input measurement and the volume of reverberation chamber, the reverberation time of measuring barnyard, record; Getting area is 1.5m
2Flat sheet membrane material (certain automobile-used bonnet sound insulating pad); Detected materials is put into reverberation chamber; The temperature and humidity at the software measurement interface during input measurement and the volume and the detected materials area of reverberation chamber are measured the reverberation time that detected materials is put into reverberation chamber, record; With the acoustical absorption coefficient that can obtain detected materials after the VA-Lab4 of the popularity company software processes, the result is as shown in table 3.
Certain automobile-used bonnet sound insulating pad acoustical absorption coefficient of table 3
| Frequency (Hz) | 400 | 500 | 630 | 800 | 1000 | 1250 | 1600 | 2000 | 2500 | 3150 | 4000 | 5000 | 6300 | 8000 | 10000 |
| Acoustical absorption coefficient | 0.25 | 0.47 | 0.65 | 0.75 | 0.94 | 0.93 | 1.03 | 0.95 | 0.99 | 0.91 | 0.93 | 0.96 | 0.97 | 1.02 | 1.14 |
Said starting material are all available from market, and said equipment is existing equipment, and wherein the four-way test macro is purchased in Beijing Sheng Wang Acoustic-Electric (BSWA) Technology Co., Ltd..
Claims (5)
1. measure the method for testing of sound absorption or sound-proof material acoustical absorption coefficient with the reverberation case, it is characterized in that step is:
(1) connection device: equipment comprises four microphones, four-way test macro, power amplifier and computer, all places reverberation chamber; Four microphones are installed in the reverberation case, and microphone links to each other with four passages of four-way test macro respectively, and the four-way test macro links to each other with power amplifier, and power amplifier links to each other with computer again;
(2) test is prepared: open the signal generator, power amplifier and the computer that are positioned on the four-way test macro, get into software test interface in the computer, calibrate each microphone;
(3) test: the temperature and humidity at the software measurement interface during input measurement and the volume of reverberation chamber, the reverberation time of measuring barnyard, record; Detected materials is put into reverberation chamber, and the temperature and humidity at the software measurement interface during input measurement and the volume and the detected materials area of reverberation chamber are measured the reverberation time that detected materials is put into reverberation chamber, record; Can obtain the acoustical absorption coefficient of detected materials after the software processes.
2. measure the method for testing of material acoustical absorption coefficient according to claim 1 is said with the reverberation case, it is characterized in that said four-way test macro and microphone what be connected employing is the BNC connector.
3. according to the said method of testing with reverberation case measurement material acoustical absorption coefficient of claim 1, it is characterized in that said reverberation case is a R-Cabin reverberation case, volume is 9m
3, reverberation case cutoff frequency is 400Hz, the survey frequency scope is 400-10000Hz.
4. measure the method for testing of material acoustical absorption coefficient according to claim 1 is said with the reverberation case, it is characterized in that four microphones install with the reverberation case in the time ground height more than or equal to 1m, apart from reverberation case tank wall distance more than or equal to 50cm.
5. according to the said method of testing of claim 1, it is characterized in that said detected materials is area 0.49-1.5m with reverberation case measurement material acoustical absorption coefficient
2Flat sheet membrane material or sound absorber.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105433A (en) * | 2013-01-15 | 2013-05-15 | 西北工业大学 | Device for measuring sound absorption coefficient of acoustic material by use of pulse method and measuring method |
| CN103364491A (en) * | 2013-07-02 | 2013-10-23 | 无锡吉兴汽车声学部件科技有限公司 | Fixture used for improving device for fixing bottom surface of acoustic component R-Cabin reverberation box of automobile |
| CN103675104A (en) * | 2013-11-26 | 2014-03-26 | 同济大学 | Method and device for measuring random incidence sound-absorbing coefficient/sound-absorbing quantity of material |
| CN103713046A (en) * | 2014-01-08 | 2014-04-09 | 神龙汽车有限公司 | Measuring method and device for sound-proofing quantity of perforation structure assembly |
| CN105115585A (en) * | 2015-07-23 | 2015-12-02 | 南京大学 | Measuring method for reverberation time of reverberation room |
| CN105203198A (en) * | 2015-09-15 | 2015-12-30 | 南京大学 | Method for measuring reverberation time of reverberation room |
| RU2660763C1 (en) * | 2017-06-14 | 2018-07-09 | Олег Савельевич Кочетов | Object in the reverberation chamber acoustic characteristics studying method |
| CN109324113A (en) * | 2018-09-01 | 2019-02-12 | 哈尔滨工程大学 | A kind of measurement method of reverberation tank wall surface average sound absorption coefficient |
| 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 |
| CN113237955A (en) * | 2021-05-21 | 2021-08-10 | 安徽江淮汽车集团股份有限公司 | Method and system for testing sound absorption performance of molding material |
| CN113790900A (en) * | 2021-08-11 | 2021-12-14 | 岚图汽车科技有限公司 | Vehicle sound insulation performance testing method and device and electronic equipment |
| CN114200004A (en) * | 2021-11-30 | 2022-03-18 | 重庆长安汽车股份有限公司 | Method and system for testing high-frequency-band sound absorption coefficient, electronic equipment and computer-readable storage medium |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105433A (en) * | 2013-01-15 | 2013-05-15 | 西北工业大学 | Device for measuring sound absorption coefficient of acoustic material by use of pulse method and measuring method |
| CN103364491A (en) * | 2013-07-02 | 2013-10-23 | 无锡吉兴汽车声学部件科技有限公司 | Fixture used for improving device for fixing bottom surface of acoustic component R-Cabin reverberation box of automobile |
| CN103675104A (en) * | 2013-11-26 | 2014-03-26 | 同济大学 | Method and device for measuring random incidence sound-absorbing coefficient/sound-absorbing quantity of material |
| CN103713046A (en) * | 2014-01-08 | 2014-04-09 | 神龙汽车有限公司 | Measuring method and device for sound-proofing quantity of perforation structure assembly |
| CN103713046B (en) * | 2014-01-08 | 2017-02-08 | 神龙汽车有限公司 | Measuring method and device for sound-proofing quantity of perforation structure assembly |
| CN105115585A (en) * | 2015-07-23 | 2015-12-02 | 南京大学 | Measuring method for reverberation time of reverberation room |
| CN105203198A (en) * | 2015-09-15 | 2015-12-30 | 南京大学 | Method for measuring reverberation time of reverberation room |
| RU2660763C1 (en) * | 2017-06-14 | 2018-07-09 | Олег Савельевич Кочетов | Object in the reverberation chamber acoustic characteristics studying method |
| CN109324113A (en) * | 2018-09-01 | 2019-02-12 | 哈尔滨工程大学 | A kind of measurement method of reverberation tank wall surface average sound absorption coefficient |
| CN109324113B (en) * | 2018-09-01 | 2022-01-07 | 哈尔滨工程大学 | Method for measuring average sound absorption coefficient of wall surface of reverberation pool |
| 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 |
| CN113237955A (en) * | 2021-05-21 | 2021-08-10 | 安徽江淮汽车集团股份有限公司 | Method and system for testing sound absorption performance of molding material |
| CN113237955B (en) * | 2021-05-21 | 2022-04-12 | 安徽江淮汽车集团股份有限公司 | Method and system for testing sound absorption performance of molding material |
| CN113790900A (en) * | 2021-08-11 | 2021-12-14 | 岚图汽车科技有限公司 | Vehicle sound insulation performance testing method and device and electronic equipment |
| CN113790900B (en) * | 2021-08-11 | 2024-01-09 | 岚图汽车科技有限公司 | Vehicle sound insulation performance test method and device and electronic equipment |
| CN114200004A (en) * | 2021-11-30 | 2022-03-18 | 重庆长安汽车股份有限公司 | Method and system for testing high-frequency-band sound absorption coefficient, electronic equipment and computer-readable storage medium |
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Application publication date: 20120425 |