CN103969071A - Method and device for measuring noise reduction amount and pressure loss of silencer - Google Patents
Method and device for measuring noise reduction amount and pressure loss of silencer Download PDFInfo
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- CN103969071A CN103969071A CN201410193660.6A CN201410193660A CN103969071A CN 103969071 A CN103969071 A CN 103969071A CN 201410193660 A CN201410193660 A CN 201410193660A CN 103969071 A CN103969071 A CN 103969071A
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Abstract
The invention relates to a method and device for measuring the noise reduction amount and the pressure loss of a silencer. The method comprises the following steps that (1) a signal emission module emits sound signals to a pipeline; (2) a sound pressure signal collecting module collects the sound pressure signals of empty pipes and the sound pressure signals, existing when the silencer is installed, of a sound receiving chamber; (3) an airflow velocity measuring module measures airflow velocity signals in upstream pipes; (4) an airflow pressure measuring module measures the static pressure and the dynamic pressure of airflow in the upstream pipes and downstream pipes after the silencer is installed; (5) a signal processing module receives the sound pressure signals, the airflow velocity signals and air pressure signals, calculates the noise reduction amount, the pressure loss and the flow, and transmits the noise reduction amount, the pressure loss and the flow to a display module and a storage and report generation module; (6) the display module displays intermediate parameters, the noise reduction amount, the pressure loss and the flow; (7) the storage and report generation module stores measurement data and the calculation results of the noise reduction amount, the pressure loss and the flow and generates a test report. The method and device for measuring the noise reduction amount and the pressure loss of the silencer have the advantages that precision is high, speed is high, and data processing is integral.
Description
Technical field
The present invention relates to a kind of sound suppressor measuring technique, especially relate to measuring method and the measurement mechanism thereof of a kind of sound suppressor sound deadening capacity and the pressure loss.
Background technology
Noise of equipment is one of main source of neighbourhood noise, and severe jamming people's work and rest, is detrimental to health.At the equipment inlet ends such as heating ventilation and air-conditioning pipe system, blower fan, air compressor machine, gas engine and exhaust end, fixing a silencer is the effective means of controlling noise transmission.The sound deadening capacity of sound suppressor and the pressure loss are to identify sound suppressor quality, the important parameter that carries out noise control engineering design.Also there is no at present the professional measuring equipment for sound suppressor.Traditional measurement method need to be measured the intermediate data such as sound pressure level, air-flow static pressure and dynamic pressure, then by manually calculating sound deadening capacity, the pressure loss and air flow rate, causes in-site measurement task very heavy, and measuring accuracy is limited.
Summary of the invention
Object of the present invention is exactly sound suppressor sound deadening capacity and pressure loss measuring method and the measurement mechanism thereof that provides in order to overcome the defect that above-mentioned existing measuring technique exists that a kind of measuring process is directly perceived, precision is high, speed is fast, can generate in real time test report.
Object of the present invention can be achieved through the following technical solutions:
A measuring method for sound suppressor sound deadening capacity and the pressure loss, is characterized in that, comprises the following steps:
1) signal emission module is sent octave band noise or white noise signal by digital signal generation unit, digital-to-analog conversion card, power amplifier and the loudspeaker connecting successively in pipeline;
2) sound pressure signal acquisition module by microphone, prime amplifier, analog-to-digital conversion card and the digital signal reception unit connecting successively, gather respectively blank pipe and two operating modes that fix a silencer under sound pressure signal in sound receiving room, and passed to signal processing module;
3) gas velocity measurement module: measure the gas velocity in upstream line, and passed to signal processing module by the airspeedometer, the analog-to-digital conversion card that connect successively;
4) gas flow pressure measurement module: static pressure and the dynamic pressure of air-flow in upstream and downstream pipeline after fixing a silencer by the barometer that connects successively and analog-to-digital conversion card measurement, and passed to signal processing module;
5) signal processing module calculates sound suppressor octave band sound deadening capacity and A weighted sound deadening capacity according to the sound pressure signal in sound receiving room under blank pipe and two operating modes that fix a silencer, according to the static pressure of air-flow in upstream and downstream pipeline and the dynamic pressure calculation pressure loss, according to air-flow velocity in upstream line and pipeline section area calculated flow rate, and passed to display module, storage and report generation module;
6) display module shows middle parameter, sound deadening capacity, the pressure loss and flow;
7) storage and report generation module stores measurement data, sound deadening capacity, the pressure loss and flow rate calculation result, and generate test report.
The running parameter of described signal emission module comprises acoustical signal transmission channel, signal amplitude, the duration that transmits, noise signal type, each band signal amplitude weighting value.
Described noise signal type comprises: octave band noise signal and white noise signal.
The running parameter of described sound pressure signal acquisition module comprises signal sampling channel, signal sampling frequency, brush screen cycle and signal averaging duration.
The running parameter of described gas velocity measurement module comprises signal sampling channel, signal sampling frequency and signal averaging duration.
The running parameter of described gas flow pressure measurement module comprises signal sampling channel, signal sampling frequency and signal averaging duration.
The octave band sound deadening capacity of described sound suppressor and A weighted sound deadening capacity, the pressure loss and flow rate calculation concrete steps are:
1) running parameter of signalization transmitter module harmony signal acquisition module is launched octave band noise or white noise in pipeline, measures respectively blank pipe and fixes a silencer OBSPL and the A-weighted sound level in sound receiving room under two operating modes;
2) running parameter of gas velocity measurement module is set, measures the gas velocity in upstream line;
3) running parameter of gas flow pressure measurement module is set, measures dynamic pressure and the static pressure of the interior air-flow of upstream and downstream pipeline after fixing a silencer;
4) signal processing module utilizes blank pipe and the fix a silencer OBSPL in sound receiving room and A-weighted sound level under two operating modes calculate octave band sound deadening capacity and the A weighted sound deadening capacity of sound suppressor; According to the pressure loss of the static pressure of air-flow in upstream and downstream pipeline and dynamic pressure calculation sound suppressor; According to the gas velocity in upstream line and pipeline section area calculated flow rate.
The measurement mechanism of a kind of sound suppressor sound deadening capacity and pressure loss measuring method, it is characterized in that, comprise signal emission module, pipeline, sound pressure signal acquisition module, gas velocity measurement module, gas flow pressure measurement module, signal processing module, display module, storage and report generation module; Described signal processing module is connected with sound pressure signal acquisition module, gas velocity measurement module, gas flow pressure measurement module, display module, storage and report generation module respectively, and real-time processing, storage and the test report of being responsible for acoustic pressure and airflow signal generate.
Described signal emission module is sent octave band noise or white noise signal by digital signal generation unit, digital-to-analog conversion card, power amplifier and the loudspeaker connecting successively to pipeline: described digital signal generation unit is programmed and produced octave band noise or white noise signal by LabVIEW, by digital-to-analog conversion card, convert digital signal to simulating signal, feed-in loudspeaker after amplifying by power amplifier.
Described pipeline comprises that sound source is to the upstream line between sound suppressor or alternative pipe, and the downstream line between sound suppressor or alternative Guan Zhi sound receiving room.
Described sound pressure signal acquisition module by microphone, prime amplifier, analog-to-digital conversion card and the digital signal reception unit connecting successively, gather respectively blank pipe and two operating modes that fix a silencer under sound pressure signal in sound receiving room, and passed to signal processing module.
Described gas velocity measurement module, by the airspeedometer and the analog-to-digital conversion card that connect successively, is measured the gas velocity signal in upstream line, and is passed to signal processing module.
Described gas flow pressure measurement module, by the stream pressure meter and the analog-to-digital conversion card that connect successively, is measured air-flow static pressure and dynamic pressure in upstream and downstream pipeline after fixing a silencer, and is passed to signal processing unit.
Described signal processing module calculates octave band sound deadening capacity and the A weighted sound deadening capacity of sound suppressor according to the sound pressure signal in sound receiving room under blank pipe and two operating modes that fix a silencer, according to the static pressure of air-flow in upstream and downstream pipeline after fixing a silencer and the dynamic pressure calculation pressure loss, according to the gas velocity in upstream line and pipeline section area calculated flow rate, and passed to display module, storage and report generation module.
The octave band sound deadening capacity of described sound suppressor and A weighted sound deadening capacity, the pressure loss and flow rate calculation concrete steps are:
1) running parameter of signalization transmitter module harmony signal acquisition module is launched octave band noise or white noise in pipeline, measures each OBSPL in sound receiving room in blank pipe situation and is designated as L
p0.A weighted sound level is designated as L
p0A. each OBSPL of measuring in the situation Kuang Xia sound receiving room that fixes a silencer is designated as L
p1, A-weighted sound level is designated as L
p1A, unit is dB;
2) running parameter of gas velocity measurement module is set, the gas velocity of measuring in upstream line is designated as v
u, unit is m/s;
3) running parameter of gas flow pressure measurement module is set, the dynamic pressure of measuring the interior air-flow of upstream line after fixing a silencer is designated as p
vu, static pressure is designated as p
su, in downstream line, the dynamic pressure of air-flow is designated as p
vd, and static pressure is designated as p
sd, unit is Pa;
4) each octave band sound deadening capacity that signal processing module utilizes blank pipe and the fix a silencer OBSPL in sound receiving room and A-weighted sound level under two operating modes calculate sound suppressor is designated as D, and unit is dB:
D＝L
p0-L
p1：
A weighted sound deadening capacity is designated as D
a, unit is dBA:
D
A＝L
p0A-L
p1A；
According to the pressure loss of the static pressure of air-flow in upstream and downstream pipeline and dynamic pressure calculation sound suppressor, be designated as Δ p, unit is Pa:
Δp＝(p
vu+p
su)-(p
vd+p
sd)；
When sound suppressor two ends pipeline section area is identical, the pressure loss can be calculated by following formula:
Δp＝p
su-p
sd：
According to the gas velocity v in upstream line
ube designated as U with pipeline section area S calculated flow rate, unit is m
3/ s:
U＝v
u*S。
Described display module comprises acoustic pressure time-domain signal display unit, sound pressure level display unit, sound deadening capacity display unit, pressure loss display unit, flow quantity display unit:
Wherein, described acoustic pressure time-domain signal display unit shows the acoustic pressure time-domain signal curve in sound receiving room in real time, described sound pressure level display unit demonstration OBSPL curve and list thereof, A-weighted sound level, described sound deadening capacity display unit shows the list of octave band sound deadening capacity and the A weighted sound deadening capacity of frequency centered by 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000Hz, described pressure loss display unit shows the pressure loss of sound suppressor, and described flow quantity display unit shows the air flow rate in upstream line.
Described storage and report generation module comprise sound pressure level storage unit, sound deadening capacity storage unit, pressure loss storage unit, flow storage unit, detecting information edit cell, test report generation unit, test report storage unit, test report print unit.
Wherein, OBSPL and A-weighted sound level under described sound pressure level cell stores blank pipe and latter two operating mode that fixes a silencer in sound receiving room, described sound deadening capacity cell stores is with 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, the octave band sound deadening capacity of frequency and A weighted sound deadening capacity centered by 8000Hz, the pressure loss of described pressure loss cell stores sound suppressor, gas velocity and the flow of described flow cell stores upstream line, described detecting information edit cell editor detecting information, described test report generation unit generates test report, described test report cell stores test report, described test report print unit printing test report.
Compared with prior art, the present invention has measuring process robotization, and data collection visualization can generate test report in real time, can be used for the real-time measurement of sound suppressor sound deadening capacity and the pressure loss.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
As shown in Figure 1, the present invention is positioned at semianechoic room distance mouth of pipe center 1m 45 degree direction place OBN sound pressure level and A-weighted sound levels far away before and after measuring ventilating duct insertion sound suppressor, obtain each octave band sound deadening capacity of sound suppressor and A weighted sound deadening capacity, by the gas velocity in the airspeedometer measuring channel upstream line is arranged, by the pressure loss of the barometric surveying sound suppressor arranged in upstream and downstream pipeline.Described measuring method comprises signal emission module 11, sound pressure signal acquisition module 12, gas velocity measurement module 13, gas flow pressure measurement module 14, signal processing module 15, display module 16 and storage and report generation module 17, and described signal processing module 15 is connected with sound pressure signal acquisition module 12, gas velocity measurement module 13, gas flow pressure measurement module 14, display module 16, storage and report generation module 17 respectively.
Described signal emission module 11 is by digital signal generation unit, digital-to-analog conversion card, power amplifier and loudspeaker collaborative work, in pipeline, send octave band noise or white noise, described sound pressure signal acquisition module 12 is by the microphone connecting successively, prime amplifier, analog-to-digital conversion card and digital signal reception unit gather respectively blank pipe and fix a silencer the sound pressure signal in sound receiving room under two operating modes, passed to signal processing module 15, described gas velocity measurement module 13 is by the airspeedometer and the analog-to-digital conversion card that connect successively, measure the gas velocity signal in upstream line, and passed to signal processing module 15, static pressure and the dynamic pressure of the air-flow after described gas flow pressure measurement module 14 fixes a silencer by the stream pressure meter that connects successively and analog-to-digital conversion card measurement in upstream and downstream pipeline, and passed to signal processing module 15, described signal processing module 15 calculates octave band sound deadening capacity and the A weighted sound deadening capacity of sound suppressor according to the sound pressure signal in sound receiving room under blank pipe and two operating modes that fix a silencer, according to the static pressure of air-flow in upstream and downstream pipeline after fixing a silencer and the dynamic pressure calculation pressure loss, according to the gas velocity in upstream line and pipeline section area calculated flow rate, and passed to display module 16, storage and report generation module 17,
Below illustrate measuring process of the present invention:
To sound suppressor ZP100 (physical dimension 1200mm * 700mm * 600mm, flange size 500mm * 400mm effective length 1000mm, interpolation a slice, thickness 100mm), measure respectively blank pipe and add ZP100 sound suppressor to be respectively OBSPL and the A-weighted sound level under 0m/s (static state), 3m/s, 6m/s, 9m/s condition in gas velocity, each measurement all carried out according to the following steps:
1) the parameter setting of acoustical signal transmitter module: setting signal sample frequency is that 44100Hz, signal amplitude are 1, signal duration is 60s, and signal is selected white noise signal.By input signal amplitude weighting value below the octave band different (centre frequency is respectively 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000Hz), make the frequency response of each frequency band of loudspeaker basically identical, according to instrument connection, select output signal channel.
2) the parameter setting of acoustic pressure acquisition module: select microphone to demarcate or measure in real time.Microphone timing signal input spot frequency 1000Hz.While selecting to measure in real time, according to instrument connection, select input signal channel, input collection signal sample frequency 44100, the average duration 30s of collection signal, brush screen cycle 1s, the mode of stopping comprises setting " operation duration " or " manually stopping ";
3) measure in real time: display module shows that time-domain diagram, the centre frequency of sound pressure signal in the sound receiving room gathering are respectively OBSPL curve and the list thereof of 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000Hz in real time, A sound level, data are upgraded once every 1s.Display module also shows the pressure loss of gas velocity in upstream line and flow, sound suppressor.
4) processing of data and storage: testing apparatus end of run, display module can show the measured values such as sound deadening capacity, the pressure loss, gas velocity and flow of sound suppressor, storage and report generation module meeting stores it, and generate test report.Measurement result is as shown in table 1:
Table 1 gas velocity and sound suppressor sound deadening capacity measurement result
Table 2: air flow rate, gas velocity and sound suppressor pressure loss measurement result
Claims (10)
1. a measuring method for sound suppressor sound deadening capacity and the pressure loss, is characterized in that, comprises the following steps:
1) signal emission module is sent octave band noise or white noise signal by digital signal generation unit, digital-to-analog conversion card, power amplifier and the loudspeaker connecting successively in pipeline;
2) sound pressure signal acquisition module by microphone, prime amplifier, analog-to-digital conversion card and the digital signal reception unit connecting successively, gather respectively blank pipe and two operating modes that fix a silencer under sound pressure signal in sound receiving room, and passed to signal processing module;
3) gas velocity measurement module is measured the gas velocity signal in upstream line, and is passed to signal processing module;
4) static pressure and the dynamic pressure of air-flow in upstream and downstream pipeline after gas flow pressure measurement module measurement fixes a silencer, and passed to signal processing module;
5) signal processing module according to blank pipe and and the sound pressure signal in sound receiving room under two operating modes that fixes a silencer calculate sound suppressor octave band sound deadening capacity and A weighted sound deadening capacity, according to the pressure loss of the static pressure of air-flow in upstream and downstream pipeline and dynamic pressure calculation sound suppressor, according to the gas velocity in upstream line and pipeline section area calculated flow rate, and passed to display module, storage and report generation module;
6) display module shows middle parameter, sound deadening capacity, the pressure loss and flow;
7) storage and report generation module stores measurement data, sound deadening capacity, the pressure loss and flow rate calculation result, and generate test report.
2. the sound deadening capacity of a kind of sound suppressor according to claim 1 and pressure loss measuring method, it is characterized in that, the running parameter of described signal emission module comprises acoustical signal transmission channel, signal amplitude, the duration that transmits, noise signal type, each band signal amplitude weighting value;
Described noise signal type comprises: octave band noise signal and white noise signal.
3. the sound deadening capacity of a kind of sound suppressor according to claim 1 and pressure loss measuring method, is characterized in that, the running parameter of described sound pressure signal acquisition module comprises signal sampling channel, signal sampling frequency, brush screen cycle and signal averaging duration;
The running parameter of described gas velocity measurement module comprises signal sampling channel, signal sampling frequency and signal averaging duration;
The running parameter of described gas flow pressure measurement module comprises signal sampling channel, signal sampling frequency and signal averaging duration.
4. the measuring method of a kind of sound suppressor sound deadening capacity according to claim 1 and the pressure loss, is characterized in that, the octave band sound deadening capacity of described sound suppressor and A weighted sound deadening capacity, the pressure loss and flow rate calculation concrete steps are:
1) running parameter of signalization transmitter module harmony signal acquisition module is launched octave band noise or white noise in pipeline, measures each OBSPL in sound receiving room in blank pipe situation and is designated as L
p0.A weighted sound level is designated as L
p0A. each OBSPL of measuring in the situation Kuang Xia sound receiving room that fixes a silencer is designated as L
p1, A-weighted sound level is designated as L
p1A, unit is dB;
2) running parameter of gas velocity measurement module is set, the gas velocity of measuring in upstream line is designated as v
u, unit is m/s;
3) running parameter of gas flow pressure measurement module is set, the dynamic pressure of measuring the interior air-flow of upstream line after fixing a silencer is designated as p
vu, static pressure is designated as p
su, in downstream line, the dynamic pressure of air-flow is designated as p
vd, and static pressure is designated as p
sd, unit is Pa:
4) each octave band sound deadening capacity that signal processing module utilizes blank pipe and the fix a silencer OBSPL in sound receiving room and A-weighted sound level under two operating modes calculate sound suppressor is designated as D, and unit is dB:
D＝L
p0—L
p1；
A weighted sound deadening capacity is designated as D
a, unit is dBA:
D
A＝L
p0A-L
p1A；
According to the pressure loss of the static pressure of air-flow in upstream and downstream pipeline and dynamic pressure calculation sound suppressor, be designated as Δ p, unit is Pa:
Δp＝(p
vu+p
su)-(p
vd+p
sd)；
When sound suppressor two ends pipeline section area is identical, the pressure loss can be calculated by following formula:
Δp＝p
su-p
sd；
According to the gas velocity v in upstream line
ube designated as U with pipeline section area S calculated flow rate, unit is m
3/ s:
U＝v
u*S。
5. the measurement mechanism of a kind of sound suppressor sound deadening capacity according to claim 1 and pressure loss measuring method, it is characterized in that, comprise signal emission module, pipeline, sound pressure signal acquisition module, gas velocity measurement module, gas flow pressure measurement module, signal processing module, display module, storage and report generation module; Described signal emission module is responsible for sending octave band noise or white noise signal in pipeline: described signal processing module is connected with sound pressure signal acquisition module, gas velocity measurement module, gas flow pressure measurement module, display module, storage and report generation module respectively, and Real-time Collection, processing, demonstration, storage and the test report of being responsible for acoustic pressure, airflow signal generate.
6. the measurement mechanism of a kind of sound suppressor sound deadening capacity according to claim 5 and pressure loss measuring method, it is characterized in that, described signal emission module is sent octave band noise or white noise signal by digital signal generation unit, digital-to-analog conversion card, power amplifier and the loudspeaker connecting successively in pipeline; Described digital signal generation unit is programmed and is produced octave band or white noise signal by LabVIEW, by digital-to-analog conversion card, converts digital signal to simulating signal, feed-in loudspeaker after amplifying by power amplifier.
7. the measurement mechanism of a kind of sound suppressor sound deadening capacity according to claim 5 and pressure loss measuring method, it is characterized in that, described pipeline comprises that sound source is to the upstream line between sound suppressor or alternative pipe, and the downstream line between sound suppressor or alternative Guan Zhi sound receiving room.
8. the measurement mechanism of a kind of sound suppressor sound deadening capacity according to claim 5 and pressure loss measuring method, it is characterized in that, described sound pressure signal acquisition module by microphone, prime amplifier, analog-to-digital conversion card and the digital signal reception unit connecting successively, gather respectively blank pipe and two operating modes that fix a silencer under sound pressure signal in sound receiving room, and passed to signal processing module;
Described gas velocity measurement module is measured the gas velocity in upstream line, and is passed to signal processing module;
Static pressure and the dynamic pressure of air-flow in upstream and downstream pipeline after described gas flow pressure measurement module measurement fixes a silencer, and passed to signal processing module;
Described signal processing module calculates octave band sound deadening capacity and the A weighted sound deadening capacity of sound suppressor according to the sound pressure signal in sound receiving room under blank pipe and two operating modes that fix a silencer, according to the static pressure of air-flow in upstream and downstream pipeline after fixing a silencer and the dynamic pressure calculation pressure loss, according to the gas velocity in upstream line and pipeline section area calculated flow rate, and passed to display module, storage and report generation module.
9. the measurement mechanism of a kind of sound suppressor according to claim 5 and pressure loss sound deadening capacity measuring method, it is characterized in that, described display module comprises acoustic pressure time-domain signal display unit, sound pressure level display unit, sound deadening capacity display unit, pressure loss display unit, flow quantity display unit:
Wherein, described acoustic pressure time-domain signal display unit shows acoustic pressure time-domain signal curve in sound receiving room in real time, described sound pressure level display unit shows with 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, sound pressure level curve and the list thereof of the octave band of frequency centered by 8000Hz, A-weighted sound level, described sound deadening capacity display unit shows with 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, the octave band sound deadening capacity list of frequency and A weighted sound deadening capacity centered by 8000Hz, described pressure loss display unit shows the pressure loss of sound suppressor, described flow quantity display unit shows the air flow rate in upstream line.
10. the measurement mechanism of a kind of sound suppressor sound deadening capacity according to claim 5 and pressure loss measuring method, it is characterized in that, described storage and report generation module comprise sound pressure level storage unit, sound deadening capacity storage unit, pressure loss storage unit, flow storage unit, detecting information edit cell, test report generation unit, test report storage unit, test report print unit.
Wherein, described sound pressure level cell stores is with 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, the OBSPL of frequency and A-weighted sound level centered by 8000Hz, described sound deadening capacity cell stores is with 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, the sound deadening capacity of the octave band of frequency and A weighted sound deadening capacity centered by 8000Hz, the described pressure loss cell stores pressure loss, gas velocity and the flow of described flow cell stores upstream line, described detecting information edit cell editor detecting information, described test report generation unit generates test report, described test report cell stores test report, described test report print unit printing test report.
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| CN104374593A (en) * | 2014-11-18 | 2015-02-25 | 江苏兆胜空调有限公司 | Testing device for wind distributor |
| JP6220098B1 (en) * | 2014-11-28 | 2017-10-25 | ゴーアテック インコーポレイテッドＧｏｅｒｔｅｋ Ｉｎｃ | Test apparatus and test method for impedance characteristics and capacity expansion performance of sound absorbing material |
| CN104677657A (en) * | 2014-12-16 | 2015-06-03 | 深圳中雅机电实业有限公司 | Method for measuring acoustic performance of side-by-side sound absorber type silencer |
| CN104677657B (en) * | 2014-12-16 | 2017-12-05 | 深圳中雅机电实业有限公司 | To the method that sound absorber formula silencer acoustical behavior measures side by side |
| CN105203316B (en) * | 2015-10-22 | 2018-11-13 | 清华大学苏州汽车研究院（相城） | A kind of double mouth silencer of high-precision transmits loss experimental rig and test method |
| CN105203316A (en) * | 2015-10-22 | 2015-12-30 | 清华大学苏州汽车研究院（相城） | Testing device and testing method of transmission loss of high-precision double-discharge-opening silencer |
| CN106949957A (en) * | 2017-02-14 | 2017-07-14 | 同济大学 | It is a kind of to have the measurement apparatus for flowing silencer element acoustic characteristic and flow behavior under environment |
| CN109141519A (en) * | 2018-07-11 | 2019-01-04 | 同济大学 | A kind of testboard bay tested for silencer element acoustics and flow field characteristic |
| CN109141519B (en) * | 2018-07-11 | 2021-09-03 | 同济大学 | Test bench for testing acoustic and flow field characteristics of silencing element |
| CN109324115A (en) * | 2018-09-01 | 2019-02-12 | 哈尔滨工程大学 | The method of charging line silencer is evaluated in a kind of reverberation tank |
| CN109752151A (en) * | 2018-12-30 | 2019-05-14 | 珠海市广源信科技有限公司 | A kind of muffler measuring device |
| CN110823615A (en) * | 2019-10-16 | 2020-02-21 | 中国人民解放军92578部队 | Performance test evaluation system for active and passive composite muffler of ventilation pipeline |
| CN111157615A (en) * | 2019-12-31 | 2020-05-15 | 清华大学 | Sound wave cloud chamber |
| CN111157615B (en) * | 2019-12-31 | 2022-07-12 | 清华大学 | Sound wave cloud chamber |
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