CN103969071B - The measuring method of acoustic filter sound deadening capacity and the pressure loss and measurement apparatus thereof - Google Patents
The measuring method of acoustic filter sound deadening capacity and the pressure loss and measurement apparatus thereof Download PDFInfo
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Abstract
The present invention relates to the measuring method of a kind of acoustic filter sound deadening capacity and the pressure loss and measurement apparatus thereof, described measuring method comprises the following steps: 1) signal emission module sends acoustical signal to pipeline；2) sound pressure signal acquisition module gathers blank pipe and the sound pressure signal installed after acoustic filter in sound receiving room；3) gas velocity measurement module measures the air velocity signal in upstream line；4) gas flow pressure measurement module measures the static pressure and dynamic pressure of installing air-flow in upstream and downstream pipeline after acoustic filter；5) signal processing module receives acoustic pressure, flow velocity and air pressure signal, calculates sound deadening capacity, the pressure loss and flow, and is passed along display module, storage and report generation module；6) parameter, sound deadening capacity, the pressure loss and flow in the middle of display module display；7) storage and report generation module stores measurement data, sound deadening capacity, the pressure loss and volume computation, and generate test report.The present invention has the advantage such as precision height, fast, the data process integration of speed.
Description
Technical field
The present invention relates to a kind of acoustic filter measurement technology, especially relate to measuring method and the measurement apparatus thereof of a kind of acoustic filter sound deadening capacity and the pressure loss.
Background technology
Noise of equipment is one of main source of environment noise, and severe jamming people's work and rest is detrimental to health.Installing acoustic filter at the equipment inlet ends such as heating ventilation and air-conditioning pipe-line system, blower fan, air compressor machine, gas engine and exhaust end is the effective means controlling noise transmission.The sound deadening capacity of acoustic filter and the pressure loss are qualification acoustic filter quality, carry out the important parameter of noise control engineering design.There is presently no the professional measurement device for acoustic filter.Traditional measurement method needs to measure the intermediate data such as sound pressure level, air-flow static pressure and dynamic pressure, then passes through artificial calculating and obtains sound deadening capacity, the pressure loss and air flow rate, causes that in-site measurement task is very heavy, and certainty of measurement is limited.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned existing measurement technology to exist and provide and a kind of measure that process is directly perceived, precision is high, speed is fast, the acoustic filter sound deadening capacity of test report can be generated in real time and pressure loss measuring method and measurement apparatus thereof.
The purpose of the present invention can be achieved through the following technical solutions:
The measuring method of a kind of acoustic filter sound deadening capacity and the pressure loss, it is characterised in that comprise the following steps:
1) signal emission module generates unit, digital-to-analogue conversion card, power amplifier and speaker by the digital signal being sequentially connected with and sends octave band noise or white noise signal in pipeline；
2) sound pressure signal acquisition module gathers blank pipe and the sound pressure signal installed under two operating modes of acoustic filter in sound receiving room respectively by the microphone being sequentially connected with, preamplifier, analog-to-digital conversion card and numeral signal receiving unit, and is passed along signal processing module；
3) gas velocity measurement module: measure the air velocity in upstream line by the pneumotachometer being sequentially connected with, analog-to-digital conversion card, and be passed along signal processing module；
4) gas flow pressure measurement module: measured the static pressure and dynamic pressure of installing air-flow in upstream and downstream pipeline after acoustic filter by the barometer being sequentially connected with and analog-to-digital conversion card, and be passed along signal processing module；
5) signal processing module calculates acoustic filter octave band sound deadening capacity and A weighted sound deadening capacity according to blank pipe and the sound pressure signal installed under two operating modes of acoustic filter in sound receiving room, 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 areal calculation flow, and it is passed along display module, storage and report generation module；
6) parameter, sound deadening capacity, the pressure loss and flow in the middle of display module display；
7) storage and report generation module stores measurement data, sound deadening capacity, the pressure loss and volume computation, and generate test report.
The running parameter of described signal emission module includes acoustical signal transmission channel, signal amplitude, transmitting signal duration, noise signal type, each band signal amplitude weighting value.
Described noise signal type includes: octave band noise signal and white noise signal.
The running parameter of described sound pressure signal acquisition module includes signal sampling channel, signal sampling frequency, brush screen cycle and signal averaging duration.
The running parameter of described gas velocity measurement module includes signal sampling channel, signal sampling frequency and signal averaging duration.
The running parameter of described gas flow pressure measurement module includes signal sampling channel, signal sampling frequency and signal averaging duration.
Octave band sound deadening capacity and A weighted sound deadening capacity, the pressure loss and the flow rate calculation of described acoustic filter concretely comprise the following steps:
1) signal emission module and the running parameter of acoustic pressure signal acquisition module are set, in pipeline, launch octave band noise or white noise, measure blank pipe and the OBSPL installed under two operating modes of acoustic filter in sound receiving room and A-weighted sound level respectively；
2) running parameter of gas velocity measurement module is set, measures the air velocity in upstream line；
3) running parameter of gas flow pressure measurement module is set, measures dynamic pressure and static pressure that air-flow in upstream and downstream pipeline after acoustic filter is installed；
4) signal processing module utilizes blank pipe and the OBSPL installed under two operating modes of acoustic filter in sound receiving room and A-weighted sound level to calculate octave band sound deadening capacity and the A weighted sound deadening capacity of acoustic filter；The pressure loss according to the static pressure of air-flow in upstream and downstream pipeline and dynamic pressure calculation acoustic filter；According to the air velocity in upstream line and pipeline section areal calculation flow.
A kind of measurement apparatus of the measuring method of acoustic filter sound deadening capacity and the pressure loss, it is characterized in that, including 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, is responsible for acoustic pressure and the process in real time of airflow signal, storage and test report generate.
Described signal emission module generates unit, digital-to-analogue conversion card, power amplifier and speaker by the digital signal being sequentially connected with and sends octave band noise or white noise signal to pipeline；Described digital signal generates unit and produces octave band noise or white noise signal by LabVIEW programming, digital-to-analogue conversion card convert digital signals into analogue signal, feed-in speaker after being amplified by power amplifier.
Described pipeline includes sound source and to acoustic filter or substitutes the upstream line between pipe, and acoustic filter or substitute pipe to the downstream line between sound receiving room.
Described sound pressure signal acquisition module gathers blank pipe and the sound pressure signal installed under two operating modes of acoustic filter in sound receiving room respectively by the microphone being sequentially connected with, preamplifier, analog-to-digital conversion card and numeral signal receiving unit, and is passed along signal processing module.
Described gas velocity measurement module, by the pneumotachometer being sequentially connected with and analog-to-digital conversion card, is measured the air velocity signal in upstream line, and is passed along signal processing module.
Described gas flow pressure measurement module passes through the stream pressure meter and the analog-to-digital conversion card that are sequentially connected with, the air-flow static pressure in upstream and downstream pipeline and dynamic pressure after measurement installation acoustic filter, and is passed along signal processing unit.
Described signal processing module calculates octave band sound deadening capacity and the A weighted sound deadening capacity of acoustic filter according to the sound pressure signal in sound receiving room under blank pipe and installation two operating modes of acoustic filter, according to static pressure and the dynamic pressure calculation pressure loss of installing air-flow in upstream and downstream pipeline after acoustic filter, according to the air velocity in upstream line and pipeline section areal calculation flow, and it is passed along display module, storage and report generation module.
Octave band sound deadening capacity and A weighted sound deadening capacity, the pressure loss and the flow rate calculation of described acoustic filter concretely comprise the following steps:
1) arranging signal emission module and the running parameter of acoustic pressure signal acquisition module, launch octave band noise or white noise in pipeline, each OBSPL measured in blank pipe situation in sound receiving room is designated as Lp0, A-weighted sound level is designated as Lp0A, measure each OBSPL installed in acoustic filter situation in sound receiving room and be designated as Lp1, A-weighted sound level is designated as Lp1A, unit is dB；
2) arranging the running parameter of gas velocity measurement module, the air velocity measured in upstream line is designated as vu, and unit is m/s；
3) arranging the running parameter of gas flow pressure measurement module, after measuring installation acoustic filter, in upstream line, the dynamic pressure of air-flow is designated as pvu, static pressure is designated as psu, in downstream line, the dynamic pressure of air-flow is designated as pvd, and static pressure is designated as psd, unit is Pa；
4) signal processing module utilizes each octave band sound deadening capacity that blank pipe and the OBSPL installed under two operating modes of acoustic filter in sound receiving room and A-weighted sound level calculate acoustic filter to be designated as D, and unit is dB:
D=Lp0—Lp1；
A weighted sound deadening capacity is designated as DA, unit is dBA:
DA=Lp0A—Lp1A；
Being designated as Δ p according to the static pressure of air-flow in upstream and downstream pipeline and the pressure loss of dynamic pressure calculation acoustic filter, unit is Pa:
Δ p=(pvu+psu)—(pvd+psd)；
When acoustic filter two ends pipeline section area is identical, the pressure loss can be calculated by following formula:
Δ p=psu—psd；
According to the air velocity v in upstream lineuBeing designated as U with pipeline section area S calculated flow rate, unit is m3/ s:
U=vu*S。
Described display module includes 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 display OBSPL curve and list, A-weighted sound level, described sound deadening capacity display unit shows octave band sound deadening capacity list and the A weighted sound deadening capacity of frequency centered by 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000Hz, the pressure loss of described pressure loss display unit display acoustic filter, the described air flow rate in flow quantity display unit display upstream line.
Described storage and report generation module include sound pressure level memory element, sound deadening capacity memory element, pressure loss memory element, flow memory element, test information compiling unit, test report generation unit, test report memory element, test report print unit.
Wherein, OBSPL in sound receiving room and A-weighted sound level under described sound pressure level memory element storage blank pipe and installation latter two operating mode of acoustic filter, described sound deadening capacity memory element stores 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 memory element storage acoustic filter, the air velocity of described flow memory element storage upstream line and flow, described test information compiling unit editor tests information, described test report generates unit and generates test report, described test report memory element storage test report, described test report print unit printing test report.
Compared with prior art, the present invention has and measured process automation, and data collection visualization can generate test report in real time, can be used for the real-time measurement of acoustic filter sound deadening capacity and the pressure loss.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
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 remote 45 degree of directions place's OBN sound pressure level and A-weighted sound level by measuring before and after ventilation shaft insertion acoustic filter, obtain each octave band sound deadening capacity of acoustic filter and A weighted sound deadening capacity, the air velocity in pipeline is measured, the pressure loss of the barometric surveying acoustic filter by arranging in upstream and downstream pipeline by the pneumotachometer arranged in upstream line.Described measuring method includes 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 generates unit by digital signal, digital-to-analogue conversion card, power amplifier and speaker collaborative work, octave band noise or white noise is sent in pipeline, the described sound pressure signal acquisition module 12 microphone by being sequentially connected with, preamplifier, analog-to-digital conversion card and numeral signal receiving unit gather blank pipe and the sound pressure signal installed under two operating modes of acoustic filter in sound receiving room respectively, it is passed along signal processing module 15, described gas velocity measurement module 13 is by the pneumotachometer being sequentially connected with and analog-to-digital conversion card, measure the air velocity signal in upstream line, and it is passed along signal processing module 15, described gas flow pressure measurement module 14 measures static pressure and the dynamic pressure of the air-flow installed after acoustic filter in upstream and downstream pipeline by the stream pressure meter being sequentially connected with and analog-to-digital conversion card, and it is passed along signal processing module 15, described signal processing module 15 calculates octave band sound deadening capacity and the A weighted sound deadening capacity of acoustic filter according to the sound pressure signal in sound receiving room under blank pipe and installation two operating modes of acoustic filter, according to static pressure and the dynamic pressure calculation pressure loss of installing air-flow in upstream and downstream pipeline after acoustic filter, according to the air velocity in upstream line and pipeline section areal calculation flow, and it is passed along display module 16, storage and report generation module 17；
The measurement process of the present invention illustrated below:
To acoustic filter ZP100 (overall dimensions 1200mm × 700mm × 600mm, flange size 500mm × 400mm effective length 1000mm, interpolation is a piece of, thickness 100mm), measure blank pipe respectively and add the ZP100 acoustic filter OBSPL when air velocity respectively 0m/s (static state), 3m/s, 6m/s, 9m/s and A-weighted sound level, measuring every time and perform all according to the following steps:
1) parameter of acoustical signal transmitter module is arranged: setting signal sample frequency is 44100Hz, signal amplitude is 1, signal duration is 60s, signal behavior white noise signal.By inputting signal amplitude weighted value below in different octave bands (mid frequency is 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000Hz respectively), the frequency response making each frequency band of speaker is basically identical, selects output signal channel according to instrument connection.
2) parameter of acoustic pressure acquisition module is arranged: select microphone demarcate or measure in real time.Microphone timing signal input spot frequency 1000Hz.When selecting to measure in real time, selecting input signal channel, input to gather signal sampling frequency 44100, gather signal averaging duration 30s, brush screen cycle 1s according to instrument connection, stopping mode including setting " operation duration " or " manually stopping "；
3) measure in real time: display module shows OBSPL curve and the list thereof of the time-domain diagram of sound pressure signal, mid frequency respectively 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, 8000Hz in the sound receiving room gathered in real time, A sound level, data update once every 1s.Display module also shows the air velocity in upstream line and the pressure loss of flow, acoustic filter.
4) process of data and storage: test DE device end, display module can show the measured values such as the sound deadening capacity of acoustic filter, the pressure loss, air velocity and flow, and storage and report generation module can store measurement result, and generate test report.Measurement result is as shown in table 1:
Table 1 air velocity and acoustic filter sound deadening capacity measurement result
Table 2: air flow rate, air velocity and acoustic filter pressure loss measurement result
Claims (9)
1. the measuring method of an acoustic filter sound deadening capacity and the pressure loss, it is characterised in that comprise the following steps:
1) signal emission module generates unit, digital-to-analogue conversion card, power amplifier and speaker by the digital signal being sequentially connected with and sends octave band noise or white noise signal in pipeline；
2) sound pressure signal acquisition module gathers blank pipe and the sound pressure signal installed under two operating modes of acoustic filter in sound receiving room respectively by the microphone being sequentially connected with, preamplifier, analog-to-digital conversion card and numeral signal receiving unit, and is passed along signal processing module；
3) gas velocity measurement module measures the air velocity signal in upstream line, and is passed along signal processing module；
4) gas flow pressure measurement module measures the static pressure and dynamic pressure of installing air-flow in upstream and downstream pipeline after acoustic filter, and is passed along signal processing module；
5) signal processing module calculates acoustic filter octave band sound deadening capacity and A weighted sound deadening capacity according to blank pipe and the sound pressure signal installed under two operating modes of acoustic filter in sound receiving room, the pressure loss according to the static pressure of air-flow in upstream and downstream pipeline and dynamic pressure calculation acoustic filter, according to the air velocity in upstream line and pipeline section areal calculation flow, and it is passed along display module, storage and report generation module；
6) parameter, sound deadening capacity, the pressure loss and flow in the middle of display module display；
7) storage and report generation module stores measurement data, sound deadening capacity, the pressure loss and volume computation, and generate test report.
2. the measuring method of a kind of acoustic filter sound deadening capacity according to claim 1 and the pressure loss, it is characterized in that, the running parameter of described signal emission module includes acoustical signal transmission channel, signal amplitude, transmitting signal duration, noise signal type, each band signal amplitude weighting value；
Described noise signal type includes: octave band noise signal and white noise signal.
3. the measuring method of a kind of acoustic filter sound deadening capacity according to claim 1 and the pressure loss, it is characterised in that the running parameter of described sound pressure signal acquisition module includes signal sampling channel, signal sampling frequency, brush screen cycle and signal averaging duration；
The running parameter of described gas velocity measurement module includes signal sampling channel, signal sampling frequency and signal averaging duration；
The running parameter of described gas flow pressure measurement module includes signal sampling channel, signal sampling frequency and signal averaging duration.
4. the measuring method of a kind of acoustic filter sound deadening capacity according to claim 1 and the pressure loss, it is characterised in that octave band sound deadening capacity and A weighted sound deadening capacity, the pressure loss and the flow rate calculation of described acoustic filter concretely comprise the following steps:
1) arranging signal emission module and the running parameter of acoustic pressure signal acquisition module, launch octave band noise or white noise in pipeline, each OBSPL measured in blank pipe situation in sound receiving room is designated as Lp0, A-weighted sound level is designated as Lp0A, measure each OBSPL installed in acoustic filter situation in sound receiving room and be designated as Lp1, A-weighted sound level is designated as Lp1A, unit is dB；
2) arranging the running parameter of gas velocity measurement module, the air velocity measured in upstream line is designated as vu, unit is m/s；
3) arranging the running parameter of gas flow pressure measurement module, after measuring installation acoustic filter, in upstream line, the dynamic pressure of air-flow is designated as pvu, static pressure is designated as psu, in downstream line, the dynamic pressure of air-flow is designated as pvd, and static pressure is designated as psd, unit is Pa；
4) signal processing module utilizes each octave band sound deadening capacity that blank pipe and the OBSPL installed under two operating modes of acoustic filter in sound receiving room and A-weighted sound level calculate acoustic filter to be designated as D, and unit is dB:
D=Lp0—Lp1；
A weighted sound deadening capacity is designated as DA, unit is dBA:
DA=Lp0A—Lp1A；
Being designated as Δ p according to the static pressure of air-flow in upstream and downstream pipeline and the pressure loss of dynamic pressure calculation acoustic filter, unit is Pa:
Δ p=(pvu+psu)—(pvd+psd)；
When acoustic filter two ends pipeline section area is identical, the pressure loss is calculated by following formula:
Δ p=psu—psd；
According to the air velocity v in upstream lineuBeing designated as U with pipeline section area S calculated flow rate, unit is m3/ s:
U=vu*S。
5. the measurement apparatus of the measuring method adopting acoustic filter sound deadening capacity as claimed in claim 1 and the pressure loss, it is characterized in that, including 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, is responsible for acoustic pressure, the Real-time Collection of airflow signal, process, display, storage and test report and generates.
6. measurement apparatus according to claim 5, it is characterised in that described signal emission module generates unit, digital-to-analogue conversion card, power amplifier and speaker by the digital signal being sequentially connected with and sends octave band noise or white noise signal in pipeline；Described digital signal generates unit and produces octave band or white noise signal by LabVIEW programming, digital-to-analogue conversion card convert digital signals into analogue signal, feed-in speaker after being amplified by power amplifier.
7. measurement apparatus according to claim 5, it is characterised in that described pipeline includes sound source and to acoustic filter or substitutes the upstream line between pipe, and acoustic filter or substitute pipe to the downstream line between sound receiving room.
8. measurement apparatus according to claim 5, it is characterised in that described display module includes 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, the sound pressure level curve of the octave band of frequency and list thereof 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, the pressure loss of described pressure loss display unit display acoustic filter, the described air flow rate in flow quantity display unit display upstream line.
9. measurement apparatus according to claim 5, it is characterized in that, described storage and report generation module include sound pressure level memory element, sound deadening capacity memory element, pressure loss memory element, flow memory element, test information compiling unit, test report generation unit, test report memory element, test report print unit；
Wherein, described sound pressure level memory element stores with 63Hz, 125Hz, 250Hz, 500Hz, 1000Hz, 2000Hz, 4000Hz, the OBSPL of frequency and A-weighted sound level centered by 8000Hz, described sound deadening capacity memory element stores 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 memory element storage pressure loss, the air velocity of described flow memory element storage upstream line and flow, described test information compiling unit editor tests information, described test report generates unit and generates test report, described test report memory element storage test report, described test report print unit printing test report.
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| 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 |
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