CN108194841B - One kind having source calibration formula water supply line leakage related detecting method and device - Google Patents
One kind having source calibration formula water supply line leakage related detecting method and device Download PDFInfo
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- CN108194841B CN108194841B CN201711387311.8A CN201711387311A CN108194841B CN 108194841 B CN108194841 B CN 108194841B CN 201711387311 A CN201711387311 A CN 201711387311A CN 108194841 B CN108194841 B CN 108194841B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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Abstract
The invention discloses one kind source calibration formula water supply line leakage related detecting method and device, spread speed of the field survey sound wave in pipe under test, the velocity of wave of actual measurement is introduced into the location Calculation of leakage point coherent detection instrument, can reduce because velocity of wave parameter setting it is improper caused by leak point positioning error；Active calibrating installation in the system can be used for self detection of pipe leakage coherent detection instrument, so that it may obtain system position error.Therefore, the state performance that can also effectively grasp instrument in daily maintenance by this self test mode, achievees the effect that maintain easily.
Description
Technical field
The invention belongs to Discussion on Pipe Leakage Detection Technology fields, and in particular to one kind has the leakage of source calibration formula water supply line related
Detection method and device.
Background technique
Pipe leakage coherent detection instrument is the leakage noise propagation characteristic in the duct using leakage point, using cross-correlation method
Measurement leakage spot noise reaches the delay inequality of sensor, is positioned with this to leakage point.This quasi-instrument needs are known in advance
The spread speed of leakage noise sound wave in the duct, and the tubing, internal diameter, wall thickness of acoustic wave propagation velocity by water supply line etc. because
The influence of element, the otherness of spread speed is very big in different pipelines, thus leads to the problem of positioning measurement error；The country is common
Water supply line source than wide, in addition to steel pipe, cast iron pipe, zinc-iron pipe are there are also polyethylene, pvc pipe etc., sound wave is in difference
Spread speed in type of conduits has differences, and coherent detection instrument is directly related with the velocity of sound for the location algorithm of leakage point
's.In conventional method, by manual intervention, velocity of wave parameter is set previously according to the difference of pipeline transmission characteristic, it is fast to propagating
Degree, which is modified, can reduce position error；But some water supply lines since the embedded time is longer, lose by construction information,
In the case where there is no enough priori knowledges and data to underground piping, in face of the complicated state of underground water supply pipelines, have no way of
The concrete condition for knowing embedded underground pipeline is had difficulties in actual operation using the modified method of preset parameter.
Summary of the invention
In view of this, the object of the present invention is to provide one kind source calibration formula water supply line leakage related detecting method and dress
It sets, the position error of water supply line leakage coherent detection instrument can be reduced, and achieve the effect that facilitate routine testing to safeguard, it can be with
Realize that self is detected.
One kind has source calibration formula water supply line to leak related detecting method,
Energy converter and vibration-measuring sensor array are mounted on water supply line to be measured, the array element of vibration-measuring sensor array is measured
Spacing；
Acoustic signals are emitted using energy converter, acoustic signals are transmitted along water supply line, each array element in vibration-measuring sensor array
Receive acoustic signals；
The time difference between acoustic signals arrival vibration-measuring sensor array element is measured, then is obtained with array element spacing divided by the time difference
To spread speed of the sound wave in water supply line；
It controls energy converter and stops transmitting acoustic signals, using the noise on vibration-measuring sensor array synchronization measurement water supply line
Noise signal received on two of them vibration-measuring sensor is sought time delay by cross-power spectrum method by signal, obtains leakage noise letter
Number reach two vibration-measuring sensors delay inequality τ；
According to the delay inequality τ of spread speed and two vibration-measuring sensor of the sound wave in water supply line, leak point is obtained to 2
The range difference of a vibration-measuring sensor distance；
Further according to the distance between two vibration-measuring sensors, leak point is obtained respectively to the distance of two vibration-measuring sensors,
Thus the positioning to leak point is completed.
Preferably, the energy converter and vibration-measuring sensor array are mounted on the tube wall, valve or fire-fighting of water supply line to be measured
On bolt.
Preferably, a vibration-measuring sensor of the installation site of the energy converter in vibration-measuring sensor array.
Preferably, using the array element spacing of tape measure or Optical Range Instrumentation measurement vibration-measuring sensor array.
One kind have source calibration formula water supply line leak related detection device, including energy converter, power amplifier, signal source,
Battery pack, vibration-measuring sensor array, signal conditioning circuit, wireless signal transmission system, data acquisition card, Industry Control calculate
Machine；
After the amplification of power amplifier, voltage and current is enhanced the electric signal that the signal source generates, driving
Energy converter emits acoustic signals；
The vibration-measuring sensor array is made of more than two vibration-measuring sensor array elements, is uploaded for perceiving water supply line
Defeated acoustic signals, and it is converted into electric signal；
The signal conditioning circuit is changed into digital signal to the electric signal that vibration-measuring sensor generates and is input to wirelessly
Signal transmission system；
Digital signal input signal capture card, data acquisition card are completed multi-channel digital by the wireless signal transmission system
The acquisition of signal, and enter data into industrial control computer；
The industrial control computer is used for: after energy converter stops working, receiving the measurement of vibration sensor array synchronization
Noise signal on water supply line；And when noise signal received on two of them vibration-measuring sensor is asked by cross-power spectrum method
Prolong, obtains the delay inequality τ that noise signal reaches two vibration-measuring sensors；
According to the delay inequality τ of spread speed and two vibration-measuring sensor of the sound wave in water supply line, obtains leak point and arrive
The range difference of two vibration-measuring sensor distances；
Further according to the distance between two vibration-measuring sensors, leak point is obtained respectively to the distance of two vibration-measuring sensors,
Thus the positioning to leak point is completed.
6, one kind as claimed in claim 5 has source calibration formula water supply line to leak related detection device, which is characterized in that
The energy converter is piezoelectric type or magneto-electric electro-acoustic conversion device.
Preferably, the vibration measurement that the vibration-measuring sensor is piezoelectric type, condenser type or magneto-electric sensitive structure principle passes
Sensor.
Preferably, the electric signal that the signal conditioning circuit generates vibration-measuring sensor thus carry out impedance matching,
After amplification, filtering processing, it is reconverted into digital signal.
A kind of self checking method having source calibration formula water supply line leakage related detection device:
Measuring the distance between two vibration-measuring sensors in vibration-measuring sensor array is D, and energy converter is passed to two vibration measurings
The distance between sensor is respectively L1And L2；
Transmitting transducer, excitation water supply line vibration are driven after the amplification of power amplifier with the signal that signal source generates
Movable property gives birth to acoustic signals, as simulation pipe leakage noise；Vibration-measuring sensor perceives the acoustical signal propagated along water supply line, warp
After crossing signal conditioning circuit processing, by wireless signal transmission system, it is transferred to data acquisition card, data acquisition card completes multichannel
The synchronous acquisition of signal, and it is transferred to industrial control computer；When industrial control computer is according to cross-spectrum correlation measurement signal
Prolong, obtains the delay inequality τ that leakage noise signal reaches two vibration-measuring sensors；
According to the delay inequality τ of spread speed and two vibration-measuring sensor of the sound wave in water supply line, leak point is obtained to 2
The range difference of a vibration-measuring sensor distance；
According to the distance between two vibration-measuring sensors D, leak point is obtained respectively to the distance L of two vibration-measuring sensors1′
And L2', then respectively with L1And L2Compared to pair, measurement and positioning error is thus obtained.
The invention has the following beneficial effects:
The present invention is using the detection method and device for having source calibration, propagation speed of the field survey sound wave in pipe under test
The velocity of wave of actual measurement, is introduced into the location Calculation of leakage point coherent detection instrument, can reduce and draw because velocity of wave parameter setting is improper by degree
The leak point positioning error risen.
Active calibrating installation in the system can be used for self detection of pipe leakage coherent detection instrument, so that it may obtain
System position error.Therefore, the state performance that can also effectively grasp instrument in daily maintenance by this self test mode, reaches
The effect maintained easily.
Detailed description of the invention
Fig. 1 has source calibration formula water supply line to leak related detection device schematic diagram；
Fig. 2 is detector of the invention to water supply line leak point positioning schematic diagram；
Fig. 3 is self checking method schematic diagram of the invention.
Specific embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
As shown in Fig. 1, of the invention to there is source calibration formula water supply line to leak related detection device, mainly by energy converter,
Power amplifier, signal source, battery pack, vibration-measuring sensor array, signal conditioning circuit, wireless signal transmission system, signal are adopted
Truck, industrial control computer etc. are constituted.
Wherein, the compositions such as energy converter, power amplifier, signal source, battery pack have the emission sound source of source calibration, and energy converter is
The electric energy of driving signal can be filled the mechanical energy for being changed to sound or vibration by piezoelectric type or magneto-electric electricity-sound converter device.
After the amplification of power amplifier, voltage and current is enhanced the electric signal that signal source generates, and drives transducing
The acoustic signals of device transmitting high-energy.
Energy converter is adjacent on water supply line by peripheral equipments such as clips, and the acoustic signals of transmitting motivate water supplying pipe
Road generates sound wave in water supply line and transmits to distal end；
Vibration-measuring sensor array, signal conditioning circuit, wireless signal transmission system, data acquisition card, Industry Control calculate
Machine etc. constitutes the receiving system of coherent detection instrument, and vibration-measuring sensor array is by two or more vibration-measuring sensor structures
At can be the vibration measurement sensor of the sensitive structures principle such as piezoelectric type, condenser type, magneto-electric, it is mounted on water supply line
On, the acoustic signals transmitted on water supply line can be perceived, responsive bandwidth covers the frequency range of water supply line leakage noise signal.
Acoustic signals that vibration-measuring sensor array received is transmitted into water supply line are simultaneously converted into electric signal, are input to signal
Conditioning circuit, by the impedance matching of signal conditioning circuit, amplification, filtering, the analog/digital conversion the effects of after, be changed into digital letter
Number it is input to wireless signal transmission system.
Wireless signal transmission system completes the functions such as synchronization, modulation /demodulation, the wireless transmission of digital signal, by digital signal
Input signal capture card, data acquisition card complete the acquisition of multichannel digital signal, and enter data into Industry Control calculating
It is handled in machine.
As shown in Fig. 2, it is of the invention when having source calibration formula water supply line leakage related detecting method to leak point positioning, point
For two main process:
On the one hand, electric signal is changed into acoustical signal and swashed by the spread speed for actual measurement sound wave in water supply line
It encourages water supply line generation vibration distally to propagate, passes through the vibration-measuring sensor being mounted on pipeline and measure the different nodes of sound wave arrival
Time difference when position, and the distance between vibration-measuring sensor be it is known, calculated according to known distance and wave up to the time difference
Spread speed of the acoustic signals on water supply line；
Battery pack is that power amplifier and signal source are powered, and the audio electrical signal that signal source generates is by power amplifier
After amplification, driving transmitting transducer generates electricity-sound switching emission acoustical signal, and acoustical signal motivates water supply line to generate vibration, sound wave
Signal just transmits along water supply line to distal end；Battery pack, vibration-measuring sensor array, signal conditioning circuit, wireless signal transmission
System, data acquisition card, industrial control computer etc. constitute pipe leakage coherent detection instrument.Battery pack be signal conditioning circuit,
Wireless signal transmission system power supply, vibration-measuring sensor array perceive the acoustic signals transmitted on water supply line, respectively believe sound
Number it is changed into after electric signal and is input to signal conditioning circuit, signal conditioning circuit completes impedance matching, amplification, filtering, analog/digital turn
It is that digital signal inputs wireless signal transmission system by analog-signal transitions, wireless signal transmission system completes multichannel number after changing
The synchronous transfer of word signal, by digital data transmission to data acquisition card, data acquisition card is by multi-path digital signal synchronous collection
After be transferred to industrial control computer, the processing and operation of the complete pair signals of industrial control computer.
When coherent detection instrument is for pipe leakage point detection positioning, first method as described above is by artificially emitting
Spread speed v of the high-power sound source measurement sound wave in water supply line, then stops the transmitting of artificial sound source, starts synchronous acquisition
The acoustical signal propagated on the water supply line of vibration-measuring sensor array perception, when, there are when leakage point, leakage point sprays on water supply line
Friction, vibration occur for the air of water flow and tube wall and surrounding out, and the leakage noise generated in certain frequency range (is concentrated mainly on
In 8kHz~12kHz), leakage noise is installed in the perception of the vibration-measuring sensor array on water supply line and receives, and 2 vibration measurings are passed
Received signal seeks time delay by Mutual spectrum on sensor, and available leakage noise signal reaches the time delay of 2 vibration-measuring sensors
Poor τ.
The theoretical basis of Mutual spectrum measurement time delay is that the Delay of 2 vibration-measuring sensors reception signals is present in cross-power
Among spectrum.If the signal that two sensors receive is x (t) and y (t)=x (t+ τ), τ is relative time delay here.Due to x (t)
It is to have rule signal, then its Fourier transform are as follows:
The Fourier transform of y (t) are as follows:
The crosspower spectrum of x (t) and y (t) is
Z (f)=X*(f) Y (f)=| X (f) |2ej2πfτ
The phase angle for being easy to learn Z (f) is
Then:
If the distance of leakage point to 2 sensors is respectively L1And L2, the spacing of sensor is known as D.Leak Acoustic Wave Propagation
Speed v measured by front.The time difference for the leakage signal that 2 sensors receive isFront receives 2
After signal acquires time delay value τ with cross-correlation method, according to D=L1+L2Obtain linear equation in two unknowns group:
It solves this equation group and obtains pipe leakage point respectively to the distance L of two vibration-measuring sensors1And L2
3) as shown in Fig. 3:
System can install vibration-measuring sensor battle array in self-test and routine maintenance procedure on one section of exposed water supply line
Column and transmitting transducer (spread speed of sound wave can be measured first with the method that front describes on water supply line), 2 vibration measuring sensings
The distance between device is D, and the distance between transmitting transducer to this 2 vibration-measuring sensors is respectively L1And L2。
Transmitting transducer, excitation water supply line vibration are driven after the amplification of power amplifier with the signal that signal source generates
Movable property gives birth to acoustic signals, as simulation pipe leakage noise；Vibration-measuring sensor perceives the acoustical signal propagated along water supply line, warp
After crossing signal conditioning circuit processing, by wireless signal transmission system, it is transferred to data acquisition card, data acquisition card completes multichannel
The synchronous acquisition of signal, and it is transferred to industrial control computer, when industrial control computer completes cross-spectrum correlation measurement signal
Prolong, calculate simulated leakage o'clock to 2 vibration-measuring sensors distance, with L1And L2Compared to pair, measurement and positioning error can be obtained,
To grasp the state of the art and performance of system, facilitate daily maintenance.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (9)
1. one kind has source calibration formula water supply line to leak related detecting method, it is characterised in that:
Energy converter and vibration-measuring sensor array are mounted on water supply line to be measured, between the array element for measuring vibration-measuring sensor array
Away from；
Acoustic signals are emitted using energy converter, acoustic signals are transmitted along water supply line, and each array element receives in vibration-measuring sensor array
Acoustic signals；
The time difference between acoustic signals arrival vibration-measuring sensor array element is measured, then obtains sound divided by the time difference with array element spacing
Spread speed v of the wave in water supply line；
It controls energy converter and stops transmitting acoustic signals, believed using the noise on vibration-measuring sensor array synchronization measurement water supply line
Number, noise signal received on two of them vibration-measuring sensor is sought into time delay by cross-power spectrum method, obtains leakage noise signal
The delay inequality τ of two vibration-measuring sensors is reached, specifically:
If the noise signal that 2 vibration-measuring sensors receive is respectively x (t) and y (t)=x (t+ τ), then the Fourier of the two becomes
It is changed to:
The crosspower spectrum of x (t) and y (t) are as follows:
Z (f)=X*(f) Y (f)=| X (f) |2ej2πfτ
The phase angle of Z (f) are as follows:
Then:
According to the delay inequality of spread speed of the sound wave in water supply line and two vibration-measuring sensors and two vibration-measuring sensors it
Between distance D, obtain leak point respectively to the distance of two vibration-measuring sensors, thus complete the positioning to leak point；Wherein, it lets out
Leak source is respectively to the distance L of 2 vibration-measuring sensors1And L2It is obtained by solving following linear equation in two unknowns group:
2. one kind as described in claim 1 has source calibration formula water supply line to leak related detecting method, which is characterized in that described
Energy converter and vibration-measuring sensor array are mounted on the tube wall, valve or fire hydrant of water supply line to be measured.
3. one kind as described in claim 1 has source calibration formula water supply line to leak related detecting method, which is characterized in that described
A vibration-measuring sensor of the installation site of energy converter in vibration-measuring sensor array.
4. one kind as described in claim 1 has source calibration formula water supply line to leak related detecting method, which is characterized in that use
The array element spacing of tape measure or Optical Range Instrumentation measurement vibration-measuring sensor array.
5. one kind has source calibration formula water supply line to leak related detection device, which is characterized in that including energy converter, power amplification
Device, signal source, battery pack, vibration-measuring sensor array, signal conditioning circuit, wireless signal transmission system, data acquisition card, industry
Control computer；
After the amplification of power amplifier, voltage and current is enhanced the electric signal that the signal source generates, and drives transducing
Device emits acoustic signals；
The vibration-measuring sensor array is made of more than two vibration-measuring sensor array elements, transmits on water supply line for perceiving
Acoustic signals, and it is converted into electric signal；
The signal conditioning circuit is changed into digital signal to the electric signal that vibration-measuring sensor generates and is input to wireless signal
Transmission system；
Digital signal input signal capture card, data acquisition card are completed multichannel digital signal by the wireless signal transmission system
Acquisition, and enter data into industrial control computer；
The industrial control computer is used for: after energy converter stops working, receiving the water supply of vibration sensor array synchronization measurement
Noise signal on pipeline；And noise signal received on two of them vibration-measuring sensor is sought into time delay by cross-power spectrum method,
The delay inequality τ that noise signal reaches two vibration-measuring sensors is obtained, specifically:
If the noise signal that 2 vibration-measuring sensors receive is respectively x (t) and y (t)=x (t+ τ), then the Fourier of the two becomes
It is changed to:
The crosspower spectrum of x (t) and y (t) are as follows:
Z (f)=X*(f) Y (f)=| X (f) |2ej2πfτ
The phase angle of Z (f) are as follows:
Then:
According to the delay inequality of spread speed of the sound wave in water supply line and two vibration-measuring sensors and two vibration-measuring sensors it
Between distance D, obtain leak point respectively to the distance of two vibration-measuring sensors, thus complete the positioning to leak point；Wherein, it lets out
Leak source is respectively to the distance L of 2 vibration-measuring sensors1And L2It is obtained by solving following linear equation in two unknowns group:
6. one kind as claimed in claim 5 has source calibration formula water supply line to leak related detection device, which is characterized in that described
Energy converter is piezoelectric type or magneto-electric electro-acoustic conversion device.
7. one kind as claimed in claim 5 has source calibration formula water supply line to leak related detection device, which is characterized in that described
Vibration-measuring sensor is the vibration measurement sensor of piezoelectric type, condenser type or magneto-electric sensitive structure principle.
8. one kind as claimed in claim 5 has source calibration formula water supply line to leak related detection device, which is characterized in that described
Therefore signal conditioning circuit carries out impedance matching, amplification, filtering processing to the electric signal that vibration-measuring sensor generates after, then turn
It is changed to digital signal.
9. it is a kind of for there is the self checking method of source calibration formula water supply line leakage related detection device as claimed in claim 5,
It is characterized by:
Measuring the distance between two vibration-measuring sensors in vibration-measuring sensor array is D, energy converter to two vibration-measuring sensors
The distance between be respectively L1' and L2′；
Transmitting transducer is driven after the amplification of power amplifier with the signal that signal source generates, excitation water supply line vibration produces
Raw acoustic signals, as simulation pipe leakage noise；Vibration-measuring sensor perceives the acoustical signal propagated along water supply line, by letter
After the processing of number conditioning circuit, by wireless signal transmission system, it is transferred to data acquisition card, data acquisition card completes multiple signals
Synchronous acquisition, and be transferred to industrial control computer；Industrial control computer is obtained according to cross-spectrum correlation measurement signal time delay
The delay inequality τ of two vibration-measuring sensors is reached to leakage noise signal, specifically:
If the noise signal that 2 vibration-measuring sensors receive is respectively x (t) and y (t)=x (t+ τ), then the Fourier of the two becomes
It is changed to:
The crosspower spectrum of x (t) and y (t) are as follows:
Z (f)=X*(f) Y (f)=| X (f) |2ej2πfτ
The phase angle of Z (f) are as follows:
Then:
According to the delay inequality τ and two vibration measuring sensings of spread speed v and two vibration-measuring sensor of the sound wave in water supply line
The distance between device D, by solving following linear equation in two unknowns group:
Leak point is obtained respectively to the distance L of two vibration-measuring sensors1And L2；Then again respectively with L1' and L2' compared to pair, thus
Obtain measurement and positioning error.
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| CN110220645A (en) * | 2019-07-10 | 2019-09-10 | 美钻深海能源科技研发（上海）有限公司 | Deepwater field production of hydrocarbons leaks leak detection sensitivities experimental technique |
| CN110393883B (en) * | 2019-08-28 | 2020-08-18 | 晋江市长胜电子科技有限公司 | Fire hydrant |
| CN111188999A (en) * | 2020-03-08 | 2020-05-22 | 中信建筑设计研究总院有限公司 | Water supply pipeline leakage detection method and system |
| CN111765390A (en) * | 2020-05-20 | 2020-10-13 | 吉林省百瑞生科技发展有限公司 | Pipeline leakage point positioning method and system based on acoustic emission response |
| CN114383785A (en) * | 2021-12-31 | 2022-04-22 | 北京无线电计量测试研究所 | Correlation instrument and pipeline water leakage point detection method |
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| CN1004444B (en) * | 1986-09-05 | 1989-06-07 | 中国科学院东海研究站 | Acoustic device for detecting water accumulation position of gas pipeline |
| CN102242871B (en) * | 2011-07-07 | 2013-10-09 | 中国船舶重工集团公司第七○二研究所 | Acoustic emission source location method for deep-sea vehicle hydraulic pipeline leakage |
| CN103292160B (en) * | 2013-06-27 | 2015-11-18 | 陕西师范大学 | The ultrasonic detection device of pipe leakage and method |
| CN105181795A (en) * | 2015-07-16 | 2015-12-23 | 无锡市崇安区科技创业服务中心 | Submarine pipeline safety monitoring device |
| CN205620355U (en) * | 2015-12-30 | 2016-10-05 | 中国科学院金属研究所 | Integrated supersound guided wave and sound pulse technique's portable pipeline detector |
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