CN108194841A - One kind has source calibration formula water supply line leakage related detecting method and device - Google Patents
One kind has source calibration formula water supply line leakage related detecting method and device Download PDFInfo
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- CN108194841A CN108194841A CN201711387311.8A CN201711387311A CN108194841A CN 108194841 A CN108194841 A CN 108194841A CN 201711387311 A CN201711387311 A CN 201711387311A CN 108194841 A CN108194841 A CN 108194841A
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- vibration
- water supply
- supply line
- signal
- measuring sensor
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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
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, the leak point positioning error caused by velocity of wave parameter setting is improper can be reduced；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 of instrument can also be effectively grasped 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 source calibration formula water supply line leakage correlation
Detection method and device.
Background technology
Pipe leakage coherent detection instrument is the leakage noise propagation characteristic in the duct using leakage point, using cross-correlation method
The delay inequality that leakage spot noise reaches sensor is measured, leakage point is positioned with this.This quasi-instrument needs are known in advance
The spread speed of leakage noise sound wave in the duct, and acoustic wave propagation velocity by tubing, internal diameter, wall thickness of 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 also have 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, to propagating speed
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 of there is no enough priori and data to underground piping, in face of the complicated state of underground water supply pipelines, have no way of
Know the concrete condition of embedded underground pipeline, had difficulties in practical operation using the modified method of preset parameter.
Invention content
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 puts, 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, measure the array element of vibration-measuring sensor array
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；
It measures acoustic signals and reaches time difference between vibration-measuring sensor array element, then with array element spacing divided by time difference, obtain
To spread speed of the sound wave in water supply line；
Energy converter is controlled to stop transmitting acoustic signals, the noise on water supply line is measured using vibration-measuring sensor array synchronization
The noise signal received on two of which vibration-measuring sensor is sought time delay by signal by cross-power spectrum method, obtains leakage noise letter
Number reach two vibration-measuring sensors delay inequality τ；
According to spread speed of the sound wave in water supply line and the delay inequality τ of two vibration-measuring sensors, 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 tube wall, valve or the fire-fighting of water supply line to be measured
On bolt.
A preferably, vibration-measuring sensor of the installation site of the energy converter in vibration-measuring sensor array.
Preferably, the array element spacing of vibration-measuring sensor array is measured using tape measure or Optical Range Instrumentation.
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 is stopped, receive what vibration sensor array synchronization measured
Noise signal on water supply line；And when the noise signal received on two of which vibration-measuring sensor is asked by cross-power spectrum method
Prolong, obtain the delay inequality τ that noise signal reaches two vibration-measuring sensors；
According to spread speed of the sound wave in water supply line and the delay inequality τ of two vibration-measuring sensors, obtain 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.
6th, 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-measuring sensor is passed for the vibration measurement of piezoelectric type, condenser type or magneto-electric sensitive structure principle
Sensor.
Preferably, the signal conditioning circuit therefore the electric signal that vibration-measuring sensor generates is carried out impedance matching,
After amplification, filtering process, it is reconverted into digital signal.
A kind of self checking method for having source calibration formula water supply line leakage related detection device：
It is D to measure the distance between two vibration-measuring sensors in vibration-measuring sensor array, energy converter to two vibration measurings biographies
The distance between sensor is respectively L1And L2；
The signal generated with signal source drives transmitting transducer after the amplification of power amplifier, and excitation water supply line shakes
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, data acquisition card is transferred to, 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, obtain the delay inequality τ that leakage noise signal reaches two vibration-measuring sensors；
According to spread speed of the sound wave in water supply line and the delay inequality τ of two vibration-measuring sensors, 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 present invention has the advantages that：
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 of instrument can also be effectively grasped in daily maintenance by this self test mode, is reached
The effect maintained easily.
Description of the drawings
Fig. 1 has source calibration formula water supply line to leak related detection device schematic diagram；
Fig. 2 is the detector of the present invention to water supply line leak point positioning schematic diagram；
Fig. 3 is the self checking method schematic diagram of the present invention.
Specific embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
As shown in Figure 1, it is 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
The compositions such as truck, industrial control computer.
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 drive 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
Device emits the acoustic signals of high-energy.
Energy converter is adjacent to by peripheral equipments such as clips on water supply line, the acoustic signals excitation feed pipe of transmitting
Road generates sound wave in water supply line and is transmitted to distal end；
Vibration-measuring sensor array, signal conditioning circuit, wireless signal transmission system, data acquisition card, Industry Control calculate
Machine etc. forms the receiving system of coherent detection instrument, and vibration-measuring sensor array is by two or more vibration-measuring sensor structures
Into, can be the sensitive structures principle such as piezoelectric type, condenser type, magneto-electric vibration measurement sensor, it be 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.
The acoustic signals that are transmitted in vibration-measuring sensor array received to water supply line are simultaneously converted into electric signal, are input to signal
Modulate circuit after the effects that impedance matching of signal conditioning circuit, amplification, filtering, analog/digital conversion, is 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, when having source calibration formula water supply line leakage related detecting method to leak point positioning of the present invention, point
For two main process：
On the one hand, for the practical spread speed for measuring sound wave in water supply line, electric signal is changed into acoustical signal and is swashed
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 during position, and the distance between vibration-measuring sensor is known, is 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 powered for power amplifier and signal source, 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 excitation water supply line generates vibration, sound wave
Signal is just transmitted 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. form pipe leakage coherent detection instrument.Battery pack for signal conditioning circuit,
Wireless signal transmission system is powered, and vibration-measuring sensor array perceives the acoustic signals transmitted on water supply line, respectively believes 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
After changing, analog-signal transitions are inputted into wireless signal transmission system for digital signal, wireless signal transmission system completes multichannel number
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
High-power sound source measures spread speed v of the 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 that vibration-measuring sensor array perceives, when, there are during leakage point, leakage point sprays on water supply line
With tube wall and the air of surrounding friction, vibration occur for the flow gone out, and the leakage noise generated in certain frequency range (is concentrated mainly on
In 8kHz~12kHz), the vibration-measuring sensor array that leakage noise is installed on water supply line, which perceives, to be received, and 2 vibration measurings are passed
Received signal seeks time delay by Mutual spectrum on sensor, can obtain the time delay that leakage noise signal reaches 2 vibration-measuring sensors
Poor τ.
The theoretical foundation that Mutual spectrum measures 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 is：
The Fourier transform of y (t) is：
The crosspower spectrum of x (t) and y (t) is
Z (f)=X*(f) Y (f)=| X (f) |2ej2πfτ
Easily learn that the phase angle of 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 of 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 Figure 3：
System can install vibration-measuring sensor battle array in self-test and routine maintenance procedure on one section of exposed water supply line
Row 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 respectively L for the distance between D, transmitting transducer to this 2 vibration-measuring sensors1And L2。
The signal generated with signal source drives transmitting transducer after the amplification of power amplifier, and excitation water supply line shakes
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, data acquisition card is transferred to, data acquisition card completes multichannel
The synchronous acquisition of signal, and industrial control computer is transferred to, when industrial control computer completes cross-spectrum correlation measurement signal
Prolong, simulated leakage o'clock is calculated to the distance of 2 vibration-measuring sensors, with L1And L2Compared to pair, with regard to measurement and positioning error can be obtained,
So as to grasp the state of the art of system and performance, facilitate daily maintaining.
In conclusion the foregoing is merely a prefered embodiment of the invention, it is 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 the present invention's
Within protection domain.
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；
It measures acoustic signals and reaches time difference between vibration-measuring sensor array element, then with array element spacing divided by time difference, obtain sound
Spread speed of the wave in water supply line；
Energy converter is controlled to stop transmitting acoustic signals, the noise measured using vibration-measuring sensor array synchronization on water supply line is believed
Number, the noise signal received on two of which vibration-measuring sensor is sought into time delay by cross-power spectrum method, obtains leakage noise signal
Reach the delay inequality τ of two vibration-measuring sensors；
According to spread speed of the sound wave in water supply line and the delay inequality τ of two vibration-measuring sensors, leak point is obtained to 2 surveys
The range difference of vibration 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
Complete the positioning to leak point.
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 uses
Tape measure or Optical Range Instrumentation measure the array element spacing of 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, for perceiving what is transmitted on water supply line
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 is stopped, the water supply that vibration sensor array synchronization measures is received
Noise signal on pipeline；And the noise signal received on two of which vibration-measuring sensor is sought into time delay by cross-power spectrum method,
Obtain the delay inequality τ that noise signal reaches two vibration-measuring sensors；
According to spread speed of the sound wave in water supply line and the delay inequality τ of two vibration-measuring sensors, leak point is obtained to two
The range difference of 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
Complete the positioning to leak point.
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 process 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 in that：
It is D to measure the distance between two vibration-measuring sensors in vibration-measuring sensor array, energy converter to two vibration-measuring sensors
The distance between be respectively L1And L2；
The signal generated with signal source drives transmitting transducer, excitation water supply line vibration production after the amplification of power amplifier
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 modulate circuit, by wireless signal transmission system, data acquisition card is transferred to, 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；
According to spread speed of the sound wave in water supply line and the delay inequality τ of two vibration-measuring sensors, leak point is obtained to 2 surveys
The range difference of vibration 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.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110393883A (en) * | 2019-08-28 | 2019-11-01 | 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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| 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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