CN108662442B - The localization method and device of pipe leakage - Google Patents
The localization method and device of pipe leakage Download PDFInfo
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- CN108662442B CN108662442B CN201810478059.XA CN201810478059A CN108662442B CN 108662442 B CN108662442 B CN 108662442B CN 201810478059 A CN201810478059 A CN 201810478059A CN 108662442 B CN108662442 B CN 108662442B
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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 a kind of localization method of pipe leakage and devices, it is related to pipeline inspection technology field, main purpose is existing unintelligible for Small leak and the pressure signal failing edge inflection point simmered, it is larger to cause to fail to report higher and position error, and punches the problem of installation pressure sensor can bring danger using pipeline.It include: flow velocity signal, the velocity of sound signal for obtaining the ultrasonic velocity sensor for being separately mounted to pipeline first and last end, flow sensor acquisition；The leakage transient information at first and last end is calculated according to the flow velocity signal, the velocity of sound signal according to the leakage transient information propagation attenuation computation model pre-established；The fused head end information fusion signal of information is carried out according to the leakage transient information to the first and last end and final word fusion signal determines delay time, and calculates distance of the leakage point apart from pipeline head end ultrasonic sensor using preset leak point positioning formula.
Description
Technical field
The present invention relates to a kind of pipeline inspection technology fields, more particularly to the localization method and dress of a kind of pipe leakage
It sets.
Background technique
Pipeline transportation is one of the important way of liquid resource long distance transmission, during pipeline transportation, the leakage of pipeline
Situation then becomes influence and guarantees an important factor for liquid resource stablizes transmission.Wherein, in order to when pipe leakage occurs, can and
When carry out remedy, the important topic of pipe leakage being positioned to for research.
Although currently, the positioning that existing negative pressure wave method carries out pipe leakage can detect rapidly to be greater than 3% it is normal defeated
The leakage of amount, and leak point positioning is carried out using its time difference according to the inflection point time of first and last side pressure force signal failing edge, but
It is, it is unintelligible for Small leak and the pressure signal failing edge inflection point that simmers, it causes to fail to report higher and position error larger, and makes
Danger can be brought by punching installation pressure sensor with pipeline, influence the locating effect of pipe leakage.
Summary of the invention
In view of this, the present invention provides the localization method and device of a kind of pipe leakage, main purpose be it is existing for
Small leak and the pressure signal failing edge inflection point simmered are unintelligible, it is larger to cause to fail to report higher and position error, and use pipeline
The problem of punching installation pressure sensor can bring danger, influence the locating effect of pipe leakage.
According to the present invention on one side, a kind of localization method of pipe leakage is provided, comprising:
Obtain be separately mounted to pipeline first and last end ultrasonic velocity sensor, flow sensor acquisition flow velocity signal,
Velocity of sound signal, the flow velocity signal include the flow velocity signal of pipeline head end and the flow velocity signal of pipe end, the velocity of sound signal
The velocity of sound signal of velocity of sound signal and pipe end including pipeline head end；
Believed according to the leakage transient information propagation attenuation computation model pre-established according to the flow velocity signal, the velocity of sound
The leakage transient information at first and last end number is calculated, the leakage transient information propagation attenuation computation model is the movement according to pipeline
The transient information computation model at the pipeline first and last end that equation and continuity equation combination ultrasonic velocity attenuation characteristic are determined；
The fused head end information fusion signal of information and end are carried out according to the leakage transient information to the first and last end
Client information fusion signal determines delay time, and calculates leakage point apart from pipeline head end using preset leak point positioning formula
The distance of ultrasonic velocity sensor.
Further, ultrasonic velocity sensor, the flow sensor that the acquisition is separately mounted to pipeline first and last end are adopted
Before the flow velocity signal of collection, velocity of sound signal, the method also includes:
It is according to the Transient Flow in Pipeline equation that the equation of motion, continuity equation establish liquidWherein, v is flow velocity, and ρ is fluid density, and D is pipe
Road internal diameter, alpha levels axle clamp angle, λ are darcy hydraulic simulation experiment, and x is the axial distance along pipeline, and t is time, awFor suction wave
Velocity of wave, g are acceleration of gravity, acFor the velocity of sound in liquid, a0For the velocity of sound in liquid under one atmospheric pressure of room temperature, K is proportionality coefficient；
When ignoring elevation variation, then the node i at the j moment established according to gsin α=0 is along C+And C-Finite difference side
Journey is respectively Wherein, aci,jIndicate the ultrasonic acoustic at i-node j moment
Speed；vi,jIndicate the flow velocity at i-node j moment；
When Sudden Leakage point is the i-node j moment, and assume that j-1 moment pipeline fluid is in steady state condition, in j+1
The parameter for carving i+2 node remains unchanged, and is solved to obtain leakage transient information propagation attenuation calculating according to the finite difference equations
Model is
Wherein, the boundary condition of leakage point meetsFmFor the information of pipe end
Transition, Δ FmFor the increment of the information transition of pipe end, acmAnd vmThe respectively velocity of sound and flow velocity of pipe end, LxFor leakage
Point arrives the distance of pipeline first section, and Δ x is run of designing, Δ x=awΔ t, FsFor the information transition of pipeline head end, Δ FsFor pipe
The increment of the information transition of road head end, acsAnd vsThe respectively velocity of sound and flow velocity of pipeline head end, LxFor leakage point to pipeline first section
Distance, Fu-For the information transition before leakage point.
Further, the basis melts the leakage transient information progress fused head end information of information at the first and last end
Before conjunction signal and final word fusion signal determine delay time, the method also includes:
Using the corresponding relationship when pipeline leaks between the head end velocity of sound, flow and the end velocity of sound, flow to described
The leakage transient information at first and last end carries out information fusion, obtains the leakage transient information F of first and endsAnd FmRespectively Fs=acs-
Ka0ρawvs, Fm=acm+Ka0ρawvm。
Further, the basis melts the leakage transient information progress fused head end information of information at the first and last end
It closes signal and final word fusion signal determines delay time, and calculate leakage point using preset leak point positioning formula
Distance apart from pipeline head end ultrasonic velocity sensor includes:
Using wavelet analysis method respectively to the leakage transient information F of the fused head end of informationsAnd the leakage wink of end
Become information FmMutation time point is extracted, the mutation time is clicked through according to cross-correlation analysis method and pre-set time window
The rough time to peak search of row determined for the first delay time, and according to cross-correlation analysis method and pre-set time window pair
The mutation time point carries out accurate time to peak search and determined for the second delay time, by first delay time with it is described
The sum of second delay time is determined as delay time；
Utilize preset leak point positioning formulaLeakage point is calculated apart from pipeline head end ultrasonic velocity
The distance of sensor, wherein the tDFor delay time, L is duct length.
According to the present invention on one side, a kind of positioning device of pipe leakage is provided, comprising:
Acquiring unit is separately mounted to ultrasonic velocity sensor, the flow sensor at pipeline first and last end and adopts for obtaining
Flow velocity signal, the velocity of sound signal of collection, the flow velocity signal include the flow velocity signal of pipeline head end and the flow velocity signal of pipe end,
The velocity of sound signal includes the velocity of sound signal of pipeline head end and the velocity of sound signal of pipe end；
First computing unit, for according to the leakage transient information propagation attenuation computation model pre-established according to the stream
Fast signal, the velocity of sound signal calculate the leakage transient information at first and last end, and the leakage transient information propagation attenuation calculates mould
Type is the pipeline first and last end determined according to the equation of motion and continuity equation combination ultrasonic velocity attenuation characteristic of pipeline
Transient information computation model；
Second computing unit is believed for carrying out the fused head end of information according to the leakage transient information to the first and last end
Breath fusion signal and final word fusion signal determine delay time, and are calculated and let out using preset leak point positioning formula
Distance of the leak source apart from pipeline head end ultrasonic velocity sensor.
Further, described device further include:
First establishing unit, the Transient Flow in Pipeline equation for establishing liquid according to the equation of motion, continuity equation areWherein, v is flow velocity, and ρ is fluid density, and D is pipe
Road internal diameter, alpha levels axle clamp angle, λ are darcy hydraulic simulation experiment, and x is the axial distance along pipeline, and t is time, awFor suction wave
Velocity of wave, g are acceleration of gravity, acFor the velocity of sound in liquid, a0For the velocity of sound in liquid under one atmospheric pressure of room temperature, K is proportionality coefficient；
Second establishes unit, for when ignoring elevation variation, then the node i at the j moment established according to gsin α=0 to be along C+And C-Finite difference equations be respectively Wherein, aci,The ultrasonic acoustic at j expression i-node j moment
Speed；vi,jIndicate the flow velocity at i-node j moment；
Unit is solved, for being the i-node j moment when Sudden Leakage point, and assumes that j-1 moment pipeline fluid is in stable state
Operating condition is remained unchanged in the parameter of j+1 moment i+2 node, is solved to obtain leakage transient information according to the finite difference equations
Propagation attenuation computation model is Wherein, the boundary condition of leakage point meetsFmFor the information transition of pipe end, Δ FmFor the information of pipe end
The increment of transition, acmAnd vmThe respectively velocity of sound and flow velocity of pipe end, LxFor leakage point to the distance of pipeline first section, Δ x is
Run of designing, Δ x=awΔ t, FsFor the information transition of pipeline head end, Δ FsFor the increment of the information transition of pipeline head end, acs
And vsThe respectively velocity of sound and flow velocity of pipeline head end, LxFor leakage point to the distance of pipeline first section, Fu-For the information before leakage point
Transition.
Further, described device further include:
Integrated unit, for utilizing pair when pipeline leaks between the head end velocity of sound, flow and the end velocity of sound, flow
It should be related to and information fusion is carried out to the leakage transient information at the first and last end, obtain the leakage transient information F of first and endsAnd FmPoint
It Wei not Fs=acs-Ka0ρawvs, Fm=acm+Ka0ρawvm。
Further, second computing unit is specifically used for utilizing wavelet analysis method head fused to information respectively
The leakage transient information F at endsAnd the leakage transient information F of endmExtract mutation time point, according to cross-correlation analysis method and
Pre-set time window searches for the rough time to peak of mutation time point progress and determined for the first delay time, and according to
Cross-correlation analysis method and pre-set time window carry out accurate time to peak search to the mutation time point and determine the
The sum of first delay time and second delay time are determined as delay time by two delay times；It is let out using preset
Leak source ranging formulaCalculate distance of the leakage point apart from pipeline head end ultrasonic velocity sensor, wherein
The tDFor delay time, L is duct length.
According to another aspect of the invention, a kind of storage medium is provided, at least one is stored in the storage medium can
It executes instruction, the executable instruction makes processor execute the corresponding operation of localization method such as above-mentioned pipe leakage.
In accordance with a further aspect of the present invention, a kind of terminal is provided, comprising: processor, memory, communication interface and communication
Bus, the processor, the memory and the communication interface complete mutual communication by the communication bus；
For the memory for storing an at least executable instruction, it is above-mentioned that the executable instruction executes the processor
The corresponding operation of the localization method of pipe leakage.
By above-mentioned technical proposal, technical solution provided in an embodiment of the present invention is at least had the advantage that
The present invention provides a kind of localization method of pipe leakage and devices, obtain be separately mounted to pipeline first and last end first
Ultrasonic velocity sensor, flow sensor acquisition flow velocity signal, velocity of sound signal, the flow velocity signal includes pipeline head end
Flow velocity signal and pipe end flow velocity signal, the velocity of sound signal includes the velocity of sound signal and pipe end of pipeline head end
Velocity of sound signal；According to the leakage transient information propagation attenuation computation model pre-established according to the flow velocity signal, the velocity of sound
Signal calculates the leakage transient information at first and last end, and the leakage transient information propagation attenuation computation model is the fortune according to pipeline
The transient information at the pipeline first and last end that dynamic equation and continuity equation combination ultrasonic velocity attenuation characteristic are determined calculates mould
Type；The fused head end information fusion signal of information and final word are carried out according to the leakage transient information to the first and last end
Fusion signal determines delay time, and calculates leakage point apart from pipeline head end ultrasonic wave using preset leak point positioning formula
The distance of sonic sensor.With it is existing unintelligible for Small leak and the pressure signal failing edge inflection point simmered, cause to fail to report compared with
High and position error is larger, and can bring danger using pipeline punching installation pressure sensor, influences determining for pipe leakage
Position effect is compared, and the present invention implements the mechanism of transmission by ultrasonic velocity, is established the velocity of sound and is generated and propagation attenuation calculating mould
Type, and ultrasonic velocity and flow signal have been subjected to signal fused, enable information fusion signal more to burst signal and turns
Point can more accurately extract the time difference that pipeline first and last client information merges signal by improving cross-correlation analysis method, thus
The positioning accuracy of Small leak can be improved, Small leak point is fast and effeciently positioned, improves the efficiency of pipe leakage positioning.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 shows a kind of localization method flow chart of pipe leakage provided in an embodiment of the present invention；
Fig. 2 shows the generation of the velocity of sound at a kind of leakage point provided in an embodiment of the present invention and propagate schematic diagram；
Fig. 3 shows a kind of characteristic curve network schematic diagram provided in an embodiment of the present invention；
Fig. 4 shows the schematic diagram of pipeline first and last segment signal catastrophe point time difference provided in an embodiment of the present invention a kind of；
Fig. 5 shows a kind of pipeline first and last end provided in an embodiment of the present invention flow changing curve schematic diagram；
Fig. 6 shows a kind of pipeline first and last end ultrasonic velocity change curve schematic diagram provided in an embodiment of the present invention；
Fig. 7 shows a kind of pipeline first and last end pressure change curve schematic diagram provided in an embodiment of the present invention；
Fig. 8 shows a kind of pipeline head end information fusion signal schematic representation provided in an embodiment of the present invention；
Fig. 9 shows a kind of pipe end information fusion signal schematic representation provided in an embodiment of the present invention；
Figure 10 shows a kind of first time cross-correlation analysis schematic diagram provided in an embodiment of the present invention；
Figure 11 shows a kind of second of cross-correlation analysis schematic diagram provided in an embodiment of the present invention；
Figure 12 shows a kind of cross-correlation analysis schematic diagram of pipeline first and last end signal provided in an embodiment of the present invention；
Figure 13 is shown under a kind of different leakage rates provided in an embodiment of the present invention, and pipeline head end information merges signal contrast
Curve synoptic diagram；
Figure 14 is shown under a kind of different leakage rates provided in an embodiment of the present invention, and pipe end information merges signal contrast
Curve synoptic diagram；
Figure 15 shows a kind of positioning device structure schematic diagram of pipe leakage provided in an embodiment of the present invention；
Figure 16 shows the positioning device structure schematic diagram of another pipe leakage provided in an embodiment of the present invention；
Figure 17 shows a kind of terminal structure schematic diagrames provided in an embodiment of the present invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
The embodiment of the invention provides a kind of localization methods of pipe leakage, as shown in Figure 1, which comprises
101, the ultrasonic velocity sensor for being separately mounted to pipeline first and last end, the flow velocity letter of flow sensor acquisition are obtained
Number, velocity of sound signal.
Wherein, the flow velocity signal includes the flow velocity signal of pipeline head end and the flow velocity signal of pipe end, the velocity of sound
Signal includes the velocity of sound signal of pipeline head end and the velocity of sound signal of pipe end.It is small in order to accurately determine in the embodiment of the present invention
The leakage point of leakage rate is separately installed with ultrasonic velocity sensor, flow sensing in the head end of pipeline to be detected and end
Device, to acquire flow velocity signal, the velocity of sound signal of pipeline head end and end respectively.
It should be noted that in the present embodiment, the phenomenon that leakage point is burst, in order at the time of accurate description leakage point and
Node situation, if i-node j moment Sudden Leakage, and assume that j-1 moment pipeline fluid is in steady state condition, the velocity of sound at leakage point
Generation and propagate schematic diagram, as shown in Figure 2.
In addition, the data of acquisition be by acquiring data from NI data collection system DAQ-9184, what I/O fastener was selected
It is the NI-9208 Dynamic Data Acquiring fastener of NI company, 16 Channel Synchronous acquire, and sample rate is up to 500S/s, and resolution ratio is
24bit.Data sampling rate is 100HZ, and all experiments are in Intel Pentium processor (2.90GHz) and 6GB RAM
PC machine on use 2015 software of MATLAB R2014a and Labview.
102, according to the leakage transient information propagation attenuation computation model pre-established according to the flow velocity signal, the sound
Fast signal calculates the leakage transient information at first and last end.
Wherein, the leakage transient information propagation attenuation computation model is according to the equation of motion of pipeline and continuity side
The transient information computation model at the pipeline first and last end that journey combination ultrasonic velocity attenuation characteristic is determined, the leakage at shown first and last end
Transient information is generated by the transition of the velocity of sound and the transition of flow, small due to occurring in pipeline in the embodiment of the present invention
When leakage rate, the head end velocity of sound is reduced, and flow increases and the end velocity of sound is reduced, and flow is reduced, therefore can be by measuring pipeline
The leakage transient information at first and last end monitors whether pipeline leaks, and accurately embodies leakage information, to be accurately positioned small
The anchor point for leaking and simmering.
103, according to the leakage transient information at the first and last end carry out the fused head end information fusion signal of information with
And final word fusion signal determines delay time, and calculates leakage point apart from pipeline using preset leak point positioning formula
The distance of head end ultrasonic velocity sensor.
For the embodiment of the present invention, due to including velocity of sound signal and flow signal in the transient information of first and last end, need
Will leakage transient information to first and last end carry out information fusion, then pass through fused head end information fusion signal and end
Information fusion signal determines that delay time, the delay time are the sum of the time catastrophe point of first terminal fusion signal, so
Distance of the leakage point apart from pipeline head end ultrasonic velocity sensor is calculated according to preset leak point positioning formula afterwards.
For the embodiment of the present invention, in order to pre-establish out leakage transient information propagation attenuation computation model, to obtain
The data direct modeling operation of acquisition is got, it is described to obtain the ultrasonic velocity sensor for being separately mounted to pipeline first and last end, stream
The flow velocity signal of quantity sensor acquisition, before velocity of sound signal, the method also includes:
It is according to the Transient Flow in Pipeline equation that the equation of motion, continuity equation establish liquidWherein, v is flow velocity, and ρ is fluid density, and D is pipe
Road internal diameter, alpha levels axle clamp angle, λ are darcy hydraulic simulation experiment, and x is the axial distance along pipeline, and t is time, awFor suction wave
Velocity of wave, g are acceleration of gravity, acFor the velocity of sound in liquid, a0For the velocity of sound in liquid under one atmospheric pressure of room temperature, K is proportionality coefficient；
When ignoring elevation variation, then the node i at the j moment established according to gsin α=0 is along C+And C-Finite difference equations be respectively Wherein, aci,jIndicate the ultrasonic acoustic at i-node j moment
Speed；vi,The flow velocity at j expression i-node j moment；When Sudden Leakage point is the i-node j moment, and assume at j-1 moment pipeline fluid
It in steady state condition, is remained unchanged in the parameter of j+1 moment i+2 node, is solved to obtain leakage wink according to the finite difference equations
Become information propagation attenuation computation model into Wherein, the boundary condition of leakage point meetsFmFor the information transition of pipe end, Δ FmFor the information of pipe end
The increment of transition, acmAnd vmThe respectively velocity of sound and flow velocity of pipe end, LxFor leakage point to the distance of pipeline first section, Δ x is
Run of designing, Δ x=awΔ t, FsFor the information transition of pipeline head end, Δ FsFor the increment of the information transition of pipeline head end, acs
And vsThe respectively velocity of sound and flow velocity of pipeline head end, LxFor leakage point to the distance of pipeline first section, Fu-For the information before leakage point
Transition.
For the embodiment of the present invention, in order to ensure the equation of motion, contiguity equation can be stable foundation, need to set pipe
Road caliber, tubing, wall thickness and tube fluid property remain unchanged within the scope of pipe range.Join for the equation of motion and continuity equation
It is solved after vertical, is one group of hyperboloid partial differential equation to composition, is solved by characteristics method.
In addition, the working fluid in pipeline is hydro carbons by being the positioning to the leakage point of oil pipeline in this present embodiment
The petroleum of substance, acoustic characteristic meet the rule of Kneser liquid, i.e., at a certain temperature, the velocity of sound is linear with increasing for pressure
Ground increases, thus in the presence ofWherein, p is pressure, acFor the velocity of sound in liquid, a0For in liquid under one atmospheric pressure of room temperature
The velocity of sound, K are proportionality coefficient, can be inferred to the equation of motion and continuity equation When for using characteristics method, need to ignore elevation variation, and the C established+Characteristic curve and its spy
Levying equation isAnd C-Characteristic curve and its characteristic equation areThen using finite difference calculus to above-mentioned C+、C-Characteristic equation counted
Value solves, characteristic curve network schematic diagram, as shown in Figure 3, wherein pipeline is divided into N sections, and every section of pipe range is Δ x, long along pipeline
Degree x-axis respectively indicates the node between pipeline section marked as 1,2 ..., N+1, and being divided into time horizon along time t axis is Δ t.
In the embodiment of the present invention, according to the flow velocity before pipe leakage, the flow velocity that leakage counts out money, the flow velocity after leakage, leakage
Flow velocity, the velocity of sound before leakage point, the velocity of sound after leakage point after point, and the boundary condition for limiting leakage point needs to meet:To obtain the sonic velocity change of leakage pointObtain the velocity of sound and leakage rate, the density of medium, suction wave wave that leakage generates
Speed is related with the acoustic velocity value of normal atmosphere pressure.
Further solve, along C+From point (i+, j) and (i+1, j+1) is arrived, obtaining equation isBoth sides take increment to obtain simultaneously,And it enablesFu+For the information transition after leakage point.Then due to leakage
Transient information is to transmit from leakage point to pipe ends, therefore remain unchanged in the parameter of j+1 moment i+2 node, obtains Δ
aci+1,j+1=Ka0ρawΔvi+1,j+1, wherein the Parameters variation of j+2 moment i+2 node can be expressed asFurther obtainIn conjunction with Fu+Definition,
It obtainsSimilarly, the Parameters variation of j+3 moment i+3 node can table
Up to forTo push over outAndWherein, F is definedu-It is for the information transition before leakage point
Further, in the embodiment of the present invention, in order to avoid at leakage point due to acoustic velocity value, flow speed value change and cause
The unstability for leaking transient information needs to carry out information fusion to the leakage transient information at first and last end, and the basis is to described
The leakage transient information at first and last end carries out the fused head end information fusion signal of information and final word fusion signal determines
Out before delay time, the method also includes: utilize the head end velocity of sound, flow and the end velocity of sound, stream when pipeline leaks
Corresponding relationship between amount carries out information fusion to the leakage transient information at the first and last end, obtains the leakage transition of first and end
Information FsAnd FmRespectively Fs=acs-Ka0ρawvs, Fm=acm+Ka0ρawvm。
For the embodiment of the present invention, since acoustic velocity value at leakage point and flow speed value all change, and with certain velocity of wave
Signal propagation is carried out to pipeline first and last end, leakage transient information can carry out signal by ultrasonic velocity sensor and flowmeter
Acquisition, therefore, leakage transient information not only includes velocity of sound signal, but also including flow signal, is propagated according to leakage transient information
Two formula in decay calculation model, can infer when pipeline leaks, and the head end velocity of sound is reduced, and flow increases, and
The end velocity of sound is reduced, and flow is reduced, therefore, the leakage transient information F at first and last endsAnd FmIt is all corresponding to reduce.In addition, by inference
F outs=acs-Ka0ρawvs、Fm=acm+Ka0ρawvmWhether pipeline is monitored to measure the leakage transient information at pipeline first and last end
It leaks.
In the embodiment of the present invention, in order to calculate distance of the leakage point apart from pipeline head end ultrasonic velocity sensor into
Step refining, the basis to the leakage transient information at the first and last end carry out the fused head end information fusion signal of information with
And final word fusion signal determines delay time, and calculates leakage point apart from pipeline using preset leak point positioning formula
The distance of head end ultrasonic velocity sensor includes: to utilize the wavelet analysis method leakage transition to the fused head end of information respectively
Information FsAnd the leakage transient information F of endmExtract mutation time point, according to cross-correlation analysis method and it is pre-set when
Between window the search of rough time to peak carried out to the mutation time point determined for the first delay time, and according to cross-correlation analysis method
And pre-set time window carries out accurate time to peak search to the mutation time point and determined for the second delay time, it will
The sum of first delay time and second delay time are determined as delay time；Utilize preset leak point positioning formulaCalculate distance of the leakage point apart from pipeline head end ultrasonic velocity sensor, wherein the tDFor delay
Time, L are duct length.
For the embodiment of the present invention, in order to extract the peak point of time catastrophe point by cross-correlation function, and rationally choosing
Position and the length of two signal segments as cross-correlation are selected, to guarantee that cross-correlation function has apparent peak point, first with
Wavelet analysis method extracts the catastrophe point (time) of pipeline first and last end measurement fusion signal, and time window is arranged according to the position of catastrophe point
To extract pipeline first and last end fusion signal length.Start timing when the catastrophe point that first merges signal reaches certain threshold value,
Stop timing when the catastrophe point that second merges signal reaches certain threshold value, then records interval time.
In the embodiment of the present invention, it is assumed that the time span for acquiring signal is 0~t0, the time that wavelet packet analysis measures is t1,
So measure in wavelet packet and signal acquisition length intercepted on time basis, retain head end fusion signal correspond to the time be 0
~(t0-t1) signal length；Terminal fusion signal corresponds to t1~t0Signal length.Corresponding time span signal will be retained to make
For the signal data of new time series.The schematic diagram of pipeline first and last segment signal catastrophe point time difference, as shown in Figure 4.For the first time
It carries out rough time to peak using cross-correlation analysis to search for, acquiring first terminal fusion signal time is 0~(t respectively0-t1) and
t1~t0, interval acquires data progress cross-correlation analysis, estimates the delay time t of signalD1.Second using correlation analysis into
The accurate time to peak search of row, in the delay time t of the first correlation analysis estimationD1Front and back respectively takes certain sampling period to carry out the
Secondary correlation analysis retrieves maximum value tD2.The delay time of estimation after searching for twice is tD=tD1+tD2, tD1For for the first time
Rough search cross-correlation peak value, tD2For second of coarse-fine fine searching cross-correlation peak value.
Then it when pipe leakage occurs, is analyzed, is obtained by the cross-correlation function that pipeline head and end information merges signal
To the peak value R of two client informations fusion signalsm(τ), i.e. acquisition delay time tD, wherein leakage transient information is gone by wavelet packet
After making an uproar, the signal at first and last end is FsAnd FmCross-correlation function beT is the leakage velocity of sound
The propagation period between two ultrasonic sensors.Finally utilize preset leak point positioning formulaIt calculates and lets out
Distance of the leak source apart from pipeline head end ultrasonic velocity sensor.
For the embodiment of the present invention, specific application scenarios can be as follows, but not limited to this, comprising: selection pipeline
Length is 2000 meters, and internal diameter of the pipeline is DN 50, and the first and last end of pipeline is separately installed with ultrasonic velocity sensor, flow sensing
Device, temperature sensor, and the flow for setting current fluid conveying is installed different leakage apertures and is let out to simulate difference as 12m3/h
Leakage degree, according to live physical condition, the lift of pipe outlet pump is 120 meters of H2O water column.In addition the density of selection fluid is
1000kg/m3, ultrasonic velocity 1520m/s, suction wave velocity of wave is 1120m/s, and wherein the value of K is 2.13 × 10-6.When away from
From at 400 meters of pipeline head end leak valve open, at this time Small leak amount be 2.5L/min, in order to by flow, the velocity of sound, pressure etc. no
Same parameter compares, the Daubechies 4 of flow signal, ultrasonic velocity signal, pressure signal through wavelet packet of acquisition
(db4) it decomposes and carries out signal de-noising, it has been found by contrast that when Small leak occurs, corresponding discharge, velocity of sound signal and pressure signal difference
As shown in Fig. 5, Fig. 6, Fig. 7, then by leaking the pipe obtained after transient information propagation attenuation computation model and signal fused
It is as shown in Figure 8, Figure 9 that road head end information merges signal, pipe end information fusion signal difference, wherein fusion signal has one
Obviously inflection point.Then information fusion signal is subjected to cross-correlation analysis.It is adopted firstly, information is merged the sigtnal interval 1
Sampling point is sampled, and is then carried out first time cross-correlation analysis, is obtained correlation analysis peak value, i.e. delay time tD1, such as Figure 10 institute
The first time cross-correlation analysis shown, then, in time to peak tD1Around, i.e., 50 sampled points are respectively taken in prime information fusion signal,
Cross-correlation analysis is carried out again, obtains time to peak tD2, second of cross-correlation analysis as shown in figure 11 finally obtain delay time
tDFor -1.22s, merge signal improves cross-correlation function, the classical cross-correlation function that merges signal, ultrasonic velocity signal
The classical cross-correlation function of classical cross-correlation function and pipeline first and last side pressure force signal is as shown in figure 12.Since Small leak amount is
2.5L/min, at 400 meters of pipeline head end, the first and last end signal catastrophe point cross-correlation time difference should be -1.2s. can be with from Figure 12
Find out, the cross-correlation analysis that improves that information merges signal calculates the time difference of acquisition as -1.22s, and information merges the classics of signal mutually
The time difference that correlation analysis calculates acquisition is -0.8s, and the time difference that the classical cross-correlation analysis of velocity of sound signal calculates acquisition is -0.52s,
And the peak point that the classical cross-correlation analysis of pressure calculates acquisition is more, which is peak point caused by leaking for bad determination, from
And according to Figure 13, Figure 14, giving leakage rate is the pipeline first and last client information under 2.5L/min, 1.5L/min and 1L/min
Signal contrast curve is merged, with the reduction of leakage rate, the amplitude of information fusion waveform is gradually reduced.When leakage rate reaches 1L/
When min, the more difficult identification of waveform inflection point is determined position error and is increased accordingly so causing to leak, and passes through and improves cross-correlation analysis estimation
The time difference, and leakage point position is calculated using preset leak point positioning formula, it obtains occurring when leak position apart from pipeline head end
600m, 800m and 1400m, the position location error directly obtained compared to existing classical cross-correlation analysis are obviously reduced.
The present invention provides a kind of localization methods of pipe leakage, with existing under Small leak and the pressure signal simmered
It drops unintelligible along inflection point, it is larger to cause to fail to report higher and position error, and punch installation pressure sensor using pipeline to bring
Danger, the locating effect for influencing pipe leakage are compared, and the embodiment of the present invention is established by the mechanism of transmission of ultrasonic velocity
The velocity of sound generates and propagation attenuation computation model, and ultrasonic velocity and flow signal carried out signal fused, so that information
Fusion signal can more burst signal knee, can more accurately extract pipeline first and last end by improving cross-correlation analysis method
Information merges the time difference of signal, so as to improve the positioning accuracy of Small leak, fast and effeciently positions Small leak point, improves pipe
The efficiency of road leakage positioning.
Further, as the realization to method shown in above-mentioned Fig. 1, the embodiment of the invention provides a kind of pipe leakages
Positioning device, as shown in figure 15, the device include: acquiring unit 21, the first computing unit 22, the second computing unit 23.
Acquiring unit 21, for obtaining the ultrasonic velocity sensor, the flow sensor that are separately mounted to pipeline first and last end
Flow velocity signal, the velocity of sound signal of acquisition, the flow velocity signal include the flow velocity signal of pipeline head end and the flow velocity letter of pipe end
Number, the velocity of sound signal includes the velocity of sound signal of pipeline head end and the velocity of sound signal of pipe end；
First computing unit 22, for according to the leakage transient information propagation attenuation computation model pre-established according to
Flow velocity signal, the velocity of sound signal calculate the leakage transient information at first and last end, and the leakage transient information propagation attenuation calculates
Model is the pipeline first and last determined according to the equation of motion and continuity equation combination ultrasonic velocity attenuation characteristic of pipeline
The transient information computation model at end；
Second computing unit 23, for carrying out the fused head end of information according to the leakage transient information to the first and last end
Information fusion signal and final word fusion signal determine delay time, and are calculated using preset leak point positioning formula
Distance of the leakage point apart from pipeline head end ultrasonic velocity sensor.
Further, as shown in figure 16, described device further include: first establishing unit 24, second establish unit 25, solve
Unit 26.
First establishing unit 24, for establishing the Transient Flow in Pipeline equation of liquid according to the equation of motion, continuity equation
ForWherein, v is flow velocity, and ρ is fluid density, and D is
Internal diameter of the pipeline, alpha levels axle clamp angle, λ are darcy hydraulic simulation experiment, and x is the axial distance along pipeline, and t is time, awFor negative pressure
Wave velocity of wave, g are acceleration of gravity, acFor the velocity of sound in liquid, a0For the velocity of sound in liquid under one atmospheric pressure of room temperature, K is ratio system
Number；
Second establishes unit 25, ignores elevation variation, the then node i at the j moment established according to gsin α=0 for working as
Along C+And C-Finite difference equations be respectively Wherein, aci,jIndicate the ultrasonic acoustic at i-node j moment
Speed；vi,jIndicate the flow velocity at i-node j moment；
Unit 26 is solved, for being the i-node j moment when Sudden Leakage point, and assumes that j-1 moment pipeline fluid is in steady
State operating condition is remained unchanged in the parameter of j+1 moment i+2 node, is solved to obtain leakage transition letter according to the finite difference equations
Ceasing propagation attenuation computation model is Wherein, the boundary condition of leakage point meetsFmFor the information transition of pipe end, Δ FmFor the information of pipe end
The increment of transition, acmAnd vmThe respectively velocity of sound and flow velocity of pipe end, LxFor leakage point to the distance of pipeline first section, Δ x is
Run of designing, Δ x=awΔ t, FsFor the information transition of pipeline head end, Δ FsFor the increment of the information transition of pipeline head end, acs
And vsThe respectively velocity of sound and flow velocity of pipeline head end, LxFor leakage point to the distance of pipeline first section, Fu-For the information before leakage point
Transition.
Further, as shown in figure 16, described device further include:
Integrated unit 27, for utilizing when pipeline leaks between the head end velocity of sound, flow and the end velocity of sound, flow
Corresponding relationship carries out information fusion to the leakage transient information at the first and last end, obtains the leakage transient information F of first and endsAnd Fm
Respectively Fs=acs-Ka0ρawvs, Fm=acm+Ka0ρawvm。
Second computing unit 23, specifically for utilizing the wavelet analysis method leakage to the fused head end of information respectively
Transient information FsAnd the leakage transient information F of endmMutation time point is extracted, according to cross-correlation analysis method and is preset
Time window the search of rough time to peak carried out to the mutation time point determined for the first delay time, and according to cross-correlation point
When analysis method and pre-set time window determine the second delay to the accurate time to peak search of mutation time point progress
Between, the sum of first delay time and second delay time are determined as delay time；Utilize preset leak point positioning
FormulaCalculate distance of the leakage point apart from pipeline head end ultrasonic velocity sensor, wherein the tDFor
Delay time, L are duct length.
The present invention provides a kind of positioning device of pipe leakage, the embodiment of the present invention passes through the propagation machine of ultrasonic velocity
Reason establishes velocity of sound generation and propagation attenuation computation model, and ultrasonic velocity and flow signal has been carried out signal fused, makes
Signal knee can more be burst by obtaining information fusion signal, can more accurately extract pipeline by improving cross-correlation analysis method
First and last client information merges the time difference of signal, so as to improve the positioning accuracy of Small leak, fast and effeciently positions Small leak point,
Improve the efficiency of pipe leakage positioning.
A kind of storage medium is provided according to an embodiment of the present invention, and it is executable that the storage medium is stored at least one
The localization method of the pipe leakage in above-mentioned any means embodiment can be performed in instruction, the computer executable instructions.
Figure 17 shows a kind of structural schematic diagram of the terminal provided according to an embodiment of the present invention, the present invention is specifically real
Example is applied not limit the specific implementation of terminal.
As shown in figure 17, which may include: processor (processor) 502, communication interface
(Communications Interface) 504, memory (memory) 506 and communication bus 508.
Wherein: processor 502, communication interface 504 and memory 506 complete mutual lead to by communication bus 508
Letter.
Communication interface 504, for being communicated with the network element of other equipment such as client or other servers etc..
Processor 502 can specifically execute in the localization method embodiment of above-mentioned pipe leakage for executing program 510
Correlation step.
Specifically, program 510 may include program code, which includes computer operation instruction.
Processor 502 may be central processor CPU or specific integrated circuit ASIC (Application
Specific Integrated Circuit), or be arranged to implement the integrated electricity of one or more of the embodiment of the present invention
Road.The one or more processors that terminal includes can be same type of processor, such as one or more CPU；It is also possible to
Different types of processor, such as one or more CPU and one or more ASIC.
Memory 506, for storing program 510.Memory 506 may include high speed RAM memory, it is also possible to further include
Nonvolatile memory (non-volatile memory), for example, at least a magnetic disk storage.
Program 510 specifically can be used for so that processor 502 executes following operation:
Obtain be separately mounted to pipeline first and last end ultrasonic velocity sensor, flow sensor acquisition flow velocity signal,
Velocity of sound signal, the flow velocity signal include the flow velocity signal of pipeline head end and the flow velocity signal of pipe end, the velocity of sound signal
The velocity of sound signal of velocity of sound signal and pipe end including pipeline head end；
Believed according to the leakage transient information propagation attenuation computation model pre-established according to the flow velocity signal, the velocity of sound
The leakage transient information at first and last end number is calculated, the leakage transient information propagation attenuation computation model is the movement according to pipeline
The transient information computation model at the pipeline first and last end that equation and continuity equation combination ultrasonic velocity attenuation characteristic are determined；
The fused head end information fusion signal of information and end are carried out according to the leakage transient information to the first and last end
Client information fusion signal determines delay time, and calculates leakage point apart from pipeline head end using preset leak point positioning formula
The distance of ultrasonic velocity sensor.
Obviously, those skilled in the art should be understood that each module of the above invention or each step can be with general
Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
It is performed by computing device in the storage device, and in some cases, it can be to be different from shown in sequence execution herein
Out or description the step of, perhaps they are fabricated to each integrated circuit modules or by them multiple modules or
Step is fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific hardware and softwares to combine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all include within protection scope of the present invention.
Claims (8)
1. a kind of localization method of pipe leakage characterized by comprising
Obtain the ultrasonic velocity sensor for being separately mounted to pipeline first and last end, the flow velocity signal of flow sensor acquisition, the velocity of sound
Signal, the flow velocity signal include the flow velocity signal of pipeline head end and the flow velocity signal of pipe end, and the velocity of sound signal includes
The velocity of sound signal of pipeline head end and the velocity of sound signal of pipe end；
According to the leakage transient information propagation attenuation computation model pre-established according to the flow velocity signal, the velocity of sound signal meter
The leakage transient information at first and last end is calculated, the leakage transient information propagation attenuation computation model is the equation of motion according to pipeline
And the transient information computation model at pipeline first and last end that continuity equation combination ultrasonic velocity attenuation characteristic is determined；
The fused head end information fusion signal of information and end letter are carried out according to the leakage transient information to the first and last end
Breath fusion signal determines delay time, and calculates leakage point apart from pipeline head end ultrasound using preset leak point positioning formula
The distance of wave sonic sensor；
Wherein, the flow velocity for obtaining the ultrasonic velocity sensor for being separately mounted to pipeline first and last end, flow sensor acquisition
Before signal, velocity of sound signal, the method also includes:
It is according to the Transient Flow in Pipeline equation that the equation of motion, continuity equation establish liquidWherein, v is flow velocity, and ρ is fluid density, and D is pipe
Road internal diameter, alpha levels axle clamp angle, λ are darcy hydraulic simulation experiment, and x is the axial distance along pipeline, and t is time, awFor suction wave
Velocity of wave, g are acceleration of gravity, acFor the velocity of sound in liquid, a0For the velocity of sound in liquid under one atmospheric pressure of room temperature, K is proportionality coefficient；
When ignoring elevation variation, then the node i at the j moment established according to gsin α=0 is along C+And C-Finite difference equations point
It is not Wherein, aci,jIndicate the ultrasonic acoustic at i-node j moment
Speed；vi,jIndicate the flow velocity at i-node j moment；
When Sudden Leakage point is the i-node j moment, and assume that j-1 moment pipeline fluid is in steady state condition, in j+1 moment i+2
The parameter of node remains unchanged, and solves to obtain leakage transient information propagation attenuation computation model according to the finite difference equations and is
Wherein, the boundary condition of leakage point meetsFmFor the information of pipe end
Transition, Δ FmFor the increment of the information transition of pipe end, acmAnd vmThe respectively velocity of sound and flow velocity of pipe end, LxFor leakage
Point arrives the distance of pipeline first section, and Δ x is run of designing, Δ x=awΔ t, FsFor the information transition of pipeline head end, Δ FsFor pipe
The increment of the information transition of road head end, acsAnd vsThe respectively velocity of sound and flow velocity of pipeline head end, Fu-For the information wink before leakage point
Become.
2. the method according to claim 1, wherein the basis to the leakage transient information at the first and last end into
Before the fused head end information fusion signal of row information and final word fusion signal determine delay time, the method
Further include:
Using the corresponding relationship when pipeline leaks between the head end velocity of sound, flow and the end velocity of sound, flow to the first and last
The leakage transient information at end carries out information fusion, obtains the leakage transient information F of first and endsAnd FmRespectively Fs=acs-Ka0ρ
awvs, Fm=acm+Ka0ρawvm。
3. according to the method described in claim 2, it is characterized in that, the basis to the leakage transient information at the first and last end into
The fused head end information fusion signal of row information and final word fusion signal determine delay time, and are let out using preset
Leak source ranging formula calculates distance of the leakage point apart from pipeline head end ultrasonic velocity sensor
Using wavelet analysis method respectively to the leakage transient information F of the fused head end of informationsAnd the leakage transient information of end
FmMutation time point is extracted, the mutation time point is carried out according to cross-correlation analysis method and pre-set time window rough
Time to peak search determined for the first delay time, and according to cross-correlation analysis method and pre-set time window to described prominent
Become the accurate time to peak search of time point progress and determined for the second delay time, first delay time is prolonged with described second
The sum of slow time is determined as delay time；
Utilize preset leak point positioning formulaLeakage point is calculated to sense apart from pipeline head end ultrasonic velocity
The distance of device, wherein the tDFor delay time, L is duct length.
4. a kind of positioning device of pipe leakage characterized by comprising
Acquiring unit, for obtaining the ultrasonic velocity sensor for being separately mounted to pipeline first and last end, flow sensor acquires
Flow velocity signal, velocity of sound signal, the flow velocity signal include the flow velocity signal of pipeline head end and the flow velocity signal of pipe end, described
Velocity of sound signal includes the velocity of sound signal of pipeline head end and the velocity of sound signal of pipe end；
First computing unit, for being believed according to the leakage transient information propagation attenuation computation model pre-established according to the flow velocity
Number, the velocity of sound signal calculate the leakage transient information at first and last end, the leakage transient information propagation attenuation computation model is
According to the wink at the pipeline first and last end that the equation of motion of pipeline and continuity equation combination ultrasonic velocity attenuation characteristic are determined
Become information computation model；
Second computing unit melts for carrying out the fused head end information of information according to the leakage transient information to the first and last end
It closes signal and final word fusion signal determines delay time, and calculate leakage point using preset leak point positioning formula
Distance apart from pipeline head end ultrasonic velocity sensor；
Wherein, described device further include:
First establishing unit, the Transient Flow in Pipeline equation for establishing liquid according to the equation of motion, continuity equation areWherein, v is flow velocity, and ρ is fluid density, and D is pipe
Road internal diameter, alpha levels axle clamp angle, λ are darcy hydraulic simulation experiment, and x is the axial distance along pipeline, and t is time, awFor suction wave
Velocity of wave, g are acceleration of gravity, acFor the velocity of sound in liquid, a0For the velocity of sound in liquid under one atmospheric pressure of room temperature, K is proportionality coefficient；
Second establishes unit, for when ignoring elevation variation, then the node i at the j moment established according to gsin α=0 to be along C+And C-
Finite difference equations be respectively Wherein, aci,jIndicate the ultrasonic acoustic at i-node j moment
Speed；vi,jIndicate the flow velocity at i-node j moment；
Unit is solved, for being the i-node j moment when Sudden Leakage point, and assumes that j-1 moment pipeline fluid is in stable state work
Condition is remained unchanged in the parameter of j+1 moment i+2 node, is solved to obtain leakage transient information biography according to the finite difference equations
Broadcasting decay calculation model is Wherein, the boundary condition of leakage point meetsFmFor the information transition of pipe end, Δ FmFor the information of pipe end
The increment of transition, acmAnd vmThe respectively velocity of sound and flow velocity of pipe end, LxFor leakage point to the distance of pipeline first section, Δ x is
Run of designing, Δ x=awΔ t, FsFor the information transition of pipeline head end, Δ FsFor the increment of the information transition of pipeline head end, acs
And vsThe respectively velocity of sound and flow velocity of pipeline head end, Fu-For the information transition before leakage point.
5. device according to claim 4, which is characterized in that described device further include:
Integrated unit, for being closed using the head end velocity of sound, flow are corresponding between the end velocity of sound, flow when pipeline leaks
It is that information fusion is carried out to the leakage transient information at the first and last end, obtains the leakage transient information F of first and endsAnd FmRespectively
Fs=acs-Ka0ρawvs, Fm=acm+Ka0ρawvm。
6. device according to claim 5, which is characterized in that
Second computing unit, specifically for being believed respectively the leakage transition of the fused head end of information using wavelet analysis method
Cease FsAnd the leakage transient information F of endmMutation time point is extracted, according to cross-correlation analysis method and pre-set time
Window carries out the search of rough time to peak to the mutation time point and determined for the first delay time, and according to cross-correlation analysis method with
And pre-set time window carries out accurate time to peak search to the mutation time point and determined for the second delay time, by institute
Stating the sum of the first delay time and second delay time is determined as delay time；Utilize preset leak point positioning formulaCalculate distance of the leakage point apart from pipeline head end ultrasonic velocity sensor, wherein the tDFor delay
Time, L are duct length.
7. a kind of storage medium, it is stored with an at least executable instruction in the storage medium, the executable instruction makes to handle
Device executes the corresponding operation of localization method such as pipe leakage of any of claims 1-4.
8. a kind of terminal, comprising: processor, memory, communication interface and communication bus, the processor, the memory and
The communication interface completes mutual communication by the communication bus；
The memory executes the processor as right is wanted for storing an at least executable instruction, the executable instruction
Ask the corresponding operation of the localization method of pipe leakage described in any one of 1-4.
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| CN109340585B (en) * | 2018-10-26 | 2020-10-27 | 北京化工大学 | Pipeline leakage detection and positioning method |
| CN109469834B (en) * | 2018-12-07 | 2020-04-24 | 中国石油大学(北京) | Liquid pipeline leakage detection method, device and system |
| CN110131594A (en) * | 2019-05-20 | 2019-08-16 | 辽宁石油化工大学 | A kind of leakage locating method based on ultrasonic velocity variation |
| CN110159937A (en) * | 2019-07-02 | 2019-08-23 | 北京中计新业科技发展有限公司 | A kind of pipeline leakage detection method of naval vessel pipe network |
| CN110513603B (en) * | 2019-08-13 | 2021-09-28 | 常州大学 | Non-metal pipeline leakage positioning method based on inverse transient analysis method |
| CN112413413B (en) * | 2020-11-20 | 2022-03-01 | 成都艾斯皮埃尔科技有限公司 | Pipeline leakage monitoring and positioning method combining deep learning and multiple measurement technology |
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