CN104864274B - Pipe leakage acoustic signals Enhancement Method - Google Patents
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- CN104864274B CN104864274B CN201510275111.8A CN201510275111A CN104864274B CN 104864274 B CN104864274 B CN 104864274B CN 201510275111 A CN201510275111 A CN 201510275111A CN 104864274 B CN104864274 B CN 104864274B
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Abstract
The invention discloses a kind of pipe leakage acoustic signals Enhancement Method.This method comprises the following steps：The pipeline inside acoustic signals obtained by dynamic pressure transmitter are sampled, the pending acoustic signals of a frame that length is M points are obtained；Acoustic signals pending to a frame carry out low-pass filtering treatment, eliminate frequency and are higher than fcHigh-frequency Interference acoustic signals；According to formulaEnhancing processing is carried out to acoustic signals after denoising, the enhanced acoustic signals of a frame are obtained.It can compensate for the integral term of the reflecting wave signal LF-response characteristic lacked in the output of dynamic pressure transmitter, has stabilization, significant enhancing effect to pipe leakage acoustic signals, improves the signal to noise ratio of pipe leakage acoustic signals.And when carrying out signal enhancing processing, parameter selection is simple, amount of calculation is small, the real-time that whole processing method is implemented is very strong.
Description
Technical field
Believe the present invention relates to the signal transacting in Discussion on Pipe Leakage Detection Technology field, more particularly to a kind of pipe leakage sound wave
Number Enhancement Method.
Background technology
Pipeline transportation is the major way of fossil energy and harmful influence conveying, due to pipeline aging, corrosion failure and punching
The reasons such as stolen, pipe leakage happens occasionally, and causes resources loss, environmental pollution even casualties.Therefore, pipe leakage is examined
Survey technology is developed so far, and is still one of the hot issue of domestic and foreign scholars research.In existing negative pressure wave method, sonic method, matter
In the pipelines leakage detection methods such as amount/volumetric balance method, distribution type fiber-optic method, because sonic sensor frequency response is wide,
The features such as sensitivity is high, correlation function peak is sharp, is letting out of most being approved at present in terms of Sensitivity of leak test and positioning precision
Leak detection method.The speed that the sensitvity constraint of sonic method pipeline leakage testing occurs in the size of slip and leakage, signal
Enhancing is necessary technological means in leak detection practice.But traditional Wavelet Denoising Method and EMD decompose (Empirical Mode
Decomposition, empirical mode decomposition) method can not all realize the signal enhancing of active to be difficult to ensure that stable signal
Enhancing effect.Wavelet Denoising Method is a kind of signal enhancing method of non-self-adapting, and the different wavelet basis of selection or filter scale may
Antipodal signal enhancing effect can be obtained；And EMD methods do not only exist the problem of boundary effect is difficult to effectively overcome, and
The problem of also solving which IMF component reconstruction signal of selection.In fact, due to metallic conduit and its pumped (conveying) medium have it is low
The frequency domain distribution of its frequency domain distribution and pipeline internal interference signals base when frequency filtering characteristic, leakage signal travel to first and last station
This is overlapping, and the active ingredient of leakage signal can also certainly will incur loss while noise is suppressed, and is leaked and small for slow
Leakage is even more so.Therefore, a kind of stable acoustic signals active Enhancement Method of enhancing effect is explored to be significant.
The content of the invention
Based on this, it is necessary to which providing a kind of can effectively strengthen the pipe leakage acoustic signals Enhancement Method of acoustic signals.
To realize a kind of pipe leakage acoustic signals Enhancement Method that the object of the invention is provided, comprise the following steps：
The pipeline inside acoustic signals obtained by dynamic pressure transmitter are sampled, it is the one of M points to obtain length
The pending acoustic signals of frame；
Acoustic signals pending to a frame carry out low-pass filtering treatment, eliminate frequency and are higher than fcInterference sound wave letter
Number, obtain acoustic signals after denoising；
Enhancing processing is carried out to acoustic signals after the removal noise according to below equation, the enhanced sound wave of a frame is obtained
Signal：
Wherein, y (t) is acoustic signals after denoising,For y (t) integral term, KsFor low frequency gain factors
(Ks>=1), fy (t) is enhanced acoustic signals.
As a kind of embodiment of pipe leakage acoustic signals Enhancement Method, the M=2N, wherein N are positive integer,
The pending acoustic signals of one frame include N point historical datas and N point real time datas, the last point of the N points historical data
On the historical data time before first real time data of the N points real time data, and the last point historical data with
First real time data is two continuous sampled points.
As a kind of embodiment of pipe leakage acoustic signals Enhancement Method, using the N point real time datas as working as
The N point historical datas of the pending acoustic signals of next frame of the pending acoustic signals of previous frame.
As a kind of embodiment of pipe leakage acoustic signals Enhancement Method, the dynamic pressure transmitter includes suitable
The sonic sensor of secondary connection, charge amplifier, preferably also include voltage order one amplifying circuit, low pass filter, two grades of electricity
Press amplifying circuit and V/I converter units；
And the sonic sensor insertion type is arranged on and carried out on the pipeline of leak detection, it is adaptable to inside sense pipeline
Sound wave change.
As a kind of embodiment of pipe leakage acoustic signals Enhancement Method, methods described passes through remote-terminal unit
Acoustic signals carry out A/D conversions with preset sample frequency inside the pipeline obtained to the dynamic pressure transmitter.
As a kind of embodiment of pipe leakage acoustic signals Enhancement Method, step is to the pending sound wave of a frame
Signal carries out low-pass filtering treatment, eliminates the interference acoustic signals that frequency is higher than fc；Beneficial effects of the present invention include：The present invention
The pipe leakage acoustic signals Enhancement Method of offer, it can compensate for the reflecting wave letter lacked in the output of dynamic pressure transmitter
Pipe leakage acoustic signals are had stabilization, significant enhancing effect by the integral term of number LF-response characteristic, and to pipeline inside just
Normal acoustic signals have no influence, improve the signal to noise ratio of pipe leakage acoustic signals.Entered using the acoustic signals after present invention processing
Row pipe leakage judges, can effectively reduce the rate of false alarm and rate of failing to report in leak detection.And when carrying out signal enhancing processing, ginseng
Number selection is simple, amount of calculation is small, and the real-time that whole processing method is implemented is very strong.
Brief description of the drawings
Fig. 1 is a kind of flow chart of a specific embodiment of pipe leakage acoustic signals Enhancement Method of the invention；
Fig. 2 is dynamic pressure general in an a kind of specific embodiment of pipe leakage acoustic signals Enhancement Method of the invention
Signal flow diagram in transmitter；
Fig. 3 for a kind of pipe leakage acoustic signals Enhancement Method of the invention a concrete application example in contain pipe leakage
One frame original figure acoustic signals of acoustic signals；
Acoustic signals of the Fig. 4 for the original figure acoustic signals in Fig. 3 after LPF；
Fig. 5 be Fig. 4 in acoustic signals by pipe leakage acoustic signals Enhancement Method processing after obtain it is enhanced
Pipe leakage acoustic signals.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing to the present invention's
The embodiment of pipe leakage acoustic signals Enhancement Method is illustrated.It should be appreciated that specific implementation described herein
Example is not intended to limit the present invention only to explain the present invention.
The pipe leakage acoustic signals Enhancement Method of one embodiment of the invention, as shown in figure 1, comprising the following steps：
The pipeline inside acoustic signals obtained by dynamic pressure transmitter are sampled, obtain length for M points by S100
The pending acoustic signals of a frame.
Wherein, can be by sequentially electric for obtaining and transmitting the dynamic pressure transmitter of acoustic signals inside detected pipeline
The sonic sensor of connection, charge amplifier, preferably also include voltage order one amplifying circuit, low pass filter, secondary voltage
Amplifying circuit and V/I converter units composition.Wherein, as shown in Fig. 2 charge amplifier is used as pipe leakage acoustic signals transport part
The pre-amplifier unit divided, voltage order one amplifying circuit, low pass filter and secondary voltage amplifying circuit collectively form pipeline and let out
The signal condition unit of acoustic signals hop is leaked, the V/I converter units constitute the signal transmitting of dynamic pressure transmitter
Unit.Sonic sensor is arranged on using insertion type mounting means by mounting hole inside the pipeline for implementing leak detection, and is felt
The change of acoustic signals inside test tube road.Specifically, sonic sensor can use piezoelectric pressure indicator, pass through mounting hole
On pipeline, and sensor end face is set to be in contact with the medium in tested pipeline, so as to obtain inside institute's detection pipeline
Acoustic signals.Electric charge amplification and voltage order one amplifying circuit of the acoustic signals by charge amplifier are amplified into low pass filtered
Ripple device carries out preliminary noise filtering, and acoustic signals carry out signal amplification by secondary voltage amplifying circuit again afterwards, again finally
The acoustic signals of voltage form are converted into 4-20mA current signal transfer to remote-terminal unit by V/I converter units
(RTU, Remote Terminal Unit).Current signal herein is used as acoustic signals inside foregoing pipeline.Current signal
In remote-terminal unit after sampling resistor, then by A/D converting units with preset sample frequency sampling obtain sound wave believe
Number data signal.Data signal by network interface can be uploaded to prison after microprocessor AT91SAM9261 ARM processing
Store and handle in control computer.Certainly can also be had using other the microprocessors of similar functions to data signal at
Reason.It will be understood by those skilled in the art that the pipe leakage acoustic signals Enhancement Method of the embodiment of the present invention is obtained except step S100
Take outside the pipe leakage acoustic signals of digital form, other the step of all can monitoring computer or other have computing function
Carried out in processor.
Herein it should be noted that the pipeline inside acoustic signals in the embodiment of the present invention refer in detected pipeline
All acoustic signals, rather than refer in particular to pipeline and occur leakage moment, or certain sound wave that leakage is had occurred and that comprising pipeline
Signal.After being handled by the method for the embodiment of the present invention acoustic signals inside detected pipeline, after processing
Data can more accurately determine whether detected pipeline is leaked.
And for sample frequency, can be determined according to the ability of the follow-up processor for carrying out data processing.For higher position reason
The processor of ability can be sampled using higher sample frequency to analog signal.
S200, acoustic signals pending to a frame carry out low-pass filtering treatment, eliminate frequency and are higher than fcBack drop
Ripple signal, obtains acoustic signals after denoising.In this step, the pending acoustic signals of a frame first can be passed through into cut-off frequency
For fcLowpass digital filter to eliminate High-frequency Interference, more preferably, LPF can be replaced by the way of Wavelet Denoising Method
Device carries out low-pass filtering treatment.
Acoustic signals after the removal noise are carried out enhancing processing according to formula (1), obtain enhanced sound wave by S300
Signal：
Wherein, y (t) is acoustic signals after denoising,For y (t) integral term, KsFor low frequency gain factors
(Ks>=1), fy (t) is enhanced acoustic signals.
Specifically, trapezoidal integration, rectangular integration can be used by carrying out numerical integration according to formula (1) in actual calculating process
And cubic spline difference product grading mode.It is illustrated herein with trapezoidal integration formula.Carried out using trapezoidal integration formula
When numerical integration is calculated, shown in calculating process such as formula (2).
Wherein, y (k) is the pending acoustic signals of kth point in the pending acoustic signals of a frame, and the 1st point of y (1) is pending
Acoustic signals, Sy (k) is the integral term to y (k), fsFor sample frequency, TcFor the time constant of charge amplifier, m increases for low frequency
Beneficial coefficient (m >=1), x (k) is acoustic signals inside the enhanced pipeline of kth point.
The pipe leakage acoustic signals Enhancement Method of the embodiment of the present invention, it can compensate in the output of dynamic pressure transmitter
Pipe leakage acoustic signals are had stabilization, significant enhancing effect by the integral term of the reflecting wave signal LF-response characteristic of missing
Really, to ambient noise and have no significant effect, improve the signal to noise ratio of pipe leakage acoustic signals.And from formula (1) and formula
(2) as can be seen that when carrying out signal enhancing processing, parameter selection is simple, amount of calculation is small, the real-time of whole processing method implementation is made
Property is very strong.It is follow-up that pipe leakage judgement is carried out according to enhanced signal, it can effectively reduce the rate of false alarm in leak detection
And rate of failing to report.
Wherein, for the composition of a frame pending data, in one of the embodiments, M is even number.M=2N, N is just
Integer.N points are N point historical datas before in the pending acoustic signals of a frame of M points, and rear N points are N point real time datas.The N points are gone through
On the last point historical data time of history data before first real time data of the N points real time data, and it is described most
Latter point historical data is two continuous sampled points with first real time data., equally can root for N specific value
Determined according to specific computational accuracy and the disposal ability of processor.Such as sample frequency fsM may be selected in=50Hz situation
6000, and N is 3000, i.e., the sampled data every time to 6000 points is handled.
One frame pending data is divided into after historical data and real time data, the N points in the pending data of present frame are real
When data can as next frame pending data N point historical datas so that two frame processing datas have certain connection,
It ensure that the integrality of abnormal signal.And adopt this method to shorten and constitute the pending of the new enough points of a frame
The time of signal.Accelerate the speed of data processing, while also just improving the efficiency of pipeline leakage testing.
It should be noted that in actual pipeline leakage testing, sound wave sensing is placed simultaneously in the initial station of pipeline and terminal
During device, the acoustic signals that can be obtained respectively to the sonic sensor of initial station and terminal carry out leakage signal using the method for the present invention
Enhancing is handled, and carries out the diagnosis of further pipe leakage and the determination of leak position using the signal after enhancing processing.
Below with an instantiation illustrate the present invention pipe leakage acoustic signals Enhancement Method processing procedure and its
The effect of signal enhancing.
As shown in figure 3, being one section of original figure acoustic signals (totally 6000 signals) containing pipe leakage acoustic signals.
The sampling precision of signal is 12, and sample frequency is 50Hz.Signal after db9 Wavelet Denoising Methods (wavelet decomposition scales are 3)
As shown in Figure 4.Then time domain trapezoidal integration signal enhancing (this is carried out to the filtered signal application formula (2) shown in Fig. 4 again
The gain coefficient m=50 of time-domain integration in example) afterwards signal it is as shown in Figure 5.From figure 5 it can be seen that at the 2000th point and
Pipe leakage acoustic signals between 3000 points have obtained obvious enhancing.It is computed drawing：Pipeline before strengthening as shown in Figure 2
The signal to noise ratio for leaking acoustic signals is 2.8dB, and the signal to noise ratio of enhanced pipe leakage acoustic signals as shown in Figure 5 is
9.7dB, signal to noise ratio enhances 6.9dB.Signal enhancing effect is obvious.
It will be understood by those skilled in the art that to solve the problem of invention is proposed, data processing section can be with computer
Based on program handling process, the computer program worked out by above-mentioned flow is performed by computer, pipe leakage sound wave is believed
Number carry out signal enhancing processing.And realize all or part of flow in above-described embodiment method can by computer program come
Related hardware is instructed to complete, described program can be stored in a computer read/write memory medium, the program is being performed
When, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic disc, CD, read-only storage
Memory body (Read-Only Memory, ROM) or random access memory (Random Access Memory, RAM) etc..
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (5)
1. a kind of pipe leakage acoustic signals Enhancement Method, it is characterised in that comprise the following steps：
The pipeline inside acoustic signals obtained by dynamic pressure transmitter are sampled, the frame that length is M points is obtained and treats
Handle acoustic signals；
Acoustic signals pending to a frame carry out low-pass filtering treatment, eliminate frequency and are higher than fcInterference acoustic signals, obtain
Acoustic signals after denoising；
Enhancing processing is carried out to acoustic signals after the denoising according to below equation, the enhanced acoustic signals of a frame are obtained：
Wherein, y (t) is acoustic signals after denoising,For y (t) integral term, KsFor low frequency gain factors, Ks≥
1, fy (t) is enhanced acoustic signals.
2. pipe leakage acoustic signals Enhancement Method according to claim 1, it is characterised in that M=2N, wherein N is just
Integer, the pending acoustic signals of a frame include N point historical datas and N point real time datas, the N points historical data it is last
On some historical data time before first real time data of the N points real time data, and N points historical data is most
First real time data of latter point historical data and the N points real time data is two continuous sampled points.
3. pipe leakage acoustic signals Enhancement Method according to claim 2, it is characterised in that count the N points in real time
According to the N point historical datas of the pending acoustic signals of next frame as the pending acoustic signals of present frame.
4. the pipe leakage acoustic signals Enhancement Method according to any one of claims 1 to 3, it is characterised in that described dynamic
State pressure transmitter include be sequentially connected with sonic sensor, charge amplifier, voltage order one amplifying circuit, low pass filter,
Secondary voltage amplifying circuit and V/I converter units；
And the sonic sensor insertion type is arranged on and carried out on the pipeline of leak detection, it is adaptable to the sound inside sense pipeline
Ripple changes.
5. pipe leakage acoustic signals Enhancement Method according to claim 4, it is characterised in that methods described passes through long-range
Acoustic signals carry out A/D conversions with preset sample frequency inside the pipeline that terminal unit is obtained to the dynamic pressure transmitter.
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| CN106594526B (en) * | 2016-12-02 | 2019-04-12 | 上海环宇消防集团有限公司 | A kind of water supply network state monitoring method and device based on hydraulic pressure sampled data |
| CN106989282B (en) * | 2017-05-16 | 2020-03-20 | 北京化工大学 | Virtual sound wave detection method and system for pipeline leakage |
| CN109088611A (en) * | 2018-09-28 | 2018-12-25 | 咪付（广西）网络技术有限公司 | A kind of auto gain control method and device of acoustic communication system |
| CN110131595B (en) * | 2019-05-21 | 2020-09-04 | 北京化工大学 | Method, device and system for processing pipeline slow leakage signal |
| CN112600473B (en) * | 2020-11-23 | 2023-06-30 | 江苏科技大学 | Permanent magnet synchronous motor rotor position estimation system and method |
| CN114576568B (en) * | 2022-02-25 | 2023-08-29 | 辽宁石油化工大学 | Pipeline leakage detection method and device based on infrasonic wave |
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| JP3688400B2 (en) * | 1996-08-23 | 2005-08-24 | 東京瓦斯株式会社 | Signal processing method in piping leak location identification method |
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| CN1755342A (en) * | 2004-09-28 | 2006-04-05 | 北京埃德尔黛威新技术有限公司 | Method and apparatus for detecting leakage of liquid pressure pipeline |
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