CN101206010B - Pipe jar destruction positioning system based on sound wave synergic detection and positioning method thereof - Google Patents
Pipe jar destruction positioning system based on sound wave synergic detection and positioning method thereof Download PDFInfo
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- CN101206010B CN101206010B CN2007101153485A CN200710115348A CN101206010B CN 101206010 B CN101206010 B CN 101206010B CN 2007101153485 A CN2007101153485 A CN 2007101153485A CN 200710115348 A CN200710115348 A CN 200710115348A CN 101206010 B CN101206010 B CN 101206010B
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Abstract
The invention discloses a pipe jarring damage positioning system and a positioning method based on acoustic wave cooperative detection. The system has the advantages of simple method, convenient use, timely alarming, property loss reduction and environmental pollution reduction. The method is as follows: (1) a plurality of test points are arranged on a pipe according to design requirements, and a transverse wave detection sensor and a longitudinal wave detection sensor are arranged at each test point; (2) in case of abnormal jar of the pipe, the transverse wave and longitudinal wave detection sensors at the nearest test point from the jarring point process received acoustic wave signals and determine the propagation time difference between transverse waves and longitudinal waves; (3) the time difference signal is sent to a host computer for comparing with data in a data base of the host computer, determining a jarring type and working out a sound velocity difference coefficient k on the one hand, and for positioning of the jarring point according to the formula s=kt carried out by the host computer on the other hand, wherein s representing the distance between the jarring point and the sensors at the test point, and t representing the signal reception time difference of the two sensors.
Description
Technical field
The present invention relates to relate to a kind of pipe jar destruction positioning system and localization method thereof that detects based on sound wave synergic.
Background technique
Line transportation is widely used in industrial and agricultural production and is bringing into play important effect in all trades and professions, owing to the burn into weld defect, the leakage that causes that damages naturally that reason causes such as shake and wash away and become serious day by day, the artificial destruction steal phenomenon of the petroleum pipeline that some are regional happens occasionally.Pipe leakage not only can influence normally carrying out of line transportation, causes heavy economic losses, and when, corrosivity toxic when carrying, inflammable and explosive medium, also pollutes the environment, and causes fire explosion.Therefore, the prevention of pipe leakage and timely warning, the location of leakage had very important practical sense.
Various pipeline leakage detection methods are in the pipe safety important function of having brought into play in service, but leakage detection method is state signals such as flow, pressure based on the pipeline inner fluid notable change have taken place, and could report to the police after having leaked.In the various reasons of initiation pipe leakage accident, the leakage that the artificial destruction pipeline causes surpasses corrosion and occupies the first place, and therefore, just the early warning system of energy detection and location was significant when the research pipeline had just destroyed.
Study and utilize pipeline guided wave rule, adopt pipeline sound detection technology that the pipeline running state is monitored, can carry out early warning protection to the transfer line safe operation, when pipe jar destruction or generation leakage, system detects and diagnosis automatically to pipeline damage, for the operator provides " jarring " alarm of a reflection external damage, can effectively contain artificial destruction, the harm that reduces material leakage to greatest extent and people's lives and properties and environment are caused.
Summary of the invention
Purpose of the present invention can not in time provide prewarning information in order to solve present pipe leakage method for detecting vibration exactly; can not in time locate; can not effectively contain artificial destruction; cause problems such as national wealth loss and environmental pollution; provide that a kind of to have method simple; easy to use; can accurately and timely effectively send warning message; and position; thereby effectively protect national wealth, reduced petroleum pipeline and revealed pipe jar destruction positioning system and the localization method thereof that environment is damaged based on the sound wave synergic detection.
For achieving the above object, the present invention adopts following technological scheme:
A kind of pipe jar destruction positioning system that detects based on sound wave synergic, it comprises the detection pipeline, described detection pipeline is provided with several test points, and shear wave detecting sensor and compressional wave detecting sensor, each detector sensor and host computer communication are installed on each test point.
A kind of pipe jar destruction localization method that detects based on sound wave synergic, its method be,
(1) on pipeline, several test points is set, shear wave detecting sensor and compressional wave detecting sensor is installed in each test point according to designing requirement;
(2) when unusual vibrations appear in pipeline, with shear wave and compressional wave detecting sensor on the nearest test point of jarring point the acoustic signals that receives is handled, determine the shear wave longitudinal wave propagation time difference;
(3) this time difference signal is sent into host computer, one side is compared with the database data in the host computer, determine the jarring type, and provide velocity of sound difference coefficient k, host computer utilizes formula s=k τ to the jarring point location simultaneously, wherein s is the distance of jarring point apart from the Check point sensor, and τ is the time difference that two sensors is received signal.
In the described step (2), the shear wave detecting sensor to the Signal Processing process is, it carries out signal amplification, signal filtering, A/D conversion successively with the signal that receives, and Digital Signal Processing is utilized formula s=v
2t
2, v wherein
2Be the velocity of propagation of shear wave in tube wall, t
2Be the time of sound wave arrival measuring point sensor, record shear wave due in.
In the described step (2), the compressional wave detecting sensor to the Signal Processing process is, it carries out signal amplification, signal filtering, A/D conversion successively with the signal that receives, and Digital Signal Processing is utilized formula s=v
1t
1, v wherein
1Be the velocity of propagation of compressional wave in tube wall, t
1Be the time of sound wave arrival measuring point sensor, record compressional wave due in.
When determining velocity of sound difference coefficient k in the described step (3), selected in advance jar destruction test point, the known distance of setting between jar destruction test point and test point is s
0, determine to receive the time difference τ of signal then by two sensors
0, utilize formula
Determine velocity of sound difference coefficient k.
Positioning principle of the present invention:
1 sound wave is in ducted circulation way
Pipeline is the passage of remote transportation of substances, is again simultaneously the media that information is propagated, therefore can be with it as the information channel in remote measurement and the real time fail monitoring system.When pressure piping took place to leak or is given a shock impact, vibration took place and produces sound in pipeline, and sound source is passed to environment to vibrational energy, medium is produced fluctuate, and sound just can be propagated like this, and sound is a kind of fluctuation thus.Utilize steel pipeline transaudient, can obtain compressional wave, shear wave and the Acoustic Surface Wave propagated along tube wall.
Among Fig. 2, the elastic wave propagation in the tube wall solid also can produce shear deformation except producing the volume deformation, and is therefore general except the compressional wave that can propagate compression and expand in solid, can also propagate shear wave simultaneously and be also referred to as shear wave, shear wave.In addition, the Free Surface at solid also can produce amplitude with the surface wave of decaying from case depth.
The velocity of propagation of compressional wave, shear wave and Acoustic Surface Wave is respectively when propagating in tube wall:
Longitudinal wave velocity
Transverse wave speed
The Acoustic Surface Wave ripple
Wherein, ρ is the density of solid medium, and E is the Young's modulus of solid medium, and σ is the Poisson's ratio of medium, and g is relevant with σ.Because in general solid medium, 0≤σ≤0.5 is arranged, therefore c is arranged
L/ c
T＞1, that is to say the velocity of wave of the velocity of wave of compressional wave greater than shear wave, for example, the Poisson's ratio σ of steel=0.28, longitudinal wave velocity c
L=5050m/s; Transverse wave velocity c
T=3200m/s.Because g＜1 is so acoustic surface wave propagation speed perseverance is less than the speed of shear wave.Acoustic Surface Wave is in that to leave the later decay in surface very rapid, and the degree of depth that generally is no more than several wavelength has just existed hardly.
From the mechanism of transmission of sound wave as can be known, the vibration meeting of shear wave medium particle interacts with environment, and to external radiation acoustic energy, therefore shear wave energy in the medium decays, and the compressional wave of in medium, propagating, low-frequency range (＜10kHz) to have only lowest-order waveform, the vertical wave mode of lowest-order be its most important waveform, its lateral displacement is compared much smaller with length travel, compressional wave energy so face decay are slower.For the pipeline in the actual production, the fluid in radial vibration meeting of propagating in the tube wall and support on every side or formation rock and the pipe takes place to interact and radiation acoustic energy, and it is more serious that shear wave energy is decayed; Its radial displacement was compared much smallerly when compressional wave was propagated in tube wall with length travel, and compressional wave degradation of energy speed is relatively slow.
This shows that the compressional wave in the pipeline inner fluid, the compressional wave in the tube wall and in-plant shear wave are the parameters that can characterize pipe jar, extract this signal and can be used for pipeline damage monitoring and location.
The detection of 2 sound waves and auditory localization
A kind of single-point localization method that adopts two kinds of sensor synergisms to detect on pipeline has been proposed here, at point position simultaneously according to shear wave and compressional wave detecting sensor, its measurement and positioning principle as shown in Figure 1, establishing jarring point is s apart from the distance of Check point sensor, the velocity of propagation of compressional wave in tube wall is v
1, the time that sound wave arrives the measuring point sensor is t
1, the velocity of propagation of shear wave in tube wall is v
2, the time that sound wave arrives the measuring point sensor is t
2, two sensors is received the time difference τ of signal, then
s＝v
1t
1 (5)
s＝v
2t
2 (6)
τ＝t
2-t
1 (7)
Bringing formula (5), (6) into formula (7) solves
Order
It is the coefficient relevant with velocity of sound difference, and then jarring sound source receives that apart from s and two kinds of sensors the pass of the time difference τ of signal is apart from measuring point
s＝kτ (9)
K can be according to v in the formula
1And v
2Theoretical value or experimental value substitution formula
Try to achieve.Because it is a lot of to influence the factor of the velocity of sound, ask calculation velocity of sound difference coefficient k can cause bigger error according to the velocity of sound.Here, our selected in advance jar destruction test point, shake point and measuring point apart from s
0Known, measure corresponding time difference τ again
0, just can directly obtain velocity of sound difference coefficient
The invention has the beneficial effects as follows: the velocity of sound difference coefficient that this method obtains combines the various factors influence transaudient to pipeline, has embodied a concentrated reflection of the practical working situation of pipeline, has very high Location accuracy again.Measure the method for the signal of two kinds of transmission means of same vibrations sound source with sensor synergism,, can determine the position of sound source according to the speed difference of acoustic wave propagation.The notion of velocity of sound difference coefficient is also proposed, the velocity of sound difference coefficient that the field experiment method of measurement obtains combines the various factors influence transaudient to pipeline, the practical working situation of having embodied a concentrated reflection of pipeline, experimental result shows, this method is easy and simple to handle to have very high Location accuracy again, is applicable to that the jarring of aerial pipeline detects and the location.
Description of drawings
Fig. 1 is that system of the present invention forms schematic representation;
Fig. 2 is the sound wave schematic representation of spot measurement;
The measured result figure that two sensors received when Fig. 3 hit shake at a distance for 36m;
The measured result that two sensors received when Fig. 4 hit shake at a distance for 84m;
Fig. 5 is signal processing flow figure of the present invention.
Wherein, 1. pipeline, 2. shear wave detecting sensor, 3. compressional wave detecting sensor, 4. jarring point.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
Among Fig. 1, set of systems of the present invention becomes, and it comprises detects pipeline 1, detect pipeline 1 and be provided with several test points, shear wave detecting sensor 2 and compressional wave detecting sensor 3 are installed on each test point, each detector sensor and host computer communication, communication modes can be wired or wireless mode.
Detecting method of the present invention is for as shown in Figure 5:
(1) on pipeline 1, several test points is set, shear wave detecting sensor 2 and compressional wave detecting sensor 3 is installed in each test point according to designing requirement;
(2) when unusual vibrations appear in pipeline 1, with shear wave and compressional wave detecting sensor that jarring is put on the 4 nearest test points acoustic signals that receives is handled, determine the shear wave longitudinal wave propagation time difference;
(3) this time difference signal is sent into host computer, one side is compared with the database data in the host computer, determine the jarring type, and provide velocity of sound difference coefficient k, host computer utilizes formula s=k τ to the jarring point location simultaneously, wherein s is the distance of jarring point apart from the Check point sensor, and τ is the time difference that two sensors is received signal.
In the described step (2), the shear wave detecting sensor to the Signal Processing process is, it carries out signal amplification, signal filtering, A/D conversion successively with the signal that receives, and Digital Signal Processing is utilized formula s=v
2t
2, v wherein
2Be the velocity of propagation of shear wave in tube wall, t
2Be the time of sound wave arrival measuring point sensor, record shear wave due in.
In the described step (2), the compressional wave detecting sensor to the Signal Processing process is, it carries out signal amplification, signal filtering, A/D conversion successively with the signal that receives, and Digital Signal Processing is utilized formula s=v
1t
1, v wherein
1Be the velocity of propagation of compressional wave in tube wall, t
1Be the time of sound wave arrival measuring point sensor, record compressional wave due in.
When determining velocity of sound difference coefficient k in the described step (3), selected in advance jar destruction test point, the known distance of setting between jar destruction test point and test point is s
0, determine to receive the time difference τ of signal then by two sensors
0, utilize formula
Determine velocity of sound difference coefficient k.
Fig. 2 has provided the oscillogram of single-spot testing; Fig. 3, Fig. 4 then are respectively apart from measuring point 36m, 84m and hit when shake measured result of receiving of two sensors at a distance.
Claims (4)
1. the localization method of a pipe jar destruction positioning system that detects based on sound wave synergic is characterized in that: its method is,
(1) on pipeline, several test points is set, shear wave detecting sensor and compressional wave detecting sensor is installed in each test point according to designing requirement;
(2) when unusual vibrations appear in pipeline, with shear wave and compressional wave detecting sensor on the nearest test point of jarring point the acoustic signals that receives is handled, determine the shear wave longitudinal wave propagation time difference;
(3) this time difference signal is sent into host computer, one side is compared with the database data in the host computer, determine the jarring type, and provide velocity of sound difference coefficient k, host computer utilizes formula s=k τ to the jarring point location simultaneously, wherein s is the distance of jarring point apart from the Check point sensor, and τ is the time difference that two sensors is received signal.
2. the localization method of the pipe jar destruction positioning system that detects based on sound wave synergic according to claim 1, it is characterized in that: in the described step (2), the shear wave detecting sensor to the Signal Processing process is, it carries out signal amplification, signal filtering, A/D conversion successively with the signal that receives, Digital Signal Processing is utilized formula s=v
2t
2, v wherein
2Be the velocity of propagation of shear wave in tube wall, t
2Be the time of sound wave arrival measuring point sensor, record shear wave due in.
3. the localization method of the pipe jar destruction positioning system that detects based on sound wave synergic according to claim 1, it is characterized in that: in the described step (2), the compressional wave detecting sensor to the Signal Processing process is, it carries out signal amplification, signal filtering, A/D conversion successively with the signal that receives, Digital Signal Processing is utilized formula s=v
1t
1, v wherein
1Be the velocity of propagation of compressional wave in tube wall, t
1Be the time of sound wave arrival measuring point sensor, record compressional wave due in.
4. the localization method of the pipe jar destruction positioning system that detects based on sound wave synergic according to claim 1, it is characterized in that: when determining velocity of sound difference coefficient k in the described step (3), in advance selected jar destruction test point, the known distance of setting between jar destruction test point and test point is s
0, determine to receive the time difference τ of signal then by two sensors
0, utilize formula
Determine velocity of sound difference coefficient k.
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| CN101206010B true CN101206010B (en) | 2011-06-22 |
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| CN103090194B (en) * | 2013-01-12 | 2015-07-01 | 中核华泰建设有限公司 | Underground pipeline water leakage detection method |
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| CN110109124B (en) * | 2019-05-28 | 2021-02-09 | 中国科学院声学研究所 | Device and method for sensing target at bottom of solid plate based on leaky lamb wave |
| CN113217826B (en) * | 2021-06-03 | 2022-06-14 | 邯郸市水利水电勘测设计研究院 | Pipeline water supply pipe network leakage alarm control method, device and medium |
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