CN105136074A - Method for extracting end face signal of vertical column at highway on the basis of a guided wave phase characteristic - Google Patents
Method for extracting end face signal of vertical column at highway on the basis of a guided wave phase characteristic Download PDFInfo
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- CN105136074A CN105136074A CN201510556523.9A CN201510556523A CN105136074A CN 105136074 A CN105136074 A CN 105136074A CN 201510556523 A CN201510556523 A CN 201510556523A CN 105136074 A CN105136074 A CN 105136074A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 11
- 238000010790 dilution Methods 0.000 claims description 4
- 239000012895 dilution Substances 0.000 claims description 4
- 230000005284 excitation Effects 0.000 claims description 4
- 230000010363 phase shift Effects 0.000 claims description 4
- 238000009659 non-destructive testing Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000005086 pumping Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 201000004569 Blindness Diseases 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006854 communication Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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Abstract
The invention discloses a method for extracting an end face signal of a vertical column at a highway on the basis of a guided wave phase characteristic. The method is characterized by comprising the following steps of: (1) acquiring a vertical column detection signal by means of guided wave nondestructive detection technology; (2) intercepting the detection signal in order to obtain a signal to be matched, and performing sparse decomposition on the signal to be matched by using a sparse decomposition algorithm in order to obtain a matching atom set; (3) according to a characteristic that an end face echo signal and a drive pulse signal have inverted phases, performing phase detection on the matching atom set so as to obtain a matching atom of an end face echo; and (4) reconstructing the obtained matching atom in order to obtain an end face echo characteristic signal. The method may automatically extract the end face echo characteristic signal from the detection signal with a low signal-to-noise ratio and multiple superposed signals, reduces guided wave signal processing difficulty, and has practical engineering application value.
Description
Technical field
The present invention relates to traffic safety facilities field of non destructive testing, particularly relate to a kind of highway column end face method for extracting signal based on guided wave phase propetry.
Background technology
Freeway guardrail is as the important leverage of traffic safety, can effectively slow down the speed of a motor vehicle when there is traffic hazard, preventing vehicle from going out road surface or drive towards subtend track thus avoid causing secondary traffic accident, be called as " the last item securing band of driver ".The column buried depth caused due to the corrosion etc. in the operation lack of standardization (using inferior materials and turning out substandard goods) of unit in charge of construction in work progress, severe geologic media becomes the major hidden danger of traffic safety not.Highway guard rail upright post belongs to concealed work, and traditional detection method adopts the pile pulling damaged to detect, and it not only destroys the integrality of side slope and roadbed, and wastes time and energy, and has secondary buried depth problem.Current high speed highway guardrail upright post Dynamic Non-Destruction Measurement has obtained certain Research foundation, wave propagation characteristic, detection system and sensor special etc. are studied, such as " Special sensor clamp for ultrasonic guided-wave detection of guardrail upright column on expressway development ", " the high speed highway guardrail upright post buried depth detection method research based on wave velocity method " and " the high speed highway guardrail upright post buried depth based on guided wave technology detects ".In actual detection, for being covered with concrete buried column, because concrete place echoed signal is obvious, noise, Signal averaging etc. that detection signal is introduced after multiple reflections cause end face signal location to be difficult to judge, thus be difficult to the buried depth judging column, propose a kind of highway column end face method for extracting signal based on guided wave phase propetry for this reason, facilitate the judgement of column buried depth.
For road upright column, if by pumping signal s
it () produces T (0,1) mode guided wave in column, run into acoustic impedance in communication process when changing, such as column end face, guided wave signals will reflect, and the time domain waveform of its echo (reflection) signal can be expressed as:
in formula, S
i(ω) be s
ifourier's change of (t), R (ω) is reflection coefficient, and its expression formula can be expressed as: R (ω)=| R (ω) | e
j θ (ω), in formula | R (ω) | reflect the amplitude of echoed signal and the change of phase place with θ (ω).Visible, echoed signal is that amplitude and phase place there occurs change relative to guided wave incoming signal.Again, the reflection coefficient of column end guided wave echoed signal is: suppose column there is a groove, and its place tube wall area of section is A
2, then groove acoustic impedance is Z
2=ρ
1v
1a
2, then groove reflection coefficient is:
the end face of column can regard the area of section A of groove as
2the situation of → 0, then end reflection coefficient is:
show that end guided wave signals is all reflected, therefore edge echo and pumping signal phase differential are:
θ=arctan (Im/Re)=| θ
re-θ
in|=(2k+1) π, θ in formula
re, θ
inbe respectively the phase place of edge echo signal and incoming signal.Namely column end face echoed signal and incoming signal anti-phase.
Summary of the invention
The present invention is directed to the defect of prior art in background technology, provide the highway column end face method for extracting signal based on guided wave phase propetry.
In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals:
Based on the highway column end face method for extracting signal of guided wave phase propetry, comprise the steps:
(1) detected by Guided Wave NDT Technique column, obtain column guided wave detection signal;
(2) intercepting process is carried out to Guided waves signal and obtain signal to be matched, utilize Its Sparse Decomposition algorithm to treat matched signal and carry out dilution decomposition, obtain matched atoms collection;
(3) according to column end face echoed signal and the anti-phase phase propetry of excitation pulse signal, phase-shift detection is carried out to gained matched atoms collection, extract the matched atoms obtaining edge echo;
(4) gained matched atoms is reconstructed, thus obtains edge echo characteristic signal.
As a kind of preferred version, the described Guided Wave NDT Technique of step (1) adopts T (0,1) torsion mode guided wave.
The present invention, owing to have employed above technical scheme, has following beneficial effect:
The present invention is by the guided wave phase propetry of highway column edge echo, can realize fast automatically extracting edge echo signal the detection signal of, signal multiple stacking low from signal to noise ratio (S/N ratio), conveniently judge the buried depth of highway column, reduce the pile pulling of column blindness and detect the tremendous economic cost brought, there is obvious applied economics meaning.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the highway column end face method for extracting signal process flow diagram that the present invention is based on guided wave phase propetry;
Fig. 2 is that the present invention gets pulse width σ=4e-4, phase theta=0rad, centre frequency f
cthe Gabor driving pulse waveform of=128KHz and spectrogram;
Fig. 3 is that the present invention is detected by Guided Wave NDT Technique column, gained column guided wave detection signal;
Fig. 4; For removing initial blind area signal to gained column guided wave detection signal and exceeding the signal to be matched of external signal gained of embedding regulation;
Fig. 5 is that the present invention carries out dilution decomposition, gained matched atoms collection waveform by treating matched signal based on the matching pursuit algorithm crossing complete Gabor dictionary;
Fig. 6 carries out phase-shift detection by the phase relation of edge echo and pumping signal to gained atom collection, and gained end face matched atoms is through the end surface features signal of reconstruct gained;
Fig. 7 is to gained residual signals after original signal Its Sparse Decomposition;
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, and following examples are explanation of the invention and the present invention is not limited to following examples.
Embodiment 1:
The present embodiment is for concrete buried column, and gained Guided waves signal is carried out to automatic identification and the extraction of edge echo characteristic signal by phase propetry, implementation process is as follows:
1) institute's survey highway column parameter is: external diameter 140mm, wall thickness 4.5mm, pipe range 2.150m, buried depth 1.20m, and Guided waves transducer is arranged on distance h=0.54m place, earth's surface;
2) pumping signal for Guided waves adopts following formula Gabor pulse signal, and phase place is taken as=0rad, and frequency is 128kHz.In column, T (0,1) the mode guided wave with good time-frequency characteristic is inspired by Guided waves transducer:
σ, f in formula
cpulse width, centre frequency and phase place is respectively with θ.Figure 2 shows that σ=4e-4, θ=0rad, f
cthe driving pulse waveform of=128KHz and spectrogram;
3) pumping signal parameter is set by Guided Wave NDT Technique, this column is detected, obtain column guided wave detection signal as shown in Figure 3;
4) intercepting process is carried out to Guided waves signal and obtain signal to be matched, according to the position h=0.54m of the concrete layer distance transducer recorded, remove blind area signal; Consult the standard size that " expressway traffic safety facilities design details JTG/TD81-2006 " obtain surveyed type column, get certain surplus length, obtain the signal to be matched of Fig. 4; To adopt based on the matching pursuit algorithm of Gabor dictionary as Its Sparse Decomposition algorithm, treat matched signal and carry out dilution decomposition, through 4 these iteration, 4 matched atoms waveforms and Fig. 7 residual signals shown in the collection of matched atoms shown in following table parameter, Fig. 5;
According to column end face echoed signal and the anti-phase phase propetry of excitation pulse signal, carry out phase-shift detection to gained matched atoms collection, in observation, matched atoms g known by table
2phase place be 3.110 (rad), contrary with excitation pulse signal (θ=0rad) phase place, be the matched atoms of edge echo;
Verify further, by column end face Signal Matching atom g
2time shifting parameter u (s) and guided wave speed v=3180m/s, bring formula l=|u × v/2-h| into, trying to achieve buried depth is l=1.209m, and this conforms to actual 1.20m, demonstrates the correctness of this method.
(6) to gained matched atoms g
2be reconstructed, thus obtain edge echo characteristic signal as shown in Figure 6.
In addition, it should be noted that, the specific embodiment described in this instructions, the shape, institute's title of being named etc. of its parts and components can be different.All equivalences of doing according to structure, feature and the principle described in inventional idea of the present invention or simple change, be included in the protection domain of patent of the present invention.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment; only otherwise depart from structure of the present invention or surmount this scope as defined in the claims, protection scope of the present invention all should be belonged to.
Claims (2)
1., based on the highway column end face method for extracting signal of guided wave phase propetry, its feature comprises the steps:
(1) detected by Guided Wave NDT Technique column, obtain column guided wave detection signal;
(2) intercepting process is carried out to Guided waves signal and obtain signal to be matched, utilize Its Sparse Decomposition algorithm to treat matched signal and carry out dilution decomposition, obtain matched atoms collection;
(3) according to column end face echoed signal and the anti-phase phase propetry of excitation pulse signal, phase-shift detection is carried out to gained matched atoms collection, extract the matched atoms obtaining edge echo;
(4) gained matched atoms is reconstructed, thus obtains edge echo characteristic signal.
2. the highway column end face method for extracting signal based on guided wave phase propetry according to claim 1, is characterized in that: described Guided Wave NDT Technique adopts T (0,1) torsion mode guided wave column to carry out Non-Destructive Testing; Described Its Sparse Decomposition algorithm adopts the matching pursuit algorithm based on crossing complete Gabor dictionary.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124633A (en) * | 2016-08-21 | 2016-11-16 | 安徽科技学院 | The method of deploying of guided wave signals repeatedly roundtrip in pipeline |
| CN106370734A (en) * | 2016-08-21 | 2017-02-01 | 安徽科技学院 | Method for extracting end surface reflection signal in ultrasonic guided-wave detection of pipeline |
| CN108375356A (en) * | 2018-03-12 | 2018-08-07 | 交通运输部公路科学研究所 | The strut length of guardrail determines method, apparatus and computer readable storage medium |
-
2015
- 2015-09-04 CN CN201510556523.9A patent/CN105136074B/en active Active
Non-Patent Citations (2)
| Title |
|---|
| 柳伟续等: "《基于ISMP 的高速公路护栏立柱导波检测》", 《计算机工程》 * |
| 郑国军等: "《基于匹配追踪算法的超声导波》", 《机械工程学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124633A (en) * | 2016-08-21 | 2016-11-16 | 安徽科技学院 | The method of deploying of guided wave signals repeatedly roundtrip in pipeline |
| CN106370734A (en) * | 2016-08-21 | 2017-02-01 | 安徽科技学院 | Method for extracting end surface reflection signal in ultrasonic guided-wave detection of pipeline |
| CN108375356A (en) * | 2018-03-12 | 2018-08-07 | 交通运输部公路科学研究所 | The strut length of guardrail determines method, apparatus and computer readable storage medium |
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