CN107153097A - A kind of supersonic guide-wave for many defects detections of pipeline is segmented self-focusing detection method - Google Patents
A kind of supersonic guide-wave for many defects detections of pipeline is segmented self-focusing detection method Download PDFInfo
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Abstract
The invention belongs to field of ultrasonic nondestructive detection, especially disclose a kind of supersonic guide-wave for many defects detections of pipeline and be segmented self-focusing detection method.The technical solution adopted by the present invention is, the multistage that pipeline region to be checked is divided into suitable width along its length is interval, it can be realized supersonic guide-wave self-focusing by the way of the interval defective locations of correspondence using reversing each interval conventional detection signal structure, realize and different interval self-focusings are detected, compare each interval testing result with the signal to noise ratio of conventional Guided waves result to judge that the interval whether there is defect.The beneficial effects of the invention are as follows by being detected to the different interval self-focusings of pipeline, the detectability to multiple small defects can not only be effectively improved, and when avoiding for different point focusing, need to calculate the complex process of each channel delay parameter, effectively reduce to the point-by-point focusing scanning process in the absence of defective locations.
Description
Technical field
The invention belongs to field of ultrasonic nondestructive detection, especially disclose a kind of ultrasound for many defects detections of pipeline and lead
Wavelength-division section self-focusing detection method.
Background technology
Supersonic guide-wave has the advantages that propagation distance is remote in tubing structure, the small and sound field that decays covers whole wall thickness, special
Shi Yongyu long range, a wide range of and full structure detection be carried out to pipeline.Low-frequency range axial symmetry longitudinal mode L (0,2) is reversed
Mode T (0,1) is easy to the analysis and processing of flaw echoes, is current due to being evenly distributed along pipe circumference oriented energy
The sensed-mode that conventional Ultrasound guided wave detection technology is mainly used.Because axisymmetry mode is distributed along pipe circumference oriented energy
Even, defect reflection echo energy has direct relation with the loss of its section, when section loss is big, the energy of defect reflection echo
Greatly, and when section loss is small, defect reflection echo energy is small.In Practical Project detection, it may be deposited simultaneously in a pipeline
In multiple defects, and for the less multiple defects of section loss late, mould is detected when being used as using L (0,2) or T (0,1) mode
The energy meeting very little of its reflection echo, may be submerged among noise on time-history curves, so as to cause the missing inspection of defect during state.
Patent No. 201010610991.7, it is entitled《A kind of defect inspection based on ultrasonic guided wave focusing
Method and system》Patent by adjusting amplitude coefficient and the time delay of each channel actuation signals of guided wave phased array repeatedly, with
Change the position of supersonic guide-wave Voice segment point in the duct, repeated detection is carried out in diverse location, find defect.But it is different from
Conventional bulk wave ultrasonic phase array, the time delay of each passage of guided wave phased array and amplitude coefficient are pipeline physical dimensions, treated
Focus point, the nonlinear function for encouraging Source size and exciting signal frequency etc..It is first when carrying out Guided waves in pipe using this method
First need to set up accurate pipe detection model, calculate and treating the energy point of focus point axial location specific curvature mode guided wave
Cloth rule, or by exciting the single array element of transducer array, and treating that focus point axial location is equal along pipe circumference direction
Even to install the enough transducer arrays of array number, mode of flexural vibration guided wave energy circumferencial direction where focus point is treated is measured in experiment
The regularity of distribution；And obtain guided wave energy focusing on each passage amplitude coefficient and delay when the focus point with reference to uncoiling integration method
Time.Furthermore, the control of guided wave modal can only be realized using this type of focusing, i.e., specific curvature mode guided wave can only be focused on
Some predetermined position in the duct, and automatic focusing of the supersonic guide-wave energy in defective locations can not be realized, therefore, this method
Detection process to whole piece defect of pipeline can only take point-by-point focusing scan mode, only when defect is located exactly at leading of being adjusted
During wave energy focus point, effective testing result can be just obtained.In a word, this method is not only to each focus point amplitude coefficient and delay
The acquisition process of time is complex, and causes the plenty of time to be wasted in very the focus detection of different target position in pipe
The focusing Scanning Detctions that rejected region is not present more.
Application No. CN200610144294.0, it is entitled《The supersonic guide-wave time reversion detection dress of defect of pipeline
Put and method》In disclose a kind of use same time starting point and same widths rectangular window and obtain each passage reversion pumping signal
Method, the time-space for realizing guided wave energy in defective locations is focused on, and significantly improves the detection energy to single small defect
Power.But this method width of rectangular window in each detection is all set to fixed value, when rectangular window is wider and includes field wave
When wrapping the information between first time edge echo, for the long pipe road comprising multiple defects, multiple defect waves bags can be caused
Superposition, causes the missing inspection of defect；When rectangular window is narrower, it would be desirable to be able to prejudge and fall vacant from conventional Ultrasound Guided waves result
Sunken approximate location, to ensure the complete information that some mode reflection echo of defect is included in rectangular window, and should in Practical Project
In, the tiny flaw information included in pipe is often submerged among noise, it is difficult to extracted.
The content of the invention
The present invention overcomes the shortcomings of that prior art is present and divided there is provided a kind of supersonic guide-wave for many defects detections of pipeline
Section self-focusing detection method.The technical problem to be solved in the present invention is that region to be checked carries out segmentation self-focusing detection in pipe
When, how to control the waveform of each channel actuation signals in array, only by supersonic guide-wave self-focusing region to be checked certain section of interval
Interior defective locations, not only the mode control of supersonic guide-wave will can be realized without focusing it on pipeline other positions, i.e. this method
System, but also the self-focusing of supersonic guide-wave defective locations in the interval can be realized.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：By the way that pipeline is divided along its length
For N（N>2）Section is interval, and is corresponded to M（M>16）The conventional guided wave inspection that individual array element is encouraged simultaneously and M array element is received simultaneously
On the time-history curves that survey mode is detected, after the waveform data points of N sections of M array element receptions in interval are normalized and reversed
The pumping signal of correspondence array element is synthesized, according to sound reciprocal theorem, when including defect waves package informatin in certain section of interval excitation waveform
When, the excitation waveform of each array element transmitting will return to defective locations, so as to realize supersonic guide-wave defective bit into the interval
The self-focusing put, when certain section of interval does not have defect, Self-focusing is not present during each array element transmitting excitation waveform, so as to according to
Whether the signal to noise ratio for receiving Signal averaging result according to all array elements is better than conventional Ultrasound Guided waves result to judge certain section of interval
With the presence or absence of defect.Certain section of interval self-focusing for signal to noise ratio better than conventional Ultrasound Guided waves result detects signal, can
The detection signal is analyzed, to determine the particular location of defect in this section of interval.This method is mainly included the following steps that：
（1）Encouraged simultaneously along pipe end circumferencial direction at equal intervals using the shorter frequency narrow-band ping of the time domain of identical amplitude
M transducer array element of distribution, and each receiving channel of initial time triggering startup launched in pumping signal starts reception respectively
The echo-signal that each array element is detected, each channel reception to signal is overlapped to obtain conventional Ultrasound Guided waves result.
（2）Pipeline is divided into N sections of intervals in the region to be checked of length direction.Consider detecting instrument transmitting pumping signal when
Between and transducer near-field region influence, give up to away from excitation end pumping signal time domain width subtract pumping signal ripple bag peak value
The self-focusing that the half at moment is multiplied by corresponding to group velocity of the sensed-mode at the pumping signal centre frequency apart from inner region is examined
Survey, and using the region cut off as region to be checked starting point.Consider the influence of edge echo, the cut off in region to be checked is set
Be set to apart from pipeline other end pumping signal time domain width plus pumping signal ripple bag peak value moment be multiplied by sensed-mode swash
Encourage corresponding to the group velocity at signal center frequency at the position of length half.Since the starting point in region to be checked, led with conventional
The pumping signal duration that ripple is used when detectingGroup velocity of the sensed-mode at pumping signal centre frequency is multiplied by again to answer
Length is divided region to be checked, wherein forInteger more than 1, final stage is interval, and no matter length is less than or equal to other
Interval is separately as one section of interval.On the time-history curves that the interval divided is corresponded to conventional Ultrasound Guided waves, wherein
1st section of interval is equal to N-1 sections of siding-to-siding block lengths, and length interval N is less than or equal to other interval length.
（3）Extract and received on conventional Ultrasound Guided waves time-history curves since the 1st section of interval to N sections of intervals are each respectively
The waveform data points that channel reception is arrived, obtain M × N number of waveform data points vector, with the maximum of all waveform data points to each
Vector is normalized, and the M after normalization × N number of vector is reversed.
（4）The M data points reversed in vector corresponding to 1st section of interval are synthesized into M pumping signal difference
Each self-corresponding array element is encouraged simultaneously, and the initial time triggering launched in pumping signal starts each receiving channel and starts to connect respectively
The echo-signal that each array element is detected is received, the signal that each receiving channel is received is overlapped as to the 1st section of interval autohemagglutination
The result of Jiao's detection；Similarly, 2 ~ N sections of interval self-focusing testing results are respectively obtained.
（5）1st section to N sections interval self-focusing testing results are analyzed, when certain section of interval self-focusing detection knot
When the signal to noise ratio of fruit is better than conventional Ultrasound Guided waves result, it is believed that existing defects in the interval, by the interval autohemagglutination
Burnt testing result is analyzed, it may be determined that the particular location of defect；Otherwise, it can determine that and defect be not present in this section of interval.
The present invention has following beneficial effect compared with prior art：
1. automatic focus on, calculate simple.Compared with prior art, the present invention is realized only is autofocusing at certain section by supersonic guide-wave
Defective locations in interval, both avoid the complex process for calculating each channel delay parameter, reduce and lack to being not present in pipe again
Fall into the point-by-point focusing Scanning Detction process at position.
2. segmentation detection, detectability is high.Compared with prior art, the present invention can both avoid multiple defect waves bags in pipeline
The missing inspection for being superimposed and causing, can overcome needs to sentence the small defect reflection echo ripple bag substantially position known and be submerged among noise in advance again
The shortcoming put, longer and there is the pipeline of many places defect for length, the present invention is remarkably improved to multiple small defects in pipe
Detectability.
Brief description of the drawings
Fig. 1 is that a kind of supersonic guide-wave for many defects detections of pipeline is segmented self-focusing detection method flow chart；
Fig. 2 is the conventional Ultrasound Guided waves and segmentation self-focusing detection data acquisition schematic diagram of the present invention；
Fig. 3 is the conventional Ultrasound Guided waves containing double defect trackings 1 and is segmented self-focusing testing result using the present invention；Its
In：（a）Conventional Ultrasound Guided waves result；（b）1st interval self-focusing testing result；（c）2nd interval self-focusing testing result；
（d）3rd interval self-focusing testing result；（e）4th interval self-focusing testing result；（f）5th interval self-focusing testing result；
Fig. 4 is containing double conventional Ultrasound Guided waves of defect tracking 2 and using present invention segmentation self-focusing testing result, wherein the 1st
Individual defect is located exactly at the 2nd, 3 interval intersections：（a）Conventional Ultrasound Guided waves result；（b）1st interval self-focusing detection knot
Really；（c）2nd interval self-focusing testing result；（d）3rd interval self-focusing testing result；（e）4th interval self-focusing detection knot
Really；（f）5th interval self-focusing testing result；
Fig. 5 is containing the conventional Ultrasound Guided waves of three defect tracking 3 and using present invention segmentation self-focusing testing result：（a）It is conventional
Ultrasonic guided wave detecting result；（b）1st interval self-focusing testing result；（c）2nd interval self-focusing testing result；（d）3rd is interval
Self-focusing testing result；（e）4th interval self-focusing testing result；（f）5th interval self-focusing testing result.
Embodiment
With reference to the accompanying drawings and examples, the embodiment to the present invention is described in further detail, and is implemented below
Example is used to illustrate the present invention, but is not limited to the scope of the present invention.
A kind of supersonic guide-wave for many defects detections of pipeline is segmented self-focusing detection method flow chart as shown in Figure 1,
Can progressively it be carried out according to flow shown in Fig. 1 in the specific implementation process of this method.
If Fig. 2 is the conventional Ultrasound Guided waves and segmentation self-focusing detection data acquisition schematic diagram of the present invention.Under
Face combines when Fig. 2 introduces each section of interval self-focusing detection the acquisition methods of pumping signal and i-th (1≤i≤N) section interval is carried out
The process of self-focusing detection.In conventional Ultrasound Guided waves, to inspire transducing in low order axisymmetry mode, driving array 1
1 ~ M of device array element signal V1(t)~VM(t) it need to simultaneously load and be changed in the pumping signal of the shorter frequency arrowband of identical time domain, array 2
1 ~ M of energy device array element receives 1 ~ M of transducer array element correspondences in the reflection echo signal of multiple defects and end face, array 2 simultaneously respectively
Reception signal be represented by R respectively1(t)~RM(t), the stack result of all transducer array elements reception signals is in array 2
Conventional Ultrasound Guided waves result.The acquisition methods of pumping signal during each section of interval self-focusing detection：Each receive is extracted respectively to lead to
To N sections of interval reception waveform data points since the 1st section on road time-history curves, M × N number of waveform data points vector is obtained,
Each vector is normalized with the maximum of waveform data points, interval corresponding to i-th (1≤i≤N), 1 ~ M passages connect
Waveform data points are expressed as W after the normalization of receiptsi1(t)~WiM(t).Self-focusing detection is carried out to i-th (1≤i≤N) section interval
Process：By waveform data points W after the normalization of the interval upper 1 ~ M receiving channels of i-th (1≤i≤N)i1(t)~WiM(t) backward is carried out
V is can obtain after arrangementi1(t)~ViM(t), using Vi1(t)~ViM(t) waveform data points in are encouraged in array 2 simultaneously respectively
1 ~ M array element in 1 ~ M array element, array 1 receives signal and is represented by Ri1(t)~ RiM(t), all reception Signal averaging knots
Fruit is the interval self-focusing testing result of i-th (1≤i≤N) section.
Embodiment 1：Steel pipeline 1, density of material is, modulus of elasticity is, Poisson's ratio
For 0.286543.The a length of 2.1m of pipeline, external diameter is 70mm, and internal diameter is 63mm.In 0.7m, 1.5m punishment away from pipeline end face 1
The penetrating crackle of two formed objects is not provided with, crack width is 2mm, along the circumferential direction extended corner is 8o.Its specific detection step
Suddenly it is：
（1）Centre frequency is used to add Hanning window modulated sinusoid to believe as the excitation of conventional Guided waves for 100kHz 3 cycles
Number, load it in 48 array elements being distributed uniformly and circumferentially in pipeline end face, extract away from the axial distance of pipeline end face 1
Information on 2.5mm, circumferential angle 48 array nodes of identical is as echo-signal, by returning that 48 array nodes are received
After ripple Signal averaging as conventional Ultrasound Guided waves result, shown in testing result such as Fig. 3 (a).
（2）The region to be checked of pipeline 1 is divided into 5 intervals to be checked along its length, each interval to be checked is on time-history curves
The interval that dotted line is divided is erected in corresponding position such as Fig. 3 (a).Because 3 cycles that centre frequency is 100kHz add Hanning window to adjust
Sine wave exciting signal time domain width processed is 30us, and the time to peak of pumping signal appears in 13us, for wall thickness 3.5mm
Group velocity of steel pipe L (0,2) the mode guided wave in 100kHz be 5.33mm/us, it is considered to detecting instrument transmitting pumping signal when
Between and transducer near-field region influence, give up away from the length of pipeline end face 1 for 125.3mm scope inner regions self-focusing examine
Survey, and using the region cut off as region to be checked starting point.Consider the influence of edge echo, the cut off in region to be checked is set
It is at 114.6mm to be set to away from the length of end face 22.Believed since area starting point to be checked with L (0,2) mode guided wave ripple bag in excitation
2.5 times of institute's propagation distance are divided in number time domain width time, 4 intervals that length is 400mm are obtained, at the 4th
Interval cut off is 260mm interval to also there is a segment length between region cut off to be checked, interval using the interval as the 5th.
Due to calculating when defect or endface position, when subtracting pumping signal ripple bag peak value with defect or edge echo ripple bag peak value moment
The time difference at quarter is multiplied by group velocity of the sensed-mode at pumping signal centre frequency to calculate defect or endface position, therefore,
By 1 ~ 5 section it is interval rise, stop is corresponded on time-history curves when, need to by it is each it is interval rise, distance of the stop away from end face 1 divided by
It is bent as time-histories at the time of along with pumping signal ripple bag peak value correspondence after group velocity of L (0,2) the mode guided wave in 100kHz
On line it is each it is interval rise, stop.
（3）From the time-history curves of the conventional Guided waves of 48 array nodes, extract respectively corresponding to the 1st ~ 5 section of interval
48 × 5 waveform data points vectors, are reversed respectively after it is normalized with maximum.
（4）Corresponding 48 waveform data points reversed in 1st section of interval are encouraged into corresponding array element respectively, and synchronously
Data in the collection array element of array 2 are overlapped, as the 1st section of interval self-focusing testing result, shown in such as Fig. 3 (b).Using
Identical method, respectively obtains the 2nd section, the 3rd section, the 4th section, the 5th section of interval self-focusing testing result, respectively as Fig. 3 (c),
Shown in Fig. 3 (d), Fig. 3 (e), Fig. 3 (f).
（5）It was found from detection and analysis, the signal to noise ratio of the 2nd and 4 region self-focusing testing results is examined better than conventional Ultrasound guided wave
Result is surveyed, and the signal to noise ratio of the interval self-focusing testing result in the 1st, 3 and 5 is less than conventional Ultrasound Guided waves result, thus judges 2
Interval and the 4th interval existing defects.According to the propagation time of Fig. 3 (c) medium wave bags and L (0,2) mode guided wave in 100kHz
Group velocity, it is 699.56mm away from pipeline end face 1 that can calculate defective locations in the interval, and the position of end face 22 is away from pipeline end face
One 1 be 2093.36m, is 0.06%, 0.32% with deviations of actual position.It is hereby understood that when to the 2nd interval progress self-focusing detection
When, the defective locations and endface position that can be accurately detected in the interval.According to the propagation time of Fig. 3 (e) medium wave bags and L
Group velocity of (0,2) the mode guided wave in 100kHz, can calculate defective locations in the interval is away from pipeline end face 1
1493.73mm, the position of end face 22 is 2092.03m away from pipeline end face 1, is 0.42%, 0.38% with deviations of actual position.So as to
Understand, when to the 4th interval progress self-focusing detection, can accurately detect defective locations and the end face position being located in the interval
Put.
Embodiment 2：Steel pipeline 2, density of material is, modulus of elasticity is,
Poisson's ratio is 0.286543.The a length of 2.1m of pipeline, external diameter is 70mm, and internal diameter is 63mm.The 0.925m away from pipeline end face 1,
The penetrating crackle of two formed objects is had at 1.5m, crack width is 2mm, along the circumferential direction extended corner is 8o.
（1）Centre frequency is used to add Hanning window modulated sinusoid swashing as conventional Guided waves for 100kHz 3 cycles
Encourage signal, load it 48 array elements being distributed uniformly and circumferentially in pipeline end face 1, extract away from end face 1 axially away from
From 2.5mm, circumferential angle 48 array element of identical information as echo-signal, the echo-signal that 48 array nodes are received
As conventional Ultrasound Guided waves result after superposition, shown in such as Fig. 4 (a).
（2）The region to be checked of pipeline 1 is divided into 5 intervals to be checked along its length, each interval to be checked is on time-history curves
Corresponding position in Fig. 4 (a) as erected shown in dotted line.Because 3 cycles that centre frequency is 100kHz add Hanning window modulated sinusoid
Pumping signal time domain width is 30us, and the time to peak of pumping signal appears in 13us, for wall thickness 3.5mm steel pipes L (0,
2) group velocity of the mode guided wave in 100kHz is 5.33mm/us, it is considered to the time of detecting instrument transmitting pumping signal and transducing
The influence of device near-field region, gives up and is detected away from the length of pipeline end face 1 for the self-focusing of 125.3mm scope inner regions, and should
Region cut off as region to be checked starting point.Consider the influence of edge echo, the cut off in region to be checked is set as away from end
The length of face 22 is at 114.6mm.Since area starting point to be checked with L (0,2) mode guided wave ripple bag in pumping signal when field width
Spend institute's propagation distance in the time 2.5 times are divided, and obtain 4 intervals that length is 400mm, in the 4th interval section
Stop is 260mm interval to also there is a segment length between the cut off in region to be checked, interval using the interval as the 5th.Due to
When calculating defect or endface position, pumping signal ripple bag peak value moment is subtracted with defect or edge echo ripple bag peak value moment
Time difference is multiplied by group velocity of the sensed-mode at pumping signal centre frequency to calculate defect or endface position, therefore, by 1
When ~ 5 sections interval to be risen, stop is corresponded on time-history curves, need to by it is each it is interval rise, distance of the stop away from end face 1 divided by L (0,
2) after group velocity of the mode guided wave in 100kHz, as on time-history curves at the time of along with pumping signal ripple bag peak value correspondence
It is each it is interval rise, stop.
（3）From the time-history curves of the conventional Guided waves of 48 nodes, extract respectively corresponding to the 1st ~ 5 section of region 48 ×
5 waveform data points vectors, are reversed respectively after it is normalized by maximum.
（4）Corresponding 48 waveform data points reversed in 1st section of interval are encouraged into corresponding array element respectively, and synchronously
Data in the collection array element of array 2 are overlapped, as the 1st section of interval self-focusing testing result, shown in such as Fig. 4 (b).Using
Identical method, respectively obtains the 2nd section, the 3rd section, the 4th section, the 5th section of interval self-focusing testing result, respectively as Fig. 4 (c),
Shown in Fig. 4 (d), Fig. 4 (e), Fig. 4 (f).
（5）It was found from detection and analysis, the signal to noise ratio of the 3rd and 4 interval self-focusing testing results is better than conventional Guided waves, and
The signal to noise ratio of the interval self-focusing of 1st, 2 and 5 testing result is less than conventional Guided waves, thus judges that the 3rd and 4 intervals are present and lacks
Fall into.According to the propagation time of Fig. 4 (c) medium wave bags and the group velocity of L (0,2) mode guided wave, can calculate in the interval defect away from
Pipeline end face 1 is 928.75mm, and end face 22 is 2092.03mm away from pipeline end face 1, with actual error 0.41%, 0.38%.
It is hereby understood that when being detected to the 3rd interval self-focusing, because the 3rd interval contains L (0,2) mould of previous flaw echo bag
The state second half section part and the high-order mode of flexural vibration information close with L (0,2) modal velocity, have large energy when self-focusing is detected
Guided wave can focus to defective locations automatically, can more accurately detect be located at the interval and previous interval border position at defect
With the position of end face 22.According to the propagation time of Fig. 4 (e) medium wave bags and the group velocity of L (0,2) mode guided wave, this can be calculated
Defect is 1496.4mm away from pipeline end face 1 in interval, and end face 22 is 2090.69mm away from pipeline end face 1, with actual error
0.24%、0.44%.It is hereby understood that when to the 4th interval progress self-focusing detection, can accurately detect to be located in the interval
Defect and endface position.
Embodiment 3：Steel pipeline 3, density of material is, modulus of elasticity is, pool
Pine is than being 0.286543.The a length of 2.1m of pipeline, external diameter is 70mm, and internal diameter is 63mm.In 0.6m, 1.1m away from pipeline end face 1
It is respectively 2mm, 2.5mm, 3mm through hole that place, 1.5m, which have three diameters,.
（1）Centre frequency is used to add Hanning window modulated sinusoid swashing as conventional Guided waves for 100kHz 3 cycles
Signal is encouraged, is loaded it in 48 array nodes being distributed uniformly and circumferentially in pipeline end face 1, is extracted and end face 1
Information on axial distance 2.5mm, circumferential angle 48 array nodes of identical connects 48 array nodes as echo-signal
As conventional Ultrasound Guided waves result after the echo-signal superposition of receipts, shown in such as Fig. 5 (a).
（2）The region to be checked of pipeline 1 is divided into 5 intervals to be checked along its length, each interval to be checked is on time-history curves
Corresponding position in Fig. 5 (a) as erected shown in dotted line.Because 3 cycles that centre frequency is 100kHz add Hanning window modulated sinusoid
Pumping signal time domain width is 30us, and the time to peak of pumping signal appears in 13us, for wall thickness 3.5mm steel pipe L
Group velocity of (0,2) the mode guided wave in 100kHz is 5.33mm/us, it is considered to which detecting instrument is launched the time of pumping signal and changed
The influence of energy device near-field region, gives up and is detected away from the length of pipeline end face 1 for the self-focusing of 125.3mm scope inner regions, and will
The region cut off as region to be checked starting point.Consider edge echo influence, by the cut off in region to be checked be set as away from
The length of end face 22 is at 114.6mm.With L (0,2) mode guided wave ripple bag in pumping signal time domain since area starting point to be checked
2.5 times of institute's propagation distance are divided in spaced time, obtain 4 intervals that length is 400mm, interval at the 4th
Cut off is 260mm interval to also there is a segment length between the cut off in region to be checked, interval using the interval as the 5th.By
When defect or endface position is calculated, pumping signal ripple bag peak value moment is subtracted with defect or edge echo ripple bag peak value moment
Time difference group velocity of the sensed-mode at pumping signal centre frequency is multiplied by calculate defect or endface position, therefore,
By 1 ~ 5 section it is interval rise, stop is corresponded on time-history curves when, need to by it is each it is interval rise, distance divided by L of the stop away from end face 1
It is bent as time-histories at the time of along with pumping signal ripple bag peak value correspondence after group velocity of (0,2) the mode guided wave in 100kHz
On line it is each it is interval rise, stop.
（3）From the time-history curves of the conventional Guided waves of 48 array nodes, extract respectively corresponding to the 1st ~ 5 section of region
48 × 5 waveform data points vectors, are reversed respectively after it is normalized by maximum.
（4）Corresponding 48 waveform data points reversed in 1st section of interval are encouraged into corresponding array element respectively, and will be same
Data on step collection receiving array node are overlapped, as the result of the 1st section of interval self-focusing detection, such as Fig. 5 (b) institutes
Show.Using identical method, the 2nd section, the 3rd section, the 4th section, the 5th section of interval self-focusing result are respectively obtained, respectively such as Fig. 5
(c), shown in Fig. 5 (d), Fig. 5 (e), Fig. 5 (f).
（5）It was found from detection and analysis, the signal to noise ratio of the interval self-focusing of the 2nd, 3 and 4 testing result is better than conventional Guided waves
As a result, and the signal to noise ratio of the 1st and 5 interval self-focusing testing results is less than conventional Guided waves result, thus judge the 2nd, 3 and 4
Interval existing defects.According to the propagation time of Fig. 5 (c) medium wave bags and the group velocity of L (0,2) mode guided wave, the area can be calculated
In defect away from pipeline end face 1 be 601.44mm, end face 22 away from pipeline end face 1 be 2097mm, with actual error 0.24%,
0.14%.It is hereby understood that when to the 2nd interval progress self-focusing detection, can accurately detect the defective bit being located in the interval
Put and the position of end face 22.According to the propagation time of Fig. 5 (d) medium wave bags and the group velocity of L (0,2) mode guided wave, it can calculate and fall vacant
Fall into away from pipeline end face 1 be 1098.17mm, end face 22 away from pipeline end face 1 be 2097mm, with actual error 0.17%,
0.14%.It is hereby understood that when to the 3rd interval progress self-focusing detection, can accurately detect the defective bit being located in the interval
Put and endface position.According to the propagation time of Fig. 5 (e) medium wave bags and the group velocity of L (0,2) mode guided wave, the area can be calculated
Interior defect is 1498.23mm away from pipeline end face 1, and end face 22 is 2095.64mm away from pipeline end face 1, with actual error
0.12%、0.21%.It is hereby understood that when to the 4th interval progress self-focusing detection, can accurately detect to be located in the interval
Defective locations and endface position.
In summary, a kind of supersonic guide-wave segmentation self-focusing detection method for many defects detections of pipeline of the invention is adopted
Technical scheme is that pipeline region to be checked is divided into multiple intervals along its length, respectively believes each interval corresponding echo
Number global normalization and the pumping signal after reversing as each array element are carried out, realized supersonic guide-wave self-focusing in the interval
Interior defective locations.This method can realize that one-time detection carries out self-focusing detection to the defect in pipeline in one section of interval, keep away
The shortcoming of point-by-point focusing scanning is exempted from.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, although with reference to foregoing reality
Apply example the present invention is described in detail, for those skilled in the art, it still can be to foregoing each implementation
Technical scheme described in example is modified, or equivalent substitution, all essences in the present invention are carried out to which part technical characteristic
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (4)
1. a kind of supersonic guide-wave for many defects detections of pipeline is segmented self-focusing detection method, it is characterised in that including following
Step：
（1）Encouraged simultaneously along pipe end circumferencial direction at equal intervals using the shorter frequency narrow-band ping of the time domain of identical amplitude
M transducer array element of distribution, and each receiving channel of initial time triggering startup launched in pumping signal starts reception respectively
The echo-signal that each array element is detected, the echo-signal that each receiving channel is received is overlapped, and obtains conventional Ultrasound
Guided waves time-history curves；
（2）Pipeline is divided into N sections of intervals in the region to be checked of length direction, the N sections of interval corresponded to described（1）In step
On the conventional Ultrasound Guided waves time-history curves；
（3）The received wave of each passage in the 1st section of interval to N sections of intervals on conventional Ultrasound Guided waves time-history curves is extracted respectively
Figurate number strong point, is obtained M × N number of waveform data points vector, each vector is normalized with the maximum of all waveform data points
Processing, and M × N vector after normalized is reversed；
（4）Data point in M inverted order arrangement vector corresponding to 1st section of interval is synthesized into M pumping signal respectively simultaneously
Each self-corresponding array element is encouraged, and the initial time triggering launched again in pumping signal starts each receiving channel and starts to connect respectively
The echo-signal that each array element is detected is received, each channel reception to echo-signal is overlapped and is used as the 1st section of interval self-focusing inspection
Survey result；Similarly, 2 ~ N sections of interval self-focusing testing results are respectively obtained；
（5）The self-focusing testing results interval to the 1st section to N sections are analyzed, when certain section of interval self-focusing testing result
When signal to noise ratio is better than conventional Ultrasound Guided waves result, it is believed that existing defects in the interval, by being examined to the interval self-focusing
Survey result to be analyzed, it may be determined that the particular location of defect in this section of interval；Otherwise, it can determine that to be not present in this section of interval and lack
Fall into.
2. a kind of supersonic guide-wave for many defects detections of pipeline as claimed in claim 1 is segmented self-focusing detection method, its
It is characterised by：By when distance arrays installation end face length is that pumping signal time domain width subtracts pumping signal ripple bag peak value on pipeline
The half at quarter is multiplied by corresponding to group velocity of the sensed-mode at the pumping signal centre frequency at the position of distance as the step
Suddenly（2）In region to be checked starting point, it apart from pipeline tail end length is pumping signal time domain width that the terminal in the region to be checked, which is,
Distance one corresponding to group velocity of the sensed-mode at the pumping signal centre frequency is multiplied by plus pumping signal ripple bag peak value moment
At half position.
3. a kind of supersonic guide-wave for many defects detections of pipeline as claimed in claim 1 or 2 is segmented self-focusing detection method,
It is characterized in that：Since the starting point in region to be checked, the pumping signal duration used during with conventional Guided waves<math display = 'block'>
<mrow>
<mi>n</mi>
<mo>&sol;</mo>
<mn>2</mn>
</mrow>
</math>
It is multiplied by again
Length corresponding to group velocity of the sensed-mode at the pumping signal centre frequency is divided to region to be checked, wherein<math display = 'block'>
<mrow>
<mi>n</mi>
</mrow>
</math>
To be big
In 1 integer, no matter length is less than or equal to other interval length separately as one section to final stage；Wherein the 1st section area
Between it is equal to N-1 sections of siding-to-siding block lengths, N sections of siding-to-siding block lengths are less than or equal to other intervals.
4. a kind of supersonic guide-wave for many defects detections of pipeline as claimed in claim 1 is segmented self-focusing detection method, its
It is characterised by：The number M of the array element being spacedly distributed along pipe end circumferencial direction>16.
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| CN108663434A (en) * | 2018-04-26 | 2018-10-16 | 中国能源建设集团安徽电力建设第工程有限公司 | A kind of coarse grain material total focus detection method of phased array supersonic defectoscope |
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Application publication date: 20170912 |