CN111157624B - Method for diagnosing damage state of inner bore of pipeline - Google Patents
Method for diagnosing damage state of inner bore of pipeline Download PDFInfo
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- CN111157624B CN111157624B CN202010062603.XA CN202010062603A CN111157624B CN 111157624 B CN111157624 B CN 111157624B CN 202010062603 A CN202010062603 A CN 202010062603A CN 111157624 B CN111157624 B CN 111157624B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
Abstract
The invention relates to the field of nondestructive detection of pipelines, in particular to a method for diagnosing damage states of inner bores of pipelines. The ultrasonic electromagnetic ultrasonic excitation end sends a signal to the bore of the detected pipeline, and the ultrasonic electromagnetic ultrasonic receiving end acquires a reflected signal. And establishing a waveform database, wherein the waveform database comprises the non-damage waveform and the damage waveform of the pipeline. And comparing the waveform corresponding to the reflected signal with the waveform in the waveform database, and if the waveform corresponding to the reflected signal is identical with the damage waveform, determining that the detected pipeline is the damaged pipeline in the inner bore. The location is impaired by time and speed of signal propagation. And acquiring the damage size of the damaged pipeline in the bore through the amplitude of the damage reflection signal. The diagnosis method disclosed by the invention is suitable for detecting and identifying the defects of various complex structures of the inner wall of the thick-wall pipeline, detects the internal defects and the damage positions of the thick-wall pipeline, can timely detect the hidden defects of the thick-wall pipeline, is convenient for maintenance and guarantee, and can effectively reduce the operation and maintenance cost of a system.
Description
Technical Field
The invention relates to the field of nondestructive detection of pipelines, in particular to a method for diagnosing damage states of inner bores of pipelines.
Background
The thick-wall pipeline is often used in military equipment and other process industries, and when in use, the inner wall of the pipeline is subjected to thermal shock stress and mechanical friction action formed by high-temperature (2500-3200 ℃) and high-pressure (140-700 MPa) gas, so that the thick-wall pipeline is easily damaged by cracks, abrasion, breakage, ablation, coating falling and the like. After long-term use, the inner wall of the steel pipe can generate more micro-damage, the residual service life is difficult to predict, and the steel pipe becomes a great hidden danger influencing the safe operation of components.
The existing thick-wall pipeline detection means can not detect the internal defects of the pipe wall of the thick-wall pipeline and can not quantitatively detect the damage size of the thick-wall pipeline, and the development trend of equipment guarantee technology can not be met.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for diagnosing the damage state of the inner bore of the pipeline, which can detect the damage position and the damage size in the pipeline.
In order to realize the purpose, the invention adopts the following technical scheme:
a method for diagnosing damage state of a pipeline inner bore is used for acquiring damage position and damage size of the detected pipeline inner bore, and comprises the following steps:
s1, an ultrasonic electromagnetic ultrasonic excitation end and an ultrasonic electromagnetic ultrasonic receiving end are arranged on the outer wall of a detected pipeline along the same radial plane, a signal sent to the inner bore or the inner wall of the detected pipeline by the ultrasonic electromagnetic ultrasonic excitation end is a transmitting signal, a signal reflected by the detected pipeline is a reflected signal, and the ultrasonic electromagnetic ultrasonic receiving end acquires the reflected signal;
establishing a waveform database, wherein the waveform database comprises a non-damage waveform and a damage waveform of a pipeline;
s2, comparing the waveform corresponding to the reflection signal with the waveform in the waveform database, if the waveform corresponding to the reflection signal is identical to the damage waveform, determining that the detected pipeline is an internal bore damage pipeline, and if the reflection signal is a damage reflection signal, performing the step S3, otherwise, determining that the detected pipeline is a non-damage pipeline;
s3, passing time delta t and signal propagation speed c g Calculating the damage position of the bore damage pipeline in the step S2, wherein delta t is the time for transmitting the damage reflection signal to the ultrasonic electromagnetic ultrasonic receiving end, and c g Is a constant;
and acquiring the damage size of the damaged pipeline in the bore through the amplitude of the damage reflection signal.
Further, the reflected signals in steps S2 and S3 are after the reflected signal preprocessing in step S1, and the specific steps of preprocessing the reflected signal in step S1 are as follows:
the narrow-band high-Q-value band-pass filter filters a reflection signal acquired by the ultrasonic electromagnetic ultrasonic receiving end, and the weak signal conditioner amplifies the filtered reflection signal to acquire a preprocessed reflection signal.
Further, the specific steps of calculating the damage position of the bore damage conduit in step S3 are as follows:
wherein t is the time from the transmission of the ultrasonic electromagnetic ultrasonic excitation end to the reception of the reflected signal by the ultrasonic electromagnetic ultrasonic receiving end, and t is the time taken for the ultrasonic electromagnetic ultrasonic excitation end to receive the reflected signal Excitation And k is the period of the transmitting signal of the ultrasonic electromagnetic ultrasonic excitation end, is equal to the number of times that the transmitting signal is reflected plus one, and l is the linear distance between the ultrasonic electromagnetic ultrasonic excitation end and the pipeline damage part, namely the damage position.
Further, the damage waveform in the step S2 includes a negative line crack waveform, a positive line wear waveform, a positive line root crack waveform, and a hidden defect waveform; the amplitude of the damage-reflected signal includes the signal amplitude y of the negative line crack waveform Yin (kidney) Signal amplitude y of positive line wear waveform Wear and tear Signal amplitude y of the sun root crack waveform Yang (Yang) Signal amplitude y of the implicit defect waveform Concealed (ii) a The damage size in the step S3 comprises the size x of the female wire crack of the detected pipeline along the axial direction of the pipeline corresponding to the female wire crack waveform Yin body The abrasion size x of the positive line of the detected pipeline along the radial direction of the pipeline corresponding to the positive line abrasion waveform Wear and tear The crack size x of the external root of the detected pipeline along the circumferential direction of the pipeline corresponding to the external root crack waveform Yang (Yang) The size x of the hole corresponding to the hidden defect of the detected pipeline corresponding to the hidden defect waveform along the radial direction of the pipeline Concealed ；
y Wear and tear ＝A 2 x Wear and tear +B 2
y Concealed ＝A 4 x Concealed +B 4
Wherein A is 1 、B 1 、C 1 、A 2 、B 2 、A 3 、B 3 、C 3 、D 3 、E 3 、A 4 、B 4 Are all constants.
Further preferably, the calculation formula of k is as follows:
l probe head ＝R 2 ×N×θ
k＝N+2
The center of a radial section of the pipeline at the positions of the excitation end and the receiving end is O; r is 1 The distance between the damage position and the center O is recorded as the length of a straight line OA; r 2 Is the distance between the excitation end and the center O of a circleOff, length marked as straight line OB; a is an included angle between a path of the first reflection signal and OB; beta is the included angle between the path of the first reflected signal and OA; theta is an included angle between OB and OA; l Probe head The distance between the excitation end probe and the receiving end probe along the arc surface; n is an even number.
Further preferably, the following components: the inner diameter of the pipe is 155mm, the thickness is 23.5mm, the arc length of the exciting end and the receiving end along the outer wall of the pipe is 81.56mm, and the value of k is 6.
Further, the ultrasonic guided wave sent to the inner bore of the detected pipeline by the ultrasonic electromagnetic ultrasonic excitation end is an oblique incidence SH wave.
Further, the distance between the ultrasonic electromagnetic ultrasonic excitation end and the ultrasonic electromagnetic ultrasonic receiving end is kept unchanged, and the ultrasonic electromagnetic excitation end and the ultrasonic electromagnetic ultrasonic receiving end are rotatably arranged on the outer wall of the pipeline.
Further preferably, A 1 is-0.09082,B 1 Is 1.41307 of 1 Is 0.09685,A 2 Is 2.09091,B 2 Is 3.59364A 3 is-0.07284,B 3 is-0.04597,C 3 Was found to be 0.41958, D 3 Is-0.52316, E 3 Is 3.74889,A 4 Was 2.15939,B 4 Is 0.30267.
The invention has the following beneficial effects:
(1) According to the invention, the damage position is calculated by analyzing the reflected signal; and extracting the amplitude of the reflected signal, and calculating the damage size according to the amplitude.
The diagnosis method is suitable for detecting and identifying the defects of the complex structures of the inner walls of various thick-wall pipelines, detects the internal defects and the damage positions of the thick-wall pipelines, can detect hidden defects of the thick-wall pipelines in time so as to facilitate maintenance and guarantee, and can effectively reduce the operation and maintenance cost of the system.
(2) The common nondestructive detection of the pipeline is difficult to accurately detect and quantify the defects of the inner wall of the pipeline, the efficiency is low, the pipeline is scrapped in advance, and a large amount of resources are wasted. The invention provides a detection and quantification method based on ultrasonic waves for damage of a complex structure of the inner wall of a thick-wall pipeline, which can effectively detect female line cracks, male line abrasion, male line root cracks and hidden defects of the inner wall of the thick-wall pipeline, is convenient for further estimating the service life of the pipeline, and provides a basis for monitoring the structural health of key parts of the thick-wall pipeline and technical support for equipment maintenance guarantee.
(3) The oblique wave has less energy loss when meeting the discontinuity of the interface or the boundary, the signal analysis is easier, and the method is more suitable for defect detection. The oblique wave has stronger penetrability and is often used for welding line detection, pipeline detection, defect plate detection, sample thickness measurement and the like.
(4) Due to the inherent characteristics of ultrasonic waves, the ultrasonic-based method for quantitatively detecting the damage state of the thick-wall pipeline can be used for detecting the defects of the inner wall of the thick-wall pipeline. The invention respectively calculates the size of the negative line crack, the size of the positive line abrasion, the size of the positive line root crack and the size of the hidden defect, and simplifies the complex problem of multivariable change into the problem of multiple single variable changes by adopting a control variable method.
(5) The distance between the ultrasonic electromagnetic ultrasonic excitation end and the ultrasonic electromagnetic ultrasonic receiving end is kept unchanged, the reflection times of signals are kept unchanged, and calculation is facilitated. The excitation end and the receiving end are installed on the lantern ring, the lantern ring is sleeved on the outside of the pipeline, when the lantern ring carries the excitation end and the receiving end to rotate for a circle, whether the pipeline of the section is damaged or not can be detected, missing detection is avoided, and the accuracy of detection is improved.
Drawings
FIG. 1 is a schematic view of the pipeline damage detection of the present invention;
FIG. 2 is a schematic view of the piping structure of the present invention;
FIG. 3 is a schematic view of lesion localization of the present invention;
FIG. 4 is a flow chart of the present invention;
FIG. 5 is a waveform diagram corresponding to an echo signal of a negative line crack defect of the present invention;
FIG. 6 is a plot of negative line crack size as a function of echo amplitude for the present invention;
FIG. 7 is a plot of the magnitude of the positive line wear as a function of the echo amplitude for the present invention;
FIG. 8 is a plot of the size of the positive root crack as a function of the echo amplitude for the present invention;
FIG. 9 is a graph of the size of an implicit defect as a function of echo amplitude according to the present invention;
FIG. 10 is a schematic view of the excitation and receiving ends of the present invention moving along a pipe.
Detailed Description
The technical scheme of the invention is clearly and completely described below by combining the embodiment and the attached drawings of the specification. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
A method for diagnosing damage state of a pipeline inner bore is used for acquiring damage position and damage size of the detected pipeline inner bore, and comprises the following steps:
s1, as shown in figures 1 and 3, an ultrasonic electromagnetic ultrasonic excitation end and an ultrasonic electromagnetic ultrasonic receiving end are arranged on the outer wall of a detected pipeline along the same radial plane, the distance between the ultrasonic electromagnetic ultrasonic excitation end and the ultrasonic electromagnetic ultrasonic receiving end is kept unchanged, the ultrasonic electromagnetic ultrasonic excitation end and the ultrasonic electromagnetic ultrasonic receiving end are both rotatably arranged on the outer wall of the pipeline, and as shown in figure 10, the ultrasonic electromagnetic ultrasonic receiving end and the ultrasonic electromagnetic receiving end move along the circumferential direction of the thick-wall pipeline. The ultrasonic electromagnetic ultrasonic excitation end sends a transmission signal to the bore of the detected pipeline, in this embodiment, the transmission signal is an ultrasonic guided wave signal, in this embodiment, the ultrasonic guided wave is an oblique incident SH wave, and a reflected signal is reflected by the bore of the detected pipeline.
And establishing a waveform database, wherein the waveform database comprises the non-damage waveform and the damage waveform of the pipeline.
In the implementation, a sine output signal which is as high as 20MHz, stable, accurate, pure and low-distortion is generated by an Agilent 33220A random waveform generator, the signal is amplified by an RIEC GA-2500A high-power gated RF pulse amplifier, high-frequency current is input into an excitation end of an electromagnetic ultrasonic probe through pre-impedance matching, a receiving end of the electromagnetic ultrasonic probe receives weak vibration and converts the weak vibration into a current signal, an echo signal is input into a high (low) pass filter and an Olympus5072PR through a post-impedance matching system to carry out filtering and signal amplification of noise, analog-to-digital conversion is completed by a data acquisition card, and data is sent into a LabVIEW software interface arranged on a computer, so that data acquisition, waveform display and data storage are completed, sample data are obtained, a waveform database is established according to the sample data, and the waveform database comprises non-damage waveforms and damage waveforms of a thick-wall pipeline.
In this embodiment, signal preprocessing may not be performed, and the acquired reflected signal is weak, which may reduce accuracy of the damage diagnosis.
S2, comparing the waveform corresponding to the reflection signal with the waveform in the waveform database, if the waveform corresponding to the reflection signal is identical to the damage waveform, determining that the detected pipeline is an internal bore damage pipeline, and if the reflection signal is a damage reflection signal, performing the step S3, otherwise, determining that the detected pipeline is a non-damage pipeline;
s3, passing time delta t and signal propagation speed c g Calculating the damage position of the bore damage pipeline in the step S2, wherein delta t is the time for transmitting the damage reflection signal to the ultrasonic electromagnetic ultrasonic receiving end, c g Is a constant. The specific process is as follows:
wherein t is the time from the transmission of the ultrasonic electromagnetic ultrasonic excitation end to the reception of the reflected signal by the ultrasonic electromagnetic ultrasonic receiving end, and t is the time taken for the ultrasonic electromagnetic ultrasonic excitation end to receive the reflected signal Excitation K is the period of the transmission signal of the ultrasonic electromagnetic ultrasonic excitation end, is equal to the number of times of the reflected transmission signal plus one, namely the number of paths for transmitting the signal of the excitation end when the signal is received by the receiving end, the transmission signal reaches the damage position and is a first path, the damage position reflects the signal out to be a second path until the receiving end receives the signalTotal number of bars. l is the linear distance between the ultrasonic electromagnetic ultrasonic excitation end and the pipeline damage position, namely the damage position, and in the embodiment, as shown in fig. 3, the value of k is 6.l is the linear distance between the ultrasonic electromagnetic ultrasonic excitation end and the pipeline damage position, namely the damage position.
The specific calculation process of k is as follows:
l probe head ＝R 2 ×N×θ
k＝N+2
The center of a radial section of the pipeline at the positions of the excitation end and the receiving end is O; r is 1 The distance between the damage position and the center O is recorded as the length of a straight line OA; r is 2 The distance between the excitation end and the center O is recorded as the length of a straight line OB; a is an included angle between a path of the first reflected signal and OB, and in the embodiment, a is 30 degrees; beta is the included angle between the path of the first reflected signal and OA; theta is an included angle between OB and OA; l Probe head The distance between the excitation end probe and the receiving end probe along the arc surface; n is an even number.
In the embodiment, the inner diameter of the thick-wall pipeline is 155mm, the wall thickness is 23.5mm, the length is 10mm, and the arc length of the excitation end and the receiving end along the outer wall of the pipeline is 81.56mm. c. C g =3260m/s, t is 59.87 μ s, t Excitation Taking 5 mu s, calculating to obtain that the damage position of the detected thick-wall pipeline is 31.17mm away from the excitation end, and the distance is a straight line distance. And the actual damage position of the detected thick-wall pipeline is 30.61mm away from the excitation end, and the relative error is 0.56mm, as shown in figure 3. Table 1 shows the actual damage location of the female wire crack and the damage location calculated by the method of the present invention.
Obtaining the damage size of the damaged pipeline in the inner bore through the amplitude of the damage reflection signal as shown in FIG. 5, wherein the damage size comprises the dimension x of the female line crack of the detected pipeline along the axial direction of the pipeline corresponding to the female line crack waveform Yin (kidney) The male line of the pipeline to be detected corresponding to the male line abrasion waveform is along the radial abrasion ruler of the pipelineCun x Wear and tear The crack size x of the external root of the detected pipeline along the circumferential direction of the pipeline corresponding to the external root crack waveform Yang (Yang) The size x of the hole corresponding to the hidden defect of the detected pipeline corresponding to the hidden defect waveform along the radial direction of the pipeline Concealed . As shown in fig. 2, the female line is a concave portion of the inner bore of the pipeline, and the male line is a newly convex portion of the inner bore of the pipeline. As shown in fig. 1, an implicit defect is a defect that occurs inside a pipe.
Dimension x of the lower pair female line crack along the axial direction of the pipe Yin (kidney) Radial dimension x of the male line along the pipe Wear and tear The size x of the crack at the root of the male wire along the circumferential direction of the pipeline Yang (Yang) Dimension x of hole corresponding to hidden defect along radial direction of pipeline Concealed Are introduced separately.
Dimension of female line crack along axial direction of pipeline
Changing the axial length dimension of the female wire crack, keeping the circumferential width and the radial depth of the female wire crack unchanged, and establishing a graph of the size of the female wire crack and the defect echo through the sample data in the step S1, as shown in FIG. 6. Inputting the amplitude of a defect echo signal corresponding to the detected thick-wall pipeline into a curve graph of the axial length and the echo amplitude, and obtaining the axial length dimension of the female line crack of the detected thick-wall pipeline, wherein the abscissa of the curve graph is the axial length dimension of the female line crack, and the ordinate is the echo amplitude.
y Yin (kidney) ＝A 1 x Yin (kidney) 2 +B 1 x Yin body +C 1
Wherein y is Yin body Amplitude of reflected signal for impairment, A 1 、B 1 、C 1 Are all constants, in this example, A 1 is-0.09082,B 1 Was 1.41307,C 1 It was 0.09685.
Radial wear dimension of male line along pipeline
y Wear and tear ＝A 2 x Wear and tear +B 2
Table 2 shows the correspondence between the size of the positive line wear and the amplitude of the echo signal. As shown in FIG. 7, the positive line wear is linearly related to the amplitude of the echo signal, A 2 、B 2 Are all constants, in this example, A 2 Is 2.09091,B 2 Is 3.59364.
Size of crack at root of male wire along circumferential direction of pipeline
y Yang (Yang) ＝A 3 x Yang (Yang) 4 +B 3 x Yang (Yang) 3 +C 3 x Yang (Yang) 2 +D 3 x Yang (Yang) +E 3
As shown in fig. 8, the amplitude of the echo signal gradually decreases as the size of the male root crack increases. In this example, A 3 、B 3 、C 3 、D 3 Are all constants, in this example, A 3 is-0.07284,B 3 is-0.04597,C 3 Was found to be 0.41958, D 3 Is-0.52316, E 3 Was 3.74889.
Size of hole corresponding to hidden defect along radial direction of pipeline
y Concealed ＝A 4 x Concealed +B 4
As shown in FIG. 9, the implicit defect diameter is linearly related to the amplitude of the echo signal, in this embodiment, A 4 Was 2.15939,B 4 Is 0.30267.
TABLE 1
TABLE 2
| Dimension of solar ray abrasion/mm | Amplitude/10 of echo signal -13 mm |
| 0 | 3.6 |
| 0.005 | 3.61 |
| 0.01 | 3.62 |
| 0.02 | 3.64 |
| 0.04 | 3.67 |
| 0.06 | 3.71 |
| 0.08 | 3.75 |
| 0.1 | 3.8 |
| 0.12 | 3.84 |
| 0.14 | 3.88 |
| 0.16 | 3.94 |
| 0.18 | 3.98 |
| 0.2 | 4.01 |
Claims (7)
1. A method for diagnosing damage state of a pipeline inner bore is characterized in that the method for diagnosing is used for acquiring the damage position and the damage size of the detected pipeline inner bore and comprises the following steps:
s1, an ultrasonic electromagnetic ultrasonic excitation end and an ultrasonic electromagnetic ultrasonic receiving end are arranged on the outer wall of a detected pipeline along the same radial plane, a signal sent to the inner bore or the inner wall of the detected pipeline by the ultrasonic electromagnetic ultrasonic excitation end is a transmitting signal, a signal reflected by the detected pipeline is a reflected signal, and the ultrasonic electromagnetic ultrasonic receiving end acquires the reflected signal;
establishing a waveform database, wherein the waveform database comprises a non-damage waveform and a damage waveform of the pipeline;
s2, comparing the waveform corresponding to the reflection signal with the waveform in the waveform database, if the waveform corresponding to the reflection signal is identical to the damage waveform, determining that the detected pipeline is an internal bore damage pipeline, and if the reflection signal is a damage reflection signal, performing the step S3, otherwise, determining that the detected pipeline is a non-damage pipeline;
s3, passing time delta t and signal propagation speed c g Calculating the damage position of the bore damage pipeline in the step S2, wherein delta t is the time for transmitting the damage reflection signal to the ultrasonic electromagnetic ultrasonic receiving end, and c g Is a constant; acquiring the damage size of the damaged pipeline in the bore through the amplitude of the damage reflection signal;
the specific steps of calculating the damage position of the damaged conduit of the bore in step S3 are as follows:
wherein t is the time from the transmission of the ultrasonic electromagnetic ultrasonic excitation end to the reception of the reflected signal by the ultrasonic electromagnetic ultrasonic receiving end, and t is the time taken for the ultrasonic electromagnetic ultrasonic excitation end to receive the reflected signal Excitation For the period of the transmitted signal of the ultrasonic electromagnetic ultrasonic excitation endK is equal to the number of times that the transmitted signal is reflected plus one, and l is the linear distance between the ultrasonic electromagnetic ultrasonic excitation end and the pipeline damage part, namely the damage position;
the damage waveforms in the step S2 comprise a negative line crack waveform, a positive line abrasion waveform, a positive line root crack waveform and an implicit defect waveform; the amplitude of the damage-reflected signal includes the signal amplitude y of the negative line crack waveform Yin (kidney) Signal amplitude y of sun-line wear waveform Wear and tear Signal amplitude y of the sun root crack waveform Yang (Yang) Signal amplitude y of the implicit defect waveform Concealed (ii) a The damage size in the step S3 comprises the size x of the female wire crack of the detected pipeline along the axial direction of the pipeline corresponding to the female wire crack waveform Yin (kidney) The abrasion size x of the positive line of the detected pipeline along the radial direction of the pipeline corresponding to the positive line abrasion waveform Wear and tear The crack size x of the external line root of the detected pipeline along the circumferential direction of the pipeline corresponding to the external line root crack waveform Yang (Yang) The size x of the hole corresponding to the hidden defect of the detected pipeline corresponding to the hidden defect waveform along the radial direction of the pipeline Concealed ；
y Wear and tear ＝A 2 x Wear and tear +B 2
y Concealed ＝A 4 x Concealed +B 4
Wherein, A 1 、B 1 、C 1 、A 2 、B 2 、A 3 、B 3 、C 3 、D 3 、E 3 、A 4 、B 4 Are all constants.
2. The method for diagnosing a damaged state of a pipe bore according to claim 1, wherein the reflected signals in steps S2 and S3 are after the reflected signal preprocessing in step S1, and the specific steps of preprocessing the reflected signal in S1 are as follows:
the narrow-band high-Q-value band-pass filter filters the reflection signals acquired by the ultrasonic electromagnetic ultrasonic receiving end, and the weak signal conditioner amplifies the filtered reflection signals to acquire preprocessed reflection signals.
3. The method for diagnosing a damage status of a tube bore according to claim 2, wherein k is calculated as follows:
l probe head ＝R 2 ×N×θ
k＝N+2
The center of a radial section of the pipeline at the positions of the excitation end and the receiving end is O; r 1 The distance between the damage position A and the center O is recorded as the length of a straight line OA; r 2 Recording the distance between the excitation end B and the circle center O as the length of a straight line OB; a is an included angle between a path of the first reflection signal and OB; beta is the included angle between the path of the first reflected signal and OA; theta is an included angle between OB and OA; l Probe head The distance between the excitation end probe and the receiving end probe along the arc surface; n is an even number.
4. The method for diagnosing a damage state of a pipe bore according to claim 1, wherein: the inner diameter of the pipe is 155mm, the thickness is 23.5mm, the arc length of the exciting end and the receiving end along the outer wall of the pipe is 81.56mm, and the value of k is 6.
5. The method for diagnosing a damage state of a pipe bore according to claim 1, wherein: the ultrasonic wave electromagnetic ultrasonic excitation end sends ultrasonic guided waves to the bore of the detected pipeline, and the ultrasonic guided waves are oblique incidence SH waves.
6. The method for diagnosing a damage status of a tube bore according to claim 1, wherein: the distance between the ultrasonic electromagnetic ultrasonic excitation end and the ultrasonic electromagnetic ultrasonic receiving end is kept unchanged and is rotatably arranged on the outer wall of the pipeline.
7. The method for diagnosing a damage state of a pipe bore according to claim 1, wherein: a. The 1 is-0.09082,B 1 Was 1.41307,C 1 Is 0.09685,A 2 Is 2.09091,B 2 Is 3.59364A 3 is-0.07284,B 3 is-0.04597,C 3 Was found to be 0.41958, D 3 Is-0.52316, E 3 Is 3.74889,A 4 Was 2.15939,B 4 Is 0.30267.
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| CN112083066A (en) * | 2020-06-16 | 2020-12-15 | 西安工程大学 | Non-contact ultrasonic detection method |
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| CN113514548A (en) * | 2021-07-09 | 2021-10-19 | 厦门大学 | Weld defect detection method based on characteristic guided waves |
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