CN117330637A - Ultrasonic detection method for wall thickness corrosion of civil indoor gas riser - Google Patents

Ultrasonic detection method for wall thickness corrosion of civil indoor gas riser Download PDF

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Publication number
CN117330637A
CN117330637A CN202311310192.1A CN202311310192A CN117330637A CN 117330637 A CN117330637 A CN 117330637A CN 202311310192 A CN202311310192 A CN 202311310192A CN 117330637 A CN117330637 A CN 117330637A
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China
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ultrasonic
echo
wall thickness
detection
mode
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CN202311310192.1A
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韩有华
许远明
李定波
孙景照
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Henan Delang Intelligent Technology Co ltd
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Henan Delang Intelligent Technology Co ltd
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Priority to CN202311310192.1A priority Critical patent/CN117330637A/en
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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
    • G01N29/041—Analysing solids on the surface of the material, e.g. using Lamb, Rayleigh or shear waves
    • 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
    • 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
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/24—Probes
    • 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
    • G01N29/449—Statistical methods not provided for in G01N29/4409, e.g. averaging, smoothing and interpolation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/023—Solids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/028—Material parameters
    • G01N2291/0289—Internal structure, e.g. defects, grain size, texture
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/044—Internal reflections (echoes), e.g. on walls or defects

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  • Physics & Mathematics (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Pathology (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Acoustics & Sound (AREA)
  • Probability & Statistics with Applications (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

The invention discloses an ultrasonic detection method for wall thickness corrosion of a civil indoor gas riser, which relates to the technical field of gas pipeline detection and comprises the following steps: s10, modulating the frequency of an ultrasonic signal to a preset frequency range; s20, receiving the echo and analyzing the time difference and the amplitude difference of the echo and the reflection information; s30, determining and displaying the defect position and the defect size. The ultrasonic detection method of the invention can accurately determine the quality and quantity of the defects in the gas vertical pipe; meanwhile, the result display is visual during detection, the detection result can be directly recorded, and the detection distance and the detection precision are greatly improved.

Description

Ultrasonic detection method for wall thickness corrosion of civil indoor gas riser
Technical Field
The invention relates to the technical field of gas pipeline detection, in particular to an ultrasonic detection method for wall thickness corrosion of a civil indoor gas riser.
Background
The ultrasonic detection technology is a technology of researching reflected, transmitted and scattered waves through interaction of ultrasonic waves and a test piece, detecting and characterizing macroscopic defect detection, geometric characteristic measurement, detection and characterization of tissue structure and mechanical property change of the test piece, and further evaluating specific application of the test piece. The ultrasonic detection technology has wide application range, and can be used for metal, nonmetal and composite materials from the aspect of materials of detection objects. The detection technology department detects different objects, types and emphasis points, for example, the detection technology department can be used for forgings, castings, welding pieces, cementing pieces and the like from the aspect of the manufacturing process of detection objects; the method can be used for plates, bars, pipes and the like in terms of the shape of the detection object; the thickness can be as small as 1mm or as large as several meters in terms of the size of the detection object; the defect site may be a surface defect or an internal defect.
The ultrasonic detection has the advantages of strong penetrating power, accurate defect positioning, high sensitivity, low detection cost and the like. However, the defects exist, and the defects in the test piece are mainly characterized in that the first step, the accurate qualitative and quantitative steps are still needed to be studied intensively; secondly, ultrasonic detection of a test piece with a complex shape or an irregular shape is difficult; thirdly, the position, orientation and shape of the defect have certain influence on the detection result; fourth, the material, grain size, etc. have a larger influence on detection; fifthly, the result display is not visual during detection, and the detection result has no direct witness record.
Disclosure of Invention
The invention aims to solve the technical problem of providing an ultrasonic detection method capable of accurately detecting the defect position and intuitive detection result for wall thickness corrosion of a civil indoor gas riser.
The technical scheme adopted for solving the technical problems is as follows: the ultrasonic detection method for the wall thickness corrosion of the civil indoor gas riser comprises the following steps:
s10, modulating the frequency of an ultrasonic signal to a preset frequency range;
s20, receiving the echo and analyzing the time difference and the amplitude difference of the echo and the reflection information;
s30, determining and displaying the defect position and the defect size.
Further, step S20 of receiving the echo and analyzing the time difference and amplitude difference between the echo and the reflection information includes
S201, acquiring lamb wave echo signals and the number of wave peaks, and if two wave peaks exist, executing a step S202;
s202, extracting propagation speeds of S0 mode and A0 mode lamb waves of the lamb wave echo signals in a preset frequency range in pipes with different wall thicknesses.
Further, the preset frequency range of the ultrasonic signal is 1-10M.
Further, step S30 of determining the defect location and defect size includes
S301, calculating the lamb wave speed difference between the S0 mode and the A0 mode in a statistical mode;
s302, determining the corrosion degree based on the speed difference.
Further, the ultrasonic probe for detection comprises a probe body, a channel arranged on the probe body and an arc-shaped groove arranged along the side wall of the probe.
The ultrasonic detection method for the wall thickness corrosion of the civil indoor gas riser has the following beneficial effects:
1. the defects in the gas vertical pipe are accurately qualitative and quantitative;
2. the problem that the original gas pipeline detection is only visually and macroscopically observed by human eyes and has the scientificity of strong subjectivity, excessive large-range replacement and premature replacement is solved, and the detection blank in the aspect is made up;
3. the result display is visual during detection, and the detection result can be directly recorded;
4. the customized probe concentrates excitation energy in a special ultrasonic mode, so that the detection distance and the detection precision can be greatly improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a block diagram of an ultrasonic detection method according to an embodiment of the present invention;
FIG. 2 is a graph of lamb wave echo signals for an ultrasonic detection method according to an embodiment of the present invention;
FIG. 3 is a graph of lamb wave echo signals for an ultrasonic detection method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the structure of an ultrasound device according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an ultrasonic detection method according to an embodiment of the present invention;
FIG. 6 is a schematic view of the structure of an ultrasonic probe according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view taken along line A-A of FIG. 6;
fig. 8 is a schematic structural view of an ultrasonic probe according to an embodiment of the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in FIG. 1, the ultrasonic detection method for wall thickness corrosion of the civil indoor gas riser comprises the following steps:
s10, modulating the frequency of an ultrasonic signal to a preset frequency range;
s20, receiving the echo and analyzing the time difference and the amplitude difference of the echo and the reflection information;
s30, determining and displaying the defect position and the defect size.
The ultrasonic detection method for the wall thickness corrosion of the civil indoor gas riser has the following beneficial effects:
1. the defects in the gas vertical pipe are accurately qualitative and quantitative;
2. the problem that the original gas pipeline detection is only visually and macroscopically observed by human eyes and has the scientificity of strong subjectivity, excessive large-range replacement and premature replacement is solved, and the detection blank in the aspect is made up;
3. the result display is visual during detection, and the detection result can be directly recorded;
4. the customized probe concentrates excitation energy in a special ultrasonic mode, so that the detection distance and the detection precision can be greatly improved.
Step S20 of receiving the echo and analyzing the time difference and amplitude difference of the echo and the reflection information, including
S201, acquiring lamb wave echo signals and the number of wave peaks, and if two wave peaks exist, executing a step S202;
s202, extracting propagation speeds of S0 mode and A0 mode lamb waves of the lamb wave echo signals in a preset frequency range in pipes with different wall thicknesses.
Lamb wave is a stress wave formed by superposition of longitudinal wave and transverse wave in a component with two parallel surfaces, particle vibration is affected by an upper interface and a lower interface during propagation, and a vibration mode is quite complex. Lamb waves can be divided into two types according to the vibration characteristics of sound wave particles, namely symmetrical lamb waves (S) which are symmetrically moved by the particles, and anti-symmetrical lamb waves (A) which are anti-symmetrically moved by the particles. Each type of lamb wave is in turn divided into different modes, such as the common low-order modes (A0, A1, S0, S1), and the high-order modes (A2, S2, A3, S3), depending on the speed. The vibration mode of the modal lamb wave changes with the change of parameters such as frequency, plate thickness and the like.
In order to obtain the lamb wave with a specific mode in actual detection, the sound beam incident angle of the probe needs to be calculated in the excitation process, and the calculation of the incident angle is shown as a formula (1).
α=arcsin（c 1 /c p ） (1)
Wherein: c 1 Is the propagation velocity of the longitudinal wave in the wedge; c p Phase velocity of lamb waves in a test piece. As is clear from the equation (1), when the propagation velocity of the longitudinal wave in the wedge is constant, the beam incident angle can be calculated by determining the phase velocity of the lamb wave in the test piece.
In this embodiment, the lamb wave echo signals are collected to obtain the lamb wave end face echoes under different thicknesses, and if the end face echo has only one peak, the propagation speeds of the lamb waves of the S0 and A0 modes are consistent under the thickness, so that the end face echoes are continuously overlapped in the time domain.
If there are two peaks in the end echo, the propagation speeds of the S0 mode lamb wave and the A0 mode lamb wave are different under the thickness, and at this time, the propagation speed of the S0 mode lamb wave is greater than that of the A0 mode lamb wave, so that the end echo has a time interval form in the time domain. To further quantitatively analyze the intervals in the time domain, the propagation speeds of lamb waves of the S0 mode and the A0 mode with the frequency of 10MHz in the signals in pipes with different wall thicknesses are extracted, and statistical calculation is performed, which is shown in fig. 2.
Step S30 of determining defect position and defect size including
S301, calculating the lamb wave speed difference between the S0 mode and the A0 mode in a statistical mode;
s302, determining the corrosion degree based on the speed difference.
Statistical experiments show that when corrosion does not occur, the group velocity of the lamb wave of the S0 mode and the A0 mode is basically consistent; when the thickness of the pipe wall changes, the A0 mode lamb group velocity is basically stable at 3100 m.s －１ Left and right, and the group velocity of S0 mode lamb wave is 3051 m.s －１ Greatly increase to 4678 m.s －１ The speed change is proportional to the thinning amount (when the wall thickness is thinned by 30%), the difference between the S0 mode and the A0 mode lamb wave speed is larger as the thinning amount is larger, the time interval between the two echoes is larger, and the corrosion degree of the gas pipeline can be judged through the time interval.
The data display adopts visual intelligent judgment, and 359mm is the distance between the probe and the defect as shown in figure 3.
The detection device shown in fig. 4 is mainly divided into two parts, namely a host and an ultrasonic probe, wherein a data processing unit and a signal receiving and sending unit are integrated in the host, the host modulates 1-10M ultrasonic signals through the control signal receiving and sending unit, receives echoes through reflection in the process of propagation in an object to be detected, analyzes the time difference and the amplitude difference of the received echoes and the transmitted signals, further analyzes the size and the position of defects, and displays the results on a display screen in an intuitive mode as shown in fig. 5.
Referring to fig. 6-8, an ultrasonic probe includes a probe body, a channel disposed on the probe body, and an arcuate groove formed along a side wall of the probe. The data processing unit, the signal receiving and transmitting unit and the power supply are integrated, so that the operation of a user is facilitated.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims (5)

1. An ultrasonic detection method for wall thickness corrosion of a civil indoor gas riser is characterized by comprising the following steps:
s10, modulating the frequency of an ultrasonic signal to a preset frequency range;
s20, receiving the echo and analyzing the time difference and the amplitude difference of the echo and the reflection information;
s30, determining and displaying the defect position and the defect size.
2. The ultrasonic detection method for wall thickness corrosion of domestic gas riser according to claim 1, wherein step S20 of receiving the echo and analyzing the time difference and amplitude difference of the echo and the reflection information comprises
S201, acquiring lamb wave echo signals and the number of wave peaks, and if two wave peaks exist, executing a step S202;
s202, extracting propagation speeds of S0 mode and A0 mode lamb waves of the lamb wave echo signals in a preset frequency range in pipes with different wall thicknesses.
3. The ultrasonic detection method for wall thickness corrosion of a household gas riser of claim 2, wherein the preset frequency range of the ultrasonic signal is 1-10M.
4. The ultrasonic detection method for wall thickness corrosion of domestic gas riser according to claim 2, wherein step S30 comprises determining defect position and defect size, comprising
S301, calculating the lamb wave speed difference between the S0 mode and the A0 mode in a statistical mode;
s302, determining the corrosion degree based on the speed difference.
5. The ultrasonic method for detecting wall thickness corrosion of a domestic gas riser according to any one of claims 1 to 4, further comprising an ultrasonic probe for detection, wherein the ultrasonic probe comprises a probe body, a channel arranged on the probe body, and an arc-shaped groove arranged along the side wall of the probe.
CN202311310192.1A 2023-10-11 2023-10-11 Ultrasonic detection method for wall thickness corrosion of civil indoor gas riser Pending CN117330637A (en)

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Application Number Priority Date Filing Date Title
CN202311310192.1A CN117330637A (en) 2023-10-11 2023-10-11 Ultrasonic detection method for wall thickness corrosion of civil indoor gas riser

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