Pipeline guided wave damage identification and positioning method, device and system based on information entropy

A technology of damage identification and localization method, which is applied in the processing of detection response signals and the use of sonic/ultrasonic/infrasonic waves to analyze solids. range, effects of improved robustness and sensitivity

Active Publication Date: 2021-03-16
JINAN UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the guided wave detection technology is applied to pipeline damage detection, due to the complexity of the actual service environment of the pipeline, the unknown size and location of the damage, and the attenuation of the guided wave itself, it is very difficult to extract weak characteristic signal bands in the background of strong noise. here comes a serious challenge
[0005] Commonly used weak signal detection methods include time-frequency analysis, statistical analysis, correlation analysis, etc., but the above methods are all linear methods, mostly using noise suppression technology, which may damage useful signals when detecting weak signals in the background of noise , making the original weak signal more difficult to identify, thus affecting the detection accuracy

Method used

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  • Pipeline guided wave damage identification and positioning method, device and system based on information entropy
  • Pipeline guided wave damage identification and positioning method, device and system based on information entropy
  • Pipeline guided wave damage identification and positioning method, device and system based on information entropy

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Embodiment 1

[0078] Such as figure 1 As shown, this embodiment provides a pipeline guided wave damage identification and location system, the system includes an arbitrary waveform generator 101, a power amplifier 102, a guided wave excitation transducer 103, a guided wave receiving transducer 104, a digital oscilloscope 105 and computer 106.

[0079] Further, the guided wave excitation transducer 103 and the guided wave receiving transducer 104 of this embodiment are arranged on the end face of the pipeline 107, and the arbitrary waveform generator 101, the power amplifier 102 and the guided wave excitation transducer 103 are connected in sequence, The guided wave receiving transducer 104, the digital oscilloscope 105 and the computer 106 are sequentially connected. The arbitrary waveform generator 101 generates a pulse signal modulated by the Hanning window, which is amplified by the power amplifier 102, and then the guided wave excites the transducer 103. A specific frequency guided wav...

Embodiment 2

[0090] Such as image 3 As shown, this embodiment takes a specific experiment as an example to identify and locate the damage of the pipeline in the laboratory. The specific implementation process is as follows:

[0091] 1) The pipe adopts a steel hollow pipe with a length of 3m. Artificial straight cracks with 10% section loss rate and 25% section loss rate are respectively made in the middle of the end face of the pipe, that is, at 1.5m. Three working conditions are set, that is, no damage , 10% section loss rate crack, 25% section loss rate crack.

[0092] 2) The arbitrary waveform generator generates a pulse signal modulated by the Hanning window, which is amplified by the power amplifier, and then the transducer is excited by the guided wave, and the guided wave signal of a specific frequency is excited in the pipeline, and the guided wave propagates along the pipeline. Go through all positions of the pipeline.

[0093] 3) The measured signals of the three working condi...

Embodiment 3

[0138] Such as Figure 11 As shown, this embodiment provides a pipeline guided wave damage identification and positioning device, which includes an acquisition module 1101, an establishment module 1102, a calculation module 1103, an identification module 1104 and a positioning module 1105. The specific functions of each module are as follows:

[0139] The acquiring module 1101 is configured to acquire a guided wave sampling signal; wherein, the guided wave sampling signal is a time history signal of the sampled guided wave propagating in the pipeline.

[0140] The establishment module 1102 is used to establish an appropriate driving force amplitude through information entropy, and establish a Duffin oscillator chaotic system capable of detecting guided wave signals of a specific frequency.

[0141] The calculation module 1103 is used to input the guided wave sampling signal into the established Duffin oscillator chaotic system, scan the guided wave sampling signal along the ti...

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Abstract

The invention discloses a pipeline guided wave damage identification and positioning method, device and system based on information entropy. The pipeline guided wave damage identification and positioning method comprises the following steps of: acquiring a guided wave sampling signal; determining a proper driving force amplitude through information entropy, and establishing a Duffing oscillator chaotic system capable of detecting a specific frequency guided wave signal; inputting the guide wave sampling signal into the established Duffing oscillator chaotic system, scanning the guide wave sampling signal along a time axis by defining a rectangular window time shift function, and calculating the information entropy of each window; and if the information entropy of all the windows between the incident waves and the end face echoes are constantly equal to 0, determining that the pipeline is not damaged, if the windows with the information entropy larger than 0 exist between the incident waves and the end face echoes, determining that the pipeline is damaged, determining the moments corresponding to the windows where the incident waves, the end face echoes and the damage echoes are located through utilizing curve peak values of the information entropy, and positioning a damage through utilizing a time-distance proportional relation. According to the pipeline guided wave damage identification and positioning method, the device and the system, the robustness and sensitivity of pipeline damage detection are improved.

Description

technical field [0001] The invention relates to a guided wave detection technology, in particular to a method, device and system for identifying and locating pipeline guided wave damage based on information entropy, belonging to the technical field of nondestructive testing. Background technique [0002] Pipeline transportation plays the role of adjusting energy between the whole country and even intercontinental, and has the advantages of large carrying capacity, continuous transportation, not restricted by other factors such as climate, and low cost. However, after the pipeline is installed and put into use, it will inevitably face potential threats from factors such as burial, the environment of the erection area, and man-made damage during its service period, resulting in damage to the internal and external surfaces of the pipeline and even the interior of the pipeline. Therefore, in order to ensure the operation safety of the pipeline, the damage detection technology of...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01N29/07G01N29/44
CPCG01N29/07G01N29/44
Inventor曾紫焰马宏伟武静林荣刘仲铭倪海忠
OwnerJINAN UNIVERSITY