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Method for identifying ultrasonic guided wave of oblique crack pipeline through utilizing improved Duffing chaotic system

An ultrasonic guided wave and chaotic system technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve the problems of manpower, material waste, lack of scientific maintenance, and high risk of missed inspection, so as to reduce economic losses and reduce maintenance costs. , the effect of improving the detection efficiency

Inactive Publication Date: 2013-09-25
JINAN UNIVERSITY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional pipeline damage detection methods, such as ultrasonic testing, magnetic leakage testing, and radiographic testing, have to scan the structure point by point. For large structures such as pipelines, traditional methods are time-consuming, laborious, and have a high risk of missed detection. Restricted by the above-mentioned detection methods, most of the pipeline damage is unknown, often resulting in blind excavation, blind scrapping, and lack of scientific maintenance, resulting in a huge waste of manpower and material resources

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  • Method for identifying ultrasonic guided wave of oblique crack pipeline through utilizing improved Duffing chaotic system
  • Method for identifying ultrasonic guided wave of oblique crack pipeline through utilizing improved Duffing chaotic system
  • Method for identifying ultrasonic guided wave of oblique crack pipeline through utilizing improved Duffing chaotic system

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Embodiment 1

[0042] Such as figure 1 As shown, this embodiment takes a specific pipeline as an example to identify oblique crack defects in the pipeline, as follows:

[0043] 1) Excite the ultrasonic guided wave signal on one side of the specific pipeline, so that the ultrasonic guided wave traverses all positions of the pipeline. The experimental process is as follows:

[0044] a) use three-dimensional drawing software to establish the geometric model of the pipeline, wherein the diameter of the pipeline model is 40mm, and the length is 4m, such as figure 2 shown;

[0045] b) Divide 4 oblique crack defect units at 2m from the central position of the pipeline model, where the thickness of each unit is 1mm, the length is 16mm, and the angles are 15°, 30°, 45° and 90° respectively, as Figures 3a-3d shown;

[0046] c) Define the material and parameters of the pipeline model, where the material is steel and the density is ρ=7.85×10 3 kg / m 3 , elastic modulus E=200GPa, Poisson's ratio μ=...

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Abstract

The invention discloses a method for identifying the ultrasonic guided wave of an oblique crack pipeline through utilizing an improved Duffing chaotic system. The method comprises the following steps: 1, exciting an ultrasonic guided wave signal on the end surface at one side of the pipeline, and allowing the ultrasonic guided wave to traverse all the positions of the pipeline; 2, receiving an ultrasonic guided wave echo signal at the receiving end near the above exciting end, and recording the time history curve of the ultrasonic guided wave propagating in the pipeline, wherein the ultrasonic guided wave echo signal includes an end surface echo signal, a noise signal and an oblique crack defect signal falling into the noise; and 3, detecting and analyzing the ultrasonic guided wave echo signal by utilizing the improved Duffing chaotic system, and extracting and identifying oblique crack defect information falling into the noise to obtain the oblique crack defect condition of the whole pipeline. The method has the advantages of accurate identification of the oblique crack defect in the pipeline, defect detection efficiency increase, maintenance cost reduction, effective prolongation of the ultrasonic guided wave detection range, increase of the detection sensitivity of the slightly-oblique crack defect, and practical engineering application value.

Description

technical field [0001] The invention relates to a method for identifying oblique crack defects in pipelines, in particular to a method for identifying oblique crack pipeline ultrasonic guided waves by using an improved Duffin chaotic system, which belongs to the technical field of damage detection in the pipeline transportation industry. Background technique [0002] As one of the five major transportation industries alongside railways, highways, aviation, and water transportation, pipeline transportation is one of the important components of the comprehensive transportation of the national economy, and it is also the main indicator to measure whether a country's energy and transportation industries are developed. However, pipelines inevitably face potential threats from corrosion, buried (or erected) environment, and man-made damage during their service period. Once a pipeline ruptures, the consequences will be disastrous. Therefore, it is necessary to analyze and identify ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
Inventor 马宏伟杨飞莫应强林荣武静张伟伟张喆斯
Owner JINAN UNIVERSITY
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