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TR and Duffing system combined ultrasonic guided wave small defect positioning and detecting method

An ultrasonic guided wave, positioning detection technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve the problems of small defect signals being interfered by the outside world and the inability to determine the location information of small defects.

Active Publication Date: 2016-09-21
CHINA JILIANG UNIV
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Problems solved by technology

[0004] The purpose of this invention is to solve the problem that the position information of small defects cannot be determined by external interference in the current ultrasonic guided wave pipeline detection, and proposes a small defect location detection with ultrasonic guided waves combined with time reversal and Duffin system method

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  • TR and Duffing system combined ultrasonic guided wave small defect positioning and detecting method

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Embodiment Construction

[0033] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] Such as figure 1 As shown, a kind of TR and the Duffing system combination ultrasonic guided wave small defect localization detection method that the present invention provides, this method comprises the following steps:

[0035] (1) Excite the ultrasonic guided wave signal S=f sin(wt) modulated by the Hanning window on one end surface A of the pipeline, and excite the guided wave of the pipeline mode, which is commonly used in the L(0,2) mode, T(0,1) The mode is used as the signal to be detected, so that the ultrasonic guided wave traverses all positions of the pipeline;

[0036] (2) The receiving end B near the excitation end (according to the different detection sites, the distance between the AB end is also different, generally about 10 meters) receives the echo signal of the ultrasonic guided wave and records the time cou...

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Abstract

The invention discloses a TR and Duffing system combined ultrasonic guided wave small defect positioning and detecting method, and belongs to the field of nondestructive detection signal analysis. The method comprises the following steps: exciting an ultrasonic guided wave signal at one end surface of a pipeline to make ultrasonic guided waves traverse through all positions of the pipeline; receiving the ultrasonic guided wave signal at the other end surface nearby an excitation end, and recording the propagating time history curve of the ultrasonic guided waves in the pipeline; detecting and analyzing an ultrasonic guided wave echo signal by using an improved Duffing chaotic system, and extracting and identifying small defect information killed in noises; carrying out time reversal on the obtained signal with small defect information, and carrying out secondary excitation; and receiving the reversal signal. The method has the advantages of realization of satisfactory noise inhibition to obtain a small defect weak signal, accurate identification of the small defect position 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 small crack defect, and good practical engineering application value.

Description

technical field [0001] The invention relates to a guided wave signal analysis method based on time delay, which belongs to the field of nondestructive testing signal analysis, in particular to an ultrasonic guided wave small defect location detection method combined with a TR (time reversal) and Duffing (Duffing) system. Background technique [0002] Ultrasonic guided wave testing technology is a new technology for long-distance pipeline testing developed in recent years. Compared with the traditional detection technology, it has the advantages of long detection distance, high detection efficiency, fast detection speed, and large detection range. It can detect complex working conditions such as coatings and buried pipelines, and pipelines in complex environments, and can perform online detection, etc. advantage. [0003] Affected by factors such as pipeline medium, pipeline temperature, and pipeline material, as well as dispersion and multi-mode in the propagation of the gu...

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Application Information

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IPC IPC(8): G01N29/07
CPCG01N29/07
Inventor 王强谷涛谷小红范昕炜
Owner CHINA JILIANG UNIV
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