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Baseline-free detection and location method of steel plate defects with welded seams based on impaired reciprocity

A positioning method and reciprocity technology, applied in the field of non-baseline detection and positioning of steel plate defects with welded seams based on impaired reciprocity, can solve the problems of difficult acquisition of baseline data, achieve accurate positioning, high engineering application value, Imaging results are clear

Active Publication Date: 2022-06-07
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

However, most of the current research is based on baseline subtraction to obtain defect information, and baseline (health) data is difficult to obtain in engineering practice, so there are great limitations

Method used

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  • Baseline-free detection and location method of steel plate defects with welded seams based on impaired reciprocity
  • Baseline-free detection and location method of steel plate defects with welded seams based on impaired reciprocity
  • Baseline-free detection and location method of steel plate defects with welded seams based on impaired reciprocity

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Embodiment

[0047] figure 1 It is a flow chart of the present invention. like figure 1 As shown, this example provides a method for baseline-free detection and location of defects in welded steel plates based on impaired reciprocity, including the following steps:

[0048] Step 1: Collect the guided wave detection signal in the welded steel plate, the specific steps are as follows:

[0049] Step 1-1: Arrange 18 (n=9) piezoelectric wafer sensors on a 1000mm×1000mm×3mm steel plate with welded seams, the diameter of the piezoelectric wafer is 10mm, and the thickness is 1mm. Among them, the welding seam is in the center of the steel plate, the lower left corner of the steel plate is taken as the coordinate origin to establish a rectangular coordinate system, and a steel ingot is set between the sensor on one side and the welding seam, the diameter of the steel ingot is 10mm, and the defects are simulated, and the coordinates are (420, 360), such as figure 2 (weld means weld in the figure,...

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Abstract

The present invention relates to a method for non-baseline detection and positioning of steel plate defects with welded seams based on impaired reciprocity, comprising the following steps: Step 1: arranging a parallel linear sensor array, and setting steel ingots to simulate defects and then collecting reciprocity signals; Step 2: Define the signal difference coefficient after preprocessing the reciprocity signal, and do correlation quantitative analysis for each pair of preprocessed reciprocity signals; Obtain the pair with the largest signal difference coefficient (impaired reciprocity) in each group from the multiple sets of multiple pairs of reciprocity signals obtained by excitation reception, and connect the corresponding sensors to obtain multiple sets of connections and corresponding intersection points; Step 4: A clustering algorithm is used to finally determine the defect location for multiple groups of connecting lines and corresponding intersection points. Compared with the prior art, the present invention gets rid of the dependence on baseline data without damage to the inspected object, realizes baseline-free detection and positioning, and is closer to practical engineering applications.

Description

technical field [0001] The invention relates to the technical field of ultrasonic guided wave nondestructive testing of steel plate structures with welded seams, in particular to a baseline-free detection and positioning method for defects of welded steel plates with damaged reciprocity. Background technique [0002] Ultrasonic Lamb wave has the advantages of small attenuation, high sensitivity, no need to destroy the structure of the object to be inspected, simple and convenient detection equipment, etc., and can realize a wide range of detection, which makes the ultrasonic Lamb detection method widely used in the field of non-destructive testing of structures. health monitoring. [0003] However, due to the inherent multi-modal characteristics and dispersion characteristics of Lamb waves, when it propagates in some complex structures (such as plates with welded seams), the signal is complex and the signal-to-noise ratio is not high, which reduces the detection accuracy and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/24G01N29/44G06K9/62G06T5/00G06T7/00
CPCG01N29/041G01N29/2437G01N29/4472G06T7/0008G01N2291/0234G01N2291/106G06T2207/10132G06T2207/30136G06F18/23213G06T5/70
Inventor 周邵萍何天浩李沁霏李勇邢改兰
Owner EAST CHINA UNIV OF SCI & TECH
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