Baseline-free detecting and positioning method for defects of a welded steel plate based on reciprocity damage
A positioning method and reciprocity technology, which are applied in the field of non-baseline detection and localization of defects in welded steel plates with damaged reciprocity, can solve problems such as difficulty in obtaining baseline data, and achieve accurate positioning, high engineering application value, Imaging results are clear
Active Publication Date: 2019-12-17
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
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[0047] figure 1 It is a flowchart of the present invention. Such as figure 1 As shown, this example provides a baseline-free detection and location method for steel plate defects with welded seams based on impaired reciprocity, including the following steps:
[0048] Step 1: Collect the guided wave detection signal in the steel plate with welded seam, 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 a welded seam, the diameter of the piezoelectric wafer is 10mm, and the thickness is 1mm. Among them, the weld is in the center of the steel plate, and the lower left corner of the steel plate is taken as the coordinate origin to establish a rectangular coordinate system. A steel ingot is set between the sensor on one side and the weld. figure 2 As shown, (weld in the figure represents the weld, and defect represents the defect). The array type composed of sensors is a parallel linear arr...
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The invention relates to a baseline-free detecting and positioning method for defects of a welded steel plate based on reciprocity damage, which comprises the following steps: S1, arranging a parallellinear sensor array, and collecting reciprocity signals after setting steel ingot simulation defects; S2, preprocessing the reciprocity signals, defining a signal difference coefficient, and performing correlation quantitative analysis on each pair of preprocessed reciprocity signals; S3, obtaining a pair of reciprocity signals with the maximum signal difference coefficient (reciprocity damage) in each group from a plurality of groups of pairs of reciprocity signals obtained through sequential interactive excitation and reception by each upper side sensor and each lower side sensor in the parallel linear sensor array, and connecting the corresponding sensors to obtain a plurality of groups of connecting lines and corresponding intersection points; and S4, determining a defect position finally by adopting a clustering algorithm according to the multiple groups of connecting lines and the corresponding intersection points. Compared with the prior art, the method gets rid of dependence on baseline data of a detected object without damage, realizes baseline-free detecting and positioning, and is closer to engineering practical application.
Description
technical field [0001] The invention relates to the technical field of ultrasonic guided wave non-destructive testing of steel plate structures with welds, in particular to a baseline-free detection and positioning method for defects in steel plates with welds based on impaired 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. health monitoring. [0003] However, due to the inherent multi-mode and dispersion characteristics of the Lamb wave, when it propagates in some complex structures (such as plates with welds), the signal is complex and the signal-to-noise ratio is not high, which reduces the detection accuracy and even causes false detection. ,...
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Login to View More 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