A non-destructive testing method for micro-defects in long-distance thin-plate structures

Abstract

The invention discloses a nondestructive detection method for micro-defects of long-distance thin plate structure, comprising the following steps: establishing a mechanical model of long-distance thin plate structure based on the long-distance thin plate to be measured; randomly generating multiple sets of different defect data information in the mechanical model, Calculate the dynamic displacement response data of each defect data information at the observation point under the action of dynamic load; pre-build an artificial neural network model, use the defect data information and dynamic displacement response data to train the artificial neural network model, and establish the micro-defects of the long-distance thin plate structure data information prediction model; obtain the measured dynamic displacement signal; input the measured dynamic displacement signal into the micro-defect data information prediction model to obtain the micro-defect data information prediction value of the long-distance thin plate to be measured. The invention can quickly and quantitatively detect the micro-defect information of the long-distance thin plate structure through the Lamb wave emission signal.

Description

technical field [0001] The invention relates to a non-destructive testing method, in particular to a non-destructive testing method for long-distance thin plate structure micro-defects, and belongs to the technical field of health monitoring of engineering structures. Background technique [0002] Damage identification is an important part of the health monitoring of engineering structures, and has become a research hotspot at home and abroad in recent years. According to the detection object and the scope of identification, structural damage identification technology can be divided into local damage identification and overall damage identification macroscopically. Local detection methods are traditional visual or local test methods, such as drilling core method, ultrasonic method, radar method, infrared imaging method, etc. These detection methods basically need to know the general position of structural damage in advance, and the sampling point Limited, often missing area...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiency of the difficulty in detecting micro-defects in long-distance thin-plate structures in the prior art, and provide a non-destructive detection method for micro-defects in long-distance thin-plate structures. The technical solution is as follows:

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