Structural damage assessment method based on ultrasonic guided-wave drive/sensing array

Abstract

The invention provides a structural damage assessment method based on an ultrasonic guided-wave drive / sensing array. The structural damage assessment method comprises the following steps: firstly, pre-arranging or bonding ultrasonic guided-wave sensing units on the surface of a structure to be tested to form an ultrasonic guided-wave sensing array, exciting the various ultrasonic guided-wave sensing units in turns to generate ultrasonic guided-wave signals, and receiving the reflected guided-wave signals of the internal damages / boundaries of the structure to be tested through the ultrasonic guided-wave sensing array; then carrying out chromatic dispersion removal processing on the reflected guided-wave signals, globally imaging the structure to be tested by virtue of a phased array imaging algorithm, and locating a damage area; finally, carrying out accurate quantitative analysis on damages in the damage area by virtue of a reverse time migration imaging technology based on a multiple signal classification method with regard to the damage area and on the basis of the reflected guided-wave signals. The method realizes rapid and accurate location and assessment on damages in large structures, the exploration capacity is greatly improved, and the needed labour and maintenance expense are also reduced.

Description

technical field [0001] The invention belongs to the field of damage detection, in particular to a structural damage assessment method based on an ultrasonic guided wave driving / sensing array. Background technique [0002] Large-scale engineering facilities are subject to external (environment / load, etc.) effects during their long-term operation, and are prone to corrosion, fatigue, cracks and other damages. The accumulation of damage will lead to failures of engineering facilities and even induce major accidents. The advanced technology of rapid online diagnosis and evaluation of structural damage and overall performance can provide safety and reliability guarantee for the long-term normal operation of various large-scale engineering facilities, key equipment, and engineering structures. [0003] Guided ultrasound waves (GUW) have been shown to play an important role in SHM / NDE. The damage assessment method based on multiple ultrasonic sensors or sensor arrays provides a me...

AI Technical Summary

Problems solved by technology

[0004] Despite many advantages, there are still challenges in the application of SHM technology based on sensor arrays

First, the complex structure in practical application will lead to reflection, scattering and mode conversion at the interface of the structure and damage, and the multi-mode mixed ultrasonic signal increases the difficulty of damage assessment

Second, existing damage assessment methods based on multiple ultrasonic sensors or sensor arrays are often too complex to be directly interpreted, and it is difficult to achieve a balance between computing resources and computing speed

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