Ultrasonic guided wave detection device for quality evaluation of composite laminated plate

Abstract

The invention provides an ultrasonic guided wave detection device for quality evaluation of a composite laminated plate. In the device, ultrasonic guided wave is taken as a detection means for accurately and conveniently evaluating quality of the composite laminated plate. The detection means is achieved by the following steps: (a) performing time-frequency analysis on guided wave signals of the composite laminated plate, comparing a time-frequency distribution diagram of the signals with a theoretical time-frequency distribution curve of the guided wave, and providing a mode separation method; (b) obtaining accurate time delay information in a time-frequency domain based on good characteristics of a Gabor wavelet, combining optimal sensor placement and multi-path positioning, broadening the range of defect positioning, introducing cluster analysis and then improving accuracy and reliability of two-dimensional positioning; and (c) improving rationality and accuracy for extracting signal characteristics, and effectively separating various mode components from ultrasonic guided wave signals by adopting an improved HTT method, and taking instantaneous components as a characteristic parameter according to linear regression analysis; and (d) constructing a detection device of the ultrasonic guided wave signals, improving detection steps, designing software architecture and programming for processing the guided wave signals based on the time-frequency analysis.

Description

technical field [0001] The ultrasonic guided wave detection device used for quality assessment of composite laminates determines whether there is a defect, the location and size of the defect according to the characteristics of the composite laminate. Background technique [0002] In the prior art, the acoustic emission detection method is widely used for the quality assessment of composite laminated boards. Acoustic emission (AE) refers to the phenomenon that the local material emits sound waves due to the rapid release of energy. Since the acoustic emission signals come from defects, the acoustic emission signals of different defects are also different. The acoustic emission signals are collected by the receiving sensor, and through signal processing, according to the signal characteristics to determine the location of the source of the acoustic emission. The advantage of acoustic emission detection technology is that it can realize dynamic and real-time detection. Howeve...

AI Technical Summary

Problems solved by technology

The advantage of acoustic emission detection technology is that it can realize dynamic and real-time detection, but when the acoustic wave is severely attenuated in the propagation path, the detection accuracy is difficult to guarantee, and because it is a passive detection method, its operability is limited

Images