Composite material ultrasonic guided wave structure health monitoring method in variable temperature environment

Abstract

The invention discloses a composite material ultrasonic guided wave structure health monitoring method in a variable temperature environment. The method comprises the steps: constructing a reference coefficient set of a structure health monitoring network through calculating a difference index between reference signals in a reference signal set; and performing reference screening and calculating adamage index according to the temperature information of the signals acquired in real time, solving a damage proportionality coefficient under each propagation path in combination with the referencecoefficient, importing the damage proportionality coefficient into a detection network to perform actual damage path screening, and finally outputting the position of the damage in combination with adamage positioning imaging algorithm. The composite material ultrasonic monitoring method provided by the invention can effectively remove the influence of the anisotropism of the composite material on ultrasonic propagation, can effectively eliminate the interference of environmental factors on ultrasonic signals, and can quickly realize the accurate positioning of damage.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing and structural health monitoring, in particular to an ultrasonic structural health monitoring method applied to composite materials. Background technique [0002] With the continuous improvement of industry's requirements for lightweight, composite materials are more and more used in aerospace and high-speed trains and other fields. The high manufacturing cost poses a severe challenge to the non-destructive testing technology of composite materials. After continuous research, development and improvement, ultrasonic testing technology is currently widely used in the monitoring of composite material structures due to its advantages of fast transmission speed, wide coverage and high sensitivity, and is one of the most important composite material testing technologies. In practical applications, ultrasonic waves are interfered by their own anisotropy when propagating in composite mater...

AI Technical Summary

Problems solved by technology

However, in practical engineering applications, a high-density sensor network is costly, and the amount of data generated by a single scan is too large, which requires high device storage and CPU computing performance.

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