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Damage identification method and system based on ultrasonic guided waves

A damage identification and ultrasonic guided wave technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, and processing response signals of detection, etc. It can solve the requirement for prior knowledge of guided waves , the problem of high cost, to achieve the effect of reducing the difference in damage index, accurate identification, and reducing the impact

Active Publication Date: 2022-01-21
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Time-of-flight-based imaging algorithms mainly include triangulation method, four-point arc method, etc. This type of algorithm needs to calculate the propagation mode and velocity of the wave in the structure in advance, so the prior knowledge of the guided wave propagation in the structure is relatively small. High; the imaging algorithm based on the damage index is mainly probabilistic imaging. By comparing the reference signal with the detection signal, the signal difference is quantified, and then the damage is judged, but this is related to the number of paths. The more paths, the denser the sensor network The better the imaging effect, the higher the cost

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  • Damage identification method and system based on ultrasonic guided waves
  • Damage identification method and system based on ultrasonic guided waves
  • Damage identification method and system based on ultrasonic guided waves

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Embodiment 1

[0042] like figure 1 As shown, Embodiment 1 of the present invention provides a damage identification method based on ultrasonic guided waves. Through a new calculation method of damage index, the influence of different damage forms on its calculation is reduced; by setting a threshold value for the damage index to remove It has nothing to do with the path, and then solves the problem of large amount of data and external errors affecting the positioning accuracy, so as to achieve the purpose of data lightweight; when processing the scattering signal, a weight function is introduced to reduce the influence of crosstalk and noise on the time-of-flight solution Influence; the introduction of three-dimensional space coordinates in the calculation solves the damage location of complex plate structures such as hyperbolic plates other than the current plate structure.

[0043] Specifically, the following processes are included:

[0044] S1: Damage imaging algorithm based on path opt...

Embodiment 2

[0101] Embodiment 2 of the present invention provides a damage identification system based on ultrasonic guided waves, including:

[0102] The data acquisition module is configured to: acquire the reference signal and the damage signal;

[0103] The damage index calculation module is configured to: perform correlation analysis on the obtained reference signal and the damage signal, and perform damage index calculation based on the correlation analysis result;

[0104] The path selection module is configured to: according to the damage index of each path, remove the corresponding path lower than the preset threshold, and only keep the path affected by the damage;

[0105] The time-of-flight calculation module is configured to: solve the time-of-flight using complex continuous wavelet transform by weighting the scattering signal of the path affected by the damage;

[0106] The damage probability calculation module is configured to: bring the flight time and damage index into th...

Embodiment 3

[0110] Embodiment 3 of the present invention provides a computer-readable storage medium on which a program is stored. When the program is executed by a processor, the steps in the method for identifying damage based on ultrasonic guided waves as described in Embodiment 1 of the present invention are implemented.

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Abstract

The invention provides a damage identification method and system based on ultrasonic guided waves. The method comprises the following steps: acquiring a reference signal and a damage signal; performing correlation analysis on the obtained reference signal and the damage signal, and performing damage index calculation based on a correlation analysis result; according to the damage index of each path, removing corresponding paths lower than a preset threshold value, and only reserving the paths influenced by damage; carrying out weighted operation on scattered signals of a path influenced by damage, and solving flight time by utilizing complex continuous wavelet transform; the flight time and the damage index being substituted into a probability fusion framework, and obtaining the probability that damage exists in different positions. According to the method, an improved probability damage imaging algorithm is fused with an elliptical orbit method, damage characteristic values of remaining paths after path screening are input into a probability fusion framework, and accurate damage identification is realized on the premise of data lightweight.

Description

technical field [0001] The present invention relates to the technical field of structural damage identification, in particular to a damage identification method and system based on ultrasonic guided waves. Background technique [0002] The statements in this section merely provide background technology related to the present invention and do not necessarily constitute prior art. [0003] High-performance lightweight metal materials and carbon fiber reinforced composite materials are widely used in various structural parts of high-end equipment such as ships, aircrafts, and high-speed rails. Structural health monitoring of structural parts has always been a current hot research issue. [0004] For example, as a typical representative of structural components, during long-term service, due to high-intensity loads and complex and changeable environments, the reliability of plate structures will be reduced, and the surface of the structure will be damaged. In addition to the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/041G01N29/4454G01N2291/023
Inventor 姜明顺张宏魏钧涛张法业张雷贾磊
Owner SHANDONG UNIV