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Damage Discrimination and Damage Expansion Identification Methods for Guided Wave Detection

An identification method and guided wave technology, which are applied in the processing of detected response signals and the use of sonic/ultrasonic/infrasonic waves to analyze solids, etc., can solve the problems of missed or misjudged, complex guided wave modes, and incompletely clear mechanisms, etc. achieve high accuracy

Active Publication Date: 2020-05-22
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mode conversion of guided wave carries damage information, but because its mechanism is not completely clear, it often becomes the difficulty of guided wave detection signal processing
The researches of Hayashi et al. [5] and Lu Chao et al. [6] show that the guided wave modes of asymmetric components such as rails are more complex than those of symmetrical components such as pipes. In this case, the existing methods in practice It is more likely to be interfered by multi-mode waveforms, especially for small damages, which can easily lead to missed or misjudged

Method used

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  • Damage Discrimination and Damage Expansion Identification Methods for Guided Wave Detection
  • Damage Discrimination and Damage Expansion Identification Methods for Guided Wave Detection
  • Damage Discrimination and Damage Expansion Identification Methods for Guided Wave Detection

Examples

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Embodiment 1

[0053] Such as figure 1 As shown, this embodiment provides a damage discrimination and damage extension recognition method, the method includes the following steps:

[0054] S1. Obtain the guided wave signal of the comparison member.

[0055] The comparison component is an intact component, which has the same specifications as the tested component. To obtain the guided wave signal of the comparison component, firstly, according to the actual detection requirements, a guided wave is excited in the comparison component, so that the guide wave The wave propagates in the detection area, and then the guided wave is received by the transducer, and the guided wave signal is used as the guided wave signal of the comparison member; preferably, the excited guided wave is one or more specific types suitable for nondestructive testing. Modal guided waves.

[0056] In the detection process of the above-mentioned guided wave, the same probe can be used for the excitation and reception of ...

Embodiment 2

[0075] This embodiment is used for the damage discrimination and damage expansion identification of rail flaw detection. For the convenience of explanation, the basic rail with a length of 5.62 meters is selected as the detection object without loss of generality. The side cracked rail was used as the tested member, and its damage extended from 5.5mm deep to 7.7mm deep.

[0076] The damage discrimination and damage extension recognition method in this embodiment includes the following steps:

[0077] 1) Near one end of the intact rail, 50kHz is used as the excitation center frequency to excite the vertical bending mode guided wave propagating along the length direction of the rail, which is used for rail flaw detection, and a transducer with broadband characteristics is used to receive the wave in the rail at the same end guided wave, the received signal as Figure 4 As shown, it is easy to see the excitation wave, the front (excitation end) echo and the end echo.

[0078] 2...

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Abstract

The invention discloses a recognition method for damage differentiation and damage expansion of guided wave detection. The method comprises the steps of acquiring guided wave signals of a comparison member and a detected member, analyzing and comparing the guided wave signals of the comparison member and the detected member, determining that a detection area of the detected member has damage if adamage echo signal waveform characteristic appears in a certain frequency range and guided wave energy has a frequency component with abnormal increase or decrease, detecting the detected member for many times when judging that the detected member has the damage, comparing the guided wave signal of the detection for many times, and determining that the detected member has the damage expansion if one of the damage echo signal waveform characteristic of the corresponding frequency component, and guided wave energy transfer of the different frequency components is different. The method can effectively recognize the damage and the damage expansion under a complicated guided wave modal condition, so that the risk of judgement miss or erroneous judgement is greatly reduced; the calculation loadis low; and the on-site detection requirements are met.

Description

technical field [0001] The invention relates to a guided wave detection technology, in particular to a damage discrimination and damage extension identification method for guided wave detection, which belongs to the technical field of nondestructive detection. Background technique [0002] Guided wave testing (or guided wave testing) is a hot technology in the field of non-destructive testing, mainly used in non-destructive testing (or non-destructive testing) of slender and plate-shaped components such as pipes, rods, and rails. Compared with traditional ultrasound, guided wave detection has the advantages of long single detection distance, high detection efficiency, and simultaneous detection of internal and external damage. [0003] The propagation characteristic of guided wave is an important content of guided wave detection, which can be described by dispersion curve and wave structure. In the component under test, the guided wave propagates in a specific mode. The pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/44
Inventor 林荣温宇立马延鋆马宏伟
Owner DONGGUAN UNIV OF TECH