RAPID (reconstruction algorithm for probabilistic inspection of damage) chromatography-based nondestructive identification method of mechanical structure damages

A technology of mechanical structure and recognition method, which is applied in the direction of analyzing solids by using sound wave/ultrasonic wave/infrasonic wave, which can solve the problems of not being able to determine whether the damage distribution map is correct, the image resolution is not high enough, misjudgment and missed judgment, etc., to achieve accurate Diagnosis and localization, improvement of image resolution, effect of accurate diagnosis and localization

Active Publication Date: 2013-02-13
XI AN JIAOTONG UNIV
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Problems solved by technology

[0016] The above algorithm has many deficiencies: 1) The resolution of the image obtained by this reconstruction algorithm is not high enough; 2) When there is damage outside the detection area, it will interfere with the location of the damage inside the detection area; 3) When the detection area When there are two or more defects in the area, it is impossible to accurately dis

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  • RAPID (reconstruction algorithm for probabilistic inspection of damage) chromatography-based nondestructive identification method of mechanical structure damages
  • RAPID (reconstruction algorithm for probabilistic inspection of damage) chromatography-based nondestructive identification method of mechanical structure damages
  • RAPID (reconstruction algorithm for probabilistic inspection of damage) chromatography-based nondestructive identification method of mechanical structure damages

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[0057] The present invention will be described in detail below, which is an explanation rather than a limitation of the present invention.

[0058] A non-destructive identification method of mechanical structure damage based on RAPID tomography, through the form of sensor array, and based on this, a tomographic algorithm based on local imaging is established, through local reconstruction and data truncation in the sector, different damages are eliminated The interference between them and the influence of external interference sources in the measured area effectively realize the diagnosis and location of multiple damages, including the following steps:

[0059] 1) Set a piezoelectric sensor on the mechanical structure to be tested. The piezoelectric sensor includes a central piezoelectric sensor and several peripheral sensors. The piezoelectric sensor is used as the excitation end of the signal or the receiving end of the signal;

[0060] 2) In the initial undamaged state of th...

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Abstract

The invention discloses an RAPID (reconstruction algorithm for probabilistic inspection of damage) chromatography-based nondestructive identification method of mechanical structure damages. An RAPID chromatography algorithm based on partial imaging is established by providing a new sensor array form and taking the new sensor array form as a basis, the interference among different damages and the influence of an external interference source of a detected area are eliminated through data truncation and partial reconstruction in sub areas in the nondestructive identification of the mechanical structure damage, therefore, not only is the external interference eliminated, but also the accurate diagnosis and location of multiple damages or single damage are effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of mechanical damage diagnosis and relates to a non-destructive identification method for mechanical structure damage based on RAPID chromatography. Background technique [0002] Lamb wave is a kind of ultrasonic guided wave. Its long-distance propagation, multi-mode, dispersion and other characteristics make Lamb wave widely used in the field of non-destructive testing. To detect the existing damage by reconstructing the image of the structure, that is, tomographic technology, is an effective detection method. Lamb wave tomographic technology realizes the visualization of structural damage, and its focus is on the research of reconstruction algorithms. RAPID algorithm (Reconstruction algorithm for probabilistic inspection of damage, reconstruction algorithm based on the probability of damage) has become the focus of attention because of its sensitivity to damage, simple and flexible sensor distribution, etc...

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Application Information

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IPC IPC(8): G01N29/07
Inventor 林京曾亮华佳东施文曹军义王琇峰雷亚国廖与禾
Owner XI AN JIAOTONG UNIV
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