Elongated metal structure damage detecting method and system based on active acoustic emission method

A metal structure, acoustic emission method, applied in the direction of material analysis using acoustic emission technology, can solve problems such as the difficulty of damage detection of long metal structures, and achieve the effect of improving detection accuracy and reducing the number of iterations

Active Publication Date: 2015-04-08
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

In recent years, with the complexity of elongated metal structures, the diversity of working environments, the limitations of detection methods, and the continuous improvement of structural manufacturing processes, the damage detection of elongated metal structures has become more and more difficult.

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  • Elongated metal structure damage detecting method and system based on active acoustic emission method
  • Elongated metal structure damage detecting method and system based on active acoustic emission method
  • Elongated metal structure damage detecting method and system based on active acoustic emission method

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Embodiment Construction

[0032] In order to make the purpose, technical solutions and advantages of the present invention clearer, the implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings:

[0033] see figure 1 , showing a damage detection method for elongated metal structures based on the active acoustic emission method, the method comprising the following steps:

[0034] Step 10 loads an initial excitation signal on the excitation transducer;

[0035] The signal generation module is composed of an FPGA circuit, which can generate an initial excitation signal, which is amplified by the power amplification module and applied to the excitation transducer on the near-end surface of the elongated metal structure to generate an acoustic signal that propagates in the elongated metal structure; The initial excitation signal generated by the generation module is a 5-peak sinusoidal modulation narrowband signal, ranging from 1K to 100...

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Abstract

The invention discloses an elongated metal structure damage detecting method and an elongated metal structure damage detecting system based on an active acoustic emission method. The method comprises the following steps of: loading an initial drive signal on a motivation energy converter; amplifying and collecting an initial structure response signal obtained by a far-end energy converter array; subtracting the initial structure response signal by an undamaged structure response signal by a different signal method to obtain an initial damage scattered signal; carrying out time reversal on the initial damage scattered signal to obtain a time reversal signal, amplifying the time reversal signal, and loading onto the far-end energy converter array; collecting a scattered signal after a far-end time reversal focus is damaged on a near-end energy converter array; carrying out iteration time reversal on the scattered signal after the far-end time reversal focus is damaged, and collecting an iteration time reversal-focused damaged scattered signal at the near-end energy converter array; and extracting an iteration time reversal-focused damaged scattered wave crest value as a characteristic parameter to diagnose the damage. According to the method, the instantaneity, the anti-interference performance, the veracity and the detecting efficiency for measuring the damage of the elongated metal structure can be improved, and the development tendency for detecting the damage of the elongated metal structure can be met.

Description

technical field [0001] The invention relates to the field of damage detection of elongated metal structures, in particular to a method and system for detecting damage of elongated metal structures based on an active acoustic emission method. Background technique [0002] Long-shaped metal structures in industrial environments generally include metal pipes, steel hinges, metal rods, metal beams and other industrial structures with long service lengths, which are widely used in major industries and sectors of the national economy such as ports, mines, metallurgy, tourism, and construction. in the machinery. In recent years, with the complexity of long metal structures, the diversity of working environments, the limitations of detection methods, and the continuous improvement of structure manufacturing processes, damage detection of long metal structures has become more and more difficult. [0003] The structural changes of elongated metal structures increase the difficulty of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/14
Inventor 洪晓斌吴斯栋李年智刘桂雄
Owner SOUTH CHINA UNIV OF TECH
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