Improved frequency dispersion ultrasonic guided wave signal domain transformation method

An ultrasonic guided wave and signal domain technology, which is applied in the processing of detection response signals, the generation of ultrasonic/sonic/infrasonic waves, and the use of sound waves/ultrasonic/infrasonic waves to analyze solids, etc., can solve the problem of not considering signal wave packets and limiting signal resolution and other issues, to achieve the effect of improving resolution, reducing space width, and facilitating signal analysis and processing

Active Publication Date: 2018-03-16
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0004] The proposed time-distance domain transformation method only improves the signal resolution through dispersion compensation and then compresses the original dispersion-expanded signal wave packet, without considering the influence of the signal wave packet itself on the larger width of the distance domain, thus limiting Further improvement in signal resolution

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  • Improved frequency dispersion ultrasonic guided wave signal domain transformation method
  • Improved frequency dispersion ultrasonic guided wave signal domain transformation method
  • Improved frequency dispersion ultrasonic guided wave signal domain transformation method

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[0043] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through implementation with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the embodiment of the present invention. Some, but not all, embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0044] This embodiment will use the A spread in the LY21 aluminum plate structure 0 Mode Lamb wave, a typical ultrasonic guided wave, is used as the research object. The size of the aluminum plate is 1200mm×1000mm×1.5mm. The material parameters are shown in Table 1.

[0045] Table 1. Aluminum plate material parameters

[0046] Thickness d(mm)

D...

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Abstract

The invention provides an improved frequency dispersion ultrasonic guided wave signal domain transformation method, and belongs to the field of ultrasonic guided wave structure health monitoring. Themethod includes the following steps: (1) obtaining the frequency dispersion wave number curve and the frequency non-dispersion wave number curve of an ultrasonic guided wave signal mode; (2) calculating the ultrasonic guided wave distance domain excitation waveform with a reduced space width; (3) calculating an ultrasonic guided wave distance domain impulse response signal; and (4) calculating a resolution enhanced non-dispersive ultrasonic guided wave distance domain signal. Compared with traditional time-distance domain signal transformation methods, the method provided by the invention recompresses a frequency dispersion-expanded wave packet in the original ultrasonic guided wave time domain signal through dispersion compensation and changes the distance scale of the excitation waveformin order to further reduce the distance domain width of each wave packet in the ultrasonic guided wave signal, so the spatial resolution of the original frequency dispersion ultrasonic guided wave signal is effectively enhanced.

Description

technical field [0001] The invention relates to an improved method for transforming the signal domain of the dispersed ultrasonic guided wave, which belongs to the field of ultrasonic guided wave structure health monitoring. Background technique [0002] Structural health monitoring technology has important application value and broad application prospects for preventing major accidents, improving system safety, reducing economic losses, reducing system maintenance costs, and ensuring the successful construction of major engineering projects in our country. Ultrasonic guided wave is a kind of ultrasonic wave that exists in thin plate structures, such as Lamb waves in thin plates and ultrasonic guided waves that propagate longitudinally and transversely in pipes. It has a long propagation distance and is sensitive to both internal and surface damage of the structure, so it is widely used in structural health monitoring. [0003] In the field of ultrasonic guided wave structu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/34B06B1/06G01N29/04
CPCG01N29/048G01N29/34B06B1/0603G01N2291/023G01N29/041G01N29/46G01N29/4472G01N2291/0232G01N2291/0258G01N29/2437
Inventor 蔡建袁慎芳邱雷
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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