An Improved Method for Domain Transformation of Dispersive Ultrasonic Guided Wave Signals

An ultrasonic guided wave and signal domain technology, which is applied in the processing of the detected response signal, the generation of ultrasonic/sonic/infrasonic waves, and the analysis of solids using sonic/ultrasonic/infrasonic waves. and other problems to achieve the effect of improving resolution, reducing space width, and facilitating signal analysis and processing

Active Publication Date: 2019-04-23
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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  • An Improved Method for Domain Transformation of Dispersive Ultrasonic Guided Wave Signals
  • An Improved Method for Domain Transformation of Dispersive Ultrasonic Guided Wave Signals
  • An Improved Method for Domain Transformation of Dispersive Ultrasonic Guided Wave Signals

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Embodiment Construction

[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 dispersive ultrasonic guided wave signal domain transformation method, which belongs to the field of ultrasonic guided wave structural health monitoring. The method includes the following steps: (1) Obtaining the dispersive wavenumber curve and non-dispersive wavenumber curve of the ultrasonic guided wave signal mode; (2) Calculating the excitation waveform of the ultrasonic guided wave in the distance domain with reduced space width; (3) Obtaining the ultrasonic guided wave Guided wave distance domain impulse response signal; (4) Calculate and obtain non-dispersive ultrasonic guided wave distance domain signal with enhanced resolution. Compared with the traditional time-distance domain signal conversion method, the present invention not only recompresses the dispersion-expanded wave packets in the original ultrasonic guided wave time-domain signal through dispersion compensation, but also changes the distance scale of the excitation waveform to further reduce the ultrasonic guided wave. The distance domain width of each wave packet in the wave signal can be used to enhance the spatial resolution of the original dispersed ultrasonic guided wave signal more effectively.

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 Patents(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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