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Ultrasonic guided-wave propagation distance sparse estimation method and detection system thereof

An ultrasonic guided wave and propagation distance technology, applied in the ultrasonic field, can solve the problems of low resolution and low distance accuracy, and achieve the effect of improving resolution, improving accuracy and reducing wave packet width.

Active Publication Date: 2019-03-29
XI AN JIAOTONG UNIV
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Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the present invention proposes a method for sparsely estimating the propagation distance of ultrasonic guided waves and its detection system, which overcomes the shortcomings of low accuracy and low resolution of the propagation distance of ultrasonic guided waves in the prior art

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  • Ultrasonic guided-wave propagation distance sparse estimation method and detection system thereof
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Embodiment Construction

[0059] Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and is not limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0060] It should be noted that certain terms are used in the specification and claims to refer to specific components. Those skilled in the art should understand that they may use different terms to refer to the same component. The specification and claims do not use differences in nouns as a way of distinguishing components, but use differences in functions of components as a criterion for distinguishing. "Includes" or "comprises" mentioned throughout the spe...

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Abstract

The invention discloses an ultrasonic guided-wave propagation distance sparse estimation method and a detection system thereof. The method comprises the steps of acquiring the frequency-wavenumber curve of a target modal ultrasonic guided wave of a to-be-tested structure, taking unit impulse response signals at different propagation distances as atoms to construct an over-complete dictionary library, acquiring the unit pulse response signal of the to-be-tested structure, adopting the over-complete dictionary database as a signal base to establish the sparse representation model of the unit pulse response signal, and solving a sparse representation model to obtain the distance spectrum of the ultrasonic guided wave propagation. Compared with the prior art, the obtained distance spectrum result has higher range resolution, higher accuracy and better anti-interference effect.

Description

technical field [0001] The invention belongs to the field of ultrasonic technology, in particular to a method for sparsely estimating the propagation distance of an ultrasonic guided wave and a detection system thereof. Background technique [0002] Structural health monitoring technology is mainly aimed at major equipment and important economic infrastructure, and has important engineering significance and application value for improving its safety, reducing maintenance costs, and ensuring the safety of people's lives. Ultrasonic guided waves, such as Lamb waves in thin plate structures, are sensitive to both surface and internal damage of structures and can propagate over long distances, so they are an important tool in structural health monitoring. Structural health monitoring technology based on ultrasonic guided waves is an active structural health monitoring technology and one of the important development directions in the field of structural health monitoring. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/44G01N29/36G01N29/04
CPCG01N29/04G01N29/36G01N29/4472G01N2291/0289G01N2291/0427
Inventor 陈雪峰许才彬杨志勃乔百杰翟智田绍华陈强
Owner XI AN JIAOTONG UNIV
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