Lamb波单一模态损伤散射波场的提取与成像研究

doi:10.16180/j.cnki.issn1007-7820.2019.07.005

Abstract

Abstract:

A filtering method of self-reference wavenumber interval was put forward in this paper. The proposed method was proven to be able to distinctly distinguish the different mode of Lamb wave and acquire a single Lamb wave mode damage scattering wave field without knowing the dispersion relation, which was of high practical value to detect the damage of plate-like structure. Based on the difference of wave-number values in different Lamb wave modes under the same frequency and the mapping relationships between wave direction and the 3 dimensional Fourier transform coefficient matrix, the corresponding arc filter window was designed in Matlab to filter the collected space-time wave field data. This article imaged the through-hole damage in aluminum plates by making use of the time-delay superposition imaging algorithm and rectangular array imaging data. The simulation and experiment results showed that the self-reference wavenumber interval filtering method effectively obtained the weak scattering wave field of double damage, and the position of damage reflection combining with the time-delay superposition imaging algorithm was located better. The imaging precision was improved with the increase of the number of elements, realizing the precise location of damage.

Key words: self reference wavenumber interval, Lamb waves, single mode, arc filter window, time delay superposition imaging algorithm, imaging precision.

CLC Number:

TN911.7

YANG Guoying. Study on the Extraction of Lamb Waves Single Modal Damage Scattering Wave Field and Imaging[J].Electronic Science and Technology, 2019, 32(7): 21-27.

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References 28

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参数名称	参数值
E/GPa	69
ν	0.33
ρ/kg·m^-3	2 700

阵元数目	损伤1/mm	损伤2/mm
49	(46.6,76.2)	(-37,65.8)
256	(47,75.9)	(-36.6,66.8)

Study on the Extraction of Lamb Waves Single Modal Damage Scattering Wave Field and Imaging

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