Scattering of flexural waves by an inhomogeneity in a thin plate

The characteristics of defects in plate-like structures can be extracted from the scattered flexural waves. The scattering of flexural waves is studied in this paper, using the integral equation method in the framework of the Mindlin plate theory. Using the Born approximation, the expression for the...

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Published inWave motion Vol. 75; pp. 50 - 61
Main Author Lu, Laiyu
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.12.2017
Elsevier BV
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Abstract The characteristics of defects in plate-like structures can be extracted from the scattered flexural waves. The scattering of flexural waves is studied in this paper, using the integral equation method in the framework of the Mindlin plate theory. Using the Born approximation, the expression for the flexural waves scattered by an inhomogeneity can be obtained, in which the Hankel function, rather than the exponential function, is involved in the integral kernel. Therefore, the far-field assumptions for the scatterer are not needed. The closed form for the singular integration of the Hankel function is solved, and hence, the complete scattered field near as well as inside the scatter can be calculated. The effective range of the far-field approximation is obtained by investigating the scattering amplitude of a circular inhomogeneity. In the case where the inhomogeneity diameter (2a) is less than one wavelength (λ), the far-field approximation achieves an accuracy of 1% at a distance greater than 2λ. If the inhomogeneity diameter is larger than λ, 1% accuracy will be achieved by the far-field approximation at a distance greater than 3ka. •The singular integration of Hankel function at R=0 is solved and the field inside the scatter can also be calculated.•Effective range of far-field approximation is investigated quantitatively.
AbstractList The characteristics of defects in plate-like structures can be extracted from the scattered flexural waves. The scattering of flexural waves is studied in this paper, using the integral equation method in the framework of the Mindlin plate theory. Using the Born approximation, the expression for the flexural waves scattered by an inhomogeneity can be obtained, in which the Hankel function, rather than the exponential function, is involved in the integral kernel. Therefore, the far-field assumptions for the scatterer are not needed. The closed form for the singular integration of the Hankel function is solved, and hence, the complete scattered field near as well as inside the scatter can be calculated. The effective range of the far-field approximation is obtained by investigating the scattering amplitude of a circular inhomogeneity. In the case where the inhomogeneity diameter (2α) is less than one wavelength (λ), the far-field approximation achieves an accuracy of 1% at a distance greater than 2λ. If the inhomogeneity diameter is larger than λ, 1% accuracy will be achieved by the far-field approximation at a distance greater than 3κα.
The characteristics of defects in plate-like structures can be extracted from the scattered flexural waves. The scattering of flexural waves is studied in this paper, using the integral equation method in the framework of the Mindlin plate theory. Using the Born approximation, the expression for the flexural waves scattered by an inhomogeneity can be obtained, in which the Hankel function, rather than the exponential function, is involved in the integral kernel. Therefore, the far-field assumptions for the scatterer are not needed. The closed form for the singular integration of the Hankel function is solved, and hence, the complete scattered field near as well as inside the scatter can be calculated. The effective range of the far-field approximation is obtained by investigating the scattering amplitude of a circular inhomogeneity. In the case where the inhomogeneity diameter (2a) is less than one wavelength (λ), the far-field approximation achieves an accuracy of 1% at a distance greater than 2λ. If the inhomogeneity diameter is larger than λ, 1% accuracy will be achieved by the far-field approximation at a distance greater than 3ka. •The singular integration of Hankel function at R=0 is solved and the field inside the scatter can also be calculated.•Effective range of far-field approximation is investigated quantitatively.
Author Lu, Laiyu
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CitedBy_id crossref_primary_10_1080_17455030_2022_2056257
crossref_primary_10_1016_j_wavemoti_2019_03_012
crossref_primary_10_1080_15376494_2023_2175395
Cites_doi 10.1121/1.1739482
10.2514/3.2716
10.1046/j.1365-246x.2001.01460.x
10.1016/j.wavemoti.2007.05.005
10.1016/S0165-2125(97)00016-4
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10.1016/j.jsv.2009.10.017
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Near-field effect
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Flexural wave
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Snippet The characteristics of defects in plate-like structures can be extracted from the scattered flexural waves. The scattering of flexural waves is studied in this...
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SubjectTerms Approximation
Born approximation
Exponential functions
Flexural wave
Hankel functions
Inhomogeneity
Integral equations
Integration
Mathematical analysis
Mindlin plate
Mindlin plates
Near-field effect
Plate theory
Plates (structural members)
Scattering
Scattering amplitude
Singular integration
Sound waves
Title Scattering of flexural waves by an inhomogeneity in a thin plate
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