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 in | Wave motion Vol. 75; pp. 50 - 61 |
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Format | Journal Article |
Language | English |
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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. |
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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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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 10.1121/1.3277217 10.1190/1.1440527 10.1006/jsvi.1995.0129 10.1016/j.jsv.2004.02.023 10.1121/1.3533742 10.1121/1.3533741 10.1016/j.jsv.2009.10.017 10.1016/j.jsv.2012.06.002 10.1111/j.1365-246X.2008.03787.x |
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Keywords | 99-00 Near-field effect 00-01 Flexural wave Scattering Singular integration Mindlin plate |
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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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