Titre : |
Non-stationary elastic wavefields from an apodized normal transducer. Near-field asymptotics and numerics |
Année : |
2005 |
Type : |
article (revue avec comité de lecture) |
Auteurs : |
É. Bécache, A. Kiselev |
Résumé : |
We simulate non-stationary radiating near-field of a normal transducer acting at the surface of an isotropic homogeneous elastic half-space. The transducer is assumed large compared to the characteristic wavelength. Effects of non-constance of distribution of pressure over the aperture of the transducer on the wavefield are considered in detail. These are i) excitation of a plane S-wave, ii) anomalous polarization in the plane P-wave, and iii) suppression of edge waves by an apodization of the pressure distribution. Asymptotic formulas are tested against a numerical method based on new mixed finite elements. The agreement is found excellent within the bounds of the asymptotic theory. |
Thèmes : |
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Référence : |
Acta Acustica united with Acustica - vol. 91 (5) (pp 822-830 ) |