Near‐field acoustic scattering from rough surfaces

1990 ◽  
Vol 88 (S1) ◽  
pp. S86-S86
Author(s):  
Jerald W. Caruthers ◽  
Richard S. Keiffer
Keyword(s):  
Rough Surfaces ◽  
Near Field ◽  
Acoustic Scattering

Acoustic Scattering of 3D Complex Systems Having Random Rough Surfaces by Scalar Integral Equations

2016 ◽  
Vol 41 (3) ◽  
pp. 461-472 ◽  
Author(s):  
Juan Antonio Guel-Tapia ◽  
Francisco Villa-Villa ◽  
Alberto Mendoza-Suarez ◽  
Hector Pérez-Aguilar
Keyword(s):  
Rough Surfaces ◽  
Near Field ◽  
Acoustic Scattering ◽  
Parametric Representation ◽  
Surface Integral ◽  
Exterior Problems ◽  
Random Rough Surfaces ◽  
Cylindrical Cavities ◽  
Scalar Integral ◽  
Good Agreement

Abstract We propose a numerical surface integral method to study complex acoustic systems, for interior and exterior problems. The method is based on a parametric representation in terms of the arc’s lengths in curvilinear orthogonal coordinates. With this method, any geometry that involves quadric or higher order surfaces, irregular objects or even randomly rough surfaces can be considered. In order to validate the method, the modes in cubic, spherical and cylindrical cavities are calculated and compared to analytical results, which produced very good agreement. In addition, as examples, we calculated the scattering in the far field and the near field by an acoustic sphere and a cylindrical structure with a rough cross-section.

scholarly journals Far-field and near-field directionality in acoustic scattering

2020 ◽  
Vol 22 (8) ◽  
pp. 083016 ◽  
Author(s):  
Lei Wei ◽  
Francisco J Rodríguez-Fortuño
Keyword(s):  
Near Field ◽  
Acoustic Scattering ◽  
Far Field

Near-field Imaging Point-like Scatterers and Extended Elastic Solid in a Fluid

2016 ◽  
Vol 19 (5) ◽  
pp. 1317-1342
Author(s):  
Tao Yin ◽  
Guanghui Hu ◽  
Liwei Xu
Keyword(s):  
Near Field ◽  
Scattering Problem ◽  
Acoustic Scattering ◽  
Elastic Solid ◽  
Field Measurements ◽  
Factorization Method ◽  
Music Algorithm ◽  
Incident Wavelength ◽  
Imaging Point ◽  
Necessary And Sufficient

AbstractConsider the time-harmonic acoustic scattering from an extended elastic body surrounded by a finite number of point-like obstacles in a fluid. We assume point source waves are emitted from arrayed transducers and the signals of scattered near-field data are recorded by receivers not far away from the scatterers (compared to the incident wavelength). The forward scattering can be modeled as an interaction problem between acoustic and elastic waves together with a multiple scattering problem between the extend solid and point scatterers. We prove a necessary and sufficient condition that can be used simultaneously to recover the shape of the extended elastic solid and to locate the positions of point scatterers. The essential ingredient in our analysis is the outgoing-to-incoming (OtI) operator applied to the resulting near-field response matrix (or operator). In the first part, we justify the MUSIC algorithm for locating point scatterers from near-field measurements. In the second part, we apply the factorization method, the continuous analogue of MUSIC, to the two-scale scattering problem for determining both extended and point scatterers. Numerical examples in 2D are demonstrated to show the validity and accuracy of our inversion algorithms.

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