Sound Scattering by a Flexible Plate Embedded on Free Surface

Author:

Avital Eldad J.1ORCID,Korakianitis Theodosios2,Miloh Touvia3

Affiliation:

1. School of Engineering and Materials Science, Queen Mary University of London, London E1 4NS, UK

2. Parks College of Engineering, Aviation and Technology, Saint Louis University, St. Louis, MO 63103, USA

3. Faculty of Engineering, Tel-Aviv University, 69978 Tel Aviv, Israel

Abstract

Sound wave scattering by a flexible plate embedded on water surface is considered. Linear acoustics and plate elasticity are assumed. The aim is to assess the effect of the plate’s flexibility on sound scattering and the potential in using that flexibility for this purpose. A combined sound-structure solution is used, which is based on a Fourier transform of the sound field and a finite-difference numerical-solution of the plate’s dynamics. The solution is implemented for a circular plate subject to a perpendicular incoming monochromatic sound wave. A very good agreement is achieved with a finite-difference solution of the sound field. It is shown that the flexibility of the plate dampens its scattered sound wave regardless of the type of the plate’s edge support. A hole in the plate is shown to further scatter the sound wave to form maxima in the near sound field. It is suggested that applying an external oscillatory pressure on the plate can reduce significantly and even eliminate its scattered wave, thus making the plate close to acoustically invisible. A uniformly distributed external pressure is found capable of achieving that aim as long as the plate is free edged or is not highly acoustically noncompact.

Publisher

Hindawi Limited

Subject

Mechanics of Materials,Acoustics and Ultrasonics,Building and Construction

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