Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/327493
Type: Artigo
Title: Numerical Solution Of Acoustic Scattering By Finite Perforated Elastic Plates
Author: Cavalieri
A. V. G.; Wolf
W. R.; Jaworski
J. W.
Abstract: We present a numerical method to compute the acoustic field scattered by finite perforated elastic plates. A boundary element method is developed to solve the Helmholtz equation subjected to boundary conditions related to the plate vibration. These boundary conditions are recast in terms of the vibration modes of the plate and its porosity, which enables a direct solution procedure. A parametric study is performed for a two-dimensional problem whereby a cantilevered perforated elastic plate scatters sound from a point quadrupole near the free edge. Both elasticity and porosity tend to diminish the scattered sound, in agreement with previous work considering semi-infinite plates. Finite elastic plates are shown to reduce acoustic scattering when excited at high Helmholtz numbers k(0) based on the plate length. However, at low k(0), finite elastic plates produce only modest reductions or, in cases related to structural resonance, an increase to the scattered sound level relative to the rigid case. Porosity, on the other hand, is shown to be more effective in reducing the radiated sound for low k(0). The combined beneficial effects of elasticity and porosity are shown to be effective in reducing the scattered sound for a broader range of k(0) for perforated elastic plates.
Subject: Acoustic Scattering
Fluid-structure Interaction
Aeroacoustics
Editor: Royal Soc
London
Rights: fechado
Identifier DOI: 10.1098/rspa.2015.0767
Address: http://rspa.royalsocietypublishing.org/content/472/2188/20150767
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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