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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Numerical solution of acoustic scattering by finite perforated elastic plates

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Author(s):
Cavalieri, A. V. G. [1] ; Wolf, W. R. [2] ; Jaworski, J. W. [3]
Total Authors: 3
Affiliation:
[1] Inst Tecnol Aeronaut, Div Engn Aeronaut, BR-12228900 Sao Paulo - Brazil
[2] Univ Estadual Campinas, Fac Engn Mecan, BR-13083860 Sao Paulo - Brazil
[3] Lehigh Univ, Dept Mech Engn & Mech, Bethlehem, PA 18015 - USA
Total Affiliations: 3
Document type: Journal article
Source: PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SC; v. 472, n. 2188 APR 1 2016.
Web of Science Citations: 8
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. (AU)

FAPESP's process: 13/03413-4 - Investigation of noise generation and propagation by aerodynamic configurations using computational aeroacoustics
Grantee:William Roberto Wolf
Support Opportunities: Research Grants - Young Investigators Grants
FAPESP's process: 14/05671-3 - 20th AIAA/CEAS Aeroacoustics Conference
Grantee:André Valdetaro Gomes Cavalieri
Support Opportunities: Research Grants - Meeting - Abroad