Artículos de revistas
Numerical Solution Of Acoustic Scattering By Finite Perforated Elastic Plates
Registro en:
Proceedings Of The Royal Society A- Mathematical Physical And Engineering Sciences. Royal Soc, v. 472, p. , 2016.
1364-5021
1471-2946
WOS:000377720900004
10.1098/rspa.2015.0767
Autor
Cavalieri
A. V. G.; Wolf
W. R.; Jaworski
J. W.
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) 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. 472 Fundacao de Amparo a Pesquisa do Estado de Sao Paulo, FAPESP [2013/03413-4, 2014/05671-3] Conselho Nacional de Desenvolvimento Cientifico e Tecnologico, CNPq [470695/2013-7] Science Without Borders program [A073/2013] Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)