Encontrados 14 documentos, a visualizar página 1 de 2
A three-dimensional acoustics model using the method of fundamental solutions
António, Julieta; Tadeu, António; Godinho, LuísThe method of fundamental solutions (MFS) is formulated in the frequency domain to model the sound wave propagation in three-dimensional (3D) enclosed acoustic spaces. In this model the solution is obtained by approximation, using a linear combination of fundamental solutions for the 3D Helmholtz equation. Those solutions relate to a set of virtual sources placed over a surface placed outside the domain in orde...
The simulation of 3D elastic scattering produced by thin rigid inclusions using...
Tadeu, António; Mendes, Paulo Amado; António, JulietaA mixed formulation that uses both the traction boundary element method (TBEM) and the boundary element method (BEM) is proposed to compute the three-dimensional (3D) propagation of elastic waves scattered by two-dimensional (2D) thin rigid inclusions. Although the conventional direct BEM has limitations when dealing with thin-body problems, this model overcomes that difficulty. It is formulated in the frequenc...
3D elastic wave propagation modelling in the presence of 2D fluid-filled thin i...
Tadeu, António; Mendes, Paulo Amado; António, JulietaIn this paper, the traction boundary element method (TBEM) and the boundary element method (BEM), formulated in the frequency domain, are combined so as to evaluate the 3D scattered wave field generated by 2D fluid-filled thin inclusions. This model overcomes the thin-body difficulty posed when the classical BEM is applied. The inclusion may exhibit arbitrary geometry and orientation, and may have null thicknes...
2.5D scattering of waves by rigid inclusions buried under a fluid channel via BEM
António, Julieta; Tadeu, António; Godinho, LuísA 2.5D Boundary Element Method (BEM) formulation, applied in the frequency domain, is developed to compute the scattering of waves by rigid inclusions buried in a semi-infinite solid under a fluid layer, when this system is excited by a spatially-sinusoidal harmonic load. ; http://www.sciencedirect.com/science/article/B6VKW-4G7G4FV-2/1/d8e95042c45a6fad34ce3dae672a00ff
The use of monopole and dipole sources in crosswell surveying
António, Julieta; Tadeu, AntónioThis paper implements a boundary element method (BEM) solution, formulated in the frequency domain, to simulate the crosswell S wave surveying technique. In this technique, one fluid-filled borehole hosts the source, and the other the receivers. The system is excited by a monopole or a dipole source placed near the first wall of the borehole wall, while the pressure field is recorded in the second borehole. The...
Acoustic insulation provided by circular and infinite plane walls
António, Julieta; Godinho, Luís; Tadeu, A.Antóniohttp://www.sciencedirect.com/science/article/B6WM3-49YHBW2-5/1/b85a7b9b647e715a1272ed5ba6b9be29
Sound propagation around rigid barriers laterally confined by tall buildings
Godinho, Luís; António, Julieta; Tadeu, AntónioThis paper focuses on the propagation of sound waves in the presence of acoustic barriers placed close to very tall buildings. The boundary element method (BEM) is used to model the acoustic barrier, while the presence of the tall buildings is taken into account by using the image source method. Different geometries are analyzed, representing the cases of a single building, two buildings forming a corner and th...
Influence of the cross-section geometry of a cylindrical solid submerged in an ...
Pereira, Andreia; Tadeu, António; António, JulietaThis paper studies wave propagation in the vicinity of a cylindrical solid formation submerged in an acoustic medium generated by point blast loads placed outside the inclusion. The full 3D solution is obtained first in the frequency domain as a discrete summation of responses for 2D problems defined by a spatial Fourier transform. Each 2D solution is computed using the Boundary Element Method, which makes use ...
3D scattering of waves by a cylindrical irregular cavity of infinite length in ...
Tadeu, António J. B.; António, Julieta M. P.; Kausel, Eduardohttp://www.sciencedirect.com/science/article/B6V29-459J6W9-3/1/3d445629b57a8b1547f3638751751d3d
Green's functions for 2.5D elastodynamic problems in a free solid layer formation
Tadeu, António; António, JulietaThis work presents analytical Green's functions for the steady state response of a homogeneous three-dimensional free solid layer formation (slab) subjected to a spatially sinusoidal harmonic line load, polarized along the horizontal, vertical and z directions. The equations presented here are not only themselves very interesting but are also useful for formulating three-dimensional elastodynamic problems in a ...
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