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Sound pressure level attenuation provided by thin rigid screens coupled to tall...
Tadeu, A.; António, J.; Mendes, P. Amado; Godinho, L.This paper computes the sound pressure attenuation provided by thin rigid screens placed on the walls of a tall building to protect the building from the direct sound incidence produced by sound pressure sources placed in its vicinity. The problem is formulated in the frequency domain via the Traction Boundary Element Method (TBEM), which overcomes the thin-body difficulty arising with the classical Boundary El...
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
Acoustic insulation of single panel walls provided by analytical expressions ve...
Tadeu, A.; António, J. M. P.Analytical solutions are presented for the calculation of the acoustic insulation provided by an infinite single panel wall when subjected to a spatially sinusoidal harmonic line load or a point pressure load (modelled as a superposition of spatially sinusoidal harmonic line loads). The method used does not entail limiting the thickness of the layer, as the Kirchhoff or Mindlin theory requires, and fully takes ...
Applications of the Green Functions in the Study of Acoustic Problems in Open a...
Tadeu, A.; António, J.; Godinho, L.This paper presents a set of analytical solutions (Green functions) for the steady state response of a homogenous acoustic three-dimensional space subjected to a point harmonic load or a spatially sinusoidal harmonic line load. The propagation medium is modelled with plane surfaces placed so as to reproduce spaces that vary from a simple half-space to a rectangular parallelepiped closed space. The final express...
Use of constant, linear and quadratic boundary elements in 3D wave diffraction ...
Tadeu, A.; António, J.The performance of the Boundary Element Method (BEM) depends on the size of the elements and the interpolation function used. However, improvements in accuracy and efficiency obtained with both expansion and grid refinement increases demand on the computational effort. This paper evaluates the performance of constant, linear and quadratic elements in the analysis of the three-dimensional scattering caused by a ...
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