WIT Press


The Scattering Of 3D Sound Sources By Rigid Barriers In The Vicinity Of Tall Buildings

Price

Free (open access)

Paper DOI

10.2495/BE000501

Volume

26

Pages

10

Published

2000

Size

1,170 kb

Author(s)

L. Godinho, J. Antonio & A. Tadeu

Abstract

The scattering of 3D sound sources by rigid barriers in the vicinity of tall buildings L. Godinho, J. Antonio & A. Tadeu Department of Civil Engineering University of Coimbra, Portugal Abstract The Boundary Element Method (BEM) is used to evaluate the acoustic scattering of a three-dimensional sound source by an infinitely long rigid barrier in the vicinity of a tall building. The barrier is assumed to be non-absorbing and the buildings are modeled as an infinite barrier. The calculations are performed in the frequency domain and time signatures are obtained by means of Inverse Fourier Transforms. The 3D solution is obtained by means of Fourier Transform in the direction in which the geometry does not vary. This requires solving a sequence of 2D problems with different spatial wavenumbers, k^. The wavenumber transform in discrete form is obtained by considering an infinite number of virtual point sources equally spaced along the z axis. Complex frequencies are used

Keywords