Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
3D sound scattering by rigid barriers in the vicinity of tall buildings
The boundary element method (BEM) is used to evaluate the acoustic scattering of a three-dimensional (3D) sound source by an infinitely Iong rigid barrier in the vicinity of tall buildings. The barier 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 series of 2D problems with different spatial wavenumbers, kz. The wavenumber transform in discrete form is obtained considering an infinite number of virtual point sources equally spaced along the z axis. Complex frequencies are used to minimize the influence of these neighboring fictitious sources. Different geometric models, with barriers of varying sizes, are used. The reduction of sound pressure in the vicinity of the buildings is evaluated and the creation of shadow zones by the barriers analyzed and compared with results provided by a simplified method.
3D sound scattering by rigid barriers in the vicinity of tall buildings
The boundary element method (BEM) is used to evaluate the acoustic scattering of a three-dimensional (3D) sound source by an infinitely Iong rigid barrier in the vicinity of tall buildings. The barier 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 series of 2D problems with different spatial wavenumbers, kz. The wavenumber transform in discrete form is obtained considering an infinite number of virtual point sources equally spaced along the z axis. Complex frequencies are used to minimize the influence of these neighboring fictitious sources. Different geometric models, with barriers of varying sizes, are used. The reduction of sound pressure in the vicinity of the buildings is evaluated and the creation of shadow zones by the barriers analyzed and compared with results provided by a simplified method.
3D sound scattering by rigid barriers in the vicinity of tall buildings
Die dreidimensionale Schallstreuung durch starre Barrieren in der Umgebung von Hochhäusern
Godinho, L. (Autor:in) / Antonio, J. (Autor:in) / Tadeu, A. (Autor:in)
Applied Acoustics ; 62 ; 1229-1248
2001
20 Seiten, 20 Quellen
Aufsatz (Zeitschrift)
Englisch
Wolkenkratzer , Schallbarriere , Schallstreuung , dreidimensionale Darstellung , Schallquelle , Rechenmodell , numerische Simulation , Rand-Elemente-Methode , Frequenzbereich , Fourier-Transformation , inverse Funktion , Lösung (Mathematik) , Wellenzahl , Geometrie (Mathematik) , Methodenvergleich , Schalldruck , Schalldämpfung , Schatten
Sound propagation around rigid barriers laterally confined by tall buildings
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