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Broadband acoustic scattering with modern aesthetics from random 3D terrain surfaces generated using the Fourier Synthesis algorithm
Citation
Henham, W and Holloway, D and Panton, L, Broadband acoustic scattering with modern aesthetics from random 3D terrain surfaces generated using the Fourier Synthesis algorithm, Proceedings of Acoustics 2016: The Second Australasian Acoustical Societies Conference, 9-11 November 2016, Brisbane, Australia, pp. 203-212. ISBN 9780909882266 (2016) [Refereed Conference Paper]
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Official URL: http://www.acoustics2016.com.au/
Abstract
Acoustic diffusers are designed to scatter sound to create diffuse sound fields, ideally providing a uniform acoustic
experience over a broad frequency range within a listening space. Standard diffuser designs, such as Schroeder diffusers,
while effective, may be considered by some to have a design aesthetic that does not conform to particular architectural
styles. In this paper the Fourier Synthesis algorithm for procedural 3D random terrain generation is investigated as an
alternative for diffuser surface geometry, providing scattering in two dimensions, and scope to vary the bandwidth
through a surface smoothness parameter. The scattering properties of a prototype diffuser are investigated
experimentally and through numerical modelling using a boundary element method (BEM) program called FastBEM.
Good agreement between these is achieved, providing solid validation of the numerical model from which the
performance of the diffuser can be assessed. The scattering properties are quantified using polar plots, 3D plots, and the
diffusion coefficient. As expected, the Fourier Synthesis diffuser provides good diffusion when the wavelength of the
incident sound is comparable to the wavelength of periodicity of the diffuser geometry. A preliminary investigation into
the performance of the diffuser for various levels of surface roughness is made, showing that high diffusion can be
extended to higher frequencies by increasing the surface roughness of the diffuser.
Item Details
| Item Type: | Refereed Conference Paper |
|---|---|
| Keywords: | acoustic diffuser, Fourier synthesis, boundary element method, random terrain |
| Research Division: | Built Environment and Design |
| Research Group: | Architecture |
| Research Field: | Architectural Science and Technology (incl. Acoustics, Lighting, Structure and Ecologically Sustainable Design) |
| Objective Division: | Expanding Knowledge |
| Objective Group: | Expanding Knowledge |
| Objective Field: | Expanding Knowledge in Engineering |
| Author: | Henham, W (Mr William Henham) |
| Author: | Holloway, D (Dr Damien Holloway) |
| Author: | Panton, L (Ms Lilyan Panton) |
| ID Code: | 115009 |
| Year Published: | 2016 |
| Deposited By: | Engineering |
| Deposited On: | 2017-03-06 |
| Last Modified: | 2017-07-17 |
| Downloads: | 13 View Download Statistics |
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