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Noise sources for duct acoustics simulations: broadband noise and tones

Noise sources for duct acoustics simulations: broadband noise and tones
Noise sources for duct acoustics simulations: broadband noise and tones
While simulating acoustic tones propagating in ducts or waveguides is relatively well established, broadband noise is comprised of a wide range of frequencies and at each frequency the acoustic energy is generally distributed over all the cut-on modes of the duct. Simulating the propagation and absorption of broadband noise is further complicated by the random nature of the sound field. This paper presents a computational method to generate truly broadband, multi-mode noise in a time-domain simulation. This method is equally applicable to the generation of deterministic tones. For broadband noise, we devise a stochastic source that is tailored to radiate a sound field characterized by the cross-correlation between mode amplitudes. This stochastic source allows to compute in a single time-domain simulation the complete spectrum of the broadband multi-mode sound field. Unlike other methods proposed for predicting broadband noise, there is no need to perform several simulations for different realizations. Results are presented for broadband noise alone, as well as for a combination of tones and broadband noise.
0001-1452
1994-2006
Gabard, G.
bfd82aee-20f2-4e2c-ad92-087dc8ff6ce7
Gabard, G.
bfd82aee-20f2-4e2c-ad92-087dc8ff6ce7

Gabard, G. (2014) Noise sources for duct acoustics simulations: broadband noise and tones. AIAA Journal, 52 (9), 1994-2006. (doi:10.2514/1.J052739).

Record type: Article

Abstract

While simulating acoustic tones propagating in ducts or waveguides is relatively well established, broadband noise is comprised of a wide range of frequencies and at each frequency the acoustic energy is generally distributed over all the cut-on modes of the duct. Simulating the propagation and absorption of broadband noise is further complicated by the random nature of the sound field. This paper presents a computational method to generate truly broadband, multi-mode noise in a time-domain simulation. This method is equally applicable to the generation of deterministic tones. For broadband noise, we devise a stochastic source that is tailored to radiate a sound field characterized by the cross-correlation between mode amplitudes. This stochastic source allows to compute in a single time-domain simulation the complete spectrum of the broadband multi-mode sound field. Unlike other methods proposed for predicting broadband noise, there is no need to perform several simulations for different realizations. Results are presented for broadband noise alone, as well as for a combination of tones and broadband noise.

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Accepted/In Press date: December 2013
Published date: September 2014
Organisations: Acoustics Group

Identifiers

Local EPrints ID: 364741
URI: http://eprints.soton.ac.uk/id/eprint/364741
ISSN: 0001-1452
PURE UUID: 30574b8a-dcb6-47d7-a7a4-dfeac1773f8a

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Date deposited: 12 May 2014 10:48
Last modified: 28 Oct 2019 20:58

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Contributors

Author: G. Gabard

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