A two-microphone method for the determination of the mode amplitude distribution in high-frequency ducted broadband sound fields
A two-microphone method for the determination of the mode amplitude distribution in high-frequency ducted broadband sound fields
This paper describes a measurement technique that allows the modal amplitude distribution to be determined in ducts with mean flow and reflections. The method is based only on measurements of the acoustic pressure two-point coherence at the duct wall. The technique is primarily applicable to broadband sound fields in the high frequency limit and whose mode amplitudes are mutually incoherent. The central assumption underlying the technique is that the relative mode amplitude distribution is independent of frequency. The two-microphone method proposed in this paper is also used to determine the transmitted sound power and far field pressure directivity.
ducts, measurement, noise
2019-2029
Joseph, P.F.
9c30491e-8464-4c9a-8723-2abc62bdf75d
October 2017
Joseph, P.F.
9c30491e-8464-4c9a-8723-2abc62bdf75d
Joseph, P.F.
(2017)
A two-microphone method for the determination of the mode amplitude distribution in high-frequency ducted broadband sound fields.
Journal of the Acoustical Society of America, 142 (4), .
(doi:10.1121/1.5004568).
Abstract
This paper describes a measurement technique that allows the modal amplitude distribution to be determined in ducts with mean flow and reflections. The method is based only on measurements of the acoustic pressure two-point coherence at the duct wall. The technique is primarily applicable to broadband sound fields in the high frequency limit and whose mode amplitudes are mutually incoherent. The central assumption underlying the technique is that the relative mode amplitude distribution is independent of frequency. The two-microphone method proposed in this paper is also used to determine the transmitted sound power and far field pressure directivity.
Text
JASA_paper_2017_revised_28july17
- Accepted Manuscript
More information
Accepted/In Press date: 10 September 2017
e-pub ahead of print date: 11 October 2017
Published date: October 2017
Keywords:
ducts, measurement, noise
Identifiers
Local EPrints ID: 416436
URI: http://eprints.soton.ac.uk/id/eprint/416436
ISSN: 0001-4966
PURE UUID: 3d5940b7-7d30-4e70-9b8f-af81c75855e4
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Date deposited: 15 Dec 2017 17:31
Last modified: 16 Mar 2024 05:51
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