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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
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
0001-4966
2019-2029
Joseph, P.F.
9c30491e-8464-4c9a-8723-2abc62bdf75d
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), 2019-2029. (doi:10.1121/1.5004568).

Record type: Article

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.

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JASA_paper_2017_revised_28july17 - Accepted Manuscript
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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: 07 Oct 2020 06:17

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