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Experimental investigation of an inversion technique for the determination of broadband duct mode amplitudes by the use of near-field sensor arrays

Experimental investigation of an inversion technique for the determination of broadband duct mode amplitudes by the use of near-field sensor arrays
Experimental investigation of an inversion technique for the determination of broadband duct mode amplitudes by the use of near-field sensor arrays
This paper is an experimental investigation of an inverse technique for deducing the amplitudes of the modes radiated from a turbofan engine, including schemes for stablizing the solution. The detection of broadband modes generated by a laboratory-scaled fan inlet is performed using a near-field array of microphones arranged in a geodesic geometry. This array geometry is shown to allow a robust and accurate modal inversion. The sound power radiated from the fan inlet and the coherence function between different modal amplitudes are also presented. The knowledge of such modal content is useful in helping to characterize the source mechanisms of fan broadband noise generation, for determining the most appropriate mode distribution model for duct liner predictions, and for making sound power measurements of the radiated sound field.
0001-4966
848-859
Castres, Fabrice O.
a52a8185-7676-45aa-a7b4-212d35d42ff2
Joseph, Philip F.
9c30491e-8464-4c9a-8723-2abc62bdf75d
Castres, Fabrice O.
a52a8185-7676-45aa-a7b4-212d35d42ff2
Joseph, Philip F.
9c30491e-8464-4c9a-8723-2abc62bdf75d

Castres, Fabrice O. and Joseph, Philip F. (2007) Experimental investigation of an inversion technique for the determination of broadband duct mode amplitudes by the use of near-field sensor arrays. Journal of the Acoustical Society of America, 122 (2), 848-859. (doi:10.1121/1.2747166).

Record type: Article

Abstract

This paper is an experimental investigation of an inverse technique for deducing the amplitudes of the modes radiated from a turbofan engine, including schemes for stablizing the solution. The detection of broadband modes generated by a laboratory-scaled fan inlet is performed using a near-field array of microphones arranged in a geodesic geometry. This array geometry is shown to allow a robust and accurate modal inversion. The sound power radiated from the fan inlet and the coherence function between different modal amplitudes are also presented. The knowledge of such modal content is useful in helping to characterize the source mechanisms of fan broadband noise generation, for determining the most appropriate mode distribution model for duct liner predictions, and for making sound power measurements of the radiated sound field.

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Published date: August 2007

Identifiers

Local EPrints ID: 50465
URI: https://eprints.soton.ac.uk/id/eprint/50465
ISSN: 0001-4966
PURE UUID: c2629745-be89-49fa-b0da-f78308caa066

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Date deposited: 26 Feb 2008
Last modified: 13 Mar 2019 20:51

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