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In-flight experiments on the active control of propeller-induced cabin noise

In-flight experiments on the active control of propeller-induced cabin noise
In-flight experiments on the active control of propeller-induced cabin noise

Results are presented of a series of in-flight experiments on the active contrl of propeller-induced passenger cabin noise in a B.Ae. 748 aircraft. Twenty-six configurations of up to 16 loudspeakers and 32 microphones were investigated at the first three harmonics of the blade passage frequency. Two loudspeaker distributions, which were either evenly distributed or partly concentrated in the plane of the propellers, gave similar reductions in the sum of the squares of the measured pressures at the fundamental blade passage frequency (88 Hz) of about 13 dB. Concentrating the loudspeakers near the propeller plane increased the reductions in the second and third harmonics (176 Hz and 264 Hz) from about 9 dB and 6 dB respectively for the equally distributed system, to about 12 dB for both harmonics. Subjective reductions in noise level with all three harmonics being simultaneously controlled were pronounced, with reductions of over 7 dB(A) being recorded at some seat locations. Also reported are additional experiments, with a local (two-loudspeaker, two-microphone) control system used for a single seat, and with the 16 loudspeaker, 32 microphone control system used to control the noise inside the cabin when the engines were run-up on the ground.

0022-460X
219-238
Elliot, S. J.
66539e2e-51e7-4796-86ae-452db98b3ded
Nelson, P. A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Stothers, I. M.
4e90ebe7-f459-435b-aa0b-7a349faad180
Boucher, C. C.
d1f82cdc-0534-4471-befc-7f6796f4278a
Elliot, S. J.
66539e2e-51e7-4796-86ae-452db98b3ded
Nelson, P. A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Stothers, I. M.
4e90ebe7-f459-435b-aa0b-7a349faad180
Boucher, C. C.
d1f82cdc-0534-4471-befc-7f6796f4278a

Elliot, S. J., Nelson, P. A., Stothers, I. M. and Boucher, C. C. (1990) In-flight experiments on the active control of propeller-induced cabin noise. Journal of Sound and Vibration, 140 (2), 219-238. (doi:10.1016/0022-460X(90)90525-5).

Record type: Article

Abstract

Results are presented of a series of in-flight experiments on the active contrl of propeller-induced passenger cabin noise in a B.Ae. 748 aircraft. Twenty-six configurations of up to 16 loudspeakers and 32 microphones were investigated at the first three harmonics of the blade passage frequency. Two loudspeaker distributions, which were either evenly distributed or partly concentrated in the plane of the propellers, gave similar reductions in the sum of the squares of the measured pressures at the fundamental blade passage frequency (88 Hz) of about 13 dB. Concentrating the loudspeakers near the propeller plane increased the reductions in the second and third harmonics (176 Hz and 264 Hz) from about 9 dB and 6 dB respectively for the equally distributed system, to about 12 dB for both harmonics. Subjective reductions in noise level with all three harmonics being simultaneously controlled were pronounced, with reductions of over 7 dB(A) being recorded at some seat locations. Also reported are additional experiments, with a local (two-loudspeaker, two-microphone) control system used for a single seat, and with the 16 loudspeaker, 32 microphone control system used to control the noise inside the cabin when the engines were run-up on the ground.

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More information

Published date: 22 July 1990
Additional Information: Funding Information: Fundamental research at the Institute of Sound and Vibration Research into the active control of enclosed sound fields has been supported by grants from the U.K. Department

Identifiers

Local EPrints ID: 468810
URI: http://eprints.soton.ac.uk/id/eprint/468810
ISSN: 0022-460X
PURE UUID: ca52a950-1225-4c54-a561-3cf9a47e279e
ORCID for P. A. Nelson: ORCID iD orcid.org/0000-0002-9563-3235

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Date deposited: 25 Aug 2022 17:23
Last modified: 18 Mar 2024 02:31

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Contributors

Author: S. J. Elliot
Author: P. A. Nelson ORCID iD
Author: I. M. Stothers
Author: C. C. Boucher

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