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Low-frequency acoustic shielding by the Silent Aircraft airframe

Low-frequency acoustic shielding by the Silent Aircraft airframe
Low-frequency acoustic shielding by the Silent Aircraft airframe
The Silent Aircraft airframe has a flying-wing design with a large wing planform and a propulsion system
embedded in the rear of the airframe with intake on the upper surface of the wing. In the present paper, boundaryelement
calculations are presented to evaluate acoustic shielding at low frequencies. Besides the three-dimensional
geometry of the Silent Aircraft airframe, a few two-dimensional problems are considered that provide some physical
insight into the shielding calculations. Mean-flow refraction effects due to forward-flight motion are accounted for by
a simple time transformation that decouples the mean-flow and acoustic-field calculations. It is shown that a
significant amount of shielding can be obtained in the shadow region where there is no direct line of sight between the
source and observer.
0001-1452
358-365
Agarwal, Anurag
f63a9325-bd24-4341-8727-42a87cc5a163
Dowling, Ann P.
6d0a4985-4dcf-40bc-a001-b9febb56f7f5
Agarwal, Anurag
f63a9325-bd24-4341-8727-42a87cc5a163
Dowling, Ann P.
6d0a4985-4dcf-40bc-a001-b9febb56f7f5

Agarwal, Anurag and Dowling, Ann P. (2007) Low-frequency acoustic shielding by the Silent Aircraft airframe. AIAA Journal, 45 (2), 358-365. (doi:10.2514/1.19351).

Record type: Article

Abstract

The Silent Aircraft airframe has a flying-wing design with a large wing planform and a propulsion system
embedded in the rear of the airframe with intake on the upper surface of the wing. In the present paper, boundaryelement
calculations are presented to evaluate acoustic shielding at low frequencies. Besides the three-dimensional
geometry of the Silent Aircraft airframe, a few two-dimensional problems are considered that provide some physical
insight into the shielding calculations. Mean-flow refraction effects due to forward-flight motion are accounted for by
a simple time transformation that decouples the mean-flow and acoustic-field calculations. It is shown that a
significant amount of shielding can be obtained in the shadow region where there is no direct line of sight between the
source and observer.

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Published date: February 2007

Identifiers

Local EPrints ID: 49081
URI: https://eprints.soton.ac.uk/id/eprint/49081
ISSN: 0001-1452
PURE UUID: 81e77b5d-8852-42ae-aa63-45544cb45adf

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Date deposited: 23 Oct 2007
Last modified: 13 Mar 2019 20:55

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Contributors

Author: Anurag Agarwal
Author: Ann P. Dowling

University divisions

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