Predictions of the Acoustic Nearfield on a Carrier Deck

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$79,680.00
Award Year:
2010
Program:
SBIR
Phase:
Phase I
Contract:
N68335-10-C-0525
Award Id:
98624
Agency Tracking Number:
N102-128-1139
Solicitation Year:
n/a
Solicitation Topic Code:
NAVY 10-128
Solicitation Number:
n/a
Small Business Information
ATA Engineering, Inc (Currently ATA ENGINEERING, INC.)
11995 El Camino Real, Suite 200, San Diego, CA, 92130
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
133709001
Principal Investigator:
Michael Yang
Senior Project Engineer
(858) 480-2040
mike.yang@ata-e.com
Business Contact:
Ronan Cunningham
Director, Business Develo
(858) 480-2015
ronan.cunningham@ata-e.com
Research Institution:
n/a
Abstract
The noise levels caused by the jet plumes of modern high-performance military jets are a health hazard to nearby service personnel as well as a significant fatigue load. A methodology is proposed to derive source models for supersonic jet engines which can be used to predict propagation into the near- and far-field. Proprietary experimental databases will be used to express the source models as partial fields and wavepackets. Partial fields are calculated in a way that represents as much of the total energy in as few basis functions as possible. The underlying physics are not considered, but this approach is very robust since the capture of the total energy is the goal. Wavepackets have a higher physical relevance and if a deep understanding of the physics is available, predictions of jet noise sources may be made for configurations that have not been explicitly tested. These models will be integrated into a leading commercial vibroacoustic code and the sound will be propagated using the Boundary Element Method (BEM), which can model the effects of reflecting surfaces such as the aircraft carrier deck or jet blast deflectors without the meshing difficulties or extremely high computational expense of the finite element method.

* information listed above is at the time of submission.

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