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Predictions of the Acoustic Nearfield on a Carrier Deck

Award Information

Department of Defense
Award ID:
Program Year/Program:
2010 / SBIR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
NAVY 10-128
Solicitation Number:
Small Business Information
Hersh Acoustical Engineering, Inc.
22305 Cairnloch Street Calabasas, CA 91302 5875
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Woman-Owned: Yes
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2010
Title: Predictions of the Acoustic Nearfield on a Carrier Deck
Agency / Branch: DOD / NAVY
Contract: N68335-10-C-0524
Award Amount: $79,995.00


On a carrier deck, navy personnel operate in close proximity to high-speed jets. They are, therefore, exposed to high intensity jet noise resulting in possible severe loss of hearing. The objective of the project is to develop jet noise prediction capability for quantitative assessment of the acoustic environment on an active carrier deck. Such assessment would allow the identification of noise hot spots to be avoided. Jet noise consists of three principal components; the fine-scale turbulence noise, the large turbulence structures noise and the broadband shock-cell noise. For military jets, the large structures noise is most intense and dominant. It is the focus of this project. Specifically, the aim is to develop a physics-based prediction method. It is known that large turbulence structures are spatially and temporally coherent. The noise is highly direction. The mechanism is Mach wave radiation. All these important characteristics will be incorporated into the model prediction theory. The theory will follow the highly successful Tam and Auriault (1999) fine-scale turbulence noise theory with the characteristics of fine scale turbulence replaced by those of the large turbulence structures. The Green's function method will be used to propagate noise from source to the near and far field.

Principal Investigator:

Alan Hersh
Vice President

Business Contact:

Alan Hersh
Vice President
Small Business Information at Submission:

Hersh Acoustical Engineering, Inc.
22305 Cairnloch Street Calabasas, CA 91305

EIN/Tax ID: 953718491
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No