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Exact modeling of targets in littoral environments

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00014-10-C-0440
Agency Tracking Number: N09A-026-0241
Amount: $1,335,280.00
Phase: Phase II
Program: STTR
Solicitation Topic Code: N09-T026
Solicitation Number: 2009.1
Solicitation Year: 2009
Award Year: 2010
Award Start Date (Proposal Award Date): 2010-09-21
Award End Date (Contract End Date): 2013-02-09
Small Business Information
3366 N. Torrey Pines Court Suite 310
La Jolla, CA 92037
United States
DUNS: 000000000
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Ahmad Abawi
 Chief Scientist
 (858) 457-0800
Business Contact
 Otis Benton
Title: Controller
Phone: (858) 457-0800
Research Institution
 University of California, San Diego
 Dr. Petr Krysl
9500 Gilman Dr.
La Jolla, CA 92093
United States

 (858) 822-4787
 Nonprofit College or University

The US Navy needs the capability to model acoustic propagation in complex ocean environments containing natural or man-made objects. Such accurate modeling requires the solution of the wave equation in the ocean containing scatterers. In the absence of the scatterer, the oceanic waveguide can be assumed to be axially symmetric. This allows certain types of physically valid approximations to be made, which are 2D in nature, but can accurately compute the acoustic field in a 3D ocean. The presence of the scatterer breaks this symmetry and forces one to model the ocean as fully 3D. Due the large size of the computational domain, the solution of the wave equation in an oceanic waveguide in the presence of scatterers is a daunting numerical task. In Phase I of this STTR we developed finite element models in the frequency and time domains to compute the acoustic field in a 2D, elastic, range-dependent waveguide in the presence of an elastic object. The objective of this Phase II effort is to develop the numerical capability to accurately solve the wave equation in a range-dependent elastic waveguide in the presence of a general, 3D elastic target to ranges of at least 10,000 acoustic wavelengths. To cope with the numerical complexities in 3D, we plan to accomplish this objective by developing numerical tools that implement a hybrid model composed of finite element and propagation models.

* Information listed above is at the time of submission. *

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