DEDICATED 3-D ACOUSTIC MULTILAYER RESPONSE MODEL

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$130,000.00
Award Year:
1986
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
2058
Agency Tracking Number:
2058
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
3344 N Torrey Pines Ct - Ste 3, La Jolla, CA, 92037
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Robert S Dunham
(619) 455-6350
Business Contact:
() -
Research Institute:
n/a
Abstract
THE SAFETY OF SUBMARINES REQUIRES THAT THEY BE DESIGNED ACOUSTICALLY QUIET TO AVOID DETECTION. ONE METHOD TO REDUCE ACOUSTIC EMISSION IS TO SURROUND THE HULL WITH A VISCOELASTIC LAYER. IN ORDER TO ACCESS THE EFFECTIVENESS OF THESE VISCOELASTIC LAYERS, IT IS NECESSARYTO DETERMINE THE THREE-DIMENSIONAL (3-D) SURFACE COMPLEX IMPEDANCE AND ACOUSTIC LOSS AS A FUNCTION OF FREQUENCY FOR A STEADY STATE HARMONIC INPUT. THIS PROJECT WILL PROVIDE FOR THE ACCURATE ASSESSMENT OF THE EFFECTIVENESS OF THESE VISCOELASTIC LAYERS BY DEVELOPING AN EFFICIENT, MODULAR, USER-FRIENDLY, DEDICATED 3-D FINITE ELEMENT CODE THAT IS CAPABLE OF DETERMINING THE COMPLEX SURFACE IMPEDENCE AS A FUNCTION OF THE STEADY STATE DRIVING FREQUENCY AND ACCURATE MODELING TECHNIQUES FOR THESE UNIQUE GEOMETRIES.

* information listed above is at the time of submission.

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