Accession Number : ADD011199

Title :   Low Drag Body Conformal Acoustic Array.

Descriptive Note : Patent,


Personal Author(s) : Schmidt,R L ; Sullivan,E J ; Myers,B J ; Liszka,E G

Report Date : 15 May 1984

Pagination or Media Count : 6

Abstract : A plurality of transducers, closely conforming to the surface of a low-drag nose, are baffle mounted in close pack configurations to eliminate grating lobes. The baffle assembly is mounted outside a pressure hull within a thin acoustically transparent fairing. A plurality of pressure compensators also attach outside the pressure hull. The cavity between pressure hull and fairing is filled with pressure compensating acoustic fluid. Larger portions of unused volume are first filled with a syntactic foam to minimize the amount of fluid required. The pressure compensators balance fluid pressure against external sea pressure to prevent fairing collapse. This array maximizes available nearby internal nose volume thus allowing beamforming electronics to be located within the pressure hull in close proximity to the array elements, connecting thereto via a plurality of short coaxial cables. The increased surface area of a conformal array permits use of a greater number of transducers resulting in wide aperture and a narrower beamwidth than is possible in a planar array.

Descriptors :   *Patents, *Acoustic arrays, Hydrodynamic configurations, Conformal structures, Surfaces, Laminar flow, Underwater sound equipment, Pressure hulls, Shape, Transducers, Torpedo components

Subject Categories : Acoustic Detection and Detectors
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE