Accession Number : ADA334148

Title :   Frequency-Agile High-Power-Density Transducers: Draft/Final Technical Report.

Descriptive Note : Final rept. 2 Jul 97-2 Jan 98,

Corporate Author : ACTIVE SIGNAL TECHNOLOGIES INC COCKEYSVILLE MD

Personal Author(s) : Bridger, Keith ; Sewell, John M. ; Kuhn, Philip M. ; Passaro, Edward J. ; Cho, Yong S.

PDF Url : ADA334148

Report Date : 05 JAN 1998

Pagination or Media Count : 43

Abstract : This report documents a design study aimed at producing broader bandwidth, high- power transducers for Navy applications in littoral waters. The top-to-bottom study included both ceramic driver processing and the transducer design itself. Active Signal Technologies and Alfred University investigated a novel processing method involving coating the ceramic particles prior to densification and it substantially increased the room-temperature electrically-induced strains available from the ceramic without significantly increasing dielectric loss. This strain increase could translate to a >3-dB increase in power density for the broadband transducers. Active Signal investigated a range of transducer classes including Class IV and VII Flextensional, Tonpilz, Moment Bender, Flexural Disk, and Split Cylinder. Substituting graphite-epoxy for aluminum in the radiating surface produced ^ 30% increases in bandwidth in most of the classes. With this and other parametric adjustments, designs that met feasibility criteria (power, efficiency, depth dependence, etc.) but had fractional bandwidths > 80% were prepared. The recommended design was a graphite-epoxy Class-TV Flextensional.

Descriptors :   *BROADBAND TRANSDUCERS, HIGH POWER, RADIATION, PARAMETRIC ANALYSIS, DIELECTRICS, CERAMIC COATINGS, PARTICLES, CYLINDRICAL BODIES, ALUMINUM, HIGH DENSITY, POWER EQUIPMENT, LITTORAL ZONES, FLEXURAL PROPERTIES, MAGNESIUM ALLOYS, LEAD(METAL).

Subject Categories : Electrical and Electronic Equipment
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE