Accession Number : ADA294942

Title :   High-Power Terfenol-D Flextensional Transducer.

Descriptive Note : Final rept.,

Corporate Author : NAVAL UNDERSEA WARFARE CENTER NEWPORT DIV NEW LONDON CT NEW LONDON DETACHMENT

Personal Author(s) : Moffett, Mark B. ; Porzio, Raymond ; Bernier, Gerald L.

PDF Url : ADA294942

Report Date : 09 MAY 1995

Pagination or Media Count : 22

Abstract : A flextensional underwater acoustic projector, powered by Terfenol-D and operated at a depth of 400 ft (122 m), has been driven to a source level of 212 dB//uPa-m at the Naval Undersea Warfare Centers NUWC) Seneca Lake Test Facility. The flextensional shell was a modified Class IV shape having concave, rather than convex, radiating surfaces. The geometry of the shell was similar to one described by Merchant U. S. Patent No. 3,258,738, June 28,1966. The shell cross-section was circumscribed by a rectangular area 9.8 x 5.0 inches (250 mmx 126 mm), and the height between the end flanges was 5.8 inches (148 mm). At the resonance frequency of 930 Hz, the projector was omnidirectional, and so the radiated acoustic power was 14 kW. The ac efficiency was 52 percent, and the overall (ac + dc) efficiency was 45 percent. The mass of the transducer was 34 Ibm (15.4kg). With a mechanical quality factor, Q sub m, of 4.7, the projector figure-of- merit exceeded 200 W/kg-kHz-Q. The effective coupling factor, measured with the transducer in air, was 0.29. (MM)

Descriptors :   *UNDERWATER ACOUSTICS, *ELECTROACOUSTIC TRANSDUCERS, *SONAR PROJECTORS, HIGH POWER, UNDERSEA WARFARE, SHELLS(STRUCTURAL FORMS), RESONANT FREQUENCY, FLANGES, TRANSDUCERS, HYDROPHONES, ACOUSTIC VELOCITY, RADIATED NOISE, EQUIVALENT CIRCUITS, CONCAVE BODIES, HYDROSTATIC PRESSURE.

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE