WATER DEPTH AND DRIVE VOLTAGE DEPENDENCE OF THE ACOUSTIC PARAMETERS OF A BARREL-STAVE FLEXTENSIONAL PROJECTOR

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Authors
  1. Jones, D.F.
  2. Moffett, M.B.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
A low-frequency barrel-stave flextensional projector for sonar and general underwater acoustics applications has been built at the Defence Research Establishment Atlantic in Dartmouth, Nova Scotia. The projector was calibrated at the Seneca Lake sonar test facility at Dresden, NY, as a joint research venture with the Naval Undersea Warfare Center, New London, Connecticut. The transmitting voltage response (TVR), mechanical quality factor (Qm), electrical admittance, and electroacoustic efficiency (Hea) were measured for driving voltages up to 5.0 kVrms at four depths: 30, 61, 91, and 123 m. At 5.0 kVrms , the resonance frequency (fo) increased from 780 Hz to 840 Hz, Qm decreased from 4.4 to 3.3, and Hea decreased from 87% to 71%, as the depth was increased from 30 m to 123 m. The change in each acoustic parameter, averaged over the four depths of interest, was -10 Hz/kVrms for fo, +0.4 dB/kVrms for the TVR at resonance, and 0.1/kVrms for Qm, as the driving voltage was increased from 0.1 to 5.0 kVrms. The dependence of the parameters on depth and driving voltage are discussed in terms of the interactions between the rubber boot and the staves (Work sponsored in part by the US Office of Naval Research).
Keywords
Barrel Stave Projectors (BSP);Flextensional projectors
Report Number
DREA-ORAL-1993-JONES-D-1 — Paper
Date of publication
21 May 1993
Number of Pages
16
DSTKIM No
97-03270
CANDIS No
503416
Format(s):
Hardcopy;Document Image stored on Optical Disk

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