THE ACOUSTIC PERFORMANCE OF A CLASS III BARREL-STAVE FLEXTENSIONAL PROJECTOR

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Authors
  1. Jones, D.F.
  2. Reithmeier, C.G.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
A new broadband Class III barrel-stave flextensional projector has been built and tested for low-frequency sonar applications at the Defence Research Establishment Atlantic (DREA). The electroacoustic performance parameters of this projector were measured at the DREA Acoustic Calibration Facility on nearby Bedford Basin. The paper describes the construction of the double-shell Class III projector, presents its measured performance parameters, and compares its performance to that of a single-shell Class I barrel-stave projector of similar design. The Class III projector exhibits a mechanical quality factor of 2.1 near its fundamental flexural resonance frequency, which is lower than the quality factors normally produced by the other flextensional classes. In addition, useful acoustic power output is obtained from the Class III projector throughout the frequency range 1.1-7.5 kHz due to close coupling between the fundamental flexural mode and higher frequency radiating modes.
Keywords
Barrel Stave Projectors (BSP);Flextensional projectors
Report Number
DREA-PAPER-1996-JONES-1 — Paper
Date of publication
04 Jul 1996
Number of Pages
6
DSTKIM No
97-03276
CANDIS No
503409
Format(s):
Hardcopy;Document Image stored on Optical Disk

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