Insertion Loss of Composite Sonar Dome Materials

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Authors
  1. Szabo, J.P.
  2. Hiltz, J.A.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
This document describes the results of research carried out at DREA in support of a DMSS tasking to investigate the acoustic properties of composite sonar dome materials. For thin panels (10 mm) at low frequencies (< 10 kHz), the composite materials studies here, as well as the double walled C5 stainless steel sonar window currently used on Canadian naval vessels, exhibited low insertion losses (< 1 dB). For thicker panels or higher frequencies Spectra Fiber (TRADEMARK) is a much better reinforcing fibre than either glass or carbon fibre, in terms of insertion loss. spectra Fiber composite panels also had much better acoustic properties in the 10 - 50 kHz range than the C5 stainless steel sonar window (1 dB versus 10 dB at 40 kHz). There was no significant difference in the acoustic properties of panels fabricated with 4 harness satin or 8 harness satin fibre weaves. Panels made from epoxy or cyanate ester resin also had similar insertion losses. The effect of impact damage on the acoustic properties of Spectra and glass reinforced panels was not significant for 10 mm panels at frequencies < 10 kHz. However, there was a significant increase (up to 88 dB) in the insertion loss resulting from impact damage for thicker panels at higher frequencies. TRUNCATED
Keywords
Spectra Fiber;C5 sonar;Acoustic window;Parametric arrays
Report Number
DREA-TM-1999-038 — Technical Memorandum
Date of publication
01 Apr 1999
Number of Pages
56
DSTKIM No
CA000649
CANDIS No
512071
Format(s):
Hardcopy;Document Image stored on Optical Disk

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