ACOUSTIC PROPERTIES OF SONAR DOME MATERIALS

PDF

Authors
  1. Liu, Q.
  2. Guigne, J.Y.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Guigne International Ltd, Paradise NFLD (CAN)
Abstract
The acoustic properties of composite panels made from high strength polyethylene Spectra Fiber were compared to conventional glass fiber composites, and to the double walled stainless steel design currently used in the C5 Sonar Dome. Characterization consisted of insertion loss measurements from 0-40 kHz using a parametric array projector, and "self noise" measurements from 0-6 kHz. All the panels but the cyanate-based 4H Spectra Fiber composite panel tested had very low insertion losses (<1 dB) below 10 kHz at normal incidence. Apart from the epoxy-based 4H panel, the Spectra Fiber composite panels had lower insertion losses, and less angular dependence of the insertion loss, than both the glass fiber composites and the double walled stainless steel panel in the 0-40 kHz range. Of the two different resin systems examined, epoxy and cyanate ester, the cyanate ester resin based composite panels had slower water uptake rates than the epoxy panels, but there was no significant difference in the insertion losses below 10 kHz. In general, the angular dependene of the insertion losses below 10 kHz was minimal with the exception of the 4H epoxy Spectra Fiber panel, which had a slightly higher angular dependence. Aging the composite panels in water resulted in some slightly reduced insertion losses, with the exception of the 4H cyanate Spectra Fiber panel. TRUNCATED
Keywords
Spectra Fiber
Report Number
DREA-CR-96-420 — Contractor Report
Date of publication
01 May 1996
Number of Pages
95
DSTKIM No
96-02587
CANDIS No
499040
Format(s):
Document Image stored on Optical Disk;Hardcopy

Permanent link

Document 1 of 1

Date modified: