EVALUATION OF NOISE REDUCTION COATINGS

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Authors
  1. Hamm, C.A.
  2. Szabo, J.P.
Corporate Authors
Guigne International Ltd, Paradise NFLD (CAN);Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The use of exterior hull tiles can have a significant impact on the noise signature of surface ships and submarines as demonstrated by trial on HMCS ANNAPOLIS. At this point, DND cannot compare the effectiveness of various commercial noise reduction tiles, except through large scale tests. This paper describes current work on developing small scale evaluation tests for noise reduction coatings. To partially simulate the radiation of acoustic energy from hulls, mechanically driven 2' x 2' x 3/8" steel plates were fluid-loaded on one side. Two water tanks of significantly different volume (5.8 m3 and 80m3) were used to see what role reverberation plays in the data interpretation. Radiation from non-tiled plates was measured and compared to the radiation from plates with damping tiles. Tiles of several thicknesses were used. Noise reduction spectra were also compared for plates of different shape to separate the effects of flexural damping and velocity reduction (decoupling).
Report Number
DREA-NAMT-95-5-PAP-1 — CONTAINED IN 99-00779
Date of publication
30 May 1995
Number of Pages
23
DSTKIM No
99-00801
CANDIS No
510365
Format(s):
Hardcopy;Document Image stored on Optical Disk

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