INVESTIGATION OF HULL EXCITATION CHARACTERISTICS ON CFAV QUEST

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Authors
  1. Kennedy, J.L.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The NSMB Co-operative Research Ships organization is investigating various aspects of hull excitation from highly skewed propellers. As part of this effort DREA measured hull excitations and made concurrent cavitation observations onboard CFAV QUEST. Results from these are presented and discussed. Varying amounts of sheet, leading edge vortex, tip vortex and hub vortex cavitation were observed. Bursting of the vortex cavitation was prominent in many cases. As ship speed and the amount of cavitation increased, so did the level of the higher harmonics of blade rate in the hull excitation spectra. There was some limited correlation between the appearance of the different forms of cavitation and the appearance of specific harmonics in the ull excitation. There was also data that indicated that no simple correlation would be possible. For instance, the harmonics at five and six times blade rate depended on the amount rather than the nature of the cavitation.
Report Number
DREA-TM-98-208 — Technical Memorandum
Date of publication
01 Feb 1998
Number of Pages
66
DSTKIM No
98-01273
CANDIS No
508041
Format(s):
Hardcopy;Document Image stored on Optical Disk

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