ANALYSIS OF THE MACKENZIE CLASS MAST OF HMCS QU'APPELLE

Authors
  1. Pegg, N.G.
  2. Smith, D.R.
  3. Hussey, D.J.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The finite element program VAST, and experimental vibration data are used to analyze a serious vibration problem with the new mast on the Mackenzie class ship, DDE 261, HMCS QU'APPELLE. It has been determined that the mast's natural frequency of vibration falls into the range of excitation frequencies produced by the propeller shaft rotation. It is postulated that the propeller excitation is driving both resonant hull and mast modes together. After analysis of some possible solutions using VAST, it is determined that there is no simple solution that would shift the mast's natural frequency completely out of the range of excitation resulting from the propeller shaft rotation. However, some trial solutions are suggested that may provide sufficient attenuation of the mast vibration for safe and normal operation of the ship. In addition, an analysis approach is suggested which would avoid this type of problem in future designs.
Report Number
DREA-TM-85-211 — Technical Memorandum
Date of publication
15 Jul 1985
Number of Pages
28
DSTKIM No
85-03252
CANDIS No
48021
Format(s):
Hardcopy;Originator's fiche received by DSIS

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