Accession Number:

ADA159358

Title:

Analysis of the MacKenzie Class Mast of HMCS QU'APPELLE.

Descriptive Note:

Technical memo.,

Corporate Author:

DEFENCE RESEARCH ESTABLISHMENT ATLANTIC DARTMOUTH (NOVA SCOTIA)

Personal Author(s):

Report Date:

1985-07-01

Pagination or Media Count:

31.0

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 AUAPPELLE. It has been determined that the masts 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 masts 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. Additional keywords Frequency response Dynamic tests VASTVibration and Strength Analysis Program. Author

Subject Categories:

  • Marine Engineering
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE