FREDYN Simulations of Halifax in 6 m Seas

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Authors
  1. McTaggart, K.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
In support of procurement of new maritime helicopters, DRDC Atlantic was tasked to simulate motions of the HALIFAX class during air operations in seaways with significant wave height of 6.0 m. Ship motions were simulated using FREDYN, a time domain strip theory program. For a peak wave period of 13.6 s and combinations of speed and heading within the allowable envelope for air operations, maximum motions during 30 minute simulations were 4.8 m for heave, 15.6 degrees for roll, and 6.2 degrees for pitch. For a steeper seaway with peak wave period of 8.9 s, there was no increase in maxima for allowable combinations of speed and heading. A single wave realization was used for each test case. A variability analysis indicates that the coefficient of variation in motion maxima due to seaway realization will be approximately 12 percent.

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Keywords
Computer programs (FREDYN);Capsizing;Time domain;Dynamic stability criteria;Surfriding;Severe seas;HMCS Halifax
Report Number
DRDC-ATLANTIC-TM-2002-090 — Technical Memorandum
Date of publication
01 May 2002
Number of Pages
26
DSTKIM No
CA021660
CANDIS No
518389
Format(s):
CD ROM

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