ONGOING WORK EXAMINING CAPSIZE RISK OF INTACT FRIGATES USING TIME DOMAIN SIMULATION

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Authors
  1. McTaggart, K.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
This paper describes ongoing efforts to develop methods for predicting capsize risk of intact naval frigates. For a given ship condition, the risk of capsize is considered to be a function of ship speed, heading, significant wave height, and zero-crossing wave period. Implementation of the proposed procedure requires a numerical model for prediction of ship motions in severe seas. The program Fredyn, which uses a time domain strip theory approach, provides an appropriate combination of computational speed and accuracy for predicting capsize of slender naval frigates. When predicting capsize risk in irregular seas, the dependence of capsize occurrence on wave process realization must be considered. This dependence can be modelled by using Gumbel fits of maximum absolute roll angels obtained from several different realizations. The proposed risk analysis procedure can be extended to account for capsize avoidance procedures taken by ship operators.
Keywords
Time domain;Capsizing;Dynamic stability;Computer programs (FREDYN);Dynamic stability criteria
Date of publication
01 Sep 1998
Number of Pages
8
DSTKIM No
98-02304
CANDIS No
509159
Format(s):
Hardcopy;Document Image stored on Optical Disk

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