Efficient Predictions of Wave-Induced Ship Motions for Ship Defence Models

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Authors
  1. McTaggart, K.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN)
Abstract
This report presents a library of wave-induced ship motion modules for use in simulation applications. The library is intended for ship defence models and other simulation applications requiring robustness, fidelity, and high computational speed. Ship motions in long-crested random seaways are determined using ship motion response amplitude operators (RAOs) computed by DRDC Atlantic’s SHIPMO7 program. The output ship motions are given as perturbations relative to the steady or slowly varying input ship course. Time domain predictions from the library have been verified through comparisons with frequency domain predictions from SHIPMO7, which has undergone extensive validation. The library is available as a Python module and also as a dynamically linked library (DLL) callable from C++ and other compiled languages. During benchmarking on a 800 MHz Pentium III computer, ship motion predictions required approximately 0.002s per time step, giving performance 50 times faster than real time for a typical simulation application using a time step size of 0.1s.

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Keywords
surge;sway
Report Number
DRDC-ATLANTIC-TM-2004-041 — Technical Memorandum
Date of publication
01 Feb 2004
Number of Pages
52
DSTKIM No
CA025216
CANDIS No
522800
Format(s):
CD ROM

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