More and more vessels for offshore engineering applications have a roll period beyond 20 seconds in order to avoid the wave frequency excitations on the roll motion. That is particularly true for the latest drilling vessels. However, this will lead to an unexpected second-order roll motion of the ships. This paper will present a new methodology to evaluate the second-order roll motions of the ships in random seas. The higher-order boundary element method (HOBEM) has been utilized to generate the second order difference-frequency roll excitations on the ships and the second-order ship roll motions were predicted by a frequency-domain method. A series of model tests have been conducted and the test results have a good agreement with the numerical predictions. Therefore, this new method has been verified and validated.
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ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering
June 8–13, 2003
Cancun, Mexico
Conference Sponsors:
- Ocean, Offshore, and Arctic Engineering Division
ISBN:
0-7918-3681-9
PROCEEDINGS PAPER
On Second-Order Roll Motions of Ships
Yonghui Liu
Yonghui Liu
FMC SOFEC Floating System, Inc., Houston, TX
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Yonghui Liu
FMC SOFEC Floating System, Inc., Houston, TX
Paper No:
OMAE2003-37022, pp. 33-38; 6 pages
Published Online:
January 23, 2009
Citation
Liu, Y. "On Second-Order Roll Motions of Ships." Proceedings of the ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering. Volume 1: Offshore Technology; Ocean Space Utilization. Cancun, Mexico. June 8–13, 2003. pp. 33-38. ASME. https://doi.org/10.1115/OMAE2003-37022
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