Seakeeping for Autonomous Ship in Heavy Weather

[Kennebec_Captain]

Heavy Weather Tactics

I’ve tested the theory on fishing boats in rough weather in the Bering Sea. It works well most of the time… I think a lot has to do with the vessel’s superstructure configuration and sail area. Not every ship will lay in the most ideal way when taken out of power.

Parametric Rolling

In certain conditions a ship will roll heavily, if mariners are not aware of the phenomena of parametric rolling it will seem inexplicable. For example the seas can be from dead ahead and the ship will take quick, heavy rolls. Parametric rolling is an unstable phenomenon, which can quickly generate large roll angles that are coupled with significant pitch motions. The rolling occurs in phase with pitch [Extreme Rough Sea - Cruiser Roll Motions] [Parametric roll]