Abstract
This paper describes a new anti-broaching steering system. This system aims to prevent broaching, which is the major mode of capsizing or large roll angle for a relatively high-speed ship in following and quartering seas. It is a kind of auto pilot system that realises extremely large rudder angle for small deviation from the desired course. Experiment was carried out in a seakeeping and manoeuvring basin for a self-propelled model equipped with the anti-broaching steering system. While the model suffered typical broaching in quartering waves with a conventional auto pilot, the model with this steering system successfully avoided broaching under the same operational and environmental conditions.
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