Hydromechanic aspects of the design of fin stabilisers
Author Dallinga, R.P.
Title Hydromechanic aspects of the design of fin stabilisers
Conference/Journal The Royal Institution of Naval Architects International Conference on Ship Motions & Manoeuvrability, London, U.K.
Year 1993

Abstract
Based on experiments with a captive and a free-running ship model equipped with active fin stabilisers the nature of the roll stabilising problem was explored. Important hull-fin and fin-hull interferences were identified. The results also indicated that the drag penalty of active stabilisers may be surprisingly low.

Shipowners become increasingly aware of the importance of quantifying the seakeeping characteristics of their ships. A trend which is supported strongly by the fact that suitable criteria become available for the dynamic behaviour of ships. Two important factors affecting the comfort and safety of passengers on board yachts, ferries and cruise liners are the roll response and related transverse acceleration levels. On most ships active fin stabilisers are installed to reduce these motion components.

Experience from contract research, in which theoretical calculations and experimental work are used in conjunction on a routine basis, lead to the observation that the accuracy of theoretical predictions of the performance of fin stabilisers was frequently rather disappointing. Therefore, dedicated experimental work was performed to improve the understanding of the physical nature of the design problem. The results were used to establish basic requirements for adequate mathematical modelling.

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