Control of ship roll motion by active fins using fuzzy logic

Abstract Fuzzy logic controller to reduce the roll motions of a ship using active fins is discussed in this article. Roll minimization is a requisite for various operations in the sea. Fin action provides enhanced state of stabilization especially when the vessel is performing a fast manoeuvring amidst rough environmental disturbances. The fins, in turn, are activated by electro-hydraulic mechanism based on the in-built intelligence as per suitable control theories. In this article, the fin pairs are activated using fuzzy logic control algorithm. The design of fuzzy controller is simple and need not require complicated mathematical procedures. A frigate-type warship is considered for the demonstration purpose. The control output is the fin angle. Non-linear roll motions are controlled using active fins. Fins lift characteristics in hydrodynamic flow were studied using CFD package Fluent. Input variable fuzzification, fuzzy membership functions and output set de-fuzzification are discussed in the article. A fairly good amount of reduction in roll amplitude is achieved through various simulations in random sea. The approach can be used for irregular sea conditions.

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