Abstract
Based on the linear superposition technique, a hydrodynamic mathematical model of the SWATH ship motion simulation with controllable fin in longitudinal irregular waves is developed. The self-tuning fuzzy control algorithm including a back-propagation-based fuzzy controller and the gradient descent method is applied to reduce the pitch motion of the SWATH ship with control stabilizing fins. The surge force and viscous force is also included in the present hydrodynamic mathematical model. After comparing with the results using the static fuzzy controller, we find that the self-tuning fuzzy controller appears to be more efficient for operating stabilizing fins while the ship speed is high, especially in following waves. Therefore the fuzzy control with self-tuning algorithm developed here can be regarded as an efficient tool for analyzing the performance of control fins of the SWATH ship in irregular waves.
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