Improvement of the Stability of a Floating Offshore Wind Turbine by a Centreboard and Heave Plate System

This paper presents an experimental study on the dynamics of a semisubmersible platform conducted in an enclosed wave-wind flume (WWF). The study analyzes the effects of different wind velocities and sea states within a controlled, enclosed environment. The study also investigates the role of a Centreboard and Heave plate (CH) system in decreasing the platform's motions. The study confirms a significant decrease in overall platform displacement, approximately 1.8 cm, along the longitudinal plane under various sea conditions due to the implemented system. Notable changes were also observed in the Response Amplitude Operators (RAO) at different periods, particularly in pitch motion, which showed an average reduction of 0.761 °/cm. The attachment of the Centreboard and Heave plate (CH) played a crucial role in enhancing the stability of the platform, particularly in reducing angular motion. The surge, heave, and pitch responses consistently showed lower values, with a mean decrease of 0.6° across test cases. These results provide strong validation data and demonstrate the high effectiveness of the system in improving the stability of maritime platforms.