Extended radiated energy method and its application to a ship roll stabilisation control system

Large roll motions induced by sea waves can severely affect the ability of surface ships to perform their missions. The additional resistance caused by ship motions reduces ship speed, especially in moderate to high sea states. In addition, with increasing needs for energy savings and emissions reduction, the effect of added resistance on surface ship performance and control quality must be considered when a ship roll stabilisation control system is designed. As an application, a fin stabiliser system is developed with an advanced proportional-integral-derivative (PID) controller base using a genetic algorithm. A navy vessel is considered for demonstration purposes. Linear roll motions are controlled using active fins.