Abstract
The hybrid system of the offshore floating platform and wave energy converter provide a potential solution for achieve floating platform's vibration control by energy harvesting. However, existing hybrid systems still face significant challenges in maintaining effective multi-dimensional vibration control under changing wave frequencies and directions. To bridge this research gap, this paper proposes a novel floating platform synergizing built-in wave energy converter with decoupled power take-offs. The built-in configuration isolates the wave energy converter from ocean waves, thereby eliminating the hydrodynamic effects acting on the wave energy converter. Meanwhile, the decoupled design enables that the operating axes of power take-offs in wave energy converter align one-to-one with vibration directions of floating platform. These features allow the vibrations in different directions of the floating platform to be directly harvested by the WEC and converted into electrical energy. A classic Spar floating platform is used as an example, and the entire system of Spar synergizing built-in wave energy converter with decoupled power take-offs is designed. A multi-physical domain mathematical model is built and validated. Based on this model, an optimization framework oriented to multi-dimensional vibration control is proposed. The optimization results are analyzed to demonstrate that the proposed structure exhibits excellent multi-dimensional vibration control ability through energy harvesting under varying wave states.