Study on the Dynamic Response Characteristics of the Integrated Structure of Semi-submersible Wind Turbine and Aquaculture Cages

Objective Aiming at the demand for the integrated development of deep-sea offshore wind power and aquaculture, this study investigates the dynamic response characteristics of a semi-submersible wind turbines with aquaculture cages, intending to provide a basis for its design and application. Methods Based on potential flow theory and the Morison equation, a coupled numerical model integrating the cage platform, net system, and mooring system was developed for a 5 MW semi-submersible wind turbine. The motion response characteristics of the integrated structure under various sea conditions were systematically analyzed. Results The net system acts as an additional damping element, effectively suppressing motion responses. Among different mesh sizes, the 3-meter configuration exhibits optimal stability. Under regular and irregular waves, the dynamic responses are highly sensitive to wave height and period, while power generation remains stable under various sea conditions. Under irregular waves, mooring tensions increase significantly with deteriorating sea conditions, and power spectrum analysis reveals low-frequency energy concentration, indicating that slow drift forces cannot be neglected in mooring design. Conclusions The integrated structure exhibits good environmental adaptability and power generation stability. This research provides theoretical support for the structural optimization and engineering application of deep-sea integrated wind-aquaculture systems.