Hydrodynamic and aerodynamic response characteristics of floating wind-aquaculture platforms
The floating wind-aquaculture multi-functional platforms act as a more comprehensive and efficient way of using deep-sea resources.However,this multifunctional offshore equipment presents more complex dynamic characteristics due to the integration of the dynamic features of both floating wind turbines and fish farming cages.Taking into account of the fluctuating wind load on the wind turbine,the variable speed and pitch control,the wave load on the floating body,and the viscous load on the fish-net system under the combined effect of wind,wave and current,the dynamic response characteristics of the wind-aquaculture platform are studied by using the method of hydro-aero-servo integration on the entire system.Specifically,attention was given to the motion response of the platform,the mooring line tension,cross-section load of steel structure between pontoons and the aero-elastic response of the blades under different sea conditions.Additionally,the effects of the fish net on relevant motion responses are evaluated in this study.The results show that:the surge and pitch of wind-aquaculture platform mainly consist of low frequency slow-drift and wave frequency motion.As the sea state deteriorates,the response of wave frequency component gradually intensifies.The mooring line tension is related to the platform motion,and the load dominant frequency aligns with the surge and pitch motion.The nets primarily affect platform motion and mooring line load in the range of low frequency,exerting a suppressive effect in most cases.The axial force of steel structure exhibits a primary contribution to the cross-sectional load between different pontoons compared to the bending moments,and it is dominated by wave-frequency component.However,under the influence of mooring lines load,the axial force between pontoons on the wave side also experiences a significant low-frequency component.The blade's elastic response is dominated by the wind speed and rotational speed during operation,while the surge and pitch motion play a major role in its response when the turbine is shutdown.The numerical results provide reference for ensuring structural safety in the design of floating wind-aquaculture platforms.
floating wind-aquaculture platformwind turbinefish-nethydro-aero-servo integrationmotion responsemooring line loadcross-section load
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