Optimum Design Method of the Group of Hexagonal Floating Platforms for Ocean Wind Farm

本研究的最终目标是开发由多个六边形浮式平台组成的大型海上风电场，以利用海洋可再生能源。本研究的浮动平台是稳定的摇摆和俯仰运动之间的波浪，从Spar型浮动近海风浮标，它是用于多用途，如太阳能电池板和波浪发电设备的基础，包括渔业活动的六边形平台内。一个单元平台由6个垂直圆柱体支撑，这些圆柱体通过桁架连接。利用多浮体相互作用理论计算了平台在波浪中的水动力。为了保证浮式平台的安全，应考虑在极端环境条件下作用在平台上的波浪和风荷载。计算流体动力学（CFD）分析是应用和发展这种恶劣的条件。在水池中进行了风浪作用下的模型试验。最后，在本研究的基础上，确定了博多湾浮式平台的主要尺寸。从2011年12月开始在博多湾安装了直径为18米的六边形平台，并在真实的海洋中进行了为期一年的各种测量，包括气象数据，风力涡轮机和太阳能电池板的电力以及平台的运动。

Final goal of the present study was planned to develop the large scale offshore wind farm consisting of the many numbers of the hexagonal floating platforms for the utilization of the ocean renewable energies. The floating platform of the present study is stable to the rolling and pitching motions among waves, deferent from the spar-type floating offshore wind buoy, and it is used for the multi-purpose such as the base of the solar panels and the wave power apparatus, including the fishery activities inside the hexagonal platform. A unit platform is supported by the 6 vertical cylinders which are connected by the truss. The hydrodynamic forces/moments of the platform among waves are calculated by the interaction theory for many numbers of floating bodies. For the safety of the floating platforms, the wave and wind loads acting on the platforms should be considered under the extreme environmental condition. The computational fluid dynamics(CFD) analysis is applied and developed for such severe conditions. The model tests under the winds and waves were conducted in the tank. Finally, the principal dimensions of the floating platform in Hakata Bay were determined on the basis of the present study. The hexagonal platform of 18m diameter has been installed in Hakata Bay since December 2011 and the various measurements including the meteorology data, the electric powers by the wind turbines and solar panels, and motions of the platform are undergoing in the real sea for one year.