Study on Hydrodynamic Forces and Safety of Huge Floating Body

为了利用海洋空间，浮式超大型海洋结构物被考虑在今天。一个能够解决噪声、有限的陆地空间和生态问题的浮动机场就是一个例子。为了实现这样的超大型海上结构物，必须对海洋环境中包括波浪行为在内的安全性和可靠性进行准确的评估。为此，必须准确了解风、浪、流等水动力外力，估算浮体的水弹性特性，并反馈给规划设计。本研究以在巴西作业的浮式海洋结构物为基础，对超大型海洋结构物的模具外力、水弹性响应、安全性、可靠性和姿态控制进行评估。在这项研究中，研究人员相互委托，海洋结构物的操作和实验的执行相互寻找。通过研究，我们可以了解到柱间相互作用和姿态控制等水动力特性。在姿态控制方面，提出了气动执行器的设计方案。对于执行器布置不均匀的情况，通过用振型组合表达弹性变形的数值模拟，最优控制可以给出较好的控制效果。通过对7m长模型进行模型试验，验证了姿态控制的可行性及其局限性。

For the utilization of ocean space, floating type very large offshore structures are taking into account today. A floating airport, which can resolve the problems of noise, limited land space and ecology, will be one example.In order to realize such kind of very large offshore structure, safety and reliability in ocean environment including behavior in waves must be evaluated accurately. For that purpose, hydrodynamic external forces like wind, waves and current must be known exactly and hydro elastic characteristics of the floating body must be estimated and feed backed to the planning and design. This research is aiming at the evaluation of die external forces, hydro elastic responses, safety, reliability and attitude control of very large offshore structure based on the oil related floating offshore structures operated in Brazil. For this research, researchers are delegated each other, and operation of offshore structures and execution of experiments are searched each other. From the research, we could know the characteristics of hydrodynamic forces like interaction between columns and attitude control. About attitude control, we proposed pneumatic actuator. For the case of non-uniform actuator arrangement, the optimal control could give relatively good results by carrying out numerical simulation expressing elastic deformation by modal composition. Furthermore, the possibility of attitude control and its limitation were examined by carrying out model test using 7m length model.