Study on Hydrodynamic Forces and Safety of Huge Floating Body

大型浮体水动力及安全研究

• 批准号: 08045033
• 负责人: HIRAYAMA Tsugukiyo
• 金额: $ 4.16万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08045033/
• 关键词: Very Large; Floating; Offshore Structure; Safety; Hydroelastic; Attitude Control; 姿勢構造物; 海洋制御

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.

为了利用海洋空间，浮动类型今天考虑到非常大的海上结构。一个可以解决噪音问题，有限的土地空间和生态问题的浮动机场将是一个例子。为了实现这种非常大的海上结构，海洋环境中的安全性和可靠性，包括波浪行为，必须准确评估。为此，必须确切地知道风动力学外力，例如风，波和电流，并且必须估算浮动体的弹性特征，并将其馈入计划和设计。这项研究旨在根据巴西运营的石油相关的浮动海上结构来评估外部力量，水力弹性响应，安全性，可靠性和态度控制。对于这项研究，研究人员互相委派，离岸结构的运作和实验的执行彼此搜索。从研究中，我们可以知道流体动力的特征，例如色谱柱和态度控制之间的相互作用。关于态度控制，我们提出了气动执行器。对于非均匀执行器排列的情况，最佳控制可以通过进行数值模拟来表达通过模态组成表达弹性变形的数值模拟。此外，通过使用7M长度模型进行模型测试来检查态度控制及其限制的可能性。