Motion and Dynamic Responses of A Semisubmersible in Freak Waves |
| |
| Authors: | LI Xin DENG Yan-fei LI Lei TIAN Xin-liang and LI Jun |
| |
| Affiliation: | State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China,State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;CIMC Offshore Co. Ltd., Shenzhen 518000, China,CIMC Offshore Co. Ltd., Shenzhen 518000, China,State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China and State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
| |
| Abstract: | The present research aims at clarifying the effects of freak wave on the motion and dynamic responses of a semisubmersible. To reveal the effects of mooring stiffness, two mooring systems were employed in the model tests and time-domain simulations. The 6-DOF motion responses and mooring tensions have been measured and the 3-DOF motions of fairleads were calculated as well. From the time series, trajectories and statistics information, the interactions between the freak wave and the semisubmersible have been demonstrated and the effects of mooring stiffness have been identified. The shortage of numerical simulations based on 3D potential flow theory is presented. Results show that the freak wave is likely to cause large horizontal motions for soft mooring system and to result in extremely large mooring tensions for tight mooring system. Therefore, the freak wave is a real threat for the marine structure, which needs to be carefully considered at design stage. |
| |
| Keywords: | motion response mooring tension semisubmersible freak wave mooring stiffness |
|
| 点击此处可从《海洋工程》浏览原始摘要信息 |
|
点击此处可从《海洋工程》下载全文 |
|
