A Wave Basin Model Test Study for a Jackup Moored on the Dock
- Lei Liu (Shanghai Jiao Tong University) | Hongtao Yuan (Shanghai Waigaoqiao Shipbuilding Co., Ltd.) | Jianmin Yang (Shanghai Jiao Tong University) | Xinliang Tian (Shanghai Jiao Tong University) | Chunhui Li (Shanghai Waigaoqiao Shipbuilding Co., Ltd.) | Haining Lu (Shanghai Jiao Tong University)
- Document ID
- International Society of Offshore and Polar Engineers
- The Twenty-fifth International Ocean and Polar Engineering Conference, 21-26 June, Kona, Hawaii, USA
- Publication Date
- Document Type
- Conference Paper
- 2015. International Society of Offshore and Polar Engineers
- motion, Jackup, dock mooring, model test, tension, yaw motion stiffness.
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Offshore platforms under construction are normally moored on the dock during the outfitting stage. The safety of the platforms must be guaranteed during the whole stage of outfitting which may last for several months. This paper presents a wave basin model test study of a jackup moored on the dock in Shanghai Waigaoqiao shipyard in China. In the model test, the jackup and the sea states were scaled based on the Froude similarity law. The dynamic responses of the system, including the six degrees of freedom (6DOF) motions of the jackup and the barge, tensions on the mooring lines and the collision forces on the fenders, were measured in various sea states. Meanwhile, the current-and-windonly sea states were simulated and the dynamic responses were measured for comparison with those in the wave conditions. The mooring line tensions were found to exceed the strength of the lines in offshore wind conditions. And this phenomenon may be attributed to the decrease of the jackup’s yaw motion stiffness. In addition, several suggestions are proposed for optimizing the mooring system performance.
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