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Numerical study on global motion of Truss Spar in frequency and time domains for the Liwan 3-1 area |
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| Authors: | Lu Li Binbin Li Jinping Ou |
| Institution: | 1. Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, P. R. China 2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, P. R. China 3. Faculty of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, P. R. China;School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, P. R. China |
| Abstract: | Using frequency and time domain analysis, the authors analyzed the hydrodynamics and motion behavior of a Truss Spar platform at a water depth of 1500 m in the Liwan 3-1 area of the South China Sea. Firstly, the seakeeping ability is acquired in the frequency domain by calculating the hull’s hydrodynamics and comparing with a semi-submersible platform. The random wave analysis for 100-year, 10-year and 1-year return periods in Liwan 3-1 distinctly shows lower heave but larger surge and pitch responses of the Truss Spar than those of a semi-submersible. Secondly, 3-hour motions of the Truss Spar are predicted and compared in the time domain under 100-year return period conditions in Liwan 3-1 and the Gulf of Mexico. Thirdly, the hull/mooring line coupled and uncoupled models are compared. Finally, the responses of the Truss Spar under 10-year and 1-year return period conditions are assessed. The results reveal that the mooring line damping reflected by the coupled model distinctly decreases the low frequency motion. The maximum heave response for 100-year return period waves is 1.23m and below 0.1m for the case of 1-year return period. |
| Keywords: | Truss Spar South China Sea hydrodynamics semi-submersible mooring line |
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