Effect of Moment Characteristics of Truncated Mooring System on Roll and Pitch Motions of a Semi-Submersible Platform

Abstract

Abstract:

Based on a semi-submersible platform operated at a water depth of 1.5 km, five truncated mooring systems were designed for the model test, which have similar horizontal restoring force characteristics, vertical force-horizontal displacement characteristics and top tension-horizontal displacement of single line as the full depth system, but different restoring moment characteristics. The timedomain coupling analysis method was applied to obtain and compare the roll and pitch motions using these different truncated mooring systems. The simulation results were compared with model test data. It is concluded that moment characteristics similarity has a significant impact on the roll and pitch motions of a semi-submersible platform. And the impact increases as the horizontal offset of the platform becomes larger. Therefore, keeping similar moment characteristics with the full depth system is essential while designing the truncated mooring system.

Key words: equivalent water depth truncation, moment characteristics, semi-submersible platform, roll and pitch motions

CLC Number:

U 661.7

QIAO Xuefeng,XIAO Longfei,YANG Lijun. Effect of Moment Characteristics of Truncated Mooring System on Roll and Pitch Motions of a Semi-Submersible Platform[J]. Journal of Shanghai Jiaotong University, 2014, 48(04): 450-456.

References

［1］Wang H W, Luo Y, Hu K Y, et al. Mooring truncation design of a deepwater SPAR［J］. Journal of Marine Science and Application, 2010, 9(2): 168174.

［2］Su Y H, Yang J M, Xiao L F. Hybrid verification of a deepwater celltruss spar［J］. China Ocean Engineering, 2009, 23(1): 114.

［3］赖智萌, 肖龙飞, 寇雨丰, 等. 新概念深水半潜式生产平台水动力截断试验与数值计算［J］. 上海交通大学学报, 2013, 47(2): 329334.

LAI Zhimeng, XIAO Longfei, KOU Yufeng, et al. Truncated model test and numerical simulation on hydrodynamics of a new concept semisubmersible platform ［J］. Journal of Shanghai Jiaotong University, 2013, 47(2): 329334.

［4］Sweetman B. Airgap analysis of floating structures subject to random seas: prediction of extremes using diffraction analysis versus model test results［D］. Stanford: Stanford University, 2001.

［5］曾志, 杨建民, 李欣, 等. 半潜式平台气隙数值预报［J］. 海洋工程, 2009, 27(3): 1422.

ZENG Zhi, YANG Jianmin, LI Xin, et al. Air gap prediction of a semisubmersible platform［J］. The Ocean Engineering, 2009, 27(3): 1422.

［6］Iwanowski B, Lefranc M, Wemmenhove R. CFD simulation of wave runup on a semisubmersible and comparison with experiment［C］∥ ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. Hawaii: American Society of Mechanical Engineers, 2009: 1929.

［7］郑成荣,范菊,缪国平,等.深水FPSO时域耦合动力分析［J］.水动力学研究与进展A辑,2012,27(4):376382.

ZHENG Chengrong, FAN Ju, MIAO Guoping, et al. Coupled dynamic analysis of a deepwater FPSO in time domain［J］. Journal of Hydrodynamics, 2012, 27(4): 376382.

［8］DET NORSKE VERITAS. SESAM User’s ManualHydroD［M］. Norway: DNV, 2011.

［9］DET NORSKE VERITAS. SESAM User’s ManualDeepC［M］. Norway: DNV, 2010.

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