Effects of second-order wave force and focusing location on dynamic response of a tension leg platform under freak wave

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (17) : 254-260.

CHANG Shuang1, HUANG Weiping1, WEI Dongze1,2, SONG Hong1

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Abstract

Here, based on the wave focusing and wave time series superposition model, freak wave time series satisfying definition of freak wave were generated. Dynamic response of a tension leg platform (TLP) was solved under freak wave to analyze effects of second-order wave force and freak wave focusing location on the TLP’s dynamic response. Results showed that freak wave can cause the TLP’s large amplitude motions of surge, heave and pitch; second-order difference frequency wave force can cause large oscillations in surge direction; pitch motion is caused mainly by second-order sum frequency wave force’s contribution; heave motion is composed of vertical high-frequency oscillation caused by second-order sum frequency wave force and large amplitude sinking movement caused by second-order surge difference frequency wave force; due to phase differences among wave forces with different frequencies, the TLP’s extreme value responses of surge, heave, and pitch appear during freak wave acting on rear column and center of the TLP.

Key words

freak wave / tension leg platform (TLP) / second-order wave force / focusing location

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CHANG Shuang1, HUANG Weiping1, WEI Dongze1,2, SONG Hong1. Effects of second-order wave force and focusing location on dynamic response of a tension leg platform under freak wave[J]. Journal of Vibration and Shock, 2020, 39(17): 254-260

References

[1] Walker D A G , Taylor P H , Taylor R E . The shape of large surface waves on the open sea and the Draupner New Year wave[J]. Applied Ocean Research, 2005, 26(3-4):73-83.
[2] Draper L. Freak wave[M]. Marine Observe, 1965, 35: 193-195．
[3] Klinting P , Sand S . Analysis of prototype freak waves[C]// Coastal Hydrodynamics. ASCE, 1987: 618-632.
[4] Kriebel D L, Alsina M V. Simulation of Extreme Waves In a Background Random Sea. International Society of Offshore and Polar Engineers, 2000.
[5] 刘晓霞. 三维波浪场中畸形波的数值模拟[D]. 大连, 大连理工大学, 2008.
Liu X X. Numerical Simulation of Freak Waves in Three Dimensional Wave Field[D]. Dalian, Dalian University of Technology, 2008.
[6] 谷家扬, 吕海宁, 杨建民. 畸形波作用下四立柱张力腿平台动力响应研究[J]. 海洋工程, 2013, 31(5):25-36.
Gu J Y, Lv H N, Yang J M. Dynamic response study of four column TLP in freak waves[J]. Ocean Engineering (in Chinese), 2013, 31(5):25-36.
[7] 肖鑫, 滕斌, 勾莹, 等. 畸形波作用下张力腿平台的瞬时响应[J]. 水运工程, 2009(5):9-14.
Xiao X, Teng B, Gou Y, et al. Transient response of TLP under freak waves[J]. Port & Waterway Engineering, 2009(5):9-14.
[8] Chandrasekaran S, Yuvraj K. Dynamic analysis of a Tension Leg Platform under extreme waves[J]. Journal of Naval Architecture & Marine Engineering, 2013, 10(1):59-68.
[9] Wang B, Tang Y G, Li Y, et al. Effects of Second-Order Sum-and Difference-Frequency Wave Forces on the Motion Response of a Tension-Leg Platform Considering the Set-down Motion[J]. Journal of Ocean University of China, 2018, 17(2): 311-319.
[10] Muehlner E, Banumurthy S, Murray J. Effect of High-Frequency Response on TLP Tendon Fatigue. ASME. International Conference on Offshore Mechanics and Arctic Engineering, Volume 1: Offshore Technology :221-230.
[11] LONGUET-HIGGINS M S. On the statistical distribution of the heights of sea waves[J]. Journal of Marine Research, 1952, 11:245-266.
[12] LONGUET-HIGGINS M S. Breaking waves in deep or shallow water[C]. Proc. 10th Conf. on Naval Hydrodynamics. 1974.
[13] 裴玉国, 张宁川, 张运秋. 畸形波数值模拟和定点生成[J]. 海洋工程, 2006, 24(4):20-26.
Pei Y G, Zhang N C, Zhang Y Q. Numerical simulation of freak waves and its generation at a certain location[J]. Ocean Engineering (in Chinese), 2006,24(4):20-26.
[14] MARINTEK. SIMO Theory Manual. 2009
[15] Senjanović I, Tomić M, Hadžić N. Formulation of consistent nonlinear restoring stiffness for dynamic analysis of tension leg platform and its influence on response[J]. Marine structures, 2013, 30: 1-32.
[16] Wang B, Tang Y G, Li Y, et.al. Nonlinear Random Motion Analysis of a Tension Leg Platform Considering the Set-down Motion of the Floating Body[J]. China Ocean Engineering. 2017, 31(2): 139-148.