内孤立波中半潜平台动力响应特性  

Dynamic responses of a semi-submersible platform in internal solitary waves

作　　者：尤云祥[1] 李巍[1] 胡天群[1] 曲衍 肖越 范模 

机构地区：[1]上海交通大学海洋工程国家重点实验室,上海200240 [2]中海油研究总院,北京100027

出　　处：《海洋工程》2012年第2期1-7,19,共8页The Ocean Engineering

基　　金：中海油-上海交大”深水工程技术中心”综合科研课题;国家863计划资助项目(2008AA09Z316,SQ2009AA09z3487713)

摘　　要：基于内孤立波mKdV理论,采用时域有限位移运动方程,结合改进的Morison公式,研究了两层流体中内孤立波与带分段式悬链系泊约束半潜平台的相互作用问题。针对东沙群岛南部海域附近某实测内孤立波特征参数,计算分析了在该内孤立波作用下SEDCO-700型半潜平台的内孤立波载荷、运动响应及其系泊张力的变化特性。研究表明,内孤立波不仅会对半潜平台产生突发性冲击载荷作用,使其产生大幅度水平漂移运动,并导致其系泊张力显著增大,因此在半潜平台等深海平台的设计与应用中,内孤立波的影响是不可忽视的。Based on the mKdV theory of internal solitary waves in a two-layer fluid, a theoretical model for analyzing the interaction of internal solitary waves with semi-submersible platforms connected to the sea floor by multi-component catenary mooring lines is presen- ted by use of the coupling motion equations of the three degrees of freedom for the floating body combining with the modified Morison formula. The observational data near the Dongsha Island are used as the characteristic parameters of the internal solitary wave, and the characteristics of hydrodynamic load and motion response as well as the tension change of catenary mooring lines for a SEDCO-700 semi-submersible platform due to such an internal solitary wave are computed and analyzed. Results show that internal solitary waves will give rise to sudden impact load and motion response with the large amplitude, as well as remarkable increase of the catenary moor- ing line tension. Therefore, the influence of internal solitary waves on the dynamic behavior of deep-sea platforms including semi-sub- mersible platforms can not be neglected in their design and application.

关 键 词：两层流体 内孤立波 半潜平台 动力响应 

分 类 号：P751[交通运输工程—港口、海岸及近海工程] O352.2[天文地球—海洋科学]