海洋内孤立波作用下张力腿平台动力响应特性

Dynamic response characteristics of a tension leg platform under internal solitary waves

基于三类内孤立波理论KdV、eKdV和MCC的适用性条件,将张力腿简化为非线性梁模型,采用Morison和Froude-Krylov公式计算张力腿平台的内孤立波动态载荷,结合浮体有限位移时域运动方程,建立了内孤立波与张力腿平台相互作用的理论模型。以东沙群岛附近海域某实测内孤立波为对象,对典型张力腿平台(ISSC-TLP)在内孤立波作用下的动态载荷、运动响应以及张力腿张力的变化特性进行数值分析。研究表明,内孤立波不但对张力腿平台产生突发性冲击载荷,使其产生大幅度的纵荡位移,还会显著增加张力腿的张力。因此,在张力腿平台的设计应用中,内孤立波的影响不可忽视。

Based on the applicability conditions of three internal solitary wave theories（Kd V, e Kd V and MCC）, a theoretical model for analyzing the characteristics of internal solitary waves with the tension leg platform（TLP） by simplifying the tendon leg as a nonlinear beam is presented by using coupled motion equations of the floating body in time domain, where the dynamic loads on the platform due to internal solitary waves are calculated with Morison and Froude-Krylov formulas. To simulate the variation characteristics of the dynamic loads, motion response and tether tension for a classical TLP（ISSC-TLP）,the observed data near Dongsha Islands are used as the characteristic parameters of internal solitary waves. The results show that internal solitary waves will give rise to the sudden impact loads and motion response for TLP, as well as remarkable increase of tether tension. Therefore, the influence of internal solitary waves on the hydrodynamic characteristics of TLP can not be neglected in its design and application.