基于非线性耦合法的张力腿平台动力特性分析

摘要

以南海为目标海域,应用SESAM软件对TLP平台进行了时域非线性耦合分析,验证了平台在环境载荷作用下的运动性能.计算了二阶波浪力的传递函数,结合耦合分析法,评估了二阶波浪力对平台船体、张力腿、立管的影响.比较了完整的二阶传递法和Newman近似法的计算结果.结果证明,Newman近似法在计算深水平台低频慢漂响应时有较高的准确性.%An extended tension leg platform concept is accomplished aiming at South China Sea. The Sesam software was adopted to perform a fully-coupled time domain analysis,evaluating the motion characteristic of the TLP system. The quadratic transfer functions were calculated, and then the wave and current conditions were simulated to implement the coupled analysis to verify effects of second order wave forces on the vessel as well as on tethers and risers. Results of QTF method and Neman approximation were compared,and it is concluded that the Newman approximation is with high precision in calculating low-frequency response of a TLP.