风浪流成长全过程单点系泊FPS O运动低频响应极值研究

为了探求风浪流成长全过程对应的单点系泊FPSO低频响应极值，应用三维势流理论及非线性时域耦合分析方法，研究了单点系泊FPSO低频运动响应与风浪流入射角度之间的关系，得出了给定风浪流大小前提下最危险的入射角度，计算了风浪流载荷在发展、顶峰、消亡各不同阶段对应的船体低频运动响应极值。结果表明：单点系泊FPSO低频响应与风浪流入射角度密切相关，且响应最大值可能并不出现在有义波高、风速、流速最大的顶峰时期，而可能出现在有义波高、风速、流速较小但风浪流入射角度呈强非线性的发展或消亡阶段。因此，在研究单点系泊FPSO的低频响应极值时，必须考虑风浪流成长过程中的发展和消亡阶段。文中考虑了易被忽略的风浪流成长过程中入射角度呈强非线性的发展和衰亡阶段，为单点系泊FPSO低频响应特性的分析提供了有益参考。

Low frequency extreme response of single-point moored FPSO during the whole process of growing of wind/wave/current

To explore the low frequency extreme response of single-point moored FPSO during the whole process of growing of wind/wave/current,three-dimensional potential flow theory and nonlinear time domain coupled analysis method was applied,the relationship between incident angle of wind/wave/current and low frequency motion re-sponse of single-point moored FPSO was investigated,low frequency extreme response of single-point moored FPSO during the whole process of growing of wind/wave/current was studied.The results show that the low frequency motion response is related to the incident angle of the wind/wave/current,and the biggest low frequency motion re-sponse maybe not appear in peak stage,but appear in development or decay stage.Therefore,in the study of low frequency motion response of single-point moored FPSO,one must consider the development or decay stage.It of-fers an important reference to single-point moored FPSO hydrodynamic performances analysis.