浅水中OSV锚泊定位分析研究

Research on the mooring position analysis of OSV in shallow water

本文采用数值计算方法对浅水中海洋平台支持船(OSV)的锚泊定位性能开展研究.首先,基于三维频域势流理论,对一艘OSV不同水深的水动力性能开展分析,计算了水动力系数、运动幅值响应算子、一阶波浪力和二阶波浪力.由于浅水中非线性效应显著,本文采用中场公式计算了该OSV全二阶波浪力传递函数(Full Quadratic Transfer Function,简称全QTF).然后,本文对不同水深下锚泊系统的水平刚度开展了分析,计算了不同水深下锚泊系统的水平刚度,研究了水深对锚泊系统水平刚度的影响.最后,采用准动态方法对不同水深下的OSV和锚泊系统开展时域分析,研究了水深对船体运动性能和锚索张力的影响.

Numerical studies have been carried out to investigate the mooring performance in shallow water. First, frequency domain analysis of an OSV is carried out in different water depths, based on 3D potential theory. Middle-field formulation is adopted to calculate the fully quadratic transfer function (QTF) of second order wave force. Furthermore, Static analysis for the OSV with mooring system is conducted to obtain the mooring stiffness. The effect of water depth on the mooring stiffness has been studied. Finally, time domain analysis is performed by quasi-dynamic method to achieve the motion response of the hull and the tension of mooring lines. The effects of water depth and full QTF on the mooring performance of floating structures in shallow water have been studied.