深海几何形单柱式平台的运动分析

基于三维源法和Pinkster近场法分析了几何形单柱式平台(Geometric Spar)的运动特性,计算了其在不同频率下的水动力系数、一阶波浪干扰力(力矩)和二阶波浪慢漂力(力矩)以及一阶运动响应,平台上加装的垂荡板根据Morison公式计算.将理论得到的纵荡、垂荡和纵摇运动的一阶运动响应函数、运动谱以及统计值与相应的试验结果进行了比较,试验中浪向角180°,波浪采用西非的极限波浪.结果表明:理论值与试验结果符合较好;几何形单柱式平台纵摇运动的低频分量不可忽略;平台八角形的截面形状加上垂荡板使得这种柱型平台在深海开采中具有一定的优势.

The Analysis of the Motion of a Geometric Spar in Deep Water

Based on the three-dimensional source technique and Pinkster near field method the motion characteristics of a Geometric Spar in deep water were analyzed.The hydrodynamic coefficients,first-order wave forces(moments),second-order wave forces(moments) and first-order response of motions were calculated. The hydrodynamic coefficients of heave plates on the Spar were analyzed by Morison equation.The calculated first-order response function of motions,motion spectrums and statistical values of surge,heave and pitch motions were compared with the corresponding ones in model test.The results fit well.By the comparison it can be found that as to Geometric Spar,the low frequency motion component of pitch motion is important,it can not be ignored;the octagon in hull geometry adding heave plates makes the Spar have advantage on drilling in deep water.