系泊系统动力分析

Dynamic analysis of a mooring system

对于海上定位采用的系泊系统,采用时域有限元法建立了缆索方程的数值模型。以单点系泊和多点系泊的模拟比较为例。对于单点系泊,通过给定上端点正弦运动,对锚泊线进行动力计算,与试验结果进行了比较。对于多点系泊,针对一Spar平台的张紧系泊系统进行了理论计算,并将计算得到的上端点张力时历及统计结果与相应的模型试验结果进行了比较。通过比较可以发现理论计算结果与模型试验结果吻合良好。该数值模型可用于不同水深下平台和系泊系统的耦合计算等。

The numerical model is established by finite element method in time domain for a mooring line.A single mooring and multiple moorings are investigated as examples.To a single mooring line,the simulation is conducted with inputted upper end motion of the mooring line.The corresponding mooring tension is compared with that from the model test.To multiple moorings,the numerical simulation is carried out for the mooring system of a Spar.The time history of mooring line tensions and statistic results are compared between theoretical calculation and corresponding model test.The comparisons show that the theoretical results agree with the test results.The numerical model can be used in the coupled analysis of moored platforms with different water depths.