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OFFSHORE ENGINEERING

机译：海洋工程

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To minimize the computation burdens of long-term analysis, the mooring line top tensions under various short-term sea states were predicted using the pre-calculated nonlinear time domain analysis results of some selected sea states. A nonlinear au-toregressive with an exogenous input (NARX) technique was introduced with a finite nonlinear memory length to predict the top-tension of a mooring line of the box-type floating production storage and offloading (FPSO). The NARX was designed in such a way that it takes the floater's motions as its input and produces the mooring line top tension as an output. After training the NARX using the pre-calculated time series of the motions and tensions of some selected sea states, the tension time histories of different sea sates were predicted and compared with the direct time domain analysis results. In addition, to explore the nonlinearity of the system and its contribution to the response, the transfer functions of different orders were extracted after expanding the NARX equation using a Taylor series expansion. The nonlinear contributions coming from both the 3rd and 5~(th) order were significant.
机译：为了最大程度地减少长期分析的计算负担，使用某些选定海况的预先计算的非线性时域分析结果，预测了各种短期海况下的系泊缆顶部张力。引入了带有外来输入的非线性自回归（NARX）技术和有限的非线性存储长度，以预测盒式浮动生产存储和卸载（FPSO）系泊缆的最高张力。 NARX的设计方式是将浮子的运动作为输入，并产生系泊缆的顶部张力作为输出。在使用预先计算的某些选定海况的运动和张力时间序列训练NARX之后，预测了不同海域的张力时间历史，并将其与直接时域分析结果进行了比较。此外，为了探索系统的非线性及其对响应的影响，使用泰勒级数展开式展开了NARX方程后，提取了不同阶的传递函数。来自三阶和第五阶的非线性贡献是显着的。

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    《Oceanographic Literature Review》 |2019年第6期|1390-1395|共6页
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