Experimental investigation of higher harmonic wave loads and moments on a vertical cylinder by a phase-manipulation method
Experimental investigation of higher harmonic wave loads and moments on a vertical cylinder by a phase-manipulation method
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DOI：
10.1016/j.coastaleng.2020.103747
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发表时间：
2020-09
影响因子：
4.4
通讯作者：
Xingya Feng;P. Taylor;S. Dai;A. Day;R. Willden;T. Adcock
中科院分区：
文献类型：
--
作者：
Xingya Feng;P. Taylor;S. Dai;A. Day;R. Willden;T. Adcock
本文考虑了与海上风力涡轮机结构相关的波浪载荷作用在底部安装的垂直圆柱体上，研究了在工程设计中重要的非破碎波载荷的高次谐波。虽然我们考虑总力的测量，但我们的重点是在文献中较少关注的海床上施加的力矩。我们考虑一个经验的“斯托克斯样”模型，力或力矩的高次谐波的大小取决于线性力或力矩的时间序列提出了一个适当的权力和一个固定的系数。我们比较这种表示高品质的波浪水槽测量和完全非线性的势流模拟。在一般情况下，我们发现除了三重频率分量有显着的差异，所有的谐波结构良好的协议。我们还扩展了斯托克斯模型，并表明，谐波的时刻可以鲁棒地预测从力的谐波和适当的恒定的力矩臂为每个谐波，所以一般没有必要进行更详细的计算。
This paper considers wave loads on bottom mounted vertical cylinders in the regime relevant to offshore wind turbine monopiles, examining the higher harmonics of the loading from non-breaking waves which are important in engineering design. Although we consider measurements of total force, our focus is on the moments applied about the seabed which have received much less attention in the literature. We consider an empirical ‘Stokes-like’ model whereby the magnitude of the higher harmonics of force or moment are dependent on the linear force or moment time-series raised to an appropriate power and a fixed coefficient. We compare this representation to high quality wave flume measurements and fully non-linear potential flow simulations. In general we find good agreement for all of the harmonic structure except for the triple frequency component where there are significant discrepancies. We also extend the Stokes-like model and show that harmonics of moments can be robustly predicted from the force harmonic and an appropriate constant moment arm for each harmonic, so a more elaborate calculation is generally not necessary.