Harmonic structure of wave loads on a surface piercing column in directionally spread and unidirectional random seas
Harmonic structure of wave loads on a surface piercing column in directionally spread and unidirectional random seas
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定向扩展和单向随机海面刺穿柱上波浪载荷的谐波结构
DOI：
10.1007/s40722-022-00276-5
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发表时间：
2023
影响因子：
1.9
通讯作者：
Mj D
中科院分区：
文献类型：
--
作者：
Mj D
我们研究了波浪诱导载荷在垂直圆柱体上的谐波结构，其尺寸与用于支持海上风力涡轮机的圆柱体相当。许多海上风力发电机设计时，结构共振是基波加载周期的2 ~ 3倍，可能受到高次波加载的激发。检验了“stokes型”力模型的适用性。我们分析了单向海况和定向海况的实验数据。我们证明了一种新的信号处理方法可以从随机时间序列中提取近似谐波分量。提取的谐波显示为遵循“stokes样”模型，其中频率较高的谐波与线性内联力分量的n次方及其希尔伯特变换成正比。结果表明，该模型对力的三次谐波分量拟合较差，与文献结果一致。一个重要的新结果是，当拟合成线性线性力及其希尔伯特变换的幂时，扩张型和单向型海的谐波系数几乎相同。这一发现有可能大大简化产生新的波长与圆柱体和波长与深度比的谐波数据的过程。这也意味着，在定向海中，相对于在单向海中相同分量的谐波的内线分量的大小为，其中为入射波场的均方根定向传播角。因此，在定向传播的海洋中，高次谐波的重要性将低于单向谐波。结果表明，本文所采用的计算快速谐波分解方法可以在大范围的现实的单向和定向传播海态中再现非破碎波的载荷形状和大小。所提出的力模型具有作为非线性波浪荷载计算快速预测的工程工具的潜力。
We investigate the harmonic structure of wave-induced loads on vertical cylinders with dimensions comparable to those used to support offshore wind turbines. Many offshore wind turbines are designed, so the structural resonance is two or three times the fundamental wave loading period, which may be excited by higher harmonics of wave loading. The suitability of a ‘Stokes-type’ model for force is examined. We analyse experimental data for unidirectional and directionally spread sea-states. We demonstrate that approximate harmonic components may be extracted from a random time series, using a novel signal processing method. The extracted harmonics are shown to follow a ‘Stokes-like’ model, where the higher harmonics in frequency are proportional to the n-th power of the linear inline force component and its Hilbert transform. Results show that the third harmonic component of force is fitted less well by this model, which is consistent with the literature. A key new result is that the harmonic coefficients for spread and unidirectional seas are nearly identical when fitted as powers of the linear inline force and its Hilbert transform. This finding has the potential to greatly simplify the process of generating harmonic data for new wavelength to cylinder and wavelength to depth ratios. This also implies that the size of the inline component of theharmonic for force in a directional sea relative to the same component in a unidirectional sea scales as, whereis the rms directional spreading angle of the incident wave field. Hence, higher harmonics will be of less importance in directionally spread seas than unidirectional ones. We show that the computationally fast harmonic decomposition approach taken here can reproduce the shape and magnitude of the loading from non-breaking waves waves in a wide range of realistic unidirectional and directionally spread sea-states. The proposed force model has potential as an engineering tool for computationally fast prediction of nonlinear wave loads.
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影响因子：
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DOI：
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发表时间：
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期刊：
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影响因子：
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作者：
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DOI：
--
发表时间：
1985
期刊：
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