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首页> 外文期刊>Ocean Engineering >Wave spectral analysis for design of a spar floating wind turbine in Mediterranean Sea
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Wave spectral analysis for design of a spar floating wind turbine in Mediterranean Sea

机译：地中海中翼梁式浮动风力发电机设计的波谱分析

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Floating offshore wind turbines (FOWTs) represent one promising concept for renewable energy production. However, the quantitative description of their dynamic behavior is extremely challenging, since it depends on the coupled effects of turbine aerodynamics, control system, hull hydrodynamics and mooring dynamics. In this context, hydrodynamic damping is a major source of uncertainty, particularly for relatively slender structures, such as spars. The aim of the present paper is to provide quantitative estimations of hydrodynamic damping ratios, natural frequencies and response spectra of the six rigid body motions of a spar FOWT under a wide range of wave conditions, including wind-generated sea states, swells and mixed seas. To this aim, the results of an open-sea experiment on a 1:30 model of OC3-Hywind spar in parked rotor conditions, carried out at the Natural Ocean Engineering Laboratory (NOEL) of Reggio Calabria (Italy), are analyzed and discussed. The above mentioned dynamic properties of the model are estimated through the spectral analysis of the rigid body motion time series collected during the experiment, classified depending on the input wave conditions. As a result, quantitative estimations of the dynamic properties of the model are provided, which can be used as input values for numerical models of the full-scale structure. Hydrodynamic damping ratios are estimated, including their variability depending on sea conditions, due to nonlinearity. Also, motion response spectra obtained for wind generated waves can be easily scaled-up to achieve a reasonable representation of the full-scale structure response under a range of relevant design conditions. Finally, additional information about nonlinear effects, coupling between degrees of freedom and close-to-resonance behavior of the model are drawn and commented.
机译：浮动式海上风力涡轮机（FOWT）代表了一种可再生能源生产的有前途的概念。然而，对其动态行为的定量描述极具挑战性，因为它取决于涡轮空气动力学，控制系统，船体流体动力学和系泊动力学的耦合作用。在这种情况下，流体动力阻尼是不确定性的主要来源，尤其是对于相对细长的结构（例如，翼梁）而言。本文的目的是提供在宽范围的波浪条件下，包括风生海状态，海浪和混合海在内的翼梁FOWT六个刚体运动的流体动力阻尼比，固有频率和响应谱的定量估计。 。为此，对在意大利雷焦卡拉布里亚的自然海洋工程实验室（NOEL）进行的在转子停工条件下OC3-Hywind晶石在1:30模式下进行的海洋实验的结果进行了分析和讨论。 。通过对实验过程中收集的刚体运动时间序列进行频谱分析，可以对模型的上述动态特性进行估算，并根据输入波的情况对其进行分类。结果，提供了模型动态特性的定量估计，可以将其用作全尺寸结构的数值模型的输入值。由于非线性，估计了流体动力阻尼比，包括其随海况变化的可变性。同样，可以容易地放大针对风浪获得的运动响应谱，以在一系列相关设计条件下获得合理的全尺寸结构响应表示。最后，绘制并注释了有关非线性效应，模型的自由度和接近共振行为之间耦合的其他信息。

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