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Influence of second order wave excitation loads on coupled response of an offshore floating wind turbine
International Journal of Naval Architecture and Ocean Engineering ( IF 2.2 ) Pub Date : 2020-02-04 , DOI: 10.1016/j.ijnaoe.2020.01.003
Zhenju Chuang , Shewen Liu , Yu Lu

This paper presents an integrated analysis about dynamic performance of a Floating Offshore Wind Turbine (FOWT) OC4 DeepCwind with semi-submersible platform under real sea environment. The emphasis of this paper is to investigate how the wave mean drift force and slow-drift wave excitation load (Quadratic transfer function, namely QTF) influence the platform motions, mooring line tension and tower base bending moments. Second order potential theory is being used for computing linear and nonlinear wave effects, including first order wave force, mean drift force and slow-drift excitation loads. Morison model is utilized to account the viscous effect from fluid. This approach considers floating wind turbine as an integrated coupled system. Two time-domain solvers, SIMA (SIMO/RIFLEX/AERODYN) and FAST are being chosen to analyze the global response of the integrated coupled system under small, moderate and severe sea condition. Results show that second order mean drift force and slow-drift force will drift the floater away along wave propagation direction. At the same time, slow-drift force has larger effect than mean drift force. Also tension of the mooring line at fairlead and tower base loads are increased accordingly in all sea conditions under investigation.



中文翻译:

二阶波激励载荷对海上浮式风力发电机组耦合响应的影响

本文提出了一个浮式海上风力涡轮机(OCWT)OC4 DeepCwind带有半潜式平台在真实海洋环境下的动态性能的综合分析。本文的重点是研究波浪平均漂移力和慢漂移波浪激发载荷(二次传递函数,即QTF)如何影响平台运动,系泊缆索张力和塔基弯矩。二阶电势理论正在用于计算线性和非线性波效应,包括一阶波力,平均漂移力和慢漂移激励载荷。利用莫里森模型来解释流体的粘性作用。这种方法将浮动风力涡轮机视为一个集成的耦合系统。两个时域求解器 选择SIMA(SIMO / RIFLEX / AERODYN)和FAST来分析在小,中,重度海况下集成耦合系统的整体响应。结果表明,二阶平均漂移力和慢漂移力会使浮子沿波传播方向漂移。同时,缓慢漂移力比平均漂移力具有更大的作用。此外,在所研究的所有海况下,系泊缆在导缆绳和塔架基础载荷下的张力也会相应增加。

更新日期:2020-02-04
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