Modelling of foundation damping in time-domain analysis of monopile supported offshore wind turbine structures

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL Marine Structures Pub Date : 2024-07-08 DOI:10.1016/j.marstruc.2024.103672

Peng Guo , Haowei Ling , Youhu Zhang , Tongyu Di

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Abstract

Foundation damping holds large potential for design optimisations of monopile-supported offshore wind turbine structures. However, the contribution of foundation damping is not well understood, in part due to lack of suitable method for incorporating foundation damping in the time-domain analysis of wind turbine structures. This paper presents a practical approach for this purpose in which a dashpot is attached in parallel to each p-y spring along the monopile. In this way, the distributed soil-pile interaction stiffness and damping are accurately modelled. To demonstrate the validity of the proposed approach, a case study exploring the influence of foundation damping on the dynamic response of an IEA 15 MW reference turbine founded on monopile is carried out. The results demonstrate that the foundation damping has relatively limited impact on the overall dynamic response and fatigue loads in power production states. However, inclusion of foundation damping is shown to significantly reduce the structural response after emergency shutdown and under parked conditions. The findings of the case study show promising potential for wind turbine structure design optimization through consideration of foundation damping.

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单桩支撑海上风力涡轮机结构时域分析中的地基阻尼建模

地基阻尼对单桩支撑海上风力涡轮机结构的设计优化具有巨大潜力。然而，人们对地基阻尼的贡献还不甚了解，部分原因是缺乏将地基阻尼纳入风力涡轮机结构时域分析的合适方法。本文为此提出了一种实用的方法，即在单桩的每个 p-y 弹簧上平行安装一个仪表盘。这样，分布式土壤-桩相互作用的刚度和阻尼就得到了精确的模拟。为了证明所提方法的有效性，我们进行了一项案例研究，探讨地基阻尼对基于单桩的 IEA 15 兆瓦参考水轮机动态响应的影响。结果表明，在发电状态下，地基阻尼对整体动态响应和疲劳载荷的影响相对有限。然而，在紧急停机后和停机条件下，加入地基阻尼可显著降低结构响应。案例研究的结果表明，通过考虑地基阻尼，风力涡轮机结构设计优化大有可为。

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来源期刊

Marine Structures 工程技术-工程：海洋

CiteScore

8.70

自引率

7.70%

发文量

157

审稿时长

6.4 months

期刊介绍： This journal aims to provide a medium for presentation and discussion of the latest developments in research, design, fabrication and in-service experience relating to marine structures, i.e., all structures of steel, concrete, light alloy or composite construction having an interface with the sea, including ships, fixed and mobile offshore platforms, submarine and submersibles, pipelines, subsea systems for shallow and deep ocean operations and coastal structures such as piers.