Impact of hull flexibility on the global performance of a 15 MW concrete-spar floating offshore wind turbine

IF 4 2区工程技术 Q1 ENGINEERING, CIVIL Marine Structures Pub Date : 2024-11-25 DOI:10.1016/j.marstruc.2024.103724

Ikjae Lee , Moohyun Kim , Chungkuk Jin

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Abstract

In this study, we investigated the impact of the hull flexibility of 15MW spar-type FOWT (floating offshore wind turbine) on the global dynamics/performance analysis. Until recently, the rigid hull (floating foundation) model with flexible tower and RNA (rotor-nacelle assembly) has been used as industry standard procedure in the global performance analysis of FOWTs. Since the FOWT size continues to increase beyond 20MW, there has been increasing concern of the effect of hull flexibility on its global performance. The present study is intended to provide representative insights on this subject. Global performance analysis of the 15MW WindCrete spar is examined based on the conventional hull-rigid and the DMB (discrete-module-beam) models including hull flexibility. Coupled aero-hydro-servo-elastic-mooring dynamic simulations were carried out with the rigid-hull and DMB (discrete-module-beam) models under various combinations of irregular waves, sheared currents, and full-field turbulent winds. The lowest fore-aft bending-mode natural frequency is shifted toward lower frequency from 0.52 to 0.41 Hz after including hull flexibility. Platform rigid 6-DOF (degree-of-freedom) motions and mooring tensions by the DMB model are little changed but nacelle horizontal accelerations and tower-base bending moments may be appreciably increased compared to the rigid-hull model.

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船体灵活性对 15 兆瓦混凝土支柱浮式海上风力涡轮机总体性能的影响

在本研究中，我们探讨了 15MW spar 型 FOWT（浮式海上风力涡轮机）船体柔性对全局动态/性能分析的影响。直到最近，带有柔性塔架和 RNA（转子-机舱组件）的刚性船体（浮动基础）模型一直被用作 FOWT 全局性能分析的行业标准程序。随着 FOWT 规模不断扩大，超过 20MW，人们越来越关注船体柔性对其总体性能的影响。本研究旨在就此问题提供有代表性的见解。根据传统的船体刚性模型和包括船体柔性在内的 DMB（离散模块梁）模型，对 15MW WindCrete spar 进行了全局性能分析。在不规则波浪、剪切流和全场湍流风的不同组合下，使用刚性船体和 DMB（离散模块梁）模型进行了航空-水力-伺服-弹性-锚泊耦合动态模拟。将船体柔性考虑在内后，最低的前后弯曲模式固有频率从 0.52 Hz 降至 0.41 Hz。与刚性船体模型相比，DMB 模型的平台刚性 6-DOF（自由度）运动和系泊张力变化不大，但机舱水平加速度和塔基弯矩可能会明显增加。

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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.