Analytical formulation for natural frequency of monopile-supported offshore wind turbine: Calibration and application

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures Pub Date : 2025-07-23 DOI:10.1016/j.marstruc.2025.103901

Fangyu Wu , Zhongxuan Yang , Subhamoy Bhattacharya , Rongqiao Xu , Sai Fu

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引用次数: 0

Abstract

The dynamic response of monopile supported offshore wind turbines (OWT) plays a critical role in their structural design optimization. During the design optimization process, various methods, including numerical simulations and closed-form solutions, are used to analyze the free vibration behavior of monopile-supported OWTs. This study introduces an analytical model based on the Rayleigh-Ritz method to derive a fast yet accurate estimation formula for natural frequencies.

Given the increasing deployment of OWTs in deeper waters with complex seabed conditions prone to scouring, as well as the trend toward larger turbine sizes, the calibrated model and Rayleigh-Ritz formula are applied to assess the effects of scouring on natural frequencies across different turbine scales. The study also examines the relationship between the natural frequencies computed using a fixed-base assumption and the effect of foundation flexibility, accounting for variations in ground conditions. Furthermore, the work explores frequency trends across multiple turbines scales and identifies feasible turbine sizes for deployment in four specific seas of China.

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单桩支撑海上风力机固有频率解析公式：校准与应用

单桩支撑海上风力发电机组的动力响应对其结构优化设计具有重要意义。在优化设计过程中，采用数值模拟和闭式解等多种方法对单桩支承的自振特性进行了分析。本文引入基于瑞利-里兹法的解析模型，推导出快速准确的固有频率估计公式。考虑到owt越来越多地部署在更深的水域，且海底条件复杂，容易发生冲刷，以及涡轮机尺寸越来越大的趋势，应用校准模型和瑞利-里兹公式评估了不同涡轮机尺度上冲刷对固有频率的影响。该研究还考察了使用固定基础假设计算的固有频率与基础灵活性的影响之间的关系，考虑了地面条件的变化。此外，该工作还探讨了多个涡轮机规模的频率趋势，并确定了在中国四个特定海域部署的可行涡轮机尺寸。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.