海上风电机组自振频率数值模拟与影响因素研究

蒋林峰; 吴腾; 吴勇

doi:doi:10.19912/j.0254-0096.tynxb.2024-0961

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海上风电机组自振频率数值模拟与影响因素研究

更新时间：2025-12-17

- 海上风电机组自振频率数值模拟与影响因素研究
- Issue 10, Pages: 596-604(2025)
- 作者机构：
- 作者简介：
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- DOI：doi:10.19912/j.0254-0096.tynxb.2024-0961
  CLC： M315
- Published Online：31 October 2025，
  
  Published：31 October 2025
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蒋林峰, 吴腾, 吴勇. 海上风电机组自振频率数值模拟与影响因素研究[J]. 2025, (10): 596-604.
DOI：

蒋林峰, 吴腾, 吴勇. 海上风电机组自振频率数值模拟与影响因素研究[J]. 2025, (10): 596-604. DOI： doi:10.19912/j.0254-0096.tynxb.2024-0961.

摘要

基于江苏省近海某风电场的4 MW海上风电机组

开展野外数据监测和分析。通过有限元软件建立风电机组-塔筒-基础一体化模型

将其与基础-塔筒模型进行对比

并根据该工程的长期监测数据

验证了一体化模型的可靠性。最后基于一体化模型分析结构尺寸、地基条件、风电机组运行状态对结构自振频率的影响。结果表明：一体化模型求得的风电机组自振频率相较简化模型更接近实际监测值

简化上部结构会导致自振频率的计算值偏大。结构自振频率监测结果基本不受监测高程影响

可通过不同高程处监测的自振频率是否一致来判断风电机组的运行状况。随着基础埋深、桩径、土体弹性模量和内摩擦角的增大

结构的自振频率变大。随着塔筒长度的增大

结构的自振频率呈线性降低

随着塔筒壁厚的增加

结构自振频率呈凸抛物线型增加。桩土间的摩擦系数改变对结构的自振频率基本无影响。风电机组运行时会增大结构的低阶自振频率

且对前两阶的自振频率影响最大。

Abstract

Field data monitoring and analysis were carried out for a 4 MW offshore wind turbine at a nearshore wind farm in Jiangsu Province. An integrated model of the wind turbine-tower-foundation was established by finite element software and compared with the base-tower model. The models’ reliability was verified based on long-term monitoring data for the project. The effects of structural dimensions

foundation conditions

and wind turbine operating states on the natural frequency of the structure were analyzed based on the integrated model. The results show that the natural frequency of the wind turbine obtained from the integrated model is closer to the actual monitoring values compared to a simplified model

and simplifying the upper wind turbine structure leads to an overestimation of the natural frequency. The monitoring results of the natural frequency of the structure are not significantly affected by the monitoring elevation and can be used to assess the wind turbine's operational status based on the consistency of natural frequencies at different elevations. As the foundation embedment depth

pile diameter

soil elastic modulus

and internal friction angle increase

the natural frequency of the structure also increases. With an increase in the tower height

the natural frequency of the structure linearly decreases

and an increase in the tower wall thickness leads to a parabolic increase in the natural frequency of the structure. Changes in the friction coefficient between piles and soil have minimal impact on the natural frequency of the structure. Wind turbine operation increases the low-order natural frequencies of the structure

with the most significant impact on the first two natural frequencies.

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