| 一种改进后的海上风机动力特性理论分析方法研究 |
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| 引用本文： | 余璐庆,吕学金,汤旅军,黄玉佩.一种改进后的海上风机动力特性理论分析方法研究[J].西北地震学报,2018,40(2):225-232,251. |
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| 作者姓名： | 余璐庆 吕学金 汤旅军 黄玉佩 |
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| 作者单位： | 中国能源建设集团浙江省电力设计院有限公司;浙江建设职业技术学院;浙江大学建筑工程学院 |
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| 基金项目： | 国家自然科学基金青年科学基金（51209183） |
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| 摘 要： | 海上风机是一种高柔性海洋结构物,其支撑结构的动力响应对风、浪、流等环境因素、风机荷载及基础刚度的影响异常敏感。建立基础-塔架-顶部集中质量为一体的风机简化计算模型,在底部弹性约束条件下考虑水平刚度和转动刚度之间的耦合。基于改进后的计算模型、经典微分方程及其边界条件,通过对方程的求解,系统研究底部基础刚度和顶部竖向轴压等设计参数对结构前四阶自振频率的影响规律。本文研究结论在一定程度上可揭示风机运行过程中因基础刚度变化而引起的支撑结构动力特性变化规律,可为今后实际工程中风机基础、支撑结构的选型及设计提供相关启示。
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| 关 键 词： | 海上风机 支撑结构 动力特性 基础刚度 耦合效应 |
| 收稿时间： | 2017/1/23 0:00:00 |
An Improved Theoretical Analysis Method for the DynamicCharacteristics of Offshore Wind Turbines |
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| YU Luqing,L&#; Xuejin,TANG L&#;jun and HUANG Yupei.An Improved Theoretical Analysis Method for the DynamicCharacteristics of Offshore Wind Turbines[J].Northwestern Seismological Journal,2018,40(2):225-232,251. |
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| Authors: | YU Luqing L&#; Xuejin TANG L&#;jun and HUANG Yupei |
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| Institution: | Zhejiang Electric Power Design Institute Co., Ltd. of China Energy Engineering Group, Hangzhou 310012, Zhejiang, China,Zhejiang College of Construction, Hangzhou 311231, Zhejiang, China,Zhejiang Electric Power Design Institute Co., Ltd. of China Energy Engineering Group, Hangzhou 310012, Zhejiang, China and Zhejiang Electric Power Design Institute Co., Ltd. of China Energy Engineering Group, Hangzhou 310012, Zhejiang, China;College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, Zhejiang, China |
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| Abstract: | In recent years, harvesting offshore wind energy has become a promising option for overcoming the problem of energy supply while still protecting the natural environment. China is rich in offshore wind energy along the east and southeast coastline, so it makes sense to invest in offshore wind farms. With wind turbine construction moving from onshore to offshore and into deeper and deeper waters, high construction standards and maintenance of the foundations and turbine structures are necessary to meet the adverse offshore environment. Therefore, the technological difficulties and costs of installing offshore wind turbines (OWTs) are increasing markedly and are becoming obstacles to the development of offshore wind energy. OWTs are relatively new structures and are meant to produce energy for 25 to 30 years, but we have no records on their long-term performance. The offshore wind turbine is a slender and flexible structure, and its dynamic behavior is strongly affected by environmental loading and the stiffness of its foundation. The first-order natural frequency of an OWT is generally close to the forcing frequencies imposed by environmental loading (wind, waves, and currents) and the onboard machinery. A change in foundation stiffness results in a change in the natural frequency of OWTs; therefore, rational choices regarding OWT foundations and accurate prediction of their long-term performances are very challenging. This paper establishes a simplified wind turbine model comprised of foundation, tower, and top mass. Based on the elastic restrained bottom condition, the coupling effect between the lateral and rotational stiffness is considered. Based on the improved model, differential equations, and boundary conditions, the effect of foundation stiffness and top mass on the structure''s first dynamic response, i.e., its four orders of natural frequency, is studied. The conclusions in this paper can be used to predict the development trend of OWT dynamic behavior based on foundation stiffness variation, and can also guide the design of foundations and support structures in the future. However, rational choices of OWT foundations and accurate prediction of their long-term performances are still very challenging. |
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| Keywords: | offshore wind turbine support structure dynamic properties foundation stiffness coupling effect |
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