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2014 年:10月

摘要：首先，建立三维粘弹性人工边界和固定边界的地基-基础-风力发电机塔筒相互作用的有限元模型。然后，编制程序模拟了以Davenport谱为目标谱的脉动风场，并对其加以验证。最后，通过实测数据与数值结果的比较，验证了本文所用数值模型的准确性，分析了不同边界条件下风机结构、地基的自振特性进而对风振反应进行时域计算和频域内的功率谱分析，并考察了不同边界条件下整个结构体系的响应情况。数值与理论分析结果表明：（1）澄清和解释了风振响应谱峰的物理意义；（2）对于顺风向的振动，筒型基础内外地基土的振动情况基本相同；对于竖向振动，相对于筒外土，由于上部结构的压载及筒型基础的“环箍效应”筒内土的振动很小；（3）两种边界条件下塔筒顶端的响应几乎完全一致；采用粘弹性人工边界的地基，地基的振动频率明显减小。此外，还给出了可供工程分析的相关建议。
关键词：粘弹性人工边界；风力发电；塔筒-基础-地基；风荷载；响应功率谱
中图分类号：P315.9;U442   文献标识码：A     文章编号：
作者简介：柳国环，男，副教授，博士
通讯作者：柳国环，liu_guohuan@sina.com. Abstract： Firstly, the coupling models of soil-foundation-wind turbine tower with visco-elastic artificial boundary and fixed boundary were established. Then Davenport spectrum which was verified was composited to simulate the fluctuating wind load. At last the accuracy of numerical model was verified by comparing with measured data, and the analysis of the natural vibration characteristics of wind turbine structure and soil with different boundaries was done. And wind-induced vibration response in time domain and power spectrum in frequency domain was analyzed. Different responses of the entire system between visco-elastic artificial boundary and fixed boundary were further studied. Analysis results show that: (1) the physical meaning of the spectral peaks of wind-induced response is clarified and explained; (2) the along-wind vibration of soil inside bucket is almost the same as the vibration of soil outside; the vertical vibration of soil inside of bucket is much smaller than the vibration outside because of the above ballast and cyclo-hoop effect; (3) the response at tower tip has no difference between the model using different boundaries, and the vibration frequency of the soil is much smaller in the model of visco-elastic artificial boundary than the model of fixed boundary. In addition, the recommendations for engineering application are proposed.
Key words： visco-elastic artificial boundary; wind turbine; soil-foundation-wind turbine tower; wind load; power spectrum density

引言
结语
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