三脚架式海上风电基础结构基频敏感性研究

FUNDAMENTAL STRUCTURAL FREQUENCY ANALYSIS FOR TRIPOD-TYPE OFFSHORE WIND TURBINE

针对三脚架式海上风电结构,根据其力学特性,构建由风力机、塔架和基础结构3个组成部分相应参数表示的简化结构模型,并通过量纲分析方法给出简化结构无量纲基频的表达式。在此基础上,通过数值模拟,研究无量纲频率对于三脚架基础结构相对质量和刚度的敏感性。并进一步研究三脚架式基础结构具体构件对于整体结构基频的影响。结果显示结构基频对于三脚架基础结构的中间立柱部分最为敏感。

A simplified model termed base-movable model was proposed to represent a tripod-type OWT, which was characterized by minimal number of design parameters of RNA, tower and tripod-type foundation. The normalized fundamental frequency of the simplified model could be a function of 2 dimensionless parameters by conducting a dimensional analysis. The numerical studies in this paper were centered around how the dimensionless parameters affecting the fundamental frequency of OWT. Furthermore, the influence on the fundamental frequency by different members of tripod foundation was also studied. The result indicated that the fundamental frequency is most sensitive to the central column part.