海上风机整体结构动力特性分析

Dynamic Characteristics Analysis on Overall Structure of Offshore Wind Turbine

提出一种简化处理桩土相互作用的方法,并基于此针对现有的5MW海装风机结构,建立用于研究的WT5MW海上风机结构,模拟风机上部结构包括机舱、叶片、轮毂等组件,确定风机基础结构的设计工况和相关水文参数,采用FAST软件开展风机荷载计算,并利用SACS建立WT5MW整体结构有限元模型,开展多年平均水位下的WT5MW风机结构动力特性分析。结果表明,WT5MW风机结构的基频为0.321Hz,处于允许频率范围内,与NREL5MW基频基本一致,可印证桩土相互作用简化处理方法的有效性。

A simplified method to deal with pile-soil interaction is presented.In view of the existing NREL 5 MW offshore wind turbine structure,the WT 5 MW offshore wind turbine structure used for the research is established.The superstructures of the wind turbine are simulated,including engine room,blade,hub and other components.The design conditions and relevant hydrological parameters of the wind turbine infrastructure are determined.The wind turbine load calculation is carried out by FAST and the finite element model of the whole structure of WT 5 MW is established by SACS.The dynamic characteristic analysis of WT 5 MW wind turbine structure under the average annual water level is carried out.The results show that the fundamental frequency of the WT 5 MW wind turbine is 0.321 Hz which is within the allowable frequency range and is basically consistent with the fundamental frequency of NREL 5 MW.The effectiveness of simplified treatment method for pile-soil interaction is verified.