海上风机多桩式支撑结构动力学特性

Dynamic Characteristics of Offshore Wind Turbine Multi-pile Support Structure

为获取多桩式支撑结构动力学特性,以某型3 MW海上风机四桩式支撑结构为研究对象,建立考虑桩土相互作用的支撑结构有限元模型,开展多桩式支撑结构动力学分析。计算支撑结构前6阶固有频率和振型并进行共振复核,结果表明:支撑结构在工作中不会发生共振。分析关键设计参数对支撑结构1阶固有频率的影响规律,结果表明:1阶固有频率随塔顶质量、塔筒高度的增大而减少,随基础结构各构件直径和壁厚的增大而增加;设计参数在±5%变化范围内,塔筒高度变化对1阶固有频率影响最大,水平横撑直径和壁厚变化对1阶固有频率几乎无影响。

In order to obtain the dynamic characteristics of multi-pile supported structure,with a 3 MW offshore wind turbine the four-pile support structure as the research object,the finite element model of supporting structure considering pile-soil interaction is established,and the dynamic analysis of the multi-pile supporting structure is carried out.The first six natural frequency and vibration shape of the wind turbine support structure are calculated,and their resonance is checked.Analysis results show that the supporting structure will not resonate in operation.The analysis results of the influence law between the key design parameters and the first order model frequency of the supporting structure show that the first order modal frequency of the support structure decreases with the increase the top mass of the wind turbine tower and the tower height,and increase with the increase the diameter and thickness of the foundation structure.In the range of±5%,the change of tower height has the greatest impact on the first order modal frequency,and the change of horizontal brace diameter and thickness has little impact on the first order modal frequency.