土与结构相互作用对海上风机TMD减振效果的影响研究

Influence of Soil-Structure Interaction on TMD Vibration Reduction Effect of Offshore Wind Turbines

通过建立考虑土与结构相互作用的海上风机支撑结构三维有限元分析模型,结合泥面处固定连接和不同的地基土性质,研究了风浪荷载联合作用下海上风机TMD的减振效果,分析了土与结构相互作用对TMD减振效果的影响。结果表明,若将泥面处简化为固定连接,会严重低估风机结构的动力响应;土与结构相互作用会放大风机结构的动力响应,且降低TMD的减振效果,与泥面处固定连接相比控制率降低约4%;在其他条件都相同的前提下,风机结构的动力响应随地基土弹性模量的增大而减小,且土体工程性质越好,TMD的减振效果越好。

A three-dimensional finite element analysis model of offshore wind turbine support structure considering the interaction between soil and structure is established to study the vibration reduction effect of offshore wind turbine tuned mass damper(TMD)under the combined action of wind and wave loads and analyze the influence of the interaction between soil and structure on the vibration reduction effect of TMD,in which the fixed connection at the mud surface and different foundation soil properties are considered.The results show that the dynamic response of wind turbine structure will be seriously underestimated if the mud surface is simplified as a fixed connection;the interaction between soil and structure will amplify the dynamic response of wind turbine structure and reduce the vibration reduction effect of TMD,and compared with the fixed connection at the mud surface,the control rate is reduced by about 4%;under the same other conditions,the dynamic response of wind turbine structure decreases with the increase of foundation soil modulus,and the better the soil,the better the vibration reduction effect of TMD.