超大型近海风力机海流冲刷下的动力学响应分析  

Dynamic Response Analysis of Super Large Offshore Wind Turbine Under Current Scour

作　　者：师浩东 闫阳天 马璐 李春[1,3] 牛凯伦 SHI Haodong;YAN Yangtian;MA Lu;LI Chun;NIU Kailun(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;China Three Gorges Corporation,Wuhan 430010,China;Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]中国长江三峡集团有限公司,武汉430010 [3]上海市动力工程多相流动与传热重点实验室,上海200093

出　　处：《动力工程学报》2023年第9期1190-1197,1237,共9页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51976131、52006148);上海市“科技创新行动”地方院校能力建设资助项目(19060502200)。

摘　　要：为探究风力机桩周冲刷前、后结构动力学特性的变化,在土-构耦合作用下建立10 MW单桩式海上风力机模型,进行整机模态分析,并分析风浪作用下风力机的动力学响应。结果表明:随着冲刷深度的增加,较之一阶频率,二阶自振频率明显下降,冲刷效应对二阶自振频率影响较大;与未冲刷相比,冲刷深度为1.28D时塔顶位移增大7.8%,桩基位移增大110.5%,与塔架相比,冲刷效应对桩基影响更大;与未冲刷相比,冲刷深度为1.28D时桩基峰值应力增大14.3%,峰值应变能增大6.7%,冲刷效应致使应力和应变能集聚现象更为明显,设计时应充分预估冲刷效应对风力机的影响。To explore the change of structural dynamic characteristics of wind turbine pile before and after scouring,a 10 MW single-pile offshore wind turbine model was established under soil-structure interaction.The modal analysis of the whole machine and the dynamic response analysis of the wind turbine influenced by the wind and wave were carried out.Results show that with the increase of scour depth,compared with the first order frequency,the second order natural frequency decreases significantly,and the erosion effect has a significant impact on the second order natural frequency.Compared with no scouring,the displacement of the tower top increases by 7.8%and the displacement of the pile foundation increases by 110.5%at the scour depth of 1.28D.Compared with the tower,the scouring effect has a greater impact on the pile foundation.Compared with no scouring,when the scour depth is 1.28D,the peak stress of the pile foundation increases by 14.3%and the peak strain energy increases by 6.7%.The scouring effect makes the accumulation of stress and strain energy more obvious.The impact of the scouring effect on the wind turbine should be fully estimated in the design.

关 键 词：局部冲刷 动力学特性 单桩基础 P-Y曲线法 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]