三脚架式海上风电支撑结构流固耦合动力分析  

Fluid-structural interaction analysis of supporting structure of a 5 MW tripod offshore wind turbine

作　　者：张力伟[1,2] 李昕[1] Zhang Liwei Li Xin(State key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116026, China Wind Power Research Institute, New United Group, Changzhou 213166, China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116026 [2]新誉集团风电研究院,江苏常州213166

出　　处：《可再生能源》2017年第5期740-746,共7页Renewable Energy Resources

基　　金：国家自然科学基金委创新研究群体基金项目(51121005)

摘　　要：近海固定式风电机组水下支撑结构的体积较大,海水对结构体系的振动特性存在影响。文章以5 MW三脚架式海上风力机为研究对象,建立了考虑桩-土体系及流固耦合作用的整机动力学分析模型;借助有限元软件ANSYS对该结构体系的流固耦合模态进行数值求解;通过低阶固有频率和振型特征,分析了海水对振动模态的影响。在此基础上,运用动力时程法分析了整机在El-Centro波作用下的地震动响应。研究结果表明,在地震作用下,海水附加作用能够显著增大基础侧向位移和桩基弯矩,在进行海上风机设计时,须给予考虑。Fixed offshore wind turbine usually has large size supporting structure underwater and fluid has an influence on the dynamic characteristics of the structure system.The dynamic model of a 5 MW tripod offshore wind turbine considering pile-soil system and fluid-structure interaction （FSI）is established and the structural modes in air and in water are obtained with the help of ANSYS.Through comparisons of the low-order natural frequencies and mode shapes,the influence of sea water on the free vibration characteristics of offshore wind turbine are analyzed.On basis of the above work,seismic responses under excitation of El-Centro wave are calculated by using time-history analysis method,and the results reveal that the dynamic responses such as the lateral displacement of the foundation and the section bending moment of the tubular piles increase substantially under the influence of added-mass and hydrodynamic pressure of sea water,which should be taken into account in designing of offshore wind turbines.

关 键 词：海上风机 流固耦合 固有频率 地震波 时程分析 动水压力 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程] TU312[建筑科学—结构工程]