考虑预应力和地基刚度的大型风力发电机组钢——混塔筒结构模态分析  

Modal Analysis on Steel-Concrete Tower Tube Structure of Large Wind Turbine Considering Prestress and Foundation Stiffness

作　　者：向际超 陈小军 刘欣 刘婷 XIANG Jichao;CHEN Xiaojun;LIU Xin;LIU Ting(Harbin Electric Corporation Wind Power Co.,Ltd.,Xiangtan 411102,China)

机构地区：[1]哈电风能有限公司,湖南湘潭411102

出　　处：《工业技术创新》2023年第3期79-88,共10页Industrial Technology Innovation

摘　　要：立足有限元基本理论,利用ANSYS有限元软件构建大型风力发电机组钢—混塔筒模型,开展模态分析,考察预应力和地基刚度对钢—混塔筒结构模态频率的影响。研究发现:当地基刚度由80GNm/rad增大到240GNm/rad时,钢—混塔筒结构前三阶模态频率的增大幅度分别是10.680%、20.230%和7.546%,增幅较大,不容忽视;钢—混塔筒结构第一阶模态频率(自振基频)在风力发电机组设计中是一个非常重要的设计参数,且受预应力钢筋影响较大,施加预应力比不施加预应力时增大20%以上;钢—混塔筒结构第二、三阶模态频率受到预应力影响较小,仅为1.5%左右,在实际设计生产过程中可不予考虑。Standing on the basic theory of finite element method,the steel-concrete towertube model of large wind turbine was constructed by ANSYS finite element software,and modal analysis was carried out to investigate the influence of prestress and foundation stiffness on the modal frequency of steel-concrete tower tube structure.Findings:When the foundation stiffness increases from 80 GNm/rad to 240 GNm/rad,the first three modal frequencies of the steel-concrete tower tube structure increase by 10.680%,20.230%and 7.546%respectively,which cannot be ignored.The first modal frequency(natural frequency)of steelconcrete tower tube structure is a very important design parameter in the design of wind turbine,and it is greatly influenced by prestressed steel bars,and the prestress is increased by more than 20%compared with that without prestress.The second and third modal frequencies of steel-concrete tower tube structure are less affected by prestress(only about 1.5%),which can be ignored in the actual design and production process.

关 键 词：钢—混塔筒 预应力 模态分析 模态频率 地基刚度 

分 类 号：TM315[电气工程—电机]