风力发电高塔系统风致动力响应分析  

Dynamic Response Analysis of Wind-excited Wind Turbine Systems

作　　者：贺广零[1,2] 李杰[2] 

机构地区：[1]同济大学力学博士后流动站,上海市200092 [2]同济大学建筑工程系,上海市200092

出　　处：《电力建设》2011年第10期1-9,共9页Electric Power Construction

基　　金：国家自然科学基金委创新研究群体项目(50621062);国家高技术研究发展计划(863计划)项目(2008AA05Z413);中国博士后科学基金项目(20110490702)

摘　　要：风荷载是威胁风力发电高塔系统结构安全的主要外因之一。基于此,首先以典型的1.25MW变桨距风力发电高塔系统为背景,在有限元程序ANSYS开发环境下,建立了风力发电高塔系统"桨叶-机舱-塔体-基础"一体化有限元分析模型。其次,基于随机过程的随机函数描述,结合风速作用于旋转桨叶的物理机制,提出了旋转Fourier谱物理模型。再次,依据随机函数法生成目标场地的风场,进行了风力发电高塔系统一体化模型的风致动力响应分析,对比了风力发电高塔系统的静力计算结果与动力响应计算结果。研究表明:结构的风致动力放大效应显著,在设计过程中必须考虑该效应。同时,风力发电钢塔存在突出的拍振现象,动力响应明显偏大,而钢筋混凝土风力发电塔则不存在该现象。Wind loads are considered to be one of the main harmful factors to threats the structural safety of wind turbine systems. Based on the typical pitch regulated 1.25 MW steel wind turbine system, an integrated finite element model consisting of the rotor, the nacelle, the tower and the foundation is established using the commercial software ANSYS. Then, on the basis of the random function description of stochastic processes, a physical model of the rotational Fourier spectrum is proposed according to the physical mechanism of wind speeds loading on rotating blades. Furthermore, the wind field of the target site is generated based on the random function method, and the wind-excited dynamic response analysis is thereafter done. In order to evaluate the dynamic amplification effect, the dynamic response results are compared with the static ones. The results show that the wind-induced dynamic amplification effect is remarkable, and this effect should be taken into consideration in the structural design phase. Moreover, obvious beat vibrations exist in the dynamic response analysis of steel wind turbine system, while similar phenomenon does not exist for the reinforced concrete wind turbine system.

关 键 词：风力发电钢塔 钢筋混凝土风力发电塔 一体化有限元模型 随机FOURIER谱 旋转Fourier谱 动力放大效应 拍振 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程] TU38[建筑科学—结构工程]