【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。更多还原

【Abstract】 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.更多还原