风力发电高塔系统风致随机动力响应分析

Stochastic dynamic analysis of wind turbine systems under wind loads

介绍了一种高精度且高效的随机动力系统分析方法—广义概率密度演化方法。基于广义概率密度演化方法,结合随机脉动风场物理模型和"桨叶-机舱-塔体-基础"一体化有限元模型,分别对1.25MW风力发电高钢塔和钢筋混凝土风力发电高塔进行了风致随机动力响应分析,并将分析结果同确定性动力响应分析结果进行比较。研究表明,随机性对风力发电高塔系统结构风致动力响应分析的影响非常显著。

Wind energy development is an effective way to solve problems such as energy shortage and environmental pollution,so it is very useful to accurately compute the stochastic dynamic response of wind turbine systems under wind loads.Firstly,a new method termed as generalized probability density evolution method（GPDEM） is presented in the paper.The GPDEM has been proved to be of high accuracy and efficiency in most kinds of stochastic analysis of dynamical systems. Associated with the physical model of stochastic wind field and the integrated finite element model consisting of the rotor,the nacelle,the tower and the foundation,it is very hopeful to apply the GPDEM in stochastic dynamic analysis of wind turbine systems.Then,a 1.25 MW wind turbine system subject to wind loads is investigated in detail,and the dynamic responses and the stochastic ones are also compared.The results demonstrate that the randomness of wind velocities places a great influence on the stochastic dynamic analysis of wind turbine systems.