水平轴风力机叶片疲劳载荷的计算分析

FATIGUE LOAD CALCULATION AND ANALYSIS OF THE BLADE OF HORIZONTAL AXIS WIND TURBINE

研究水平轴风力机在随机风载荷作用下结构动力响应的数值分析方法,建立基于Palmgren Miner线性累积损伤理论的等效疲劳寿命估计方法。以叶片为研究对象,利用有限元数值分析方法,求得其在随机风载作用下的位移、速度、加速度及应力等。用雨流计数法统计循环参量,将工作循环下的应力水平等效成对称循环下的疲劳载荷谱。并将疲劳载荷通过FE-SAFE疲劳分析模块分析有限元模型的疲劳特性。以某1.5MW水平轴风力机叶片为例,编制Matlab等效疲劳载荷计算仿真程序,并在ANSYS中分析其疲劳特性。

The numerical analysis method of HAWT structure dynamic response wind loading. And the estimation method of equivalent fatigue life based on the P was investigated under stochastic almgren Miner linear damage rule was set up. Using the finite element numerical analysis method, the fatigue load spectrum of the blade such as the displacements, velocities, accelerations and stress were resolved. Counting the statistics cycle parameters by rain- flow method, the work stress level was transformed into symmetrical cycle fatigue load spectrum. Through FE-SAFE fatigue analysis module, the fatigue properties of the finite element model were analyzed. As an example, the fatigue load and fatigue property of a 1.5MW wind turbine blade was calculated using the Matlab simulation program and ANSYS software.