提出不确定风载下风力机叶片疲劳累积损伤计算方法。基于风场实测数据,应用最大似然估计法采用多种分布函数对其进行拟合和效果评价,探究不确定风载下循环载荷的表征方法。以风速区间为基本单位,考虑叶片受到的非比例多轴应力作用,采用多轴疲劳累积损伤理论,研究风速实测周期内的疲劳累积损伤计算方法;结合风速区间分布概率,推导出叶片长期疲劳累积损伤计算模型。工程实例表明：该方法能够得到较为准确的叶片服役时长疲劳累积损伤。
Abstract
A calculation method for fatigue cumulative damage of wind turbine blades under uncertain wind load is proposed in this paper. Based on the measured wind field data, the maximum likelihood estimation method is used to fit and evaluate the effectiveness of various distribution functions, and the characterization method of cyclic load under uncertain wind load is explored. Taking the wind speed interval as the basic unit and considering the non-proportional multi-axial stress on the blades, the multi-axial fatigue cumulative damage theory is adopted to study the calculation method of fatigue cumulative damage during the measured period of wind speed. Combined with the distribution probability of the wind speed interval, the calculation model of long-term fatigue cumulative damage of blade is derived. Engineering examples show that this method can provide more accurate estimates of fatigue cumulative damage during the blade’s service life.
关键词
疲劳累积损伤 /
分布概率 /
风力机叶片 /
不确定风载 /
多轴应力
Key words
fatigue damage /
probability distributions /
wind turbine blades /
uncertain wind load /
multiaxial stress
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基金
国家自然科学基金（52365034,52165035）; 内蒙古自治区直属高校基本科研业务费项目（JY20220080）
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