中文摘要：

载荷是导致失效直接原因,是影响产品可靠性的重要因素,风电装备在服役过程中经历的载荷-时间历程及其不确定性有明显的特点.由于服役方式的特殊性,一个风力发电厂中安装在不同位置的发电装备的服役载荷历程会有明显的差别.从风力发电机服役地域位置和时间两个方面描述风力发电机载荷历程的概率特性,并以此为基础,基于全概率计算原理研究风力发电机传动系统及其零部件疲劳可靠性分析与建模方法.内容包括复杂载荷历程不确定性表征方法、随机变幅载荷历程下疲劳累积损伤与等效循环应力计算方法、根据应力分布和条件寿命分布计算疲劳可靠度的方法,以及根据多级小样本疲劳寿命试验确定不同循环应力水平下疲劳寿命分布参数的方法.

英文摘要：

Load is the most direct factor to cause failure and affect product reliability.The load history that a wind turbine experienced has some special characteristic.Owing to the special service mode,the every wind turbines in a wind farm will experience different load histories.The probabilistic property of wind turbine load history is described in two aspects as the every turbine＇s service location and service time.Based on such description,fatiguereliability analysis and modeling of wind turbine gearbox and its components are performed by means of the total probability principle.As the essential issues to develop fatigue reliability model and perform reliability evaluation,the way to characterize load history uncertainty,the methods to accumulate the fatigue damage under variable amplitude load history and calculate the equivalent stress amplitude,the way to develop fatigue reliability model based on stress distribution and life distribution condition to stress,as well as the technique to obtain fatigue life distribution parameters through multi-level small sample fatigue life experiment are introduced.