Fatigue life evaluation of pinion gears for the reliability of pitch systems in wind turbines
Fatigue life evaluation of pinion gears for the reliability of pitch systems in wind turbines
复制标题
小齿轮的疲劳寿命评估以保证风力涡轮机变桨系统的可靠性
DOI：
10.1007/s12206-017-0126-0
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Soon
中科院分区：
文献类型：
--
作者：
Si;Yong;Dong;Jungchul Choi;Soon
环境友好型能源行业的最新发展促使许多研究人员将重点放在风力涡轮机上。风力发电技术的进步符合上个世纪的发展趋势。由风力涡轮机组成的变桨系统故障率很高。然而，沥青系统的疲劳寿命还没有得到充分的研究。变桨距系统由电机、变速箱和小齿轮组成，对风电机组的发电效率有很大影响。为了提高变桨系统的耐久性，本文对小齿轮进行了疲劳寿命分析。旋转的频繁变化是运行中的变桨系统所特有的。当反转时存在冲击载荷时，由冲击载荷产生的应力是评估小齿轮疲劳寿命时要考虑的主要因素。通过有限元模拟确定了齿轮齿面的应力历史。根据Goodman关系和Miner准则，通过雨流循环计数计算累积损伤分数。因此，我们提出了一种考虑冲击载荷影响的小齿轮疲劳寿命评估方法。为保证风力机在冲击载荷作用下的可靠性，需要对变桨距系统进行保守设计。
The recent development in the eco-friendly energy industry has motivated many researchers to focus on wind turbines. The advancement of wind turbine technology is in accordance with the trends in the last century. Pitch systems, which comprise wind turbines, have a high failure rate. However, the fatigue life of pitch systems has not been sufficiently studied. A pitch system, which greatly affects the power generation efficiency of a wind turbine, consists of a motor, a gearbox, and a pinion. In this work, a fatigue life analysis of a pinion is performed to improve the durability of pitch systems. Frequent changes in rotation are unique to a pitch system in operation. When an impact load exists at an inverse turn, the stress generated from the impact load is the dominant factor to consider in evaluating the fatigue life of a pinion. The stress history at the gear tooth is determined through a finite element simulation. The cumulative damage fraction is calculated via rainflow cycle counting on the basis of the Goodman relation and Miner’s rule. Therefore, we propose a method for evaluating the fatigue life of a pinion, which considers the effect of an impact load. A conservative design of pitch systems is needed to ensure the reliability of wind turbines under an impact load.