大型风力发电机组主轴载荷分析及疲劳寿命研究
发布时间：2018-11-29 10:41
【摘要】：风力发电机的装机容量逐年增加,装机尺寸逐年增大,也随之带来了成本升高、故障频发等很多问题。风能产品的制造技术也面临着巨大的挑战,整机建模、零部件载荷分析显得尤为重要。本文以2MW风力发电机为例进行整机建模并对其主轴进行载荷特性及疲劳寿命方面的研究。 本文介绍了风力发电机基本工作原理,论述风力发电机气动特性分析理论叶素动量理论,讨论了风轮的切向及轴向诱导因子,得出该因子对风力发电机的尺寸结构参数、空气动力特性与风轮载荷存在的一些影响。 通过专业风力发电机分析软件S4WT建立大型风力发电机整机结构分析模型。根据IEC61400-1标准建立风力发电机主轴载荷分析工况,结合叶素动量理论计算主轴在不同风况及工况下力与力矩载荷,得出风力发电机关键零部件的载荷确定方法,即建立叶片、叶根、轮毂及塔架坐标系,并将各坐标系上载荷叠加可得,得到了风力发电机主轴载荷的动态响应曲线,直观的描述了主轴不同工况以及风况下的载荷特性。 在pro/e中建立主轴三维模型,通过有限元分析软件ANSYS进行网格划分、有限元分析,得到了主轴在不同风速下的应力变化及极限值,得到的应力极限值产生处与现实中主轴疲劳破坏处相吻合。基于线性疲劳累计损伤理论中最典型的理论Palmgren-Miner理论结合风场、主轴材料性能数据进行主轴疲劳寿命估算,并通过实例验证估算方法安全可靠,满足风力发电机主轴20年的设计安全寿命要求。
[Abstract]:The installed capacity of wind turbine increases year by year, and the size of wind turbine increases year by year, which brings a lot of problems, such as higher cost and frequent faults. The manufacturing technology of wind energy products is also facing great challenges. It is very important to model the whole machine and analyze the load of parts. This paper takes 2MW wind turbine as an example to model the whole machine and to study the load characteristics and fatigue life of its spindle. In this paper, the basic working principle of wind turbine is introduced, the theory of blade momentum is discussed, the tangential and axial induction factors of wind turbine are discussed, and the dimension and structure parameters of wind turbine are obtained. Some effects of aerodynamic characteristics and wind wheel loads. The structural analysis model of large scale wind turbine is established by using the professional wind turbine analysis software S4WT. According to IEC61400-1 standard, the load analysis condition of main shaft of wind turbine is established. Combined with the theory of blade momentum, the load and torque of main shaft under different wind conditions and working conditions are calculated, and the method of determining the load of key parts of wind turbine is obtained, that is, the blade is established. The blade root, hub and tower coordinate system can be obtained by superposing the loads on each coordinate system, and the dynamic response curve of the main shaft load of the wind turbine is obtained, and the load characteristics of the main shaft under different working conditions and wind conditions are described intuitively. The 3D model of spindle is established in pro/e. The finite element analysis software ANSYS is used to mesh the spindle. The stress change and limit value of spindle under different wind speed are obtained by finite element analysis. The stress limit values obtained agree with the fatigue failure of the spindle in reality. Based on the Palmgren-Miner theory, which is the most typical theory of linear fatigue cumulative damage theory and wind field, the fatigue life of spindle is estimated by the data of spindle material performance, and the method is proved to be safe and reliable by an example. Meet the design safety life requirements of the main shaft of wind turbine for 20 years.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315
本文编号：2364772
[Abstract]:The installed capacity of wind turbine increases year by year, and the size of wind turbine increases year by year, which brings a lot of problems, such as higher cost and frequent faults. The manufacturing technology of wind energy products is also facing great challenges. It is very important to model the whole machine and analyze the load of parts. This paper takes 2MW wind turbine as an example to model the whole machine and to study the load characteristics and fatigue life of its spindle. In this paper, the basic working principle of wind turbine is introduced, the theory of blade momentum is discussed, the tangential and axial induction factors of wind turbine are discussed, and the dimension and structure parameters of wind turbine are obtained. Some effects of aerodynamic characteristics and wind wheel loads. The structural analysis model of large scale wind turbine is established by using the professional wind turbine analysis software S4WT. According to IEC61400-1 standard, the load analysis condition of main shaft of wind turbine is established. Combined with the theory of blade momentum, the load and torque of main shaft under different wind conditions and working conditions are calculated, and the method of determining the load of key parts of wind turbine is obtained, that is, the blade is established. The blade root, hub and tower coordinate system can be obtained by superposing the loads on each coordinate system, and the dynamic response curve of the main shaft load of the wind turbine is obtained, and the load characteristics of the main shaft under different working conditions and wind conditions are described intuitively. The 3D model of spindle is established in pro/e. The finite element analysis software ANSYS is used to mesh the spindle. The stress change and limit value of spindle under different wind speed are obtained by finite element analysis. The stress limit values obtained agree with the fatigue failure of the spindle in reality. Based on the Palmgren-Miner theory, which is the most typical theory of linear fatigue cumulative damage theory and wind field, the fatigue life of spindle is estimated by the data of spindle material performance, and the method is proved to be safe and reliable by an example. Meet the design safety life requirements of the main shaft of wind turbine for 20 years.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315
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