【作者】 付薇；

【导师】 杜静；

【作者基本信息】 重庆大学 ， 机械设计及理论， 2007， 硕士

【摘要】 风能是一种洁净的可再生能源,在当今能源和环境问题日益受到关注的情况下,利用风能进行发电越来越受到人们的重视,随着科学技术的不断发展,风力发电技术在世界上得到了飞快的发展,越来越多的兆瓦级大型风力发电机组相继建成并投入运行,风电市场前景异常广阔。随着风力发电机装机容量日益增大,机组所受的载荷情况也越来越复杂,从而使得风力机及其零部件的安全问题变得更加突出。为了要确保风力机在其设计寿命内能够正常地运行,首先必须对风力发电机组的关键零部件展开设计研究。轮毂是风力发电机组中的一个重要部件,它形状复杂,轮毂设计的好坏将直接影响到整个机组的正常运行和使用寿命,因此有必要在极限载荷条件下对轮毂进行静态分析和疲劳计算,以确定整个轮毂的应力分布情况,从中找出最危险的部位,为轮毂设计提供可靠的依据。本文课题研究就是在这样的背景下,应某企业的需求,对1.5MW风力发电机组的轮毂进行强度计算分析。本文基于有限元法的基本理论,对1.5MW轮毂进行了以下研究:①基于有限元法的建模理论,利用网格划分软件HyperMesh建立了两种轮毂有限元模型:一种是四面体单元模型,划分简单,可以使用有限元程序自动生成,故使用普遍;另一种是六面体单元模型,由于三维网格具有空间几何实体描述和三维网格的自动生成算法的复杂性,使得三维网格,尤其是六面体网格的划分,具有较大难度,一般只能靠工作人员手动生成。并对两种单元类型的模型进行了细致的分析比较。②对轮毂有限元模型进行极限强度分析和疲劳校核计算,并把计算结果与某企业的2MW轮毂分析数据进行了比较,从而验证了本文所研究方法的正确性,确保了轮毂具有足够的强度和使用寿命。③为了减轻轮毂的重量、降低轮毂的制造成本,本文在强度和疲劳分析的基础上,对轮毂优化设计进行了研究,得到一组优化的轮毂壁厚。因此,本论文对为大型风力发电机组轮毂的分析和自主设计提供科学可靠的依据,对企业解决轮毂安全和寿命的问题具有重要的理论意义和工程实用价值,为提高我国风力发电设备技术水平,降低风力发电成本,提高市场竞争能力,实现具有自主知识产权的国产化风力发电机组奠定坚实的基础。更多还原

【Abstract】 Wind energy is a kind of clean regenerative energy. With more attention paid to energy short and environment pollution, it gains more regard to generate electricity by wind turbine. Wind energy technology has developed rapidly with the science and technology uninterrupted growth. In all over the world, more and more large wind turbine generators have established consecutively and brought into service. The prospect of wind energy marketplace becomes vast extraordinarily. However, the design and business application of wind turbine in our country, especially large-scale megawatt prototypes, have a lot of problems to be solved. In order to maintain over its anticipated service life, and can withstand the assumed loads within the prescribed level of safety and possess a sufficient degree of durability and robustness, it is necessary to design and research on the crucial elements of wind turbine at first.The relatively complex three-dimensional geometry of rotor hub is an important component. The design of hub has direct impact the operation of wind turbine in its anticipated service life. Therefore, it is necessary to calculate static and fatigue analysis under various ultimate loads, which can display the distribution of stress, and find out the most dangerous locations. Under this background, the project is to carry out strength analysis to the crucial elements of 1.5MW wind turbine, which responds to the need of some enterprise.Based on the theory of finite element method, the main contents are following:①According to the modeling principle of finite element method, two finite element models have been established based on its geometric model through simplification processes. One model consists of tetrahedron elements, which has been set simply, and divided mesh grid by automeshing. The other is hexahedron element model. The three-dimensional grid is complicated, especially hexahedron, which has been generated by manual dividing. On the basis of this, two types of model have been carried out meticulous analysis and comparison.②The ultimate strength and fatigue analysis have been researched on finite element model of hub. The result is compared with the data of hub of 2MW wind turbine calculated by some enterprise, which has verified correctness of this method by the main body of paper. This hub has sufficient intensity and life time.③To reduce the cost and weight, the optimum design of the hub has been in progress based on intension analysis, getting a group optimizing parameters of the hub.According to the above, it provides scientific and credible basis to the analysis and self design on the rotor hub of large wind generator, and great theoretical significance and project application to enterprises to solve safety and life problem for hub. In addition, it settles grounded basis for improving technical level of wind generator equipment, reducing cost of wind generation, promoting market competition capacity and implementing domestic wind generator with independent intellectual property rights.更多还原