MW级风电机组基础环结构分析与优化设计

发布时间：2018-05-03 08:24

本文选题：基础环 + 法兰　；参考：《重庆大学》2014年硕士论文

【摘要】：随着风力发电机组不断向大功率化方向发展，塔架底部的载荷逐渐的增大，基础环作为连接塔架与地基的关键部件，结构强度和可靠性直接影响塔架的安全。论文对基础环的静强度，焊缝疲劳、孔疲劳以及连接螺栓疲劳进行了分析，同时对连接法兰的强度进行分析计算，验证了基础环结构的安全性。论文的研究方法为风力发电机组基础环结构的设计与校核提供了依据，具有工程实用价值。论文的主要研究内容如下： ①根据德国船级社Germanisher Lloyd(GL)规范和欧洲Eurocode3标准，采用工程计算和有限元方法进行了结构强度校核。 ②运用疲劳分析理论，，对基础环上的焊缝，加强筋孔，连接螺栓进行了疲劳寿命分析。研究了连接螺栓工作应力与外载荷之间的关系，修正了连接螺栓的S-N曲线，为基础环结构中连接螺栓的疲劳寿命分析提供一种有效可行的方法。 ③对基础环结构的L型法兰连接结构进行了分析。基于Petersen理论的三种失效模式，分析了法兰连接结构的承载能力，并运用有限元方法进行验证，考虑了几种对法兰强度的影响因素，最后对与地基相连的T型法兰进行了尺寸的校核。 ④进行了基础环的优化设计。采用自由形状优化的技术，应用Hyperworks软件的Optistruct模块对基础环加强筋孔型进行了优化设计，为基础环设计提供了依据。
[Abstract]:With the development of wind turbine towards high power, the load at the bottom of the tower increases gradually. The foundation ring is the key component to connect the tower with the foundation. The strength and reliability of the structure directly affect the safety of the tower. The static strength, weld fatigue, hole fatigue and connection bolt fatigue of the foundation ring are analyzed in this paper. The strength of the connecting flange is analyzed and calculated to verify the safety of the foundation ring structure. The research method of this paper provides the basis for the design and checking of wind turbine foundation ring structure, and has practical value in engineering. The main contents of this thesis are as follows: According to the code of German Classification Society (Germanisher) and European Standard (Eurocode3), the structural strength is checked by engineering calculation and finite element method. Using fatigue analysis theory, the fatigue life of weld, reinforcing reinforcement hole and connecting bolt on foundation girth is analyzed. The relationship between the working stress and the external load of the connection bolt is studied. The S-N curve of the connection bolt is corrected, which provides an effective and feasible method for the fatigue life analysis of the connection bolt in the foundation ring structure. 3. The L-type flange connection structure of foundation ring structure is analyzed. Based on the three failure modes of Petersen theory, the bearing capacity of flange connection structure is analyzed, and the finite element method is used to verify it, and several factors affecting the flange strength are considered. Finally, the size of T flange connected to the foundation is checked. 4 the optimization design of foundation ring is carried out. By using the technology of free shape optimization and the Optistruct module of Hyperworks software, the optimization design of the foundation ring reinforced reinforcement pass is carried out, which provides the basis for the foundation ring design.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM315

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