基于有限元的塔式起重机疲劳研究

发布时间：2018-05-25 15:32

本文选题：塔身结构 + 有限元　；参考：《大连理工大学》2013年硕士论文

【摘要】：本文运用有限元分析获得塔身典型工况下的应力分布及应力集中情况,找出疲劳危险部位；将有限元软件ANSYS与三维软件ProE中的模态中性文件导入动力学仿真软件ADAMS中,并利用ADAMS进行仿真获得塔身危险部位的载荷—时间历程曲线及数据,结合调研工况比例,进行扩展获得载荷谱；查看材料疲劳试验的S-N曲线,并通过修正其他影响参数,得到修正S-N曲线；最终运用线性疲劳累积损伤理论Miner计算得出塔身寿命。论文的主要工作如下： 1)简述大型塔机发展历程以及疲劳理论发展方向,给出了疲劳分析法的步骤—流程图 2)运用有限元分析软件ANSYS对塔式起重机塔身结构进行壳单元建模,并进行典型工况分析,得出应力分布云图,找到应力集中及局部大应力等危险点位置。 3)根据塔式起重机的工作特点,进行ADAMS动力学仿真,在四种典型工况下,得到典型工况对整机性能,尤其塔身的动态性能曲线,并获得载荷—时间历程曲线及数据,结合四种工况的比例,扩展形成最终的载荷谱。 4)选用合适的疲劳分析理论,结合载荷谱及材料性能曲线(修正S-N曲线)进行塔机疲劳寿命计算,通过有限元计算结果和疲劳分析计算结果研究塔机结构的起重能力与抗疲劳能力。 5)研究不同腹杆布置形式对塔身结构疲劳的影响,选用最常用的几种布置形式：N字型、K字型、X字型塔身结构,并根据步骤4中的分析结果,进行疲劳寿命比较。
[Abstract]:In this paper, the stress distribution and stress concentration under typical working conditions of tower body are obtained by finite element analysis, and the fatigue dangerous position is found, and the modal neutral files of finite element software ANSYS and three-dimensional software ProE are imported into the dynamic simulation software ADAMS. The load-time history curve and data of dangerous parts of tower body are obtained by ADAMS simulation, and the load spectrum is obtained by expanding the load spectrum in combination with the proportion of investigation conditions, the S-N curve of material fatigue test is checked, and other influencing parameters are corrected. The modified S-N curve is obtained, and finally the tower life is calculated by linear fatigue cumulative damage theory (Miner). The main work of the thesis is as follows: 1) A brief description of the development of large tower cranes and the development direction of fatigue theory are given, and the steps of fatigue analysis are given. 2) finite element analysis software ANSYS is used to model the tower structure of tower crane, and the typical working condition is analyzed, and the stress distribution cloud diagram is obtained, and the dangerous points such as stress concentration and local large stress are found. Combined with the ratio of four working conditions, the final load spectrum is formed by expansion. 4) selecting appropriate fatigue analysis theory, combining load spectrum and material performance curve (modified S-N curve) to calculate the fatigue life of tower crane. The lifting capacity and fatigue resistance of tower crane are studied by finite element method and fatigue analysis.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TH213.3

【参考文献】