500米口径球面射电天文望远镜馈源舱结构优化

发布时间：2017-12-31 12:08

本文关键词：500米口径球面射电天文望远镜馈源舱结构优化　出处：《大连海事大学》2012年硕士论文　论文类型：学位论文

【摘要】：500米口径球面射电天文望远镜是目前世界上最大的单口径望远镜,其在工程技术上的突破和创新将保证其在未来20至30年间保持世界一流地位。FAST馈源支撑系统主要功能是承载和驱动馈源在百米尺度大工作空间内运动,实时地达到毫米级高精度定位。 FAST馈源舱结构由四部分组成：STEWART下平台、STEWART上平台、AB轴转环、星型架。其中STEWART上、下平台由六条驱动腿相连构成六轴机器人,实现对安置于STEWART下平台的馈源接收机的精调。本文运用商用有限元软件ANSYS对馈源舱原结构方案进行了校核,以参数化设计语言将上述四部分分块建模,并分别进行了有限元分析,对各部分连接处所对应的节点变形进行了记录和追踪,并提供了四部分结构在各坐标轴方向的变形云图以及位移矢量和云图。将刚度校核后的四部分结构进行组装,建立FAST馈源舱整体结构模型,运用ANSYS后处理模块进行有限元求解。结合优化模块以及截面选择的非连续性,反复迭代对结构进行优化。在优化方案中对STEWART下平台进行了结构概念的重新设计,以满足STEWART六轴机器人六条腿合理、对称地分布,同时在承载9套接收机时受力分布均匀且结构本身对称性良好。对STEWART上平台、AB轴转环以及星型架进行了截面优化,重新选择结构中杆件的截面尺寸,去除了部分冗余杆件,在保证结构刚度以及结构对称性的同时,降低整体结构的重量。将结构优化后的STEWART上、下平台以及AB轴转环三部分进行组装构成DOWN结构,通过DOWN结构的旋转模拟星型架与DOWN结构的相对转动,之后实现DOWN结构与星型架的装配,构成整体模型,通过整体模型的旋转模拟馈源舱整体结构的服役状态,对结构中连接处所对应的节点的变形进行了记录,并提供了整体结构在典型服役环境下的位移矢量和云图。运用ANSYS后处理模块进行模态分析,以分块Block Lanzcos法分别对DOWN结构、星型架结构以及馈源舱整体结构进行了模态分析,分别给出前10阶频率和阵型。
[Abstract]:The 500-meter spherical radio telescope is the largest single aperture telescope in the world. Its breakthrough and innovation in engineering technology will ensure that it will maintain a world-class status in the next 20 to 30 years. The main function of fast feed support system is to carry and drive the feed in a 100-meter scale large workspace. Move. Real-time high-precision positioning at millimeter level. The structure of the FAST feed cabin is composed of four parts, which are composed of four parts. The platform on the platform STEWART is composed of AB axis rotation ring and star frame. Among them, the STEWART. The lower platform is connected by six driving legs to form a six-axis robot. This paper uses commercial finite element software ANSYS to check the original structure of the feed cabin. The above four parts are modeled by parameterized design language, and the finite element analysis is carried out respectively, and the corresponding deformation of each part is recorded and tracked. The deformation cloud map, displacement vector and cloud map of the four-part structure in each axis are provided. The whole structure model of FAST feed cabin is established by assembling the four-part structure after the stiffness check. The ANSYS post-processing module is used to solve the finite element problem, and the optimization module is combined with the discontinuity of section selection. In the optimization scheme, the structure concept of the platform under STEWART is redesigned to satisfy the six legs of STEWART six-axis robot reasonably and symmetrically. At the same time, when carrying 9 sets of receivers, the force distribution is uniform and the symmetry of the structure itself is good. The section optimization of STEWART platform AB axis rotation ring and star frame is carried out. The cross-section size of the members in the structure is re-selected and some redundant members are removed. The stiffness and symmetry of the structure are guaranteed and the weight of the whole structure is reduced at the same time. The DOWN structure is composed of three parts: the optimized STEWART, the lower platform and the AB rotation ring. The relative rotation of the star frame and the DOWN structure is simulated by the rotation of the DOWN structure, and then the assembly of the DOWN structure and the star frame is realized, which constitutes the whole model. Through the rotation of the whole model to simulate the service state of the whole structure of the feed cabin, the deformation of the nodes corresponding to the joint in the structure is recorded. The displacement vector and cloud diagram of the whole structure in typical service environment are provided. Modal analysis is carried out by using ANSYS post-processing module. The modal analysis of the DOWN structure, the star frame structure and the whole structure of the feed cabin is carried out by using the block Block Lanzcos method, and the first 10 order frequencies and the formation patterns are given respectively.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH751

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