本文關鍵詞：500米口徑球面射電天文望遠鏡饋源艙結構優(yōu)化　出處：《大連海事大學》2012年碩士論文　論文類型：學位論文

  更多相關文章： 饋源艙 結構優(yōu)化 模態(tài)分析 校核

【摘要】：500米口徑球面射電天文望遠鏡是目前世界上最大的單口徑望遠鏡,其在工程技術上的突破和創(chuàng)新將保證其在未來20至30年間保持世界一流地位。FAST饋源支撐系統(tǒng)主要功能是承載和驅(qū)動饋源在百米尺度大工作空間內(nèi)運動,實時地達到毫米級高精度定位。 FAST饋源艙結構由四部分組成：STEWART下平臺、STEWART上平臺、AB軸轉環(huán)、星型架。其中STEWART上、下平臺由六條驅(qū)動腿相連構成六軸機器人,實現(xiàn)對安置于STEWART下平臺的饋源接收機的精調(diào)。本文運用商用有限元軟件ANSYS對饋源艙原結構方案進行了校核,以參數(shù)化設計語言將上述四部分分塊建模,并分別進行了有限元分析,對各部分連接處所對應的節(jié)點變形進行了記錄和追蹤,并提供了四部分結構在各坐標軸方向的變形云圖以及位移矢量和云圖。 將剛度校核后的四部分結構進行組裝,建立FAST饋源艙整體結構模型,運用ANSYS后處理模塊進行有限元求解。結合優(yōu)化模塊以及截面選擇的非連續(xù)性,反復迭代對結構進行優(yōu)化。在優(yōu)化方案中對STEWART下平臺進行了結構概念的重新設計,以滿足STEWART六軸機器人六條腿合理、對稱地分布,同時在承載9套接收機時受力分布均勻且結構本身對稱性良好。對STEWART上平臺、AB軸轉環(huán)以及星型架進行了截面優(yōu)化,重新選擇結構中桿件的截面尺寸,去除了部分冗余桿件,在保證結構剛度以及結構對稱性的同時,降低整體結構的重量。 將結構優(yōu)化后的STEWART上、下平臺以及AB軸轉環(huán)三部分進行組裝構成DOWN結構,通過DOWN結構的旋轉模擬星型架與DOWN結構的相對轉動,之后實現(xiàn)DOWN結構與星型架的裝配,構成整體模型,通過整體模型的旋轉模擬饋源艙整體結構的服役狀態(tài),對結構中連接處所對應的節(jié)點的變形進行了記錄,并提供了整體結構在典型服役環(huán)境下的位移矢量和云圖。運用ANSYS后處理模塊進行模態(tài)分析,以分塊Block Lanzcos法分別對DOWN結構、星型架結構以及饋源艙整體結構進行了模態(tài)分析,分別給出前10階頻率和陣型。
[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.
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH751

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