本文關(guān)鍵詞：500米口徑球面射電天文望遠(yuǎn)鏡饋源艙結(jié)構(gòu)優(yōu)化　出處：《大連海事大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

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【摘要】：500米口徑球面射電天文望遠(yuǎn)鏡是目前世界上最大的單口徑望遠(yuǎn)鏡,其在工程技術(shù)上的突破和創(chuàng)新將保證其在未來(lái)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(dòng)饋源在百米尺度大工作空間內(nèi)運(yùn)動(dòng),實(shí)時(shí)地達(dá)到毫米級(jí)高精度定位。 FAST饋源艙結(jié)構(gòu)由四部分組成：STEWART下平臺(tái)、STEWART上平臺(tái)、AB軸轉(zhuǎn)環(huán)、星型架。其中STEWART上、下平臺(tái)由六條驅(qū)動(dòng)腿相連構(gòu)成六軸機(jī)器人,實(shí)現(xiàn)對(duì)安置于STEWART下平臺(tái)的饋源接收機(jī)的精調(diào)。本文運(yùn)用商用有限元軟件ANSYS對(duì)饋源艙原結(jié)構(gòu)方案進(jìn)行了校核,以參數(shù)化設(shè)計(jì)語(yǔ)言將上述四部分分塊建模,并分別進(jìn)行了有限元分析,對(duì)各部分連接處所對(duì)應(yīng)的節(jié)點(diǎn)變形進(jìn)行了記錄和追蹤,并提供了四部分結(jié)構(gòu)在各坐標(biāo)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(jié)構(gòu)進(jìn)行組裝,建立FAST饋源艙整體結(jié)構(gòu)模型,運(yùn)用ANSYS后處理模塊進(jìn)行有限元求解。結(jié)合優(yōu)化模塊以及截面選擇的非連續(xù)性,反復(fù)迭代對(duì)結(jié)構(gòu)進(jìn)行優(yōu)化。在優(yōu)化方案中對(duì)STEWART下平臺(tái)進(jìn)行了結(jié)構(gòu)概念的重新設(shè)計(jì),以滿足STEWART六軸機(jī)器人六條腿合理、對(duì)稱地分布,同時(shí)在承載9套接收機(jī)時(shí)受力分布均勻且結(jié)構(gòu)本身對(duì)稱性良好。對(duì)STEWART上平臺(tái)、AB軸轉(zhuǎn)環(huán)以及星型架進(jìn)行了截面優(yōu)化,重新選擇結(jié)構(gòu)中桿件的截面尺寸,去除了部分冗余桿件,在保證結(jié)構(gòu)剛度以及結(jié)構(gòu)對(duì)稱性的同時(shí),降低整體結(jié)構(gòu)的重量。 將結(jié)構(gòu)優(yōu)化后的STEWART上、下平臺(tái)以及AB軸轉(zhuǎn)環(huán)三部分進(jìn)行組裝構(gòu)成DOWN結(jié)構(gòu),通過(guò)DOWN結(jié)構(gòu)的旋轉(zhuǎn)模擬星型架與DOWN結(jié)構(gòu)的相對(duì)轉(zhuǎn)動(dòng),之后實(shí)現(xiàn)DOWN結(jié)構(gòu)與星型架的裝配,構(gòu)成整體模型,通過(guò)整體模型的旋轉(zhuǎn)模擬饋源艙整體結(jié)構(gòu)的服役狀態(tài),對(duì)結(jié)構(gòu)中連接處所對(duì)應(yīng)的節(jié)點(diǎn)的變形進(jìn)行了記錄,并提供了整體結(jié)構(gòu)在典型服役環(huán)境下的位移矢量和云圖。運(yùn)用ANSYS后處理模塊進(jìn)行模態(tài)分析,以分塊Block Lanzcos法分別對(duì)DOWN結(jié)構(gòu)、星型架結(jié)構(gòu)以及饋源艙整體結(jié)構(gòu)進(jìn)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(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH751

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