本文選題：TMT + 三鏡��； 參考：《中國科學(xué)院研究生院（長春光學(xué)精密機(jī)械與物理研究所）》2012年碩士論文

【摘要】：隨著人類對(duì)宇宙進(jìn)行的探索不斷地深入,對(duì)天文望遠(yuǎn)鏡的口徑的需求也越來越大,三十米望遠(yuǎn)鏡(TMT)代表了當(dāng)代天文望遠(yuǎn)鏡制造領(lǐng)域的最前沿,而鏡子的面形精度是影響望遠(yuǎn)鏡成像質(zhì)量的關(guān)鍵因素之一,本文正是基于TMT的三鏡進(jìn)行了鏡子支撐結(jié)構(gòu)的設(shè)計(jì)與研究,以達(dá)到要求的面形精度。 通過查閱文獻(xiàn)資料,對(duì)國內(nèi)外大口徑地基望遠(yuǎn)鏡的發(fā)展和現(xiàn)狀進(jìn)行了調(diào)研和總結(jié)；研究了鏡子支撐的基礎(chǔ)理論,對(duì)各種底支撐和側(cè)支撐結(jié)構(gòu)形式進(jìn)行了歸納和總結(jié)；闡述了有限元分析的基本原理,主要對(duì)有限元靜力學(xué)分析和有限元模態(tài)分析進(jìn)行了學(xué)習(xí)和研究。 根據(jù)TMT三鏡的情況,底支撐選用18點(diǎn)兩級(jí)whiffle tree被動(dòng)支撐形式,利用有限元軟件Ansys優(yōu)化分析出18個(gè)支撐點(diǎn)的最佳支撐位置,初步設(shè)計(jì)出的底支撐結(jié)構(gòu),然后利用有限元軟件MSC.Patran/Nastran進(jìn)行有限元建模和分析。根據(jù)分析的結(jié)果對(duì)所設(shè)計(jì)的支撐結(jié)構(gòu)進(jìn)行修正,消除了由結(jié)構(gòu)不對(duì)稱引入的鏡面不對(duì)稱變形的影響,最終鏡面的RMS值為99.7nm,符合設(shè)計(jì)要求；同時(shí)還設(shè)計(jì)了另一種半主動(dòng)式底支撐結(jié)構(gòu),同樣符合鏡面的面形精度要求。 通過研究和分析發(fā)現(xiàn),對(duì)于TMT這種實(shí)心平面鏡來說,側(cè)支撐點(diǎn)的位置和數(shù)量對(duì)其面形的影響不大,只在鏡子邊緣的支撐點(diǎn)附近有影響。借鑒底支撐的設(shè)計(jì)經(jīng)驗(yàn),側(cè)支撐仍然采用whiffle tree結(jié)構(gòu),共有12個(gè)支撐點(diǎn),經(jīng)過有限元分析和改正,最終在側(cè)支撐的作用下鏡面的RMS值達(dá)到了14.1nm,滿足設(shè)計(jì)要求。最后分析了底支撐和側(cè)支撐綜合作用下的面形,滿足設(shè)計(jì)要求。
[Abstract]:As mankind's exploration of the universe continues to deepen, the demand for the caliber of astronomical telescopes is growing, and the 30-meter telescope (TMTT) represents the most advanced field in the manufacture of contemporary astronomical telescopes. The mirror shape accuracy is one of the key factors that affect the imaging quality of the telescope. In this paper, the design and research of the mirror supporting structure based on TMT are carried out in order to achieve the required surface shape accuracy. The development and current situation of large caliber ground-based telescopes at home and abroad are investigated and summarized, the basic theory of mirror bracing is studied, and various forms of bottom and side bracing structures are summarized and summarized. The basic principle of finite element analysis (FEM) is expounded, and the finite element statics analysis and finite element modal analysis are studied. According to the condition of TMT three mirrors, 18 points two-stage whiffle tree passive support is used in the bottom support. The optimal support position of 18 support points is optimized by using the finite element software Ansys, and the primary design of the bottom support structure is obtained. Then the finite element modeling and analysis are carried out by using finite element software MSC.Patran/Nastran. According to the results of the analysis, the designed bracing structure is modified to eliminate the influence of the asymmetric deformation of the mirror surface introduced by the structural asymmetry. The final RMS value of the mirror surface is 99.7 nm, which conforms to the design requirements. At the same time, another semi-active bottom support structure is designed, which also meets the precision requirement of mirror surface. Through research and analysis, it is found that the position and number of side support points have little effect on the surface shape of TMT solid plane mirror, but only near the supporting point of the mirror edge. For reference to the design experience of the bottom bracing, the side bracing still adopts whiffle tree structure, which has 12 supporting points. Through finite element analysis and correction, the RMS value of the mirror surface under the action of the side brace finally reaches 14.1 nm, which meets the design requirements. Finally, the surface shape under the combined action of bottom bracing and side bracing is analyzed to meet the design requirements.
【學(xué)位授予單位】：中國科學(xué)院研究生院（長春光學(xué)精密機(jī)械與物理研究所）
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH751

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王忠素;翟巖;梅貴;江帆;程志峰;;空間光學(xué)遙感器反射鏡柔性支撐的設(shè)計(jì)[J];光學(xué)精密工程;2010年08期

2 周超;楊洪波;吳小霞;張景旭;;地基大口徑望遠(yuǎn)鏡結(jié)構(gòu)的性能分析[J];光學(xué)精密工程;2011年01期

3 陳夫林;張景旭;吳小霞;范磊;;620mm薄鏡面的主動(dòng)支撐結(jié)構(gòu)及面形校正[J];光學(xué)精密工程;2011年05期

4 李志來;徐宏;;長條形空間反射鏡及其支撐結(jié)構(gòu)設(shè)計(jì)[J];光學(xué)精密工程;2011年05期

5 辛宏偉;關(guān)英俊;李景林;楊利偉;董得義;張學(xué)軍;;大孔徑長條反射鏡支撐結(jié)構(gòu)的設(shè)計(jì)[J];光學(xué)精密工程;2011年07期

6 王富國;楊飛;陳寶剛;李延偉;;大口徑主焦點(diǎn)式光學(xué)系統(tǒng)輕量化結(jié)構(gòu)設(shè)計(jì)、分析與試驗(yàn)[J];紅外技術(shù);2011年01期

7 王洋;張景旭;楊飛;;大口徑望遠(yuǎn)鏡主鏡支撐結(jié)構(gòu)研究[J];紅外與激光工程;2006年S2期

8 韓光宇;邵帥;高云國;陳寧;;主鏡側(cè)支撐結(jié)構(gòu)分析與優(yōu)化[J];機(jī)械設(shè)計(jì)與制造;2009年07期

9 馬毅勇,程祖海,張耀寧;高功率激光器窗口熱變形分析的有限元方法[J];強(qiáng)激光與粒子束;1999年01期

10 蘇定強(qiáng),崔向群;主動(dòng)光學(xué)─新一代大望遠(yuǎn)鏡的關(guān)鍵技術(shù)[J];天文學(xué)進(jìn)展;1999年01期

相關(guān)博士學(xué)位論文 前1條

1 孫敬偉;地基大口徑光電成像望遠(yuǎn)鏡裝調(diào)技術(shù)研究[D];中國科學(xué)院研究生院（長春光學(xué)精密機(jī)械與物理研究所）;2011年

，

本文編號(hào)：1925854