第20卷第8期 2012年8月
文章编号
1004-924X(2012)08-1718-07
光学精密工程
Optics and Precision Engineering
Vol. 20No.8
Aug.2012
Φ510mmSiC超轻量化反射镜的设计与有限元分析
张媛媛*，敬畏，程云涛，胡桂涛，方敬忠（中国科学院光电技术研究所，四川成都610209）
结构，当设计重量为1,85kg时，通过调整各个结构参数与另外两种相同重量的轻量化结构进行了比较。结果表明，在同样背部6点支撑作用下，该超轻量化结构在光轴指向天页时由自重引起的面形(RMS)具有较大优势。利用Patran Nastran有限元软件模拟计算了该超轻量化反射镜在光轴水平状态下的自重镜面变形，并对其进行了热力学及动力学特性分析。分析结果显示，该超轻量化反射镜各项指标均能满足使用要求。最终，根据设计结果试制加工了一块镜坏，初
步加工后的重量约为2.2kg，面密度约为10.8kg/m，已达到目前SiC超轻量化反射镜的先进水平。关键词：超轻量化反射镜；碳化硅反射镜；反应烧结；PatranNastran
中图分类号：TH703
文献标识码：A
doi;10,3788/OPE.20122008.1718
DesignandfiniteelementanalysisofΦ5i0mm
SiCultra-lightweightmirror
ZHANG Yuan-yuan',JING Wei,CHENGYun-tao,HU Gui-tao,FANG Jing-zhong
(Institute of OpticsandElectronics,ChineseAcademyof Sciences,Chengdu610209,China)
*Correspondingauthor,E-mail:pinkoliver@sina.com
Abstract: To develop a @51o mm SiC ultra-lightweight mirror, this paper proposes an ultra-light-weight structure with a section in ship form, an internal structure in regular-triangle, and a face plate reinforced with regular-hexagon. When the design weight is 1., 85 kg, the structure performance is compared with those of other two lightweight structures with the same weight by adjusting all struc ture parameters. It is shown that in the same 6 point supportings on mirror backs, this ultra-light-weight structure owns absolute advantages in the gravitational deformation of mirror surface (RMS) as comparing with other two structures when the optical axis is pointed to the zenith, Furthermore, Patran)Nastran finite element software is used to simulate and calculate the gravitational deformation of the mirror surface when the axis is pointed to the horizon, and its thermodynamic and dynamical characteristics are analyzed, The results present that all performance indexes of this ultra-lightweight mirror meet requirements of applications. Finally, according to the design, a mirror blank with a weight about 2. 2 kg and surface density about 10. 8 kg/m’ is fabricated, With excellent performance.
收稿日期：2012-02-16；修订日期：2012-03-23，
基金项目：中国科学院光电技术研究所前沿部署项目(No.C09K007)