Optimum design of edge-lateral support for large-aperture lightweight primary mirror

FAN Lei; ZHANG Jing-xu; WU Xiao-xia; WANG Fu-guo; CHEN Fu-lin; YANG Hong-bo

doi:10.3788/OPE.20122010.2207

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Optimum design of edge-lateral support for large-aperture lightweight primary mirror

Article | 更新时间：2020-08-12

- Optimum design of edge-lateral support for large-aperture lightweight primary mirror
- Optics and Precision Engineering Vol. 20, Issue 10, Pages: 2207-2213(2012)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所,吉林长春,中国,130033
  2. 中国科学院大学北京,中国,100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20122010.2207
  CLC： TH703;TH751
- Received：17 June 2012，
  
  Revised：03 August 2012，
  
  Published：10 October 2012
- 稿件说明：
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范磊, 张景旭, 吴小霞, 王富国, 陈夫林, 杨洪波. 大口径轻量化主镜边缘侧向支撑的优化设计[J]. 光学精密工程, 2012,20(10): 2207-2213

FAN Lei, ZHANG Jing-xu, WU Xiao-xia, WANG Fu-guo, CHEN Fu-lin, YANG Hong-bo. Optimum design of edge-lateral support for large-aperture lightweight primary mirror[J]. Editorial Office of Optics and Precision Engineering, 2012,20(10): 2207-2213
范磊, 张景旭, 吴小霞, 王富国, 陈夫林, 杨洪波. 大口径轻量化主镜边缘侧向支撑的优化设计[J]. 光学精密工程, 2012,20(10): 2207-2213 DOI： 10.3788/OPE.20122010.2207.

FAN Lei, ZHANG Jing-xu, WU Xiao-xia, WANG Fu-guo, CHEN Fu-lin, YANG Hong-bo. Optimum design of edge-lateral support for large-aperture lightweight primary mirror[J]. Editorial Office of Optics and Precision Engineering, 2012,20(10): 2207-2213 DOI： 10.3788/OPE.20122010.2207.

摘要

对大口径主镜的侧向支撑结构进行了优化

以便最大限度地降低重力作用下的镜面变形。首先

从理论上给出了一种优化主镜边缘侧支撑结构的判据和思路

然后

引入边缘切向剪切侧支撑原理

阐述了这种支撑形式的优化思想和优势。以口径为2060 mm的扇形轻量化主镜作为分析实例

采用16个边缘离散支撑点

优化设计等角间距侧向支撑

并针对轻量化主镜的结构特点和等角间距支撑下支撑力值相差较大的缺点

将等角间距改为不等角间距侧向支撑

分析推导了相应的支撑力公式。结果显示

改进后的支撑形式提高了系统的支撑刚度

镜面变形由原来的1.723 nm降为1.633 nm。所研究的边缘切向剪切支撑方式很大程度上保证了主镜镜面面形

对不同口径的扇形孔轻量化主镜的设计有普适性。

Abstract

The lateral support structure of a large aperture primary mirror was researched and optimized to effectively reduce the deformation of the primary mirror under the gravity. First

an idea and criterion to optimize the edge-lateral support structure was provided theoretically.Then

on the basis of the tangential shearing support principle

the optimization procedure of the support structure and its merit were explained. Based on the principle

a lightweight mirror with a diameter of 2 060 mm was taken as an example

and an equal-angle lateral support was optimized by using 16 discrete points. According to the characteristic of the lightweight mirror

the original supporting structure was improved to be the no-equal-angle lateral support to avoid the disadvantage that the gap between the support forces was large in previous structure. The results indicate that the supporting stiffness of the system has been enhanced and the mirror deformation is reduced from 1.723 nm to 1.633 nm. It concludes that the edge tangential shearing support structure which is fit to the lightweight mirror with sector hole can keep the mirror surface figure to a large extent. So this method provides a new option for the lateral support of large-aperture lightweight mirror.

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references

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