Carbon fiber thin-walled cylindrical support structure between primary and secondary mirror in space camera

Xunpeng SONG; Xiaoxue GONG; Lei ZHANG; Jian YUAN; Yunfei YANG

doi:10.37188/OPE.20223000.0073

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Carbon fiber thin-walled cylindrical support structure between primary and secondary mirror in space camera

更新时间：2022-05-12

- Carbon fiber thin-walled cylindrical support structure between primary and secondary mirror in space camera
- Optics and Precision Engineering Pages: 1-11(2022)
- 作者机构：
  
  长光卫星技术股份有限公司，吉林长春 130102
- 作者简介：
  
  E-mail： songxunpeng@163.com
- 基金信息：
- DOI：10.37188/OPE.20223000.0073
  CLC： V447.1
- Received：23 February 2022，
  
  Revised：21 March 2022，
- 稿件说明：
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宋训鹏,龚小雪,张雷等.空间相机碳纤维薄壁筒式主次镜支撑结构[J].光学精密工程,

SONG Xunpeng,GONG Xiaoxue,ZHANG Lei,et al.Carbon fiber thin-walled cylindrical support structure between primary and secondary mirror in space camera[J].Optics and Precision Engineering,
宋训鹏,龚小雪,张雷等.空间相机碳纤维薄壁筒式主次镜支撑结构[J].光学精密工程, DOI：10.37188/OPE.20223000.0073

SONG Xunpeng,GONG Xiaoxue,ZHANG Lei,et al.Carbon fiber thin-walled cylindrical support structure between primary and secondary mirror in space camera[J].Optics and Precision Engineering, DOI：10.37188/OPE.20223000.0073

摘要

大口径、长焦距空间遥感相机中，主次镜间相对位置变化影响相机的成像质量和稳定性，主次镜支撑结构作为主次镜间承力结构，是相机设计过程中的关键一环。本文针对大口径、长焦距相机特点，设计并研制了碳纤维薄壁筒式主次镜支撑结构。首先，根据给定光学系统，选取了筒式基结构形式。然后，根据筒式基结构形式的特点，依次对筒式结构的次镜支撑梁和纵向加强筋的几何结构形式进行了分析与选型。接着，为了充分发挥碳纤维材料铺层可设计性特点，对主次镜支撑结构进行了结构关键尺寸、铺层厚度和铺层角度三者的迭代优化设计，并对设计结果进行了有限元仿真分析。最后，通过测量次镜角度变化量和特征级扫频振动试验，验证了支撑结构的稳定性和结构刚度。试验结果表明：次镜相同状态下长期监测差值变化量<1.5″，重力翻转前后变化量<1.08″，支撑结构一阶固有频率>115 Hz，轴向频率>180 Hz，表明主次镜支撑结构具有良好的刚度和结构稳定性，满足设计指标要求。

Abstract

In large-aperture and long-focus space remote sensing cameras， the relative position changes between the primary and secondary mirror affect the imaging quality and stability of the camera. The support structure between the primary and secondary mirror， as the bearing structure between the primary and secondary mirror， is a key part of the camera design process. In this paper， according to the characteristics of large-aperture and long-focus cameras， a carbon fiber thin-walled cylindrical support structure between primary and secondary mirror is designed and developed. First of all， according to the given optical system， the cylindrical base structure was selected. Then， according to the characteristics of the cylindrical base structure， the geometric structure of the secondary mirror support beam and the longitudinal reinforcement ribs of the cylindrical structure were analyzed and selected in sequence. Then， in order to make full use of the design characteristics of carbon fiber material layup， the iterative optimization design of the key size of the support structure， the thickness of the layup and the angle of the layup were carried out， and the design results were analyzed by finite element simulation. Finally， the stability and structural rigidity of the support structure was verified by measuring the angle change of the secondary mirror and the characteristic-level sweep frequency vibration test. The results indicate that the long-term monitoring difference change under the same condition of the secondary mirror is less then 1.5"， the change before and after gravity flipping is less then 1.08"， the first-order natural frequency of the supporting structure is greater then 115 Hz， and the axial frequency is greater then 180Hz， indicating that the support structure between primary and secondary mirrors has great rigidity and structural stability， satisfing the requirements of design index.

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Related Institution

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