宇航学报

宇航学报 ›› 2017, Vol. 38 ›› Issue (11): 1226-1233.doi: 10.3873/j.issn.1000-1328.2017.11.012

• 环境试验与器件 • 上一篇    下一篇

一种影响空间相机成像的制冷机微振动分析方法

张恒，李世其，刘世平，王跃，张哲   

  1. 1. 华中科技大学机械科学与工程学院，武汉 430074；2. 北京空间机电研究所，北京 100094
  • 收稿日期:2017-03-21 修回日期:2017-09-11 出版日期:2017-11-15 发布日期:2017-11-25
  • 基金资助:

    国家科技重大专项

An Analysis Method of Effect of Cryocooler Microvibration on Space Camera Imaging

ZHANG Heng, LI Shi qi, LIU Shi ping, WANG Yue, ZHANG Zhe   

  1. 1. School of Mechanical Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
     2. Beijing Institute of Space Mechanics & Electricity, Beijing 100094, China
  • Received:2017-03-21 Revised:2017-09-11 Online:2017-11-15 Published:2017-11-25

PDF

362

摘要：

针对空间制冷机微振动对光学遥感器成像质量难以准确评估的问题，提出一种制冷机-空间相机的集成建模分析与试验验证方法。该方法建立了系统的集成分析模型，实现了微振源-相机结构传递-光路模型的分析过程。首先，利用一种制冷机的刚性安装测试和自由悬吊测试获取制冷机的扰动载荷。然后，采用一种力过滤方法改进传统的扰动分析过程。最后，通过集成有限元分析计算光学系统调制传递函数，得出制冷机微振动对空间相机成像的影响。分析结果表明，这种方法能更精确辨识制冷机微振动及其传递特性，从而能准确分析空间相机光学载荷的稳定性。

关键词: 空间相机, 微振动, 耦合扰动分析, 集成模型, 微振动试验

Abstract:

Aiming at accurately evaluation of image quality on an optical remote camera, an integrated modeling analysis and experimental verification method of microvibration induced by space cryocooler is proposed. This method establishes the system model and realizes the analysis process of microvibration source-camera transfer-optical model. Firstly, a blocked test with the coolerhardmounted and a free-free dynamic test by suspending the cryocooler are performed to obtain the disturbance data. Then, the force filter method is used to improve the traditional disturbance analysis. Finally, the performance of optics represented by MTF change is calculated by integrating finite element analysis. The results show that this method can accurately identify microvibration and its transfer characteristics, which can be used to accurately analyze the stability of optical load on space camera.

Key words: Space camera, Microvibration； Coupled disturbance analysis； Integrated model； Microvibration test

中图分类号: