Evaluation and test of self-locking ability for focusing mechanism of space camera

Yuan AN; Yi-min DU; Xue-zhi JIA; Lin LI; Ji LI; Shan-liang KE

doi:10.3788/OPE.20182602.0355

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Evaluation and test of self-locking ability for focusing mechanism of space camera

Micro/Nano Technology and Fine Mechanics | 更新时间：2020-07-05

- Evaluation and test of self-locking ability for focusing mechanism of space camera
- Optics and Precision Engineering Vol. 26, Issue 2, Pages: 355-362(2018)
- 作者机构：
  
  1.中国科学院长春光学精密机械及物理研究所, 吉林长春 130033
  2.长光卫星技术有限公司, 吉林长春 130033
  3.中国科学院大学, 北京 100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20182602.0355
  CLC： V445.8
- Received：24 April 2017，
  
  Accepted：23 June 2017，
  
  Published：25 February 2018
- 稿件说明：
移动端阅览
Yuan AN, Yi-min DU, Xue-zhi JIA, et al. Evaluation and test of self-locking ability for focusing mechanism of space camera[J]. Optics and precision engineering, 2018, 26(2): 355-362.
DOI：

Yuan AN, Yi-min DU, Xue-zhi JIA, et al. Evaluation and test of self-locking ability for focusing mechanism of space camera[J]. Optics and precision engineering, 2018, 26(2): 355-362. DOI： 10.3788/OPE.20182602.0355.

摘要

空间相机调焦机构需具有一定的锁止能力，以应对火箭发射中的冲击与振动，因此，对机构的自锁特性进行评价是保证空间光学遥感器正常工作的关键。针对某型空间相机调焦机构，研究了螺纹接触面的滑移机理，建立了工程分析模型，详细分析了两种螺距（1 mm，1.5 mm）的螺纹的接触应力、切应力分布特征及其自锁性。结果表明：螺纹螺距为1 mm的调焦机构Mises应力值大于其自锁标定值，自锁失效；螺距为1.5 mm的调焦机构Mises应力值小于其自锁标定值，满足自锁要求。最后，对调焦机构进行了振动试验，结果显示：螺距为1 mm的调焦机构焦平面位移达2 753

m，自锁失效；螺距为1.5 mm的调焦机构焦平面位移为6

m，小于测量误差，机构自锁正常，验证了分析方法的可靠性。这种动力学环境下研究机构自锁性的新方法对工程应用具有重要的意义。

Abstract

Focusing mechanisms in space camera needs to possess self-locking ability to resist the shock and vibration in the process of launching. Therefore

a self-locking analysis on the mechanism is the key of ensuring the space optics remote sensors work properly. This paper studied the sliding mechanism of thread contact surface under environments of vibration

and built a engineering models of the focusing mechanism of certain space camera with two types of screw pitch (1 mm

1.5 mm). Contact stress

shear stress distribution and self-locking ability of the mechanism were researched in detail. The results showed that the Mises stress value of focusing mechanism with screw pitch 1 mm was bigger than its calibration value of self-locking

which means self-locking lost efficacy. The Mises stress value of focusing mechanism with screw pitch 1.5 mm was under its calibration value of self-locking

which means self-locks was effective. Finally

a random variation test was performed on the focusing mechanism. The results showed that the focal plane's displacement of the mechanism with 1 mm screw pitch reached 2 753

resulting in failure of self-locking. On the contrary

the focal plane's displacement of the mechanism with 1 mm screw pitch reached 6

which was less than measuring error

the mechanism worked properly. It can be seen that the analysis approach proposed is effective

reliable

and provides a new way of researching the self-locking of focusing mechanism under the dynamic environment.

关键词

Keywords

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