Mechanical performance of magnetic flux-pinging mechanism in space large segmented reflect mirror

Hao-su ZHANG; Ai-hong SHANGGUAN; Chang-bo CHU; Yan WEN

doi:10.3788/OPE.20192712.2609

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Mechanical performance of magnetic flux-pinging mechanism in space large segmented reflect mirror

更新时间：2020-07-09

- Mechanical performance of magnetic flux-pinging mechanism in space large segmented reflect mirror
- Optics and Precision Engineering Vol. 27, Issue 12, Pages: 2609-2617(2019)
- 作者机构：
  
  1.中国科学院西安光学精密机械研究所, 陕西西安 710119
  2.中国科学院大学, 北京 100049
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20192712.2609
  CLC： V447.1
- Received：29 September 2019，
  
  Accepted：16 October 2019，
  
  Published：25 December 2019
- 稿件说明：
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Hao-su ZHANG, Ai-hong SHANGGUAN, Chang-bo CHU, et al. Mechanical performance of magnetic flux-pinging mechanism in space large segmented reflect mirror[J]. Optics and precision engineering, 2019, 27(12): 2609-2617.
DOI：

Hao-su ZHANG, Ai-hong SHANGGUAN, Chang-bo CHU, et al. Mechanical performance of magnetic flux-pinging mechanism in space large segmented reflect mirror[J]. Optics and precision engineering, 2019, 27(12): 2609-2617. DOI： 10.3788/OPE.20192712.2609.

摘要

应用于空间光学系统的机械拼接机构存在润滑、热膨胀系数匹配、结构复杂、拼接偏心距小等问题，本文提出了可应用于空间大口径拼接反射镜的磁通钉扎接口方案，采用永磁体的等效电流分布模型并融合磁场法，建立了超导-永磁体磁通钉扎接口的数学模型进行仿真分析，并通过实验验证了模型的有效性。结果表明，超导体-永磁体的间隔在5 mm时，垂直连接刚度

可达7 000 N/m；当磁体-超导体的间隔为10 mm，二者处于中心位置时侧向刚度

可达3 800 N/m；磁通钉扎接口在偏心距Δ

=4 mm时的垂直刚度

相比于Δ

=0时下降约20%，刚度下降不显著。相比于传统机械接口，磁通钉扎接口在反射镜对接时具备足够的连接刚度，可以允许更大的偏心距Δ

，同时接口的力特性使得拼接镜在重构过程中满足缓冲定位的要求。

Abstract

Mechanical connection mechanisms used in space optical systems experience problems with lubrication

thermal expansion coefficient matching

problems related to its complex structure

and small docking eccentricities. In this study

a flux-pinning interface scheme

which can be applied to a large segmented reflect mirror in space

was proposed. The mathematical model that contained the current equivalent distribution model was built and calculated by the H-formulation method

then

verification experiments were designed to demonstrate the effectiveness of the model. The relationship between the levitation force

stiffness

and relative position of the flux pinning interface under three working condition was obtained using the finite element method. The results indicate that when the distance between the superconductor and permanent magnet is 5 mm

the stiffness of the vertical direction

can reach 7 000 N/m; when the distance between the superconductor and permanent magnet is 10 mm and it is in a central position

the stiffness of the lateral direction

can reach 3 800 N/m. The stiffness of the vertical direction

when Δ

=4 mm drops by 20% as compared with the one with Δ

=0 mm

therefore

the mechanism can provide greater Δ

values than traditional mechanisms and sufficient stiffness

which can also be used for buffering when docking.

关键词

Keywords

references

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