Mechanical analysis of pointing mechanism for space spectrometer

LIU Lei

doi:10.3788/OPE.20152311.3161

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Mechanical analysis of pointing mechanism for space spectrometer

更新时间：2020-08-13

- Mechanical analysis of pointing mechanism for space spectrometer
- Optics and Precision Engineering Vol. 23, Issue 11, Pages: 3161-3167(2015)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152311.3161
  CLC： TP73;TH133.3
- Received：15 December 2014，
  
  Revised：06 February 2015，
  
  Published：25 November 2015
- 稿件说明：
移动端阅览
刘磊,. 空间光谱仪指向机构的力学分析[J]. 光学精密工程, 2015,23(11): 3161-3167

LIU Lei,. Mechanical analysis of pointing mechanism for space spectrometer[J]. Editorial Office of Optics and Precision Engineering, 2015,23(11): 3161-3167
刘磊,. 空间光谱仪指向机构的力学分析[J]. 光学精密工程, 2015,23(11): 3161-3167 DOI： 10.3788/OPE.20152311.3161.

LIU Lei,. Mechanical analysis of pointing mechanism for space spectrometer[J]. Editorial Office of Optics and Precision Engineering, 2015,23(11): 3161-3167 DOI： 10.3788/OPE.20152311.3161.

摘要

为了准确分析空间CO

光谱仪指向机构的力学特性

本文根据轴承结构参数

建立了轴承有限元接触分析模型。计算了不同载荷下轴心的位移量

用多项式对计算结果进行拟合得到轴承非线性刚度曲线。在指向机构有限元力学模型中

利用相应刚度的弹簧单元替代轴承结构

经过有限元频率响应分析后获得指向机构的动态特性。仿真实验显示:在重力工况下指向镜的面形在光轴和子午方向分别为19.23 nm和19.27 nm

满足优于

/30(均方根值RMS

=632.8 nm)的设计要求

3个方向基频均大于100 Hz。振动试验显示

3个方向基频均优于100 Hz

振动试验后反射镜镜面面形精度为

/35。分析结果与仿真结果相符

表明利用非线性接触分析方法可以较为准确地求解轴承刚度

同时空间光谱仪指向机构静/动力学性能满足设计要求。

Abstract

To accurately analyze dynamic characteristics of pointing mechanism of a CO

space spectrometer

a bearing finite element contact analysis model was established according to the bearing structural parameters in this paper. The displacements with different loads for an axis were calculated

and the nonlinear stiffness curve for the bearing was obtained by the polynomial fitting for calculated results. In finite element dynamic analysis model of pointing mechanism

a spring unit with corresponding stiffness was used to replace the bearing structure

and the dynamic characteristics of the pointing mechanism were obtained by analysis of infinite element frequency response. The simulation experiment shows that the surface shape of mirror is 19.23 nm and 19.27 nm in optics axis and meridian direction at a static condition

which satisfy the design requirement of

/30(RMS

=632.8 nm) and all base frequencies in 3 directions are over 100 Hz. Moreover

mechanical vibration experiments also verify that all base frequencies in 3 directions are over 100 Hz and the surface shape accuracy of the mirror is

/35. The calculation results agree well with the experimental results. It concludes that the analysis method with nonlinear contact solves the bearing stiffness accurately

and the static/dynamic performance of pointing mechanism meets design requirements.

关键词

Keywords

references

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