机载宽温条件下反射镜组件与粘接层设计

张家齐; 郭艺博; 张友建; 张志华

doi:10.37188/CO.2022-0194

机载宽温条件下反射镜组件与粘接层设计

doi: 10.37188/CO.2022-0194

张家齐^1, ,,
郭艺博^{1, 2,},
张友建^3,,
张志华^{1, 2,}

1.
长春理工大学空间光电技术国家地方联合工程研究中心, 吉林长春 130000
2.
长春理工大学机电工程学院, 吉林长春 130000
3.
吉林珩辉光电科技有限公司, 吉林长春 130000

基金项目: 国家自然科学基金重大研究计划（No. 91338116）

详细信息

作者简介:
张家齐（1985—），男，吉林白山人，博士，助理研究员，硕士生导师，2019年于长春理工大学获得博士学位，主要从事伺服跟踪结构、光机系统集成方面的研究。E-mail：zjq_cust@foxmail.com

郭艺博（1998—），男，河南周口人，硕士研究生，2020年于长春理工大学获得学士学位，主要从事激光通信终端、伺服转台结构方面的研究。E-mail：17843081568@163.com

张友建（1992—），男，吉林敦化人，硕士，2020年于长春理工大学获得硕士学位，主要从事光机结构设计、伺服转台结构方面的研究。E–mail：756919950@qq.com

张志华（1998—），男，山东青岛人，硕士研究生，2021年于青岛农业大学获得学士学位，主要从事光电跟瞄装置、伺服转台结构方面的研究。E-mail：zhangzhihua257@163.com

中图分类号: V248.1
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出版历程
- 收稿日期: 2022-09-16
- 修回日期: 2022-10-08
- 录用日期: 2022-11-02
- 网络出版日期: 2022-12-09

Design of reflector assembly and adhesive layer under airborne wide temperature conditions

ZHANG Jia-qi^{1
, ,},
GUO Yi-bo^{1, 2
,},
ZHANG You-jian^3
,,
ZHANG Zhi-hua^{1, 2
,}

1.
National and Local Joint Engineering Research Center of Space and Optoelectronics Technology, Changchun University of Science and Technology, Changchun 130000, China
2.
College of Mechanical and Electrical Engineering, Changchun University of Science and Technology, Changchun 130000, China
3.
Jilin Henghui Photoelectricity Technology Co, ltd., Changchun 130000, China

Funds: Supported by the Major Research plan of the National Natural Science Foundation of China (No. 91338116)

More Information

Corresponding author: zjq_cust@foxmail.com

摘要

摘要:
在机载宽温且反射镜镀膜温度较高的条件下，针对传统反射镜镶嵌件粘接工艺导致反射镜粘接失效、铟钢镶嵌件和反射镜线胀系数差异导致宽温下反射镜面型急剧下降的问题，提出了一种反射镜加工镀膜后再粘接镶嵌件的方法，并对其胶层参数进行研究。采用硅橡胶作为主粘接剂粘接反射镜与镶嵌件，利用硅橡胶固化后良好的弹性缓解支撑件热变形对反射镜面型的影响。通过多目标优化选取合适的硅橡胶粘接厚度1.1 mm，硅橡胶宽度7.2 mm，环氧胶厚度0.022 mm。仿真结果显示在重力及温度变化为−40 °C时（初始温度为20 °C），反射镜面型精度RMS值为25.91 nm，镜组模态一阶频率为242 Hz。最终面型检测RMS值为15.8 nm，结构谐振频率为213 Hz。试验结果显示，此方案使反射镜组件适用于大温差条件下工作，其结构和粘接层设计能够满足机载宽温和振动条件下的使用要求。
- 单摆镜 /
- 粘接层设计 /
- 有限元分析 /
- 红外搜跟系统
Abstract:
Airborne ambient temperature varies widely and airborne vibration can be strong. Because there is a difference in the thermal expansion coefficients of an Invar inlay and mirror material, a mirror’s higher coating temperature means that the traditional bonding process will lead to bonding failure and the surface precision of the mirror cannot meet system requirements. Therefore, this paper proposes a new method of bonding the mirror after processing and coating, and designs some important parameters for the adhesive layer. RTV is used as the main binder for the mirror and the inlay, and the effect of RTV curing on the structure is alleviated by favorable elasticity. The thickness of RTV is 1.1 mm, its width is 7.2 mm and the thickness of the epoxy adhesive is 0.022 mm. The simulation results show that the RMS of the mirror shape is 25.91 nm and the first-order frequency of the mirror group mode is 242 Hz when the gravity is 1 g and temperature change are −40 °C (the initial temperature is 20 °C). The final surface detection RMS is 15.8 nm and the resonance frequency is 213 Hz. The experimental results show that the design, structure and bonding layer can meet the wide temperature range and vibration requirements.
- single pendulum mirror /
- bonding layer design /
- finite element analysis /
- infrared tracking system

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图 1 机载红外搜跟系统原理

Figure 1. Principle of the airborne infrared searching and tracking system

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图 2 单反镜伺服系统三维模型

Figure 2. Three-dimensional model of the mirror servo system

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图 3 反射镜组件沿回转轴剖视结构

Figure 3. Profile view of mirror assembly along the axis of rotation

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图 4 胶层布置方案

Figure 4. Adhesive layer arrangement scheme

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图 5 反射镜组件有限元结构模型

Figure 5. Finite element structural model of the mirror assembly

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图 6 RTV宽度对反射镜面型及镜组模态频率的影响

Figure 6. Influence of RTV width on mirror shape and mirror group modal frequency

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图 7 RTV厚度对反射镜面型及镜组模态频率的影响

Figure 7. Influence of RTV thickness on mirror shape and mirror group modal frequency

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图 8 环氧胶厚度对反射镜面型及镜组模态频率的影响

Figure 8. Effect of epoxy adhesive thickness on mirror shape and mirror group modal frequency

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图 9 反射镜面型仿真拟合流程图

Figure 9. Flow chart of mirror shape simulation

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图 10 ZYGO干涉仪面型拟合结果

Figure 10. ZYGO interferometer fitting results

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图 11 组件模态分析位移云图。（a）一阶模态；（b）二阶模态；（c）三阶模态

Figure 11. Displacement cloud diagram of the structural modal analysis. (a) First-order mode; (b) second-order mode; (c) third-order mode

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图 12 （a）随机振动结构应力云图；（b）冲击试验应力云图

Figure 12. (a) Stress nephogram of a random vibration structure; (b) impact test stress nephogram

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图 13 反射镜组件试验现场。（a）随机振动；（b）温度冲击试验

Figure 13. Test site of mirror assembly. (a) Random vibration; (b) temperature impact test

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图 14 反射镜面型检测光路图

Figure 14. Optical path diagram for shape accuracy measurement of the mirror

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图 15 整体结构实际检测面型

Figure 15. Measuring the surface shape accuracy of the integral structure

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表 1 反射镜组件材料表

Table 1. List of materials for mirror assemblies

Structure	Material	Density ρ/(g·cm⁻³)	Young's modulus E/GPa	CTE α(10⁻⁶/K)	Thermal conductivity λ/[W/(m·k)]	Specific stiffness E/ρ(10⁻⁶·GNm/g)	Thermal distortion ratio λ/α(10⁶W/m)
mirror	SiC	3.2	450	2.3	155.00	140	64.58
back plate, side plate, bushing part, embedded part, gasket	4J32	8.1	150	2.5	145.00	18.5	11

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表 2 5种工况下反射镜面型拟合结果

Table 2. Shape fitting results of the mirror under five working conditions

环境温度	20 °C	20 °C	20 °C	-40 °C	60 °C
重力方向	X轴	Y轴	Z轴	Z轴	Z轴
PV值/nm	25.91	22.12	55.45	123.87	96.78
RMS值/nm	3.73	3.63	10.25	25.91	17.55

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