Design of reflector assembly and adhesive layer under airborne wide temperature conditions
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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。
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.
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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
图 6RTV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
图 7RTV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
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
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
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
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
图 14反射镜面型检测光路图
Figure 14.Optical path diagram for shape accuracy measurement of the mirror
图 15整体结构实际检测面型
Figure 15.Measuring the surface shape accuracy of the integral structure
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/GPaCTE
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, gasket4J32 8.1 150 2.5 145.00 18.5 11 
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表 25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 下载:
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