基于ANSYS Workbench的光学探测系统热-结构仿真分析

李欢; 胡亮; 孟祥福; 李琪; 王爽

基于ANSYS Workbench的光学探测系统热-结构仿真分析

上海航天控制技术研究所，上海 201109

详细信息

作者简介:
李欢（1993-），男，河南商丘人，结构工程师，硕士研究生，研究方向：工程结构设计与有限元仿真。E-mail：lihuan977@163.com

中图分类号: TN216
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- 被引次数: 0
出版历程
- 收稿日期: 2020-04-18
- 修回日期: 2020-06-02
- 刊出日期: 2020-12-26

Simulation Analysis of Thermal-Structure of an Optical Detection System

Shanghai Aerospace Control Technology Institute, Shanghai 201109, China

摘要

摘要: 热载荷是导致红外探测系统失效的主要原因之一，因此本文利用ANSYS Workbench软件对某红外成像光学探测组件进行不同温度载荷下的热-结构耦合分析。首先观察光学镜头与探测器之间后截距在不同温度载荷下的响应；然后利用光学软件ZEMAX得到后截距变化时理论上光学的成像质量；最后通过实验验证了理论计算模型，同时得到了不同温度载荷下光学探测系统的变形规律，发现探测器安装材料的热传导系数与热膨胀系数都会影响到探测系统的稳定性。本文的研究工作对红外成像光学探测系统的设计、优化以及可靠性方面具有重要的指导意义。
- 光学探测 /
- 热-结构 /
- 成像 /
- 稳定性
Abstract: Thermal load is one of the main reasons for the failure of infrared detection system, therefore, thermal-structure coupling analysis of a certain type of infrared imaging optical detection module under different temperature loads by means of ANSYS Workbench software was performed in this study. First, the response of the back intercept between the optical lens and the detector under different temperature loads was observed, and then, the theoretical imaging quality was calculated by the optical software ZEMAX on the basis of the back intercept. Finally, the theoretical calculation models were verified by the environment test. Simultaneously, the deformation rule of the optical detection module under different temperature loads was obtained, and it was found that the conductivity coefficient and thermal expansivity of the installation material of the detector affected the stability of the detection module. This research can provide guidance on the design, optimization, and reliability of infrared imaging optical detection modules.
- optical detection /
- thermal-structure /
- imaging /
- reliability

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图 1 光学探测组件结构模型

Figure 1. Structure model of the optical detection system

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图 2 光学探测组件有限元模型

Figure 2. Finite element model of the optical detection system

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图 3 常温下探测系统的温度场与位移场分布

Figure 3. Distribution of the temperature field and the displacement field of the detection module at normal temperature

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图 4 高温下探测系统的温度场与位移场分布

Figure 4. Distribution of the temperature field and the displacement field of the detection module at high temperature

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图 5 低温下探测系统的温度场与位移场分布

Figure 5. Distribution of the temperature field and the displacement field of the detection module at low temperature

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图 6 不同温度载荷下探测系统的传函值

Figure 6. MTF values of the detection module at different temperature loads

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图 7 探测器安装材料分别为铝合金、钛合金时探测系统图像梯度、传函值和温度载荷的关系

Figure 7. The detection module image gradient, MTF value evolution with the temperature load of the detect system when the installation material of detector are aluminium alloy and titanium alloy

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表 1 零件名称及其对应的材料

Table 1. Name of parts and the corresponding materials

Name of parts	Material
Frame, lens base	Titanium alloy
Detector	Kovar alloy
Base of detector	Aluminium alloy/Titanium alloy
Bolt	Stainless steel
Lens	Chalcogenide glass

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表 2 材料的热力学系数

Table 2. Thermodynamics coefficient of materials

Material	Density/(kg/m³)	Young’s modulus/Pa	Poisson’s ratio	Thermal conductivity coefficient/(W/mC)	Thermal expansion coefficient/(C^-1)
Aluminium alloy	2770	7.1×10¹⁰	0.33	150.0	2.3×10^-5
Titanium alloy	4620	9.6×10¹⁰	0.36	21.9	9.4×10^-6
Stainless steel	7750	1.9×10¹¹	0.31	15.1	1.7×10^-5
Kovar alloy	8170	1.6×10¹¹	0.36	17.6	5.5×10^-6
Chalcogenide glass	4710	2.0×10¹⁰	0.28	0.2	6.6×10^-6

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表 3 制冷机热分析参数

Table 3. Thermal analysis parameters of the refrigerator

Environment	Convection coefficient /(W/m²·℃)	Internal heat strength/(W/m³)
High temperature (60℃)	30.0	2.0×10⁵
Normal temperature (26℃)	9.7	1.6×10⁵
Low temperature (-45℃)	30.0	8.0×10⁴

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表 4 不同温度载荷下结构位移

Table 4. Displacement of the structure at different temperature load

Temperature load	Base material	Displacement of lens end/mm	Displacement of detector end /mm	Change of the back intercept/mm (negative for increase)
Normal temperature	Aluminium alloy	-0.0053	0.0125	-0.0178
Normal temperature	Titanium alloy	-0.0041	0.0032	-0.0073
High temperature	Aluminium alloy	-0.0173	0.0264	-0.0437
High temperature	Titanium alloy	-0.0165	0.0046	-0.0211
Low temperature	Aluminium alloy	0.0295	-0.0402	0.0697
Low temperature	Titanium alloy	0.0287	-0.0126	0.0413

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表 5 不同温度载荷下铝合金座系统时实验图像

Table 5. The experimental images of the aluminium alloy mount system at different temperature loads

Integrated time/ms	The experimental images
Integrated time/ms	-45℃	26℃	60℃
2
4
6

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表 6 不同温度载荷下钛合金座时实验图像

Table 6. The experimental images of the titanium alloy mount system at different temperature loads

Integrated time/ms	The experimental images
Integrated time/ms	-45℃	26℃	60℃
2
4
6

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表 7 不同积分时间下图像梯度值

Table 7. The image gradient values of different integral time

Temperature load	Base material	2ms	4ms	6ms
Normal temperature	Aluminium alloy	255	504	978
Normal temperature	Titanium alloy	270	541	1084
High temperature	Aluminium alloy	143	241	472
High temperature	Titanium alloy	247	504	1037
Low temperature	Aluminium alloy	51	149	236
Low temperature	Titanium alloy	126	202	340

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