Design of Micro-miniature Infrared Seeker with Roll-Pitch Structure
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摘要: 针对导弹口径微小化的需求,为解决微小型导引头无法全方位扫描的问题,提出一种微小型滚仰式红外导引头光机轴系一体化结构。该光机结构把经典滚仰式导引头两根独立俯仰轴与光机结构本体设计成一体,通过红外探测器固定连接的方式让整体结构更加紧凑并兼具焦距微调功能,在保证成像质量的同时大大减小了光机结构的体积。将建模后的光机结构进行有限元热力耦合分析,在导引头温度、位置和角度等8组极限工作情况下,得到结构件和镜片的热变形。分析结果表明,提出的光机结构满足微小型(80 mm)、抗冲击(10g)和高低温(-40℃~60℃)工作要求,可以预测实际使用时的工作情况,对设计具有重要的指导意义。Abstract: To meet the requirements of the micro-miniature air-to-air missile and solve the problem of not reaching full field angle, this paper presents a micro-miniature infrared seeker with roll-pitch structure, applying the integration philosophy of optical-mechanical structure and pitching shaft. Compared with the classic roll-pitch frame, this new structure combines two individual pitch shafts; additionally, the optical-mechanical structureusesonly one mechanical part, thus greatly reducing its size. Moreover, this new structure has a focus function that could improve the image quality. After structure design, we conducted thermo-mechanical coupling analysis on structure parts and lens under eight extreme conditions. The results show that the optical-mechanical structure meets the requirement of micro-miniature(80 mm), shock resistance (10g), and high low temperature test (-40℃~60℃). The simulated analysis can predict real conditions and has great guiding significance for optical-mechanical structure design.
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Key words:
- infrared seeker /
- roll-pitch /
- finite element /
- simulated analysis
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表 1 机械参数
Table 1. Parameters of mechanical performance
Material Density/(g/cm2) Rupture modulus/Mpa Young's modulus/Gpa Poisson ratio Thermal coefficient w/(m·℃) Linear expansion coefficient 10-6/℃ Nc-Ge 5.33 75 103 0.28 59 5.7 7075Al alloy 2.74 524 76 0.33 237 23.5 表 2 零件接触关系设置
Table 2. Contacts setting
Mating part Clamper Tube Clamper Len1 Tube Len1 Len1 Spacer1 Len2 Spacer1 Len2 Spacer2 Len3 Spacer2 Len2 Tube Len3 Tube Tube Mounting Contact Bounded Frictional Frictional Frictional Frictional Frictional Frictional Bounded Bounded Bounded 表 3 网格划分
Table 3. Meshing of parts
Part Clamper Len1 Len2 Len2 Spacer1 Spacer2 Tube Pitch mounting Mesh size/mm 1 0.2 0.2 0.2 1 1 0.5 0.5 Mesh type Tetrahedron Hexahedron Hexahedron Hexahedron Auto Auto Tetrahedron Tetrahedron 表 4 1镜、2镜和3镜在8种情况下的最大变形量
Table 4. Maximum deformation of len1, len2 and len3 under 8 limited conditions
0°
-40℃
+1 mm0°
-40℃
-1 mm0°
60℃
+1 mm0°
60℃
-1 mm90°
-40℃
+1 mm90°
-40℃
-1 mm90°
60℃
+1 mm90°
60℃
-1 mmLen 1 0.0318 0.0324 0.0195 0.0199 0.0324 0.0318 0.0195 0.0198 Len 2 0.0189 0.0202 0.0119 0.0137 0.0178 0.0172 0.0112 0.0125 Len 3 0.0114 0.0123 0.0073 0.0089 0.0099 0.0083 0.0068 0.0081 -
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