大口径空间红外相机铍铝合金反射镜组件材料选择与设计  

Material selection and design of beryllium-aluminum alloy mirror assembly for large-diameter space infrared camera

作　　者：翟岩 姜会林(指导)[1] 梅贵[2] 江帆[2] Zhai Yan;Jiang Huilin;Mei Gui;Jiang Fan(The School of Electro-Optical Engineering,Changchun University of Science and Technology,Changchun 130022,China;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China)

机构地区：[1]长春理工大学光电工程学院,吉林长春130022 [2]中国科学院长春光学精密机械与物理研究所,吉林长春130033

出　　处：《红外与激光工程》2020年第6期288-294,共7页Infrared and Laser Engineering

基　　金：国家自然科学基金(61405191)。

摘　　要：针对某空间摆扫相机系统,为了保证空间红外相机获得轻质、可靠的摆扫头部,且各反射镜均具有良好的面形精度及较高的一阶固有频率,对其摆扫部分的结构进行了针对性研究。选择了铍铝合金材料作为Φ750 mm口径主反射镜材料,以钛合金材料的柔性支撑结构支撑,安装在铍铝合金材料的主镜室内。包含次镜组件、次镜支撑和遮光筒,整个摆动部分总质量为17.5 kg。采用有限元方法对反射镜组件在力热耦合状态下进行了仿真分析,结果表明反射镜全口径最大面形误差RMS值为27.04 nm,满足全口径范围内面形误差不低于λ/20(λ=632.8 nm)的要求。摆动部分一阶谐振频率为122 Hz,为控制系统预留了较大的带宽。实体模型的力学试验结果与有限元分析结果接近,表明满足总体对摆扫部分的设计要求。In order to ensure that the space infrared camera obtained a light and reliable sweeping head,and the mirrors had good surface accuracy and a high first-order natural frequency for the space sweeping camera system,the structure of sweeping part was studied in a targeted manner.The beryllium-aluminum alloy material was selected as theΦ750 mm diameter main mirror material,the flexible support structure of the titanium alloy material was selected as the support structure,and installed in the main mirror chamber of the berylliumaluminum alloy material.It included a secondary mirror assembly,a secondary mirror support part and a lightshielding cylinder.The total weight of the entire swinging part was 17.5 kg.The finite element method was used to simulate the mirror assembly under the condition of force and heat coupling.The results show that the maximum surface error RMS of the mirror is 27.04 nm,which is no less thanλ/20(λ=632.8 nm)in the full aperture range requirements.The first-order resonant frequency of the oscillating portion is 122 Hz,which reserves a large bandwidth for the control system.The mechanical test results of the solid model are close to those of the finite element analysis,indicating that the overall design requirements for the sweeping part are met.

关 键 词：摆扫相机 铍铝合金材料 有限元分析 力学试验 

分 类 号：V445.8[航空宇航科学与技术—飞行器设计]