一种空间相机调焦机构的设计与分析  

Design and Analysis of Focusing Mechanism for Space Camera

作　　者：范洪杰[1] 董吉洪[1] 李威[1] 张远清[1] 郭权峰[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130033

出　　处：《长春理工大学学报（自然科学版）》2016年第3期1-4,共4页Journal of Changchun University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金(60507003)

摘　　要：为补偿空间相机由于温度、轨道高度变化,以及运载过程中冲击和振动等影响引起的离焦,并满足空间相机质量更轻、体积更小的需求,设计了一种调焦机构。该调焦机构采用步进电机和谐波齿轮减速器进行驱动,精密滚珠丝杠进行传动,直线轴承进行导向,绝对式编码器与滚珠丝杠同轴安装测量,总质量仅为1.4千克。论述了调焦机构的方案选择,给出了调焦机构的设计结构图。分析计算了调焦机构的的调焦误差,理论误差为5.1μm,满足调焦精度要求。此外,利用有限元对轻量化后的调焦机构进行了模态分析,结果表明其结构刚度较高,满足使用要求。In order to compensating defocusing caused by the changing of temperature and orbital altitude, camera launching vibration and shock,and to meeting the overall design requirement of the camera for the lower mass and small size,a focusing mechanism is provided in this paper. This focusing mechanism,which consists of step motor,harmonic gear reducer,precision screw ball,linear bearing and absolute encoder installed on the ball screw coaxially,weighs only 1.4 kilogram. This paper illustrated the design scheme and analyzed the focusing error,which is 5.1 micrometer and meets the accuracy requirement. Besides,the modal analysis by finite element was carried out. The analysis results show that the structural stiffness is high enough and meets the requirement.

关 键 词：调焦机构 误差分析 模态分析 谐波齿轮减速器 

分 类 号：V447.3[航空宇航科学与技术—飞行器设计]