机载摆扫式光谱仪高转速三面摆镜设计与优化  

Design and optimization of high-speed swing mirror with three reflectors on airborne whiskbroom scanning spectrometer

作　　者：李颐[1,2] 刘伟 谭亚雄[3,4] 张晓辉 颜昌翔[1] LI Yi;LIU Wei;TAN Ya-xiong;ZHANG Xiao-hui;YAN Chang-xiang(Changchun Institute of Optics, Fine Mechanics and Physics,Chinese Academy of Sciences, Changchun 130033, China;University of Chinese Academy of Sciences, Beijing 100049, China;Beijing Aerospace Automatic Control Institute, Beijing 100854, China;National Key Laboratory on Aerospace Intelligent Control, Beijing 100854, China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049 [3]北京航天自动控制研究所,北京100854 [4]宇航智能控制技术国防科技重点实验室,北京100854

出　　处：《光学精密工程》2018年第11期2675-2683,共9页Optics and Precision Engineering

基　　金：国家重点研发计划资助项目(No.2016YFF0103603)

摘　　要：为满足机载摆扫式光谱仪在25Hz扫描频率下工作的要求,设计了具有三面反射镜的摆镜结构。首先,计算镜面反射区域面积与旋转轴偏离量的关系,通过比较摆镜布置不同数目反射镜时的性能,设计了围绕旋转轴布置三面反射镜的摆镜结构形式,通过600r/min的转速即可完成每分钟1 800次的高频摆扫;同时采用匀速摆扫的运动方式,降低了摆镜的控制难度,提高了系统的稳定性。然后,采用拓扑优化、集成优化等方法对摆镜结构进行了优化,摆镜最终质量为5.28kg,轻量化率达到58%。最后,通过有限元仿真计算得到:摆镜在机载平台600r/min转速离心力与1 g重力的作用下,面型精度RMS值优于λ/20,基频达到1 199Hz,具有较高的力学稳定性,满足机载摆扫式光谱仪的高扫描频率要求。Aiming at fulfilling the requirement of 25Hz high scanning frequency of the airborne whiskbroom scanning spectrometer,a swing mirror with three reflectors is designed.Firstly,by revealing the relationship between the reflection area and the deviation of the rotation axis and comparing performance of several swing mirrors with the different numbers of reflectors.The arrangement of three reflectors around the rotation axis of swing mirror was adopted.Thus rotating at a speed of 600r/min the mirror was able to achieve 1800 scans within a single minute.At the same time,the swing mirror used uniform rotation to reduce the difficulty in controlling and improve the stability of the sweep-scanning system.Through topology optimization and integrated optimization,the weight of the swing mirror was reduced to 5.28kg and the lightweight ratio was58%.Finally,calculated by the finite element simulation,the RMS of the reflector was better than λ/20in1g gravity and centrifugal force at600r/min rotate speed environment and the fundamental frequency is1199Hz.This verifies that the swing mirror is of high mechanical stability.It can satisfy the higher scanning frequency requirement of airborne whiskbroom scanning spectrometer.

关 键 词：机载摆扫式光谱仪 高转速 匀速摆扫 三面反射镜 

分 类 号：TH703[机械工程—仪器科学与技术] TH744.1[机械工程—精密仪器及机械]