高分辨光学卫星飞轮微振动隔振器的设计  

Design of Micro-vibration Isolators of Flywheels of High Resolution Optic Satellites

作　　者：杨睿 王栋 谷松 陈善搏 YANG Rui;WANG Dong;GU Song;CHEN Shanbo(Changchun Institute of Optics,Fine Mechanics and Physics,University of Chinese Academy of Sciences,Changchun 130033,China;Chang Guang Satellite Technology Co.Ltd.,Changchun 130033,China)

机构地区：[1]中国科学院大学长春光学精密仪器与物理研究所,长春130033 [2]长光卫星技术有限公司,长春130033

出　　处：《噪声与振动控制》2018年第6期178-183,共6页Noise and Vibration Control

摘　　要：反作用飞轮产生的微振动使高分辨光学卫星成像变得模糊,甚至导致高分辨光学卫星无法对地成像。为减弱飞轮微振动对成像的影响,采用金属橡胶隔振器隔离飞轮产生的微振动。首先,测量飞轮产生的微振动并分析其频谱特性;然后,利用有限元软件对"吉林一号高分星"进行频率响应分析,以获得相机内部光学元器件的敏感频率点;最后,将光学元器件的敏感频率点及飞轮振动频谱特性作为设计金属橡胶隔振器固有频率及阻尼比的依据。成型后的金属橡胶隔振器轴、径向固有频率分别为155 Hz、160 Hz,安装金属橡胶隔振后飞轮在249 Hz(共振峰值频率)处的隔振效率达80%。隔振前卫星次镜X、Y、Z向最大角位移为0.011″(249 Hz/2 800 r?min^(-1))、0.01″(249 Hz/2 800 r?min^(-1))、0.023″(249 Hz/1600 r?min^(-1)),隔振后最大角位移为0.002 2″(155 Hz/1 600 r?min^(-1))、0.002 2″(155 Hz/1 600 r?min^(-1))、0.001 2″(160 Hz/1 600 r?min^(-1)),与无隔振条件下相比角位移峰值减小达70%,满足次镜三向最大角位移小于0.008″的设计要求,表明金属橡胶隔振器设计合理,隔振效果明显。Disturbance of reactive flywheels can blur the imaging for high-resolution optical cameras, even lead to ground imaging failure for high-resolution optical satellites. In this paper, a metal rubber isolator is designed to isolate the micro-vibration of the flywheel to reduce the influence of the micro-vibration on the ground imaging. First of all, the micro- vibration induced by the reaction flywheel is measured and its spectral characteristics are analyzed. Then, the finite element software is used to analyze the frequency response of ＂Jilin No. 1 high-resolution satellite＂ to obtain the sensitive frequency points of the optical components inside the camera. Finally, the sensitive frequencies of the optical components and the vibration frequency spectrum of the reaction flywheel are taken as the reference to design the natural frequency and damping ratio of the metal rubber vibration isolator. The longitudinal and radial natural frequencies of the prepared metal rubber vibration isolator are 155 Hz and 160 Hz respectively. After the installation of the metal rubber vibration isolator, the vibration isolation efficiency at 249 Hz frequency （the resonance peak frequency） is up to 80 %. The maximum angular displacements of the secondary mirror of the satellite without installation of the vibration isolator are 0.011 ＂（249 Hz/2 800 r·min^-1）, 0.01＂（249 Hz/2 800 r·min^-1） and 0.023＂（249 Hz/1 600 r·min^-1） respectively in the X-Y-and Z-directions, while they become 0.002 2＂（155 Hz/1 600 r·min^-1）, 0.002 2＂（155 Hz/1 600 r·min^-1） and 0.001 2＂（249 Hz/1 600 r·min^-1） respectively after the vibration isolator is installed. It means that the angular displacement peaks are reduced by 70 % when the vibration isolator is installed. This result satisfies the requirement that the maximum angle displacement should be below 0.008＂. So, the design of the metal rubber vibration isolator is reasonable and its vibration isolation effect is obvious.

关 键 词：振动与波 反作用飞轮隔振 飞轮扰振测量 整星频率响应分析 金属橡胶隔振器设计 

分 类 号：O328[理学—一般力学与力学基础]