空间太阳望远镜主桁架的模态分析与试验.pdf

文档介绍：第卷第期光电工程 ,
年月 Opto-Electronic Engineering Oct,2004
文章编号:1003-501X(2004)12-0001-03
空间太阳望远镜主桁架的模态分析与试验
陈志平 1,2,3, 陈志远 1, 杨世模 1
(1. 中国科学院国家天文台,北京;2. 杭州电子工业学院,浙江杭州;
3. 中国科学院研究生院,北京)
摘要:根据 1m 光学主镜支撑系统的特殊要求,提出了空间主桁架结构的模态分析与试验方案。
运用 软件计算求得前几阶固有频率和振型, 分析出结构存在局部模态。用自由悬
挂、单点激振多点拾振法进行模态试验,CADA-X 软件辨识模态参数, 结果验证了结构隐含的薄
弱环节。计算与试验得到的模态参数相对误差在 %内,说明模态分析与试验的方案可行。分析
了试验误差和结构产生缺陷的原因,为整星改进设计与光学装校提供可靠依据。
关键词:空间太阳望远镜;模态分析;模态试验;主桁架
中图分类号:TH753 文献标识码:A
Modal analysis and experiment on the main truss of Space Solar Telescope
CHEN Zhi-ping 1,2,3 ,CHEN Zhi-yuan 1 ,YANG Shi-mo1
(1. National Astronomical Observatories,the Chinese Academy of Sciences,Beijing 100012,China;
2. Hangzhou Institute of Electronics & Engineering,Hangzhou 310018,China;
3. Graduate School of the Chinese Academy of Sciences,Beijing 100039,China)
Abstract:A modal analysis and experimental scheme for main truss of Space Solar Telescope is
proposed according to the special demands of the supporting system for 1m Space Solar Telescope. The
local modality of the main truss is analyzed by obtaining the inherent frequency and vibration model of
the first several orders through calculation with software. Modal test is carried out by
means of free hanging, single vibration excitation and multiple-vibration picking up. The model
parameters are i