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第 24卷第 5期机械科学与技术 Vol. 24 No. 5
2005年 5月 MECHAN ICAL SC IENCE AND TECHNOLOGY May 2005
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文章编号: 1003 8728 (2005) 05 0543 03
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相机结构系统的试验模态分析
徐金锁,任兴民,范春虎
(西北工业大学振动工程研究所,西安 710072)
徐金锁
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摘要:介绍了锤击法试验模态分析技术在某卫星相机光机结构系统动态特性研究中的应用;阐述了多自由度系统
模态分析的理论基础和模态参数识别原理;测量分析得到了相机整机结构和关键部件的固有频率,以及与之相对应
的模态振型和模态阻尼,并对模态数据及其可能对相机工作的影响作了分析,在此基础上,给出了相机强度和振动
试验的载荷谱,保证了试验的安全顺利进行;最后就相机结构设计问题作了讨论。
关键词:相机;模态分析;锤击法;结构设计
中图分类号: TB123 文献标识码: A
Exper im en ta lM oda l Ana lysis of a Space Cam era Structure
XU J in suo, REN Xing m in, FAN Chun hu
( Institute of V ibration Engineering, Northwestern Polytechnical University, Xi′an 710072)
Abstract: In this paper, app lication of experimentalmodal analysis of structure system for a satellite cam
era by impact method is introduced. The theoretical basis of modal analysis formultip le degree of freedom
system and the p rincip le of identifying modal parameters are exp ressed. The natural frequencies, natural
vibration modes and damp ing ratios are measured and some most important modal parameters are studied
which may affect the camera′s working status. The load spectrum of the strength and vibration testing is
given which can ensure the experiment′s safety. Finally, the structural design of the camera is discussed.
Key words: Camera; Modal analysis; Impact method; Structural design
试验