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2008年 6月现代防御技术 Jun. 2008
第 36卷第 3期 MOD ERN D EFEN C E TECHNOLO GY Vol. 36 No. 3
导弹技术
基于遗传算法的导弹结构模态参数识别
李静,金玉华
(中国航天科工集团二院二部,北京 100854)
摘要系统地研究了基于遗传算法的线性结构系统模态参数识别方法。遗传算法对广义动
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力学系统的辨识已经得到了充分研究,但在结构系统参数辨识方面的研究还不多,使用浮点数编码
方案,利用频响函数数据,给出了结构系统模态参数识别步骤。由于遗传算法的全局寻优特性,该
算法具有极强的抗噪声能力,即使对噪声严重污染的数据依然能够很好的辨识出待辨识的参数。
通过一个两自由度的弹簧质量块系统进行了仿真分析,最后将方法用于一个实际的导弹结构的实
验数据分析。
关键词:遗传算法;模态参数识别;导弹结构;频响函数
中图分类号: TJ760 3; TU31 文献标志码: A 文章编号: 1009 086X (2008) 03 0031 04
Applica tion of ic A lgor ithm in Structura lM oda l Param eter Iden tif ica tion
L I J ing, J IN Yu hua
( The Second System Design Department of the Second Research Academy of CASIC, Beijing 100854, China)
Abstract: The linear structure system modal parameters identification based on ic algorithm s is
studied. ic algorithm s has been well studied in generalization dynam ics system identification, but
less work has been done in the structural system identification. Therefore, based on floating point coding,
the step s of structural model parameter indentification using the frequency response data are given. Be
cause of the global op tim ization of ic algorithm s, the method has good quality of resisting noise. The
result is validated by simulating of a two degree of freedom mass sp ring system. Finally p roposed method
is used to identifying modal parameter of