基于不同残差的动态有限元模型修正的比较研究

基于模态试验结果的设计参数型动态有限元模型修正方法,较多地采用模态频率、反共振频率、模态振型以及振型相关系数等参数。分析了以上四种参数用于模型修正的优缺点,采用欧洲航空科技组织的基准模型- GARTEUR飞机模型,通过数值仿真对利用模态频率、模态频率加反共振频率、模态频率加振型以及模态频率加振型相关系数等不同残差的修正进行了比较研究。结果表明,模态频率与反共振频率是优选的两种参数。

EVALUATION OF FE MODEL UPDATING USING FOUR KINDS OF RESIDUES

Finite element model updating based on design parameters utilizes kinds of information from modal test.Among them,modal frequencies,anti-resonant frequencies,mode shapes and modal assurance criterion are frequently used.This paper summarizes advantages and disadvantages of these four parameters.GARTEUR aircraft model,which is the benchmark of Enropean academia,is employed in the numerical simulation.Altogether,four kinds of residues are used to update FE model of GARTEUR.Three of them are combined residues.Updating rsults show that modal frequencies and anti-resonant frequencies are preferential.