基于振動試驗數(shù)據(jù)的有限元模型修正技術(shù)研究

A method to update FEA analytical model by using the shaker vibration test data

摘要: 文章針對航天器結(jié)構(gòu)的有限元模型修正問題，提出利用振動試驗數(shù)據(jù)對模型進行修正的方法,。詳細闡述了基于基礎(chǔ)激勵傳遞特性的模型修正方法的理論公式,，對此方法的程序?qū)崿F(xiàn)思路及修正程序與有限元分析軟件NASTRAN的接口方式進行了詳細的介紹。最后利用復(fù)雜桁架模型進行了仿真分析，初步驗證了該方法的可行性,。

Abstract: This paper presents a new model updating method to update aerospace structures by using measured response function data under the base excitation directly. The updating equation is derived and a structural updating software system is developed based on the commercial FEA software NASTRAN. Through simulated numerical case studies based on two models, it is shown that the proposed method is feasible and effective, and the method can be used in virtual tests.