Finite element model updating of stiffened structure based on multi frequency response functions

被引：0
|
作者：
Zhan M. [1 ]
Guo Q. [1 ]
Yue L. [1 ]
Zhang B. [2 ]
机构：
[1] College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing
[2] School of Aerospace Engineering, Xiamen University, Xiamen
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2020年 / 51卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Frequency response function; Model updating; Multi response; Stiffened structure;
D O I：
10.11817/j.issn.1672-7207.2020.05.007
中图分类号：
学科分类号：
摘要：
In view of the errors caused by the simplification of structural features and treatment of joint interfaces in the modeling phase, a finite element model updating method based on multi frequency response functions was proposed. The basic principle of model updating based on frequency response function was introduced and a case study of complex stiffened structure was carried out. The stiffened structure was divided into several substructures and meshed sequentially, and then substructures were connected utilizing joint elements. Dynamic test was conducted and frequency response function of acceleration and strain was obtained. Model parameters such as material properties, joint characteristics and modal damping ratios were calibrated based on the experimental frequency response functions. In the end, modal frequencies, frequency response functions before and after updating were compared to verify the precision of updated model. The results show that the updated model can reproduce the multi frequency response functions used in the updating phase, and a model that can reflect acceleration and strain characteristics simultaneously is obtained. © 2020, Central South University Press. All right reserved.
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页码：1228 / 1233
页数：5
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