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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第5期    总第309期    2020年5月

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文章编号:1672-7207(2020)05-1228-06
基于多响应频响函数的加筋壁板结构模型修正
展铭1,郭勤涛1,岳林1,张保强2

(1. 南京航空航天大学 机电学院,江苏 南京,210016;
2. 厦门大学 航空航天学院,福建 厦门,361005
)

摘 要: 针对有限元模型中结构特征的简化以及连接界面的处理给分析结果引入的误差,提出一种基于多响应频响函数的模型修正方法。简要介绍基于频响函数模型修正的基本原理,并以复杂加筋壁板结构为对象进行实例研究。首先,建立加筋壁板的各子结构模型,并采用连接单元将子结构模型组装成整体结构模型。其次,对加筋壁板结构进行动态测试与分析,根据对应的试验结果对模型中的材料参数、连接参数以及模态阻尼比进行修正。最后,分别对比修正前后结构的模态频率、频响函数,检验修正后模型的精度。研究结果表明:经过修正后的加筋壁板结构能复现用于修正的多响应频响函数,得到1个能同时反映结构加速度和应变特性的模型,从而验证了所提方法的有效性。

 

关键字: 加筋壁板;模型修正;频响函数;多响应

Finite element model updating of stiffened structure based on multi frequency response functions
ZHAN Ming1, GUO Qintao1, YUE Lin1, ZHANG Baoqiang2

1. College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. School of Aerospace Engineering, Xiamen University, Xiamen 361005, China

Abstract: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.

 

Key words: stiffened structure; model updating; frequency response function; multi response

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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