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Supervised by Ministry of Industry and Information Technology of The People''s Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Related citation:Wensheng Wang,Haojie Wei,Zhonghua Hou,Qun Mei,Yifan Li.Finite Element Model Updating of Complicated Beam-Type Structures Based on Reduced Super Beam Model[J].Journal of Harbin Institute Of Technology(New Series),2019,26(3):68-78.DOI:10.11916/j.issn.1005-9113.17088.
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Finite Element Model Updating of Complicated Beam-Type Structures Based on Reduced Super Beam Model
Wensheng Wang, Haojie Wei, Zhonghua Hou, Qun Mei,Yifan Li
(Department of Engineering Mechanics, Henan University of Science and Technology, Luoyang 471023,Henan, China)
Abstract:
A finite element model updating technique for complicated beam-type structures is presented in this study. Firstly, a complicated beam-type structure is reduced to a reduced super beam model with a much smaller degree of freedom by using the reduced super beam method, which is based on the classic plane cross-section assumption and displacement interpolation function of beam theory. Then based on the reduced super beam, the analysis of eigensolutions and eigensensitivities from the reduced eigenequation are processed for model updating, which will greatly reduce the computational effort when compared to the traditional model updating methods performed on the global model. Optimization techniques are adopted for updating the difference of modal dynamic properties, resulting in optimal values of the structural parameters. Finally, a complicated stiffened cylindrical shell model and a practical missile structure, served as the illustrative examples, are employed for model updating application, which demonstrate that the reduced super beam-based method is both effective and highly efficient.
Key words:  reduced super beam method  model updating  complicated beam-type structures  eigensolution  eigensensitivity
DOI:10.11916/j.issn.1005-9113.17088
Clc Number:V214,V414
Fund:
Descriptions in Chinese:
  

基于超梁降阶模型的复杂梁式结构有限元模型修正

王文胜,魏豪杰,候中华,梅群,李一帆

(河南科技大学 工程力学系,河南 洛阳 471023)

摘要:

提出一种针对复杂梁式结构的有限元模型修正方法。首先采用建立在经典梁理论中的平面截面假设和位移插值函数的超梁降阶模型方法,将复杂的梁式结构简化为具有较少自由度的超梁降阶模型。在此基础上,模型修正过程中所需要的特征值求解和特征灵敏度分析是在降阶后的小规模矩阵上进行,与传统基于全结构的模型修正方法相比,大大减少计算量。采用优化技术实现结构模态特性差异的修正,从而获得结构参数的最优值。最后以复杂加筋圆柱壳模型和一实际导弹结构的模型修正为例,证明了基于超梁降阶模型的有限元模型修正方法的有效性和高效性。

关键词:超梁降阶模型方法,模型修正,复杂梁式结构,特征方程,特征灵敏度

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