APPROACH OF DAMAGE IDENTIFICATION BASED ON STIFINESS CHANGE RATIO BY NEUMANN SERIES EXPANSION

LIU TieJun; ZHAO Xiang; WANG FengHui

doi:10.16579/j.issn.1001.9669.2017.03.035

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APPROACH OF DAMAGE IDENTIFICATION BASED ON STIFINESS CHANGE RATIO BY NEUMANN SERIES EXPANSION

更新时间：2022-09-22

- APPROACH OF DAMAGE IDENTIFICATION BASED ON STIFINESS CHANGE RATIO BY NEUMANN SERIES EXPANSION
- Journal of Mechanical Strength Vol. 39, Issue 3, Pages: 702-706(2017)
- 作者机构：
  
  1. 西北工业大学力学与土木建筑学院
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2017.03.035
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LIU TieJun, ZHAO Xiang, WANG FengHui. APPROACH OF DAMAGE IDENTIFICATION BASED ON STIFINESS CHANGE RATIO BY NEUMANN SERIES EXPANSION. [J]. 39(3):702-706(2017)
DOI：

LIU TieJun, ZHAO Xiang, WANG FengHui. APPROACH OF DAMAGE IDENTIFICATION BASED ON STIFINESS CHANGE RATIO BY NEUMANN SERIES EXPANSION. [J]. 39(3):702-706(2017) DOI： 10.16579/j.issn.1001.9669.2017.03.035.

摘要

提出了一种用于工程损伤识别的刚度变化率方法。通过Neumann级数展开导出了损伤结构刚度相对变化率矩阵,将损伤位置的刚度损失视为附加的虚拟刚度,由刚度变化率的矩阵变换即可得到损伤程度的估计,该方法具有简洁的表达形式和较高的计算效率。通过三维机翼刚架模型的仿真算例对该方法进行了验证,结果表明,利用少数低阶模态即可得到损伤程度的准确估计,不同噪声水平下识别结果相对稳定。

Abstract

A direct solution procedure for structural damage identification based on stiffness change ratio was proposed.Utilized with Neumann series expansion,the damaged structural stiffness change ratio matrix was derived,in a form of matrix product. The stiffness loss of the damaged element was treated as accessional dummy stiffness,and then the extent of element damage obtained by transformations of stiffness change ratio matrix. The method contributes a concise expression and higher computational efficiency. Numerical simulation example of a 3D aircraft wing frame model was performed via the proposed method,and the influence of test noise and incomplete test modal was considered,the results show that the identified values are accurate and stable.

关键词

损伤识别损伤指标模态柔度Neumann级数展开

Keywords

Damage identificationDamage indexModal flexibilityNeumann series expansion

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