STRUCTURAL DAMAGE IDENTIFICATION BASED ON EEMD AND NORMALIZED ENERGY DIFFERENCE OF IMF

JI QunCe; HE XiaoHui; ZHANG MeiJun; ZHANG Yu

doi:10.16579/j.issn.1001.9669.2018.03.007

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STRUCTURAL DAMAGE IDENTIFICATION BASED ON EEMD AND NORMALIZED ENERGY DIFFERENCE OF IMF

更新时间：2022-09-22

- STRUCTURAL DAMAGE IDENTIFICATION BASED ON EEMD AND NORMALIZED ENERGY DIFFERENCE OF IMF
- Journal of Mechanical Strength Vol. 40, Issue 3, Pages: 545-551(2018)
- 作者机构：
  
  1. 解放军理工大学野战工程学院
  2. 成都军区善后办公室房管局
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2018.03.007
  CLC：
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JI QunCe, HE XiaoHui, ZHANG MeiJun, et al. STRUCTURAL DAMAGE IDENTIFICATION BASED ON EEMD AND NORMALIZED ENERGY DIFFERENCE OF IMF. [J]. 40(3):545-551(2018)
DOI：

JI QunCe, HE XiaoHui, ZHANG MeiJun, et al. STRUCTURAL DAMAGE IDENTIFICATION BASED ON EEMD AND NORMALIZED ENERGY DIFFERENCE OF IMF. [J]. 40(3):545-551(2018) DOI： 10.16579/j.issn.1001.9669.2018.03.007.

摘要

针对结构损伤受外界环境因素影响、损伤指标不敏感等导致的结构识别困难问题,提出了一种基于EEMD和归一化IMF能量差的结构损伤识别新方法。首先对各传感器采集到的原信号进行EEMD分解得到多个IMF分量,再对各测点分解后的IMF分量进行能量的计算并进行归一化处理,求出与未损伤前各测点IMF分量的归一化能量差值,以结构损伤前后信号的EEMD分解后的IMF分量归一化能量差值作为结构损伤敏感因子构建各状态下的变化曲线,直观的判断结构损伤的位置。对三层框架模型结构和简支梁结构进行分析,结果表明该方法可以准确判断结构损伤的发生。

Abstract

Aiming at the problem that the influence of environmental factors and insensitive damage indicators make structural damage identification difficult,a new method of structural damage identification based on EEMD and normalized energy difference of IMF was proposed. First,a group of IMF components of original signal was obtained by EEMD. The energy of IMF components of each measured point was calculated and normalized,The difference between the normalized energy of IMF components before and after damage was obtained. The change curve of each state was constructed by using the difference as the structural damage indicator and conclude the damage location and degree through comparing before and after structural damage.Finally,a series of the experimental data from a three-story building structure and simply supported beam were analyzed to validate the viewpoints in this paper. Results indicate that the method is effective.

关键词

EEMDIMF能量归一化能量差框架模型损伤识别

Keywords

EEMDEnergy of the IMFNormalized difference of energyFramework modelDamage identification

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