IMPROVED CROSS-MODEL MODAL STRAIN ENERGY METHOD FOR STRUCTURAL DAMAGE LOCALIZATION

ZHANG YaRu; MA Jun; WU XiaoShun

doi:10.16579/j.issn.1001.9669.2024.02.032

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IMPROVED CROSS-MODEL MODAL STRAIN ENERGY METHOD FOR STRUCTURAL DAMAGE LOCALIZATION

更新时间：2024-07-05

- IMPROVED CROSS-MODEL MODAL STRAIN ENERGY METHOD FOR STRUCTURAL DAMAGE LOCALIZATION
- Journal of Mechanical Strength Vol. 46, Issue 2, Pages: 503-508(2024)
- 作者机构：
  
  1. 江西理工大学土木与测绘工程学院,南昌
  2. 南昌市虚拟数字工程与文化传播重点实验室
- 作者简介：
- 基金信息：
  
  The project supported by the Natural Science Foundation of Jiangxi Province (No. 20202BAB204028), and the National Natural Science Foundation of China (No.51868026).
- DOI：10.16579/j.issn.1001.9669.2024.02.032
  CLC： O327;O329;TU311
- Published：15 April 2024，
- 稿件说明：
移动端阅览
ZHANG YaRu, MA Jun, WU XiaoShun. IMPROVED CROSS-MODEL MODAL STRAIN ENERGY METHOD FOR STRUCTURAL DAMAGE LOCALIZATION. [J]. Journal of Mechanical Strength , 2024,46(2):503-508.
DOI：

ZHANG YaRu, MA Jun, WU XiaoShun. IMPROVED CROSS-MODEL MODAL STRAIN ENERGY METHOD FOR STRUCTURAL DAMAGE LOCALIZATION. [J]. Journal of Mechanical Strength , 2024,46(2):503-508. DOI： 10.16579/j.issn.1001.9669.2024.02.032.

摘要

为了提高结构损伤定位的精度，提出将跨模型模态应变能与小波分析（Wavelet Analysis，WA）相结合的结构损伤定位方法。首先，计算所有单元的跨模型模态应变能指标。其次，对由各单元跨模型模态应变能指标构成的序列进行小波分析，提取高频细节系数后对其进行重构，以得到改进的损伤指标。最后，根据改进指标判断损伤位置。以某平面桁架为例并考虑5%噪声水平进行蒙特卡洛分析。结果表明，改进指标抵抗噪声干扰的鲁棒性更强，能更好地指示损伤位置。

Abstract

In order to improve the accuracy of structural damage localization

a method to locate structural damages is proposed by combining the cross-model modal strain energy and the wavelet analysis(WA). Firstly

indices based on cross-modelmodal strain energy of all elements have been calculated. Secondly

the wavelet analysis is conducted on the sequence composed of the calculated indices of all elements

with high-frequency detail coefficients extracted to form the improved damage index. Finally

damage locations are judged according to the improved index. A planar truss is taken as the numerical example

with the Monte Carlo analysis carried out in consideration of 5% noise level. The result shows that the improved index is more robust to resist noise interference and can better indicate damage locations.

关键词

损伤定位模态应变能小波分析结构健康监测模态识别

Keywords

Damage localizationModal strain energyWavelet analysisStructural health monitoringModal identification

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