New damage detection and localization strategy from numerical library

Juan Pablo PIATTI a b , Roger SERRA a, Guillaume GAUTIER a , Serge DOS SANTOS a

a INSA Centre Val de Loire, France b Universidad Nacional de Rosario FCEIA, Argentina

Tolerance

Experimental Damaged

Beam Detected ?

Indicators Analysis

Experimental Simulation

Comparison

NO

YES New Test

Position Level Type

Geometry

Experimental Safe Beam

3D Model Updated 2D Model Updated

YES YES

NO NO

Mo

dif

y E

Mo

dif

y E

Updating Updating

E / Geometry

Correlation

COMSOL 3D Model

MATLAB 2D Model

Damage Geometry Simulation

E Reduction Simulation

Damage Library

Context Year on year the number of accidents of airplanes decrease, but we must work to finish it. The airplanes are constituted of beams structures, so we study the behavior of them.

Problematic There are a lot of Non-Destructive Tests, but not always give good results. Levels of the “Vibration Based Structural Health Monitoring” are: 1. Detection of damage : inspection of the presence of damages in the structure. 2. Localization of damage : determination of the place where the damage is

located. 3. Estimation of the severity of damage. 4. Prediction of the residual life of the structure.

Objective Development the method of the Damage Library, where it use the frequency response to find:

• Position • Level • Type • Geometry

Methodology

Library Development

Experimental Validation Results Indicators: So we see that the indicators indicate, there is a damage and its location is placed between 25 cm and 45 cm from the fixed end of the beam. Library: In less than a second good results are obtained:

LFCR Only Numerical

Conclusions

• Indicators + Damage Library = Good Results • 3D Model too slow • Need a finer mesh

(2D Model Time = 1492 s)

(3D Model Time = 28226 s)

Bibliography 1. Javier Adad Blasco, Miguel García Garcés, Luis Lezáun Martínez de

Ubago, Francisco Martínez Gomez, “Detección de defectos en ensambles mediante técnicas de análisis modal”

2. Oscar Ángulo, Eduardo Puerta, César Gutiérrez, “Guía rápida de MATLAB” 3. Alberto Renán Ancona Lazcano, Rolando Salgado Estrada, Sergio Aurelio

Zamora Castro, Fernando Marcial Martinez, “Evaluación de métodos de detección de daños en estructuras mediante el uso de vibraciones”

4. Ricardo Barrios D’Ambra, Graciela Doz, Ignacio Iturrioz, “Damage detection in structures using dynamic properties”

5. G. Gautier, R. Serra, J.-M. Mencik, “A subspace fitting method based on finite elements for fast identification of damages in vibrating mechanical systems”

6. M. Radziénski, M. Krawczuk, “Experimental verification and comparison of mode shape-based damage detection methods”

7. Paulo J.S. Cruz, Dan M. Frangopol, Luis C. Neves, “Bridge maintenance, Safety, Management, Life-cicle performance cost”

8. F.C. Choi, J.Li, B. Samali, K. Crews, “Application of the modified damage index method to timber beams”

9. G. Gautier, R. Serra, J.-M. Mencik, “A finite element based subspace fitting approach for structure identification and damage localization”

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