Parameter study for structural health monitoring based on ambient noise cross-correlation

Najib Abou Leyla (1, 2) , Emmanuel Moulin (1, 2) , Jamal Assaad (1, 2) , Sébastien Grondel (1, 2) , Christophe Delebarre (1, 2)

1 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
2 IEMN-DOAE - Institut d’Électronique, de Microélectronique et de Nanotechnologie - Département Opto-Acousto-Électronique - UMR 8520

The possibility of performing Structural Health Monitoring in aeronautic structures using ambient noise cross‐correlation techniques has been investigated in previous works. The applicability of such methods has been validated by checking the reproducibility and the potential in terms of damage detection. In this paper, a more detailed description of the acoustic phenomena involved is given. The influence of the different parameters (source characteristics, sensors and damage positions, etc.) on the cross‐correlation function has been studied. A theoretic study is presented and used to develop a simple simulation tool based on multipath reflections of ballistic waves. The simulated results have been successfully compared to finite element results in simple cases. This tool is then exploited to characterize and quantify the influence of the significant parameters. Finally, some optimization solutions of the technique are proposed, and experimentally validated

Domaines: Sciences de l'ingénieur [physics]

Najib Abou Leyla, Emmanuel Moulin, Jamal Assaad, Sébastien Grondel, Christophe Delebarre. Parameter study for structural health monitoring based on ambient noise cross-correlation. 157th Meeting of the Acoustical Society of America, May 2009, Portland, OR, United States. ⟨10.1121/1.4784067⟩. ⟨hal-00575756⟩