Characterization of the robustness of SHM imaging techniques using the absolute error of localization

Jérémy Moriot (1, 2) , Nicolas Quaegebeur (1) , Alain Le Duff (2) , Patrice Masson (1)

1 UdeS - Département de génie mécanique [Sherbrooke]
2 LAUM - Laboratoire d'Acoustique de l'Université du Mans

Guided waves-based imaging techniques have been studied for decades and have showed great potential for fast localization of defects on isotropic and anisotropic structures. In particular, pitch-catch techniques based on scattered waves allow inspection of large structures with a small number of actuators. In this paper, an approach is presented for characterizing the robustness of two imaging techniques for localizing a defect on an aluminium plate instrumented with three piezoelectric transducers, considering the absolute error of localization (AEL). This intuitive metric is useful for evaluating the probability of localization of a defect occurring on a structure where a critical zone is monitored. The robustness with respect to the distance between the transducers of the array and the level of noise in residual signals is studied. AEL values are mapped for several positions and sizes of the defect and a procedure for maximizing the ratio of correct localization over the grid is proposed.

Mots clés: Structural Health Monitoring; piezoelectric embedded sensors; guided waves; image processing; defect characterization; aerospace

Domaines: Vibrations [physics.class-ph]

Jérémy Moriot, Nicolas Quaegebeur, Alain Le Duff, Patrice Masson. Characterization of the robustness of SHM imaging techniques using the absolute error of localization. 8th European Workshop on Structural Health Monitoring, Jul 2016, Bilbao, Spain. ⟨hal-01359856⟩