Principal component analysis and perturbation theory-based robust damage detection of multifunctional aircraft structure

Rafik Hajrya (1) , Nazih Mechbal (1)

1 PIMM - Laboratoire Procédés et Ingénierie en Mécanique et Matériaux

A fundamental problem in structural damage detection is to define an efficient feature to calculate a damage index. Furthermore, due to perturbations from various sources, we also need to define a rigorous threshold whose overtaking indicates the presence of damages. In this article, we develop a robust damage detection methodology based on principal component analysis. We first present an original damage index based on projection of the separation matrix, and then, we drive a novel adaptive threshold that does not rely on statistical assumptions. This threshold is analytic, and it is based on matrix perturbation theory. The efficiency of the method is illustrated using simulations of a composite smart structure and experimental results performed on a conformal load-bearing antenna structure laboratory test.

Mots clés: Damage detection; blind source separation; principal component analysis; information theory; angle between subspaces; matrix perturbation theory; analytic bound; robustness; conformal load-bearing antenna structure; temperature effect

Domaines: Mécanique [physics.med-ph]; Mécanique des structures [physics.class-ph]; Mécanique des structures [physics.class-ph]

Rafik Hajrya, Nazih Mechbal. Principal component analysis and perturbation theory-based robust damage detection of multifunctional aircraft structure. Structural Health Monitoring, 2013, 12( (3), pp.263-277. ⟨10.1177/1475921713481015⟩. ⟨hal-00997044⟩