Accuracy of Green's function estimation from correlation of diffuse elastic waves on thin plates - Université Paris Cité Accéder directement au contenu
Article Dans Une Revue Journal of the Acoustical Society of America Année : 2019

Accuracy of Green's function estimation from correlation of diffuse elastic waves on thin plates

Résumé

In a reverberant cavity, when a noise field is sufficiently diffuse, the correlation of the signal measured by two sensors provides an estimation of the Green's function (GF) between them. Here, the convergence of this passive estimation in the case of elastic waves on thin plates is studied. A statistical approach is proposed, which relates the similarity between the cross correlation and the GF to the structural properties of the plate and the number of uncorrelated sources. The analysis is sustained by experimental results obtained on an aluminum plate. This study allows us to evaluate the efficiency of passive structural health monitoring of plate-like structures based on noise correlation. Finally, a most interesting finding shows an absolute upper bound of the signal-to-noise ratio for GF quality reconstruction: 4Ns/5⁠, independently of the plate properties.
Fichier principal
Vignette du fichier
Chehami_2019_JAcoustSocAm_3505_1.pdf (1.33 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-02382833 , version 1 (20-07-2023)

Identifiants

Citer

Lynda Chehami, Emmanuel Moulin, Julien de Rosny, Claire Prada. Accuracy of Green's function estimation from correlation of diffuse elastic waves on thin plates. Journal of the Acoustical Society of America, 2019, 146 (5), pp.3505-3511. ⟨10.1121/1.5134066⟩. ⟨hal-02382833⟩
77 Consultations
14 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More