Experimental Broadband Signal Reconstruction for Plate-like Structures

Venturini, Nicolas (2020) Experimental Broadband Signal Reconstruction for Plate-like Structures. [Laurea magistrale], Università di Bologna, Corso di Studio in Aerospace engineering / ingegneria aerospaziale [LM-DM270] - Forli', Documento ad accesso riservato.
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Abstract

In the Structural Health Monitoring (SHM) field, the Acoustic Emission (AE) technique is a passive method by which damage is localized and identified by capturing Lamb Waves (LW) signals propagating in a plate-like structure. The reconstruction of emitted signals from damage at the source location constitutes one of the main challenges faced by the SHM community. Recently, the application of a Frequencies Compensation Transfer Function (FCTF) has been used to reconstruct narrowband and broadband signals through a hybrid experimental and numerical Time Reversal (TR) process on aluminum plates. This study aims to reconstruct through experimental methods different types of narrowband and broadband signals on different plate-like structures making use of FCTF. In particular, Hanning Window (HW) and numerical broadband signals have been reconstructed for aluminum and steel plates. The results obtained in this study show how the FCTF method can be applied to different types of materials in plate-like structures. Moreover, the FCTF method has been applied on real broadband signals emitted by the Pencil Lead Break (PLB) technique and Rock Impact (RI) test. These last results prove that the FCTF method is able to compensate for the frequency changes on a single wave packet. Such results are fundamental, as they open the possibility to reconstruct any type of source signals emitted by any damage type.

Abstract
Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Venturini, Nicolas
Relatore della tesi
Correlatore della tesi
Scuola
Corso di studio
Ordinamento Cds
DM270
Parole chiave
Acoustic emission, structural health monitoring, lamb waves, time reversal, frequencies compensation transfer function, Hanning window, pencil lead breaks, rock impact, experimental signal reconstruction
Data di discussione della Tesi
19 Marzo 2020
URI

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