Broadband signal reconstruction for SHM: An experimental and numerical time reversal methodology

Francesco Falcetelli*, Nicolas Venturini, Maria Barroso Romero, Marcias J. Martinez, Shashank Pant, Enrico Troiani

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
26 Downloads (Pure)

Abstract

Structural Health Monitoring (SHM) aims to shift aircraft maintenance from a time-based to a condition-based approach. Within all the SHM techniques, Acoustic Emission (AE) allows for the monitoring of large areas by analyzing Lamb waves propagating in plate like structures. In this study, the authors proposed a Time Reversal (TR) methodology with the aim of reconstructing an original and unaltered signal from an AE event. Although the TR method has been applied in Narrow-Band (NwB) signal reconstruction, it fails when a Broad-Band (BdB) signal, such as a real AE event, is present. Therefore, a novel methodology based on the use of a Frequencies Compensation Transfer Function (FCTF), which is capable of reconstructing both NwB and real BdB signals, is presented. The study was carried out experimentally using several sensor layouts and materials with two different AE sources: (i) a Numerically Built Broadband (NBB) signal, (ii) a Pencil Lead Break (PLB). The results were validated numerically using Abaqus/CAETM with the implementation of absorbing boundaries to minimize edge reflections.

Original languageEnglish
Pages (from-to)1043-1058
Number of pages16
JournalJournal of Intelligent Material Systems and Structures
Volume32
Issue number10
DOIs
Publication statusPublished - 2021

Keywords

  • acoustic emission
  • Lamb waves
  • piezoelectric transducer
  • Structural health monitoring
  • time reversal

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