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Proceedings Paper

Bimodal warped frequency transform (BWFT) for guided wave mode conversion characterization
Author(s): Emanuele Baravelli; Luca De Marchi; Nicolò Speciale; Massimo Ruzzene
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Paper Abstract

Dispersive and multimodal guided wave propagation environments are often avoided in Structural Health Monitoring (SHM) applications by single mode selection through narrowband excitation and wavelength tuning. However, scatterer-induced mode conversions are relevant to damage localization and characterization. A Bimodal Warped Frequency Transform (BWFT) is proposed to track the time-frequency structure of propagating waves undergoing mode conversion in dual-mode environments. The BWFT provides a two-dimensional representation of a recorded time-trace in a modal distance vs. total distance domain. Consequent "modal path history" retrieval can effectively improve damage detection and characterization in broadband, multimodal regimes, as demonstrated both numerically and experimentally.

Paper Details

Date Published: 28 March 2012
PDF: 12 pages
Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 834803 (28 March 2012); doi: 10.1117/12.911974
Show Author Affiliations
Emanuele Baravelli, Georgia Institute of Technology (United States)
Luca De Marchi, Univ. degli Studi di Bologna (Italy)
Nicolò Speciale, Univ. degli Studi di Bologna (Italy)
Massimo Ruzzene, Georgia Institute of Technology (United States)

Published in SPIE Proceedings Vol. 8348:
Health Monitoring of Structural and Biological Systems 2012
Tribikram Kundu, Editor(s)

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