Bimodal warped frequency transform (BWFT) for guided wave mode conversion characterization

Emanuele Baravelli; Luca De Marchi; Nicolò Speciale; Massimo Ruzzene

doi:10.1117/12.911974

28 March 2012 Bimodal warped frequency transform (BWFT) for guided wave mode conversion characterization

Emanuele Baravelli, Luca De Marchi, Nicolò Speciale, Massimo Ruzzene

Proceedings Volume 8348, Health Monitoring of Structural and Biological Systems 2012; 834803 (2012) https://doi.org/10.1117/12.911974
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2012, San Diego, California, United States

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.

Citation Download Citation

Emanuele Baravelli, Luca De Marchi, Nicolò Speciale, and Massimo Ruzzene "Bimodal warped frequency transform (BWFT) for guided wave mode conversion characterization", Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 834803 (28 March 2012); https://doi.org/10.1117/12.911974

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