Paper Title:

A Signal Processing Approach for Elastic Wave-Based Structural Health Monitoring Using Active Piezoelectrics

Periodical Key Engineering Materials (Volumes 334 - 335)
Main Theme Advances in Composite Materials and Structures
Edited by J.K. Kim, D.Z. Wo, L.M. Zhou, H.T. Huang, K.T. Lau and M. Wang
Pages 1141-1144
DOI 10.4028/
Citation Chun Hui Yang et al., 2007, Key Engineering Materials, 334-335, 1141
Online since March 2007
Authors Chun Hui Yang, Zhong Qing Su, Lin Ye, Li Min Zhou, Peter D. Hodgson
Keywords Damage Identification, Signal Processing, Structural Health Monitoring (SHM), Time-of-Flight (TOF), Wave Propagation, Wavelet Transform (WT)
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A series of digital frequency filters (DFFs) were designed to screen diverse noises and the spectrographic analysis was conducted to isolate complex boundary reflection, which obscures the damage-induced signals. The scale-averaged wavelet power (SAP) technique was applied to enhance the measurement accuracy of Time of Flight (TOF). As an example, the propagation characteristics of elastic wave in a structural beam of square cross-section were analyzed using such an approach and verified experimentally and numerically, with the consideration of the complicated wave scatter caused by the non-ignorable section dimensions.