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Proceedings Paper

Temperature-independent localization algorithm using guided wave interrogation methods
Author(s): Kevin Hensberry; Narayan Kovvali; Aditi Chattopadhyay
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Paper Abstract

This paper examines the current challenges of using Lamb wave interrogation methods to localize fatigue crack damage in a complex metallic structural component in the presence of temperature variations. The goal of this research is to improve damage localization results for a structural component interrogated at an unknown temperature by developing a probabilistic and reference-free framework for estimating Lamb wave velocities. The proposed approach for temperature-independent damage localization involves a model that can describe the change in Lamb wave velocities with temperature, the use of advanced time-frequency based signal processing for damage feature extraction, estimation of the actual Lamb wave velocities from transducer signals, and a Bayesian damage localization framework with data association and sensor fusion. The technique does not require any additional transducers on a component and allows the estimation of the velocities for the actual Lamb waves present in a component. Experiments to validate the proposed method were conducted using an aluminum lug joint interrogated with piezoelectric transducers for a range of temperatures and fatigue crack lengths. Experimental results show the advantages of using a velocity estimation algorithm to improve damage localization for a component interrogated at both known and unknown temperatures.

Paper Details

Date Published: 17 April 2013
PDF: 15 pages
Proc. SPIE 8695, Health Monitoring of Structural and Biological Systems 2013, 86952A (17 April 2013); doi: 10.1117/12.2009885
Show Author Affiliations
Kevin Hensberry, Arizona State Univ. (United States)
Narayan Kovvali, Arizona State Univ. (United States)
Aditi Chattopadhyay, Arizona State Univ. (United States)

Published in SPIE Proceedings Vol. 8695:
Health Monitoring of Structural and Biological Systems 2013
Tribikram Kundu, Editor(s)

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