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Proceedings Paper

Experimental evaluation of instantaneous phase based index for structural health monitoring
Author(s): Ratneshwar Jha; Kevin Cross; Kerop Janoyan; Edward Sazonov; Michael Fuchs; Vidya Krishnamurthy
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Paper Abstract

The sensitivity and consistency of a damage index based on instantaneous phase values obtained through vibration measurements of a structure is investigated experimentally. An 'empirical mode decomposition' is performed to decompose structural vibrations into a small number of 'intrinsic mode functions' following the methodology generally known as the Hilbert-Huang Transform. Instantaneous phase information is derived through the Hilbert transform of intrinsic mode functions. The damage index is based on the idea that the difference in phase functions between any two points on a structure is altered if the structure is damaged. Experimental investigations are performed on a beam structure with varying excitations (white noise signals), damage levels, and damage locations. The damage index shows generally consistent results, but its sensitivity to damages needs improvements for practical applications.

Paper Details

Date Published: 5 April 2006
PDF: 8 pages
Proc. SPIE 6173, Smart Structures and Materials 2006: Smart Structures and Integrated Systems, 61731D (5 April 2006); doi: 10.1117/12.658730
Show Author Affiliations
Ratneshwar Jha, Clarkson Univ. (United States)
Kevin Cross, Clarkson Univ. (United States)
Kerop Janoyan, Clarkson Univ. (United States)
Edward Sazonov, Clarkson Univ. (United States)
Michael Fuchs, Clarkson Univ. (United States)
Vidya Krishnamurthy, Clarkson Univ. (United States)

Published in SPIE Proceedings Vol. 6173:
Smart Structures and Materials 2006: Smart Structures and Integrated Systems
Yuji Matsuzaki, Editor(s)

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