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Proceedings Paper

Integrated impedance and guided wave based damage detection under temperature variation
Author(s): Yun-Kyu An; Hoon Sohn
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Paper Abstract

Electro-mechanical impedances and guided waves have been widely studied for detecting localized structural damages due to their sensitivity to small structural changes. In this paper, an integrated impedance and guided wave (IIG) based monitoring system is developed to improve the detectability of various damage types under varying temperature. First, a hardware system, called the IIG system, was designed to achieve simultaneous measurements of electro-mechanical impedance and guided wave signals. Then, the effects of temperature on guided waves and electro-mechanical impedances were compensated using the passive imaginary part of the impedance signal. Finally, an automated damage classification algorithm which incorporates temperature compensation was developed. To validate the proposed algorithm, experimental investigations were performed for the detection of bolt loosening and crack in metallic structures subjected to the temperature varying condition, in the range of -20 to 70°C.

Paper Details

Date Published: 13 April 2011
PDF: 12 pages
Proc. SPIE 7981, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011, 79811Q (13 April 2011); doi: 10.1117/12.880753
Show Author Affiliations
Yun-Kyu An, KAIST (Korea, Republic of)
Hoon Sohn, KAIST (Korea, Republic of)

Published in SPIE Proceedings Vol. 7981:
Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2011
Masayoshi Tomizuka, Editor(s)

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