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Proceedings Paper

Frequency domain reference-free crack detection using transfer impedances in plate structures
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Paper Abstract

A new concept of reference-free damage detection methodology is developed using transfer impedances to detect crack damage in a plate-like structure without using previously collected baseline data. Conventional impedance-based damage detection techniques have been shown to be vulnerable to other types of changes such as temperature variation that may not be relevant to defects of interest. One of potential disadvantages of the conventional techniques is frequent falsealarms due to these undesirable variations that may occur particularly for field applications. In order to reduce these false-alarms, this paper proposes a new methodology that utilizes transfer impedances obtained between two pairs of collocated PZT patches instead of the electromechanical impedance obtained at one PZT patch. The proposed technique seeks Lamb mode conversion effects caused by the presence of crack damage in plate structures. Furthermore, an instantaneous damage classification is carried out by comparing mode conversion energy among several combinations of measured signals without any user-specified threshold or relying on the baseline data. The feasibility of the proposed reference-free methodology using transfer impedances is investigated via a series of experiments conducted on an aluminum plate.

Paper Details

Date Published: 8 April 2009
PDF: 12 pages
Proc. SPIE 7295, Health Monitoring of Structural and Biological Systems 2009, 72951B (8 April 2009); doi: 10.1117/12.815432
Show Author Affiliations
Seunghee Park, Sungkyunkwan Univ. (Korea, Republic of)
Changgil Lee, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Hoon Sohn, Korea Advanced Institute of Science and Technology (Korea, Republic of)

Published in SPIE Proceedings Vol. 7295:
Health Monitoring of Structural and Biological Systems 2009
Tribikram Kundu, Editor(s)

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