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An integrated active sensing system for damage identifcation and prognosis [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2004.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
11 pages : digital, PDF file
Additional Creators
Los Alamos National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
This paper illustrates an integrated approach for identifying structural damage. Two damage identification techniques, Lamb wave propagation and impedance-based methods, are investigated utilizing piezoelectric (PZT) actuators/sensors. The Lamb wave propagation and the impedance methods operate in high frequency ranges (typically > 30 kHz) at which there are measurable changes in structural responses even for incipient damage such as small cracks, debonding, delamination, and loose connections. In Lamb wave propagation, one PZT is used to launch an elastic wave through the structure, and responses are measured by an array of sensors. The technique used for the Lamb wave propagation method looks for the possibility of damage by tracking changes in transmission velocity and wave attenuation/reflections. Experimental results show that this method works well for surface anomalies. The impedance method monitors the variations in structural mechanical impedance, which is coupled with the electrical impedance of the PZT. Through monitoring the measured electrical impedance and comparing it to a baseline measurement, a decision can be made about whether or not structural damage has occurred or is imminent. In addition, significant advances have been made recently by incorporating advanced statistic-based signal processing techniques into the impedance methods. To date, several sets of experiments have been conducted on a cantilevered aluminum plate and composite plate to demonstrate the feasibility of this combined active sensing technology.
Report Numbers
E 1.99:la-ur-04-2452
la-ur-04-2452
Subject(s)
Note
Published through SciTech Connect.
01/01/2004.
"la-ur-04-2452"
Submitted to: 45th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics&Materials Conference, Palm Springs, CA, April 19-22, 2004.
Wait, J. R. (Jeannette R.); Park, G. H. (Gyu Hae); Sohn, H. (Hoon); Farrar, C. R. (Charles R.).
View MARC record | catkey: 24505462