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TECHNICAL PAPERS

Piezoelectric Active Sensor Self-Diagnostics Using Electrical Admittance Measurements

[+] Author and Article Information
Gyuhae Park

Engineering Sciences & Applications, The Engineering Institute, Los Alamos National Laboratory, Los Alamos, NM 87545gpark@lanl.gov

Charles R. Farrar

Engineering Sciences & Applications, The Engineering Institute, Los Alamos National Laboratory, Los Alamos, NM 87545farrar@lanl.gov

Amanda C. Rutherford

Engineering Sciences & Applications, The Engineering Institute, Los Alamos National Laboratory, Los Alamos, NM 87545mandyr@lanl.gov

Amy N. Robertson

Engineering Sciences & Applications, The Engineering Institute, Los Alamos National Laboratory, Los Alamos, NM 87545arobertson@hytecinc.com

J. Vib. Acoust 128(4), 469-476 (Jan 24, 2006) (8 pages) doi:10.1115/1.2202157 History: Received November 19, 2004; Revised January 24, 2006

This paper presents a piezoelectric sensor self-diagnostic procedure that performs in situ monitoring of the operational status of piezoelectric materials used for sensors and actuators in structural health monitoring (SHM) applications. The sensor/actuator self-diagnostic procedure, where the sensors/actuators are confirmed to be functioning properly during operation, is a critical component to successfully complete the SHM process with large numbers of active sensors typically installed in a structure. The premise of this procedure is to track the changes in the capacitive value of piezoelectric materials resulting from the degradation of the mechanical/electrical properties and its attachment to a host structure, which is manifested in the imaginary part of the measured electrical admittances. This paper concludes with an experimental example to demonstrate the feasibility of the proposed procedure.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Electrical admittance measurement from PZT patches under free and surface-bonded conditions

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Figure 2

The composite plate used for the test

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Figure 3

Diagram of PZT circuit indicating locations of measured voltages Vin and Vout

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Figure 4

Locations of MFC/PZT sensors and the impact

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Figure 5

Base line admittance measurements from PZT patches. Total of 14 measurements are shown.

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Figure 6

Base lines and impact responses from PZT 1

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Figure 7

Delamination induced by Impact 2

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Figure 8

The failure of PZT sensor after Impact 5

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Figure 9

Base lines and Impact responses from PZT 2

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Figure 10

Superposed base lines and impact responses from MFCs

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