Embedded Self-Sensing Piezoelectric Active Sensors for On-Line Structural Identification

[+] Author and Article Information
Victor Giurgiutiu

Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208e-mail: victorg@sc.edu

Andrei N. Zagrai

Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208

J. Vib. Acoust 124(1), 116-125 (Jul 01, 2001) (10 pages) doi:10.1115/1.1421056 History: Received February 01, 2001; Revised July 01, 2001
Copyright © 2002 by ASME
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Schematic of conventional modal analysis structural identification experiments (Heylen et al. 1997)
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Interaction between PZT active sensor and a substructure: (a) geometry; (b) forces and moments
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PZT wafer active sensor constrained by structural stiffness, kstr
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Experimental specimens to simulate one-dimensional structure
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Experimental set up for dynamic identification of steel beams
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Experimental and calculated spectra of frequencies for single thickness narrow beam (Beam #1)
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Experimental and calculated spectra of frequencies for double thickness narrow beam (Beam #2)
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Experimental and calculated spectra of frequencies for single thickness wide beam (Beam #3)
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Experimental and calculated spectra of frequencies for double thickness wide beam (Beam #4)
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Calibration results for piezoelectric wafer active sensors. Statistical distribution of: (a) capacitance as in-process quality check; (b) 1st resonance frequencies. (Solid line represents Gauss distribution.)
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Active sensor self-diagnostic using the imaginary part of the E/M impedance: when sensor is disbonded, new free-vibration resonance features appear at ∼267 kHz
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Aircraft turbo-engine blade equipped with PZT active sensors
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E/M impedance spectrum of aircraft turbo-engine blade




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