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Proceedings Paper

Multilayer piezoelectric stack actuator characterization
Author(s): Stewart Sherrit; Christopher M. Jones; Jack B. Aldrich; Chad Blodget; Xioaqi Bao; Mircea Badescu; Yoseph Bar-Cohen
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Paper Abstract

Future NASA missions are increasingly seeking to use actuators for precision positioning to accuracies of the order of fractions of a nanometer. For this purpose, multilayer piezoelectric stacks are being considered as actuators for driving these precision mechanisms. In this study, sets of commercial PZT stacks were tested in various AC and DC conditions at both nominal and extreme temperatures and voltages. AC signal testing included impedance, capacitance and dielectric loss factor of each actuator as a function of the small-signal driving sinusoidal frequency, and the ambient temperature. DC signal testing includes leakage current and displacement as a function of the applied DC voltage. The applied DC voltage was increased to over eight times the manufacturers' specifications to investigate the correlation between leakage current and breakdown voltage. Resonance characterization as a function of temperature was done over a temperature range of -180°C to +200°C which generally exceeded the manufacturers' specifications. In order to study the lifetime performance of these stacks, five actuators from one manufacturer were driven by a 60volt, 2 kHz sine-wave for ten billion cycles. The tests were performed using a Lab-View controlled automated data acquisition system that monitored the waveform of the stack electrical current and voltage. The measurements included the displacement, impedance, capacitance and leakage current and the analysis of the experimental results will be presented.

Paper Details

Date Published: 2 April 2008
PDF: 12 pages
Proc. SPIE 6929, Behavior and Mechanics of Multifunctional and Composite Materials 2008, 692909 (2 April 2008); doi: 10.1117/12.776396
Show Author Affiliations
Stewart Sherrit, Jet Propulsion Lab. (United States)
Christopher M. Jones, Jet Propulsion Lab. (United States)
Jack B. Aldrich, Jet Propulsion Lab. (United States)
Chad Blodget, Jet Propulsion Lab. (United States)
Xioaqi Bao, Jet Propulsion Lab. (United States)
Mircea Badescu, Jet Propulsion Lab. (United States)
Yoseph Bar-Cohen, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 6929:
Behavior and Mechanics of Multifunctional and Composite Materials 2008
Marcelo J. Dapino; Zoubeida Ounaies, Editor(s)

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