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Proceedings Paper

Comparison of solid state actuators based on power and energy criteria
Author(s): Victor Giurgiutiu; Craig A. Rogers
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Paper Abstract

A study of published literature and vendor information about solid-state induced-strain actuators has been undertaken to establish their dynamic-operation mechanical and electrical characteristics, and to compare their output power and energy density criteria. A theory was developed from first principles to predict the input and output power and energy amplitudes under dynamic operation including the piezo-electric counter electro-motive force and the bias- voltage effects. The effective electro-mechanical coupling coefficient, k, for an assembled active-material stack was calculated from vendor data using a remarkably simple formula. Values between 0.45 and 1.038 were found, somehow in disagreement with the generally accepted value of 0.7 for the basic material. Dynamic energy output at the optimal stiffness match condition was found to have values of up to 0.260 J for some off-the-shelf actuators. Dynamic energy density per unit volume and unit mass varied in the range 0.5 - 3.7 J/dm3 and 0.058 - 0.482 J/kg, respectively. Conversion efficiency between input electrical power and output mechanical power was found to vary widely in the range 3.74% - 32.39%. This paper presents, with priority, two remarkably simple formulae: one for calculating the effective electro-mechanical coupling coefficient, K, using standard vendor data; the other for estimating the peak reactive power for bias-voltage operation of the actuator.

Paper Details

Date Published: 1 May 1996
PDF: 14 pages
Proc. SPIE 2717, Smart Structures and Materials 1996: Smart Structures and Integrated Systems, (1 May 1996); doi: 10.1117/12.239032
Show Author Affiliations
Victor Giurgiutiu, Virginia Polytechnic Institute and State Univ. (United States)
Craig A. Rogers, Virginia Polytechnic Institute and State Univ. (United States)

Published in SPIE Proceedings Vol. 2717:
Smart Structures and Materials 1996: Smart Structures and Integrated Systems
Inderjit Chopra, Editor(s)

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