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Research Papers

Analytical and Experimental Characterization of Macro-Fiber Composite Actuated Thin Clamped-Free Unimorph Benders

[+] Author and Article Information
Onur Bilgen1

Center for Intelligent Material Systems and Structures, Virginia Tech, 310 Durham Hall, Blacksburg, VA 24061; Department of Mechanical Engineering, Virginia Tech, 310 Durham Hall, Blacksburg, VA 24061onurb@vt.edu

Alper Erturk, Daniel J. Inman

Center for Intelligent Material Systems and Structures, Virginia Tech, 310 Durham Hall, Blacksburg, VA 24061; Department of Mechanical Engineering, Virginia Tech, 310 Durham Hall, Blacksburg, VA 24061

1

Corresponding author.

J. Vib. Acoust 132(5), 051005 (Aug 19, 2010) (6 pages) doi:10.1115/1.4001504 History: Received May 15, 2009; Revised March 15, 2010; Published August 19, 2010; Online August 19, 2010

A type of piezoceramic composite actuator known as Macro-Fiber Composite (MFC) is used commonly for actuation in smart-material structures. In this paper, a linear distributed parameter electromechanical model is proposed to predict the structural response to MFC actuated clamped-free thin cantilevered beams. The structural frequency response behavior between the tip velocity of the cantilever beam and the actuation voltage of the piezoelectric material is investigated experimentally for cantilevered unimorph MFC actuated benders with aluminum, brass, and steel substrate materials with different thicknesses. Good correlation is observed between the model and the experimental observations.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometric parameters of the piezoceramic fibers used in the coupling term (substrate is excluded)

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Figure 2

Digital photograph of the planar view of a MFC 8507-P1 actuator under a microscope

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Figure 3

Theoretical maximum tip-velocity response to harmonic excitation for a range of thickness ratios. Response corresponds to the first bending mode of a cantilever beam. TMFC is 0.30 mm.

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Figure 4

Theoretical variation in the first bending mode frequency (in response to harmonic excitation) with substrate thickness and material

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Figure 5

Theoretical maximum tip displacement response to harmonic excitation for a range of thickness ratios. Response corresponds to the first bending mode of a cantilever beam. TMFC is 0.30 mm.

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Figure 6

Theoretical static tip displacement per volt for a range of thickness ratios. TMFC is 0.30 mm.

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Figure 7

Left: 12 unimorphs; right: one of the unimorphs clamped for testing

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Figure 8

Tip velocity to actuation FRF comparison of experiments to model for unimorphs

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