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Research Papers

Cantilevered Piezoelectric Energy Harvester With a Dynamic Magnifier

[+] Author and Article Information
A. Aladwani1

Mechanical Engineering Department,  University of Maryland, College Park, MD 20742

M. Arafa

Mechanical Engineering Department,  American University in Cairo, New Cairo, Egypt 11835

O. Aldraihem

Mechanical Engineering Department,  King Saud University, King Abdulaziz City of Science & Technology (KACST), Riyadh, Saudi Arabia 11421

A. Baz1

Mechanical Engineering Department,  University of Maryland, College Park, MD 20742baz@umd.edu

1

Corresponding author.

J. Vib. Acoust 134(3), 031004 (Apr 24, 2012) (10 pages) doi:10.1115/1.4005824 History: Received August 25, 2010; Revised October 04, 2011; Published April 23, 2012; Online April 24, 2012

Conventional energy harvester typically consists of a cantilevered composite piezoelectric beam which has a proof mass at its free end while its fixed end is mounted on a vibrating base structure. The resulting relative motion between the proof mass and the base structure produces a mechanical strain in the piezoelectric elements which is converted into electrical power by virtue of the direct piezoelectric effect. In this paper, the harvester is provided with a dynamic magnifier consisting of a spring-mass system which is placed between the fixed end of the piezoelectric beam and the vibrating base structure. The main function of the dynamic magnifier, as the name implies, is to magnify the strain experienced by the piezoelectric elements in order to amplify the electrical power output of the harvester. With proper selection of the design parameters of the magnifier, the harvested power can be significantly enhanced and the effective bandwidth of the harvester can be improved. The theory governing the operation of this class of cantilevered piezoelectric energy harvesters with dynamic magnifier (CPEHDM) is developed using the finite element method. Numerical examples are presented to illustrate the merits of the CPEHDM in comparison with the conventional piezoelectric energy harvesters (CPEH). The obtained results demonstrate the feasibility of the CPEHDM as a simple and effective means for enhancing the magnitude and spectral characteristics of CPEH.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

CPEH with series connection of piezoelectric patches

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Figure 2

CPEHDM with series connection of piezoelectric patches

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Figure 3

Original and deflected positions of the cantilevered piezoelectric energy harvester with dynamic magnifier

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Figure 4

Effect of the load resistance on the peak amplitude of the electrical power output for base excitations at the short-circuit (——-) and open-circuit (··········) resonant frequencies of the first vibration mode

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Figure 5

Effect of the excitation frequency and end mass on the peak amplitude of the electrical power output of the CPEH at the optimal resistive load corresponding to the short-circuit condition

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Figure 6

Effect of the load resistance (a) and excitation frequency (b) on the peak amplitude of the electrical power output for the CPEHDM (——-) with Mf=M and the CPEH (··········) at the short-circuit conditions of the first vibration mode

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Figure 7

Effect of the load resistance (a) and excitation frequency (b) on the peak amplitude of the electrical power output for the CPEHDM (——-) with Mf=2M and the CPEH (··········) at the short-circuit conditions of the first vibration mode

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Figure 8

Effect of the load resistance (a) and excitation frequency (b) on the peak amplitude of the electrical power output for the CPEHDM (——-) with Mf=10M and the CPEH (··········) at the short-circuit conditions of the first vibration mode

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Figure 9

Effect of the load resistance (a) and excitation frequency (b) on the peak amplitude of the electrical power output for the CPEHDM (——-) with Mf=15M and the CPEH (··········) at the short-circuit conditions of the first vibration mode

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