Research Papers

Multi-Modal Vibration Energy Harvesting Using a Trapezoidal Plate

[+] Author and Article Information
Mustafa H. Arafa

 Mechanical Engineering Department, American University in Cairo, AUC Avenue, P.O. Box 74, New Cairo 11835, Egyptmharafa@aucegypt.edu

J. Vib. Acoust 134(4), 041010 (May 29, 2012) (6 pages) doi:10.1115/1.4005837 History: Received May 18, 2011; Revised October 18, 2011; Published May 29, 2012; Online May 29, 2012

Vibration-based energy harvesters are usually designed to exhibit natural frequencies that match those of the excitation for maximum power output. This has spurred interest into the design of devices that respond to variable frequency sources. In this work, an electromagnetic energy harvester in the form of a base excited trapezoidal plate is proposed. The plate geometry is designed to achieve two closely spaced vibration modes in order to harvest energy across a broader bandwidth. The ensuing bending and twisting vibrations are utilized in this capacity by placing a magnet on the plate tip that moves past a stationary coil. A dynamic model is presented to predict the system performance and is verified experimentally.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Schematic illustration of proposed design

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Figure 2

Mapping of quadrilateral plate element

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Figure 4

Frequency ratio versus B (A = 0.03 m, C = 0.1 m)

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Figure 5

First two vibration modes

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Figure 6

Experimental setup

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Figure 7

Output voltage per base acceleration (Rl  = 30 Ω)

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Figure 8

Output voltage per base acceleration (Rl  = 100 Ω)

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Figure 9

Output voltage per base acceleration (Rl  = 1000 Ω)

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Figure 10

Photograph of hollowed out trapezoidal plate with coordinates of edge points in mm (a); finite element mesh (b)

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Figure 11

Output voltage per base acceleration for a hollowed out and solid trapezoid: (a) experiment; (b) theory (Rl  = 100 Ω)



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