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Research Papers

Modeling and Analysis of a Piezoelectric Energy Scavenger for Rotary Motion Applications

[+] Author and Article Information
F. Khameneifar, M. Moallem

Mechatronic Systems Engineering, School of Engineering Science, Simon Fraser University, 250-13450 102 Avenue, Surrey, BC, V3T 0A3, Canada

S. Arzanpour2

Mechatronic Systems Engineering, School of Engineering Science, Simon Fraser University, 250-13450 102 Avenue, Surrey, BC, V3T 0A3, Canadaarzanpour@sfu.ca

2

Corresponding author.

J. Vib. Acoust 133(1), 011005 (Dec 08, 2010) (6 pages) doi:10.1115/1.4002789 History: Received February 22, 2010; Revised July 30, 2010; Published December 08, 2010; Online December 08, 2010

This paper presents modeling and analysis of a piezoelectric mounted rotary flexible beam that can be used as an energy scavenger for rotary motion applications. The energy harvester system consists of a piezoelectric bimorph cantilever beam with a tip mass mounted on a rotating hub. Assuming Euler–Bernoulli beam equations and considering the effect of a piezoelectric transducer, equations of motion are derived using the Lagrangian approach followed by relationships describing the harvested power. The equations provide a quantitative description of how the hub acceleration and gravity due to the tip mass contribute power to the energy harvester. In particular, expressions describing optimum load resistance and the maximum power that can be harvested using the proposed system are derived. Numerical simulations are performed to show the performance of the harvester by obtaining tip velocities and electrical output voltages for a range of electrical load resistances and rotational speeds. It is shown that by proper sizing and parameter selection, the proposed system can supply enough energy for operating wireless sensors in rotating mechanisms such as tires and turbines.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

System for harvesting energy from rotary motion application

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Figure 2

Electrical circuit symbolizing the parallel connection of piezoelectric layers

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Figure 3

Eigenfrequency versus speed of the hub

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Figure 4

Tip velocity for R=100 K

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Figure 5

Output voltage for R=100 K

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Figure 6

Harvested power for R=100 K

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Figure 7

Variations in the peak power with load resistance

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Figure 8

Optimal resistance versus damping ratio

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