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Experimental and theoretical studies on piezoelectric energy harvesting from low-frequency ambient random vibrations
Experimental and theoretical studies on piezoelectric energy harvesting
from low-frequency ambient random vibrations
M. Karimi, R. Tikani, S. Ziaei-Rad and H.R. Mirdamadi
Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
Abstract
In this paper, an analytical approach was used to formulate for gathering energy from
ambient sources of vibrations. The apparatus consists of a cantilevered beam harvester with
a piezoelectric patch. A coupled electromechanical modal model based on Euler-Bernoulli
theory is used. The governing equations were extracted using Hamilton’s principle and then
were discretized by using the Rayleigh-Ritz approach. The expected value of the electrical
power output was obtained for a weakly stationary, Gaussian bandpass with zero mean base
excitation. Next, a numerical solution for the beam under band-limited ambient random
acceleration as the input was calculated and validated by experiment. The numerical results
closely correlated to the experimental data with a deviation of about 10%.
Journal Papers
Month/Season:
Spring
Year:
2015