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Technical Brief

Broadband Energy Harvesting From Vibrations Using Magnetic Transduction

[+] Author and Article Information
Giovanni Caruso

Construction Technologies Institute,
Italian National Research Council,
Monterotondo Stazione 00015, Italy
e-mail: g.caruso@itc.cnr.it

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received May 25, 2015; final manuscript received August 11, 2015; published online October 6, 2015. Assoc. Editor: Mohammed Daqaq.

J. Vib. Acoust 137(6), 064503 (Oct 06, 2015) (4 pages) Paper No: VIB-15-1178; doi: 10.1115/1.4031413 History: Received May 25, 2015; Revised August 11, 2015

In this paper, an adaptive electromagnetic energy harvester is proposed and analyzed. It is composed of an oscillating mass equipped with an electromagnetic transducer, whose pins are connected to a resonant resistive–inductive–capacitive electric circuit in order to increase its effective bandwidth. Closed-form expressions for the optimal circuit parameters are presented, which maximize the power harvested by the device under harmonic excitation. The harvesting efficiency, defined as the ratio between the harvested power and the power absorbed by the oscillating device, is also reported. It is used as an alternative objective function for the optimization of the harvester circuit parameters.

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References

Tang, L. , Yang, Y. , and Soh, C. , 2010, “ Toward Broadband Vibration-Based Energy Harvesting,” J. Intell. Mater. Syst. Struct., 21(18), pp. 1867–1897. [CrossRef]
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Xiong, X. , and Oyadiji, O. , 2015, “ Tapered Two-Layer Broadband Vibration Energy Harvesters,” ASME J. Vib. Acoust., 137(3), p. 031014. [CrossRef]
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Renno, J. , Daqaq, M. , and Inman, D. , 2009, “ On the Optimal Energy Harvesting From a Vibration Source,” J. Sound Vib., 320(1–2), pp. 386–405. [CrossRef]
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Figures

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Fig. 8

Optimized harvesting efficiency Ee, for ϕ=0, versus excitation frequency α. Several values of K, i.e., of inductance L, employed in the analysis.

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Fig. 1

Magnetic harvester shunted to a resonant electric circuit

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Fig. 7

Sensitivity of the harvested power with respect to a nonoptimal value of resistance R

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Fig. 6

Comparison between optimal power in case of optimized resonant circuit and with circuit containing only the harvesting resistance R

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Fig. 5

Optimal resistance R versus external excitation frequency α

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Fig. 4

Optimal capacitance C versus external excitation frequency α. Several values of K, i.e., of inductance L, employed in the analysis.

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Fig. 3

Optimal inductance L versus external excitation frequency α. Several values of K, i.e., of inductance L, employed in the analysis.

Grahic Jump Location
Fig. 2

Tuning parameter ϕ versus external excitation frequency α. Several values of K, i.e., of inductance L, employed in the analysis.

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