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Research Papers

A Self-Sufficient and Frequency Tunable Piezoelectric Vibration Energy Harvester

[+] Author and Article Information
Cevat Volkan Karadag

Mem. ASME
Department of Mechanical Engineering,
Yeditepe University,
Istanbul 34755, Turkey
e-mail: volkaradag@gmail.com

Nezih Topaloglu

Mem. ASME
Department of Mechanical Engineering,
Yeditepe University,
Istanbul 34755, Turkey
e-mail: ntopaloglu@asme.org

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received April 2, 2016; final manuscript received September 7, 2016; published online November 23, 2016. Assoc. Editor: Lei Zuo.

J. Vib. Acoust 139(1), 011013 (Nov 23, 2016) (8 pages) Paper No: VIB-16-1157; doi: 10.1115/1.4034775 History: Received April 02, 2016; Revised September 07, 2016

In this paper, a novel smart vibration energy harvester (VEH) is presented. The harvester automatically adjusts its natural frequency to stay in resonance with ambient vibration. The proposed harvester consists of two piezoelectric cantilever beams, a tiny piezomotor with a movable mass attached to one of the beams, a control unit, and electronics. Thanks to its self-locking feature, the piezomotor does not require energy to fix its movable part, resulting in an improvement in overall energy demand. The operation of the system is optimized in order to maximize the energy efficiency. At each predefined interval, the control unit wakes up, calculates the phase difference between two beams, and if necessary, actuates the piezomotor to move its mass in the appropriate direction. It is shown that the proposed tuning algorithm successfully increases the fractional bandwidth of the harvester from 4% to 10%. The system is able to deliver 83.4% of the total harvested power into usable electrical power, while the piezomotor uses only 2.4% of the harvested power. The presented efficient, autotunable, and self-sufficient harvester is built using off-the-shelf components and it can be easily modified for wide range of applications.

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Figures

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Fig. 1

Schematic of the proposed VEH

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Fig. 2

Photograph of the assembled system

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Fig. 3

Mechanical lumped model of the VEH

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Fig. 4

Algorithm flowchart

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Fig. 5

Power harvesting electronics. Signals are shown with dashed lines.

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Fig. 6

Frequency response of the secondary beam and the tunable beam at various tip mass positions. The secondary beam response is given as a single curve due to its negligible hysteresis.

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Fig. 7

The frequency response with and without tuning. The sweep rate is 1 Hz/min. The sleep period for the adaptive response is 4 s.

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Fig. 8

The effect of sweep rate on tuning performance

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Fig. 9

Storage capacitor voltage during a frequency up-sweep and down-sweep between 49 Hz and 56 Hz

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Fig. 10

Storage capacitor voltage time response in the discharge-recharge experiment

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