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Research Papers

Modeling and Analysis of Piezoelectric Energy Harvesting With Dynamic Plucking Mechanism

[+] Author and Article Information
Xinlei Fu

Department of Mechanical and
Automation Engineering,
The Chinese University of Hong Kong,
Shatin, Hong Kong, China

Wei-Hsin Liao

Fellow ASME
Department of Mechanical and
Automation Engineering,
The Chinese University of Hong Kong,
Shatin, Hong Kong, China
e-mail: whliao@cuhk.edu.hk

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received June 14, 2018; final manuscript received October 30, 2018; published online January 22, 2019. Assoc. Editor: Alper Erturk.

J. Vib. Acoust 141(3), 031002 (Jan 22, 2019) (9 pages) Paper No: VIB-18-1263; doi: 10.1115/1.4042002 History: Received June 14, 2018; Revised October 30, 2018

Nonharmonic excitations are widely distributed in the environment. They can work as energy sources of vibration energy harvesters for powering wireless electronics. To overcome the narrow bandwidth of linear vibration energy harvesters, plucking piezoelectric energy harvesters have been designed. Plucking piezoelectric energy harvesters can convert sporadic motions into plucking force to excite vibration energy harvesters and achieve broadband performances. Though different kinds of plucking piezoelectric energy harvesters have been designed, the plucking mechanism is not well understood. The simplified models of plucking piezoelectric energy harvesting neglect the dynamic interaction between the plectrum and the piezoelectric beam. This research work is aimed at investigating the plucking mechanism and developing a comprehensive model of plucking piezoelectric energy harvesting. In this paper, the dynamic plucking mechanism is investigated and the Hertzian contact theory is applied. The developed model of plucking piezoelectric energy harvesting accounts for the dynamic interaction between the plectrum and the piezoelectric beam by considering contact theory. Experimental results show that the developed model well predicts the responses of plucking piezoelectric energy harvesters under different plucking velocities and overlap lengths. Parametric studies are conducted on the dimensionless model after choosing appropriate scaling. The influences of plucking velocity and overlap length on energy harvesting performance and energy conversion efficiency are discussed. The comprehensive model helps investigate the characteristics and guide the design of plucking piezoelectric energy harvesters.

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Figures

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Fig. 2

Comparison of plucking force and impact force

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Fig. 1

Schematic diagram of plucking piezoelectric energy harvester

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Fig. 3

Responses of a plucking piezoelectric energy harvester

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Fig. 7

Energy distribution under different overlap lengths

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Fig. 8

Energy distribution under different load resistors

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Fig. 4

Plucking force under different plucking velocities: (a) force profile and (b) maximal force and contact period

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Fig. 5

Plucking force under different overlap lengths: (a) force profile and (b) maximal force and contact period

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Fig. 6

Energy distribution under different plucking velocities

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Fig. 12

Measurement with high-speed camera

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Fig. 13

Comparison of simulation and experimental results of plucking piezoelectric energy harvester

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Fig. 9

Schematic diagram of piezoelectric beam

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Fig. 10

Comparison of simulation and experimental results of piezoelectric beam

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Fig. 11

(a) Profile of plectrum and (b) setup of plucking testing

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Fig. 14

Maximal displacement under different plucking velocities with overlap length 0.04 mm

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Fig. 15

Maximal displacement under different plucking velocities with overlap length 0.02 mm

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Fig. 16

Nominal energy under dimensionless parameter of plucking velocity

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Fig. 17

Nominal energy under dimensionless parameter of overlap length

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