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Research Papers

Two Methods to Broaden the Bandwidth of a Nonlinear Piezoelectric Bimorph Power Harvester

[+] Author and Article Information
Hongping Hu

Department of Mechanics;Hubei Key Laboratory of Engineering Structural
Analysis and Safety Assessment,
Huazhong University of
Science and Technology,
Wuhan 430074, China;
Franche-Comté Electronique Mécanique
Thermique et Optique, CNRS UMR 6174,
Université de Bourgogne Franche-Comté,
Besançon 25030, France
e-mail: huhp@hust.edu.cn

Longxiang Dai, Hao Chen

Department of Mechanics;Hubei Key Laboratory of Engineering Structural
Analysis and Safety Assessment,
Huazhong University of
Science and Technology,
Wuhan 430074, China

Shan Jiang

Department of Mechanics;Hubei Key Laboratory of Engineering Structural
Analysis and Safety Assessment,
Huazhong University of
Science and Technology,
Wuhan 430074, China;
Franche-Comté Electronique Mécanique
Thermique et Optique, CNRS UMR 6174,
Université de Bourgogne Franche-Comté,
Besançon 25030, France

Hairen Wang

Purple Mountain Observatory,
Chinese Academy of Sciences,
Nanjing 210008, China
e-mail: hairenwang@pmo.ac.cn

Vincent Laude

Franche-Comté Electronique Mécanique
Thermique et Optique, CNRS UMR 6174,
Université de Bourgogne Franche-Comté,
Besançon 25030, France

1Corresponding authors.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received June 17, 2016; final manuscript received January 6, 2017; published online April 13, 2017. Assoc. Editor: Miao Yu.

J. Vib. Acoust 139(3), 031008 (Apr 13, 2017) (10 pages) Paper No: VIB-16-1305; doi: 10.1115/1.4035717 History: Received June 17, 2016; Revised January 06, 2017

We propose two methods to broaden the operation bandwidth of a nonlinear pinned–pinned piezoelectric bimorph power harvester. The energy-scavenging structure consists of a properly poled and electroded flexible bimorph with a metallic layer in the middle, and is subjected to flexural vibration. Nonlinear effects at large deformations near resonance are considered by taking the in-plane extension of the bimorph into account. The resulting output powers are multivalued and exhibit jump phenomena. Two methods to broaden the operation bandwidth are proposed: The first method is to extend the operation frequency to the left single-valued region through optimal design. The second method is to excite optimal initial conditions with a voltage source. Larger output powers in the multivalued region of the nonlinear harvester are obtained. Hence, the operation bandwidth is broadened from the left single-valued region to the whole multivalued region.

Copyright © 2017 by ASME
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References

Figures

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Fig. 1

A pinned-pinned piezoelectric bimorph power harvester: (a) front view and (b) side view of the structure

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Fig. 2

Output power versus driving frequency for different applied pressures: analytical solution (solid lines) and numerical solution (, , )

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Fig. 3

Output power versus applied pressure for different electric resistors, where Ω0 = 1.1

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Fig. 4

Output power versus electric resistor for different applied pressures, where Ω0 = 1.1

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Fig. 5

Output power versus applied pressures for different Ω0, R = 1 MΩ

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Fig. 6

Output power versus driving frequency for different electric resistors, where p0 = 10 Pa

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Fig. 7

Output power versus driving frequency for different span-thickness ratios l/h, where p0 = 10 Pa, R = 1 MΩ, and h = 0.5 mm

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Fig. 8

Output power versus frequency for different ratios of h/c, where p0 = 10 Pa, R = 1 MΩ, and c = 0.2 mm

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Fig. 9

Basin of attraction for the harvester with p0 = 10 Pa, R = 1 MΩ: (a) Ω0=1.085, (b) Ω0=1.105, (c) Ω0=1.125, and (d) superposition of the three frequencies

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Fig. 10

Displacement amplitudes versus frequency for different excitation voltages Ve. Dotted lines limit an amplitude range for which operation is within white region of the basin of attraction in Fig. 9(d).

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Fig. 11

Appropriate phase range to stop the excitation of the voltage source with ω¯e=1.08 and frequency of pressure load (a) Ω0=1.085, (b) Ω0=1.105, (c) Ω0=1.125, and (d) superposition of the three frequencies

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Fig. 12

Flowchart of imposing an optimal initial condition

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