Energy harvesting by dynamic unstability and internal resonance for piezoelectric beam

We investigated the energy harvesting of a vertical beam with tip mass under vertical excitations. We applied dynamic unstability and internal resonance to improve the efficiency of harvesting. The experiments of harmonic excitation were carried out. Results show that for the beam there exist intern...

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Bibliographic Details
Published in:Applied physics letters 2015-08, Vol.107 (9)
Main Authors: Lan, Chunbo, Qin, Weiyang, Deng, Wangzheng
Format: Article
Language:English
Subjects:
Applied physics
BEAMS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Coupling
EFFICIENCY
ELECTRIC POTENTIAL
Energy harvesting
EXCITATION
Harmonic excitation
MASS
PIEZOELECTRICITY
STOCHASTIC PROCESSES
Weight
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Summary:We investigated the energy harvesting of a vertical beam with tip mass under vertical excitations. We applied dynamic unstability and internal resonance to improve the efficiency of harvesting. The experiments of harmonic excitation were carried out. Results show that for the beam there exist internal resonances in the dynamically unstable and the buckling bistable cases. The dynamic unstability is a determinant for strong internal resonance or mode coupling, which can be used to create a large output from piezoelectric patches. Then, the experiments of stochastic excitation were carried out. Results prove that the internal resonance or mode coupling can transfer the excitation energy to the low order modes, mainly the first and the second one. This can bring about a large output voltage. For a stochastic excitation, it is proved that there is an optimal weight of tip mass for realizing internal resonance and producing large outputs.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4930073