Auxetic clamped-clamped resonators for high-efficiency vibration energy harvesting at low-frequency excitation

Fariba Ebrahimian, Zohre Kabirian, Davood Younesian and Pezhman Eghbali

Applied Energy, 2021, vol. 295, issue C, No S0306261921004773

Abstract: Here, we utilize the auxetic concept to improve output electrical power and reduce resonance frequency for the piezoelectric vibration energy harvesting. An energy harvester consists of a proof mass and two supporter beams with piezoelectric patches, is proposed. Presented energy harvester prototype is appropriate for applications with limited allowable displacement. Three different auxetic structures are proposed and their performances are compared to the conventional plain system. Finite element (FE) modelling is provided to evaluate these structures and optimize their geometrical parameters and electrical resistance to achieve the best energy harvesting performance. The FE model is validated through experimental tests in which the energy harvesters with optimized parameters are excited by an electrodynamic shaker in different frequencies. It is shown that the proposed designs are able to remarkably enhance the harvested electrical power with respect to the plain structure. The experimental tests show that the Auxetic-I, II and III could enhance the output electrical power with a magnification factor of 10, 6.7 and 6.1 respectively, compared to the conventional structure. The resonant working frequency reduced up to 30.45%, 19.55% and 27.53% for different designs.

Keywords: Vibration; Energy harvesting; Auxetic resonator; Low frequency; High efficiency (search for similar items in EconPapers)
Date: 2021
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DOI: 10.1016/j.apenergy.2021.117010

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