Enhanced Energy Harvesting of Flexural Waves in Elastic Beams by Bending Mode of Graded Resonators

We show efficient elastic energy transfer and wave confinement through a graded array of resonators attached to an elastic beam. Experiments demonstrate that flexural resonators of increasing lengths allow to reduce wave scattering and to achieve the rainbow effect with local wavefield amplification...

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Bibliographic Details
Published inFrontiers in materials Vol. 8
Main Authors De Ponti, Jacopo Maria, Iorio, Luca, Riva, Emanuele, Braghin, Francesco, Corigliano, Alberto, Ardito, Raffaele
Format Journal Article
LanguageEnglish
Published Frontiers Media S.A 05.11.2021
Subjects
energy harvesting
metamaterials
piezoelectricity
rainbow effect
resonators
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Summary:We show efficient elastic energy transfer and wave confinement through a graded array of resonators attached to an elastic beam. Experiments demonstrate that flexural resonators of increasing lengths allow to reduce wave scattering and to achieve the rainbow effect with local wavefield amplifications. We show that the definition of a monotonically decreasing distribution of the natural frequencies of the resonators along the wave propagation direction, is the preferable choice to increase the energy efficiency of the system. The proposed configuration is suitable for micro-fabrication, envisaging practical applications for micro-scale vibration energy harvesting.
ISSN:2296-8016
2296-8016
DOI:10.3389/fmats.2021.745141