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Abstract An acoustic metamaterial energy harvesting device suitable for working in the low-frequency range is proposed. First, a defect state of local resonance is created by constructing defects in porous acoustic metamaterial structures, the elastic strain energy of incident acoustic waves is concentrated in the defect area, and the energy conversion is realized using piezoelectric chips. Then the finite element method is used to study the properties of power and voltage captured by a cellular porous acoustic metamaterial at resonant frequency. Furthermore, the influence of pore size on the energy harvesting effect is explored by changing the pore size gradually. It is found that compared with those of the device without holes, the energy capture characteristics of the device at low frequency can be significantly improved by drilling holes in the cell. The device proposed in this study has the advantages of easy processing and strong practicability, which further expands its ability to capture energy in low-frequency range and has potential application prospects.
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Received: 10 August 2020
Published: 14 April 2021
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2021, Vol. 42 
