Article Dans Une Revue Journal of Physics D: Applied Physics Année : 2017

Tunable Sub-wavelength Acoustic Energy Harvesting with Metamaterial Plate

Résumé

We report theoretically on a sub-wavelength acoustic energy harvesting (AEH) using a thin acoustic metamaterial (AM) made of spring-mass resonators attached to the surface of a homogeneous elastic thin plate. Considering an incident acoustic wave hitting the AM plate, tunable and high efficient AEH is achieved by introducing a sub-wavelength defect inside the AM structure to confine the elastic energy into a spot which is then electromechanically converted into electrical power using a ceramic PZT patch. Several types of sub-wavelength cavities capable of confining acoustic energy at the sonic regime are extensively investigated for the optimization of AEH. Three analytical approaches, band structure, sound transmission loss and electrical-to-mechanical energy conversion, are proposed to fully describe the system interaction with the acoustic wave and quantify the AEH performance. Computed results show that an average power of 18 µW can be harvested using a specific cavity design of only 3 × 3 cm 2 size from an incident acoustic wave with a sound pressure level of 100 dB at 520 Hz. Such system can open a way through the design of effective tunable sub-wavelength acoustic energy harvesters based on AM applied to scavenge energy from sound.

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Dates et versions

hal-04981040 , version 1 (06-03-2025)

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Mourad Oudich, Yong Li. Tunable Sub-wavelength Acoustic Energy Harvesting with Metamaterial Plate. Journal of Physics D: Applied Physics, 2017, 50 (31), pp.315104. ⟨10.1088/1361-6463/aa779d⟩. ⟨hal-04981040⟩
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