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Tuesday, July 9 • 16:50 - 17:10
MODELING OF AN ACOUSTIC ENERGY HARVESTER BASED ON THE DUAL-LAYERED MEMBRANE-TYPE METAMATERIALS

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Harvesting the widely propagated sound energy, especially from the low-frequency indus-try noise, may drive portable devices and wireless sensors conveniently. However, it's a daunting challenge to harvest low energy density and long-wavelength sound waves with small-scale devices. As acoustic metamaterials can manipulate sound waves in the sub-wavelength scale, the acoustic energy harvester (AEH) based on the metamaterials can be compact and may work efficiently. In this work, we propose an AEH system includes two critically coupled membrane-type acoustic metamaterials (AMs) and a ring-type piezoelec-tric energy-transducer inserted in. At the working frequencies, the coupled AM increasing the density of sound energy dramatically and the transducer can convert sound energy into electric energy. The simulated results of the finite element model show that the aperture of the transducer can increase the efficiency of the sound energy conversion but cause nonlin-ear phenomenon. An experiment was carried out in an acoustic impedance tube to verify effects of the LAM system.


Tuesday July 9, 2019 16:50 - 17:10 EDT
Westmount 6
  T02 Act. noise & vib. cntrl., RS03 Semi-active control