We explore the potential of human-scale motion energy harvesting toward enabling self-powered
wearable electronic components to avoid the burden of battery replacement and charging in next-generation
wireless applications. The focus in this work is piezoelectric transduction for converting human motion into
electricity. Specifically, we explore three piezoelectric energy harvesting approaches experimentally and
numerically: (1) Direct base excitation of a cantilevered bimorph configuration without/with a tip mass; (2)
plucking of a bimorph cantilever using a flexible/nonlinear plectrum; and (3) direct force excitation of a
curved unimorph. In all cases, electromechanical models are developed and experimental validations are
also presented. Specifically a nonlinear plectrum model is implemented for the plucking energy harvester.
Average power outputs are on the order 10-100 uW and can easily exceed mW in certain cases via design
optimization.
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