Abstract
This paper reports the design, fabrication and testing of a novel airflow energy harvester using variable aperture Helmholtz resonator with piezoelectric cantilever. Air flows through the resonator and vibrates the cantilever inside to produce power. At 15m/s airflow velocity, the 0.8∼11mm variable aperture achieves 76∼328Hz resonant frequency range. The harvester achieves maximally 1.6V peak-to-peak voltage at 6mm optimal aperture diameter, 15m/s air flow speed, corresponding to 221Hz resonant frequency. Peak-to-peak voltage changes as the airflow velocity changes. An active tuning circuit is presented to adjust aperture diameter to optimal value, thus improving output voltage at varying airflow velocity.
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