On the experimental determination of the efficiency of piezoelectric impact-type energy harvesters using a rotational flywheel

This paper demonstrates a novel methodology using a rotational flywheel to determine the energy conversion efficiency of the impact based piezoelectric energy harvesters. The influence of the impact speed and additional proof mass on the efficiency is presented here. In order to convert low frequency mechanical oscillations into usable electrical energy, a piezoelectric harvester is coupled to a rotating gear wheel driven by flywheel. The efficiency is determined from the ratio of the electrical energy generated by the harvester to the mechanical energy dissipated by the flywheel. The experimental results reveal that free vibrations of the harvester after plucking contribute significantly to the efficiency. The efficiency and output energy can be greatly improved by adding a proof mass to the harvester. Under certain conditions, the piezoelectric harvesters have an impact energy conversion efficiency of 1.2%.


Published in:
The 13th International Conference On Micro And Nanotechnology For Power Generation And Energy Conversion Applications (Powermems 2013), 476
Presented at:
The 13th International Conference on Micro- and Nano-Technology for Power Generation and Energy Conversion Applications (PowerMEMS)', u'13th International Conference on Micro- and Nano-Technology for Power Generation and Energy Conversion Applications (PowerMEMS)']
Year:
2013
Publisher:
Bristol, Iop Publishing Ltd
Laboratories:




 Record created 2014-02-17, last modified 2018-09-13


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