Multiphysics finite element model of a frequency-amplifying piezoelectric energy harvester with impact coupling for low-frequency vibrations

This paper presents experimentally-verified multiphysics finite element model of a wideband vibration energy harvester with impact coupling, which operates on the principle of frequency up-conversion: under low-frequency harmonic base excitation a cantilever-type resonator (with resonant frequency of 18.8 Hz) impacts a high-frequency piezoelectric cantilever, which starts freely vibrate at its resonant frequency of 374 Hz. Such input frequency amplification enables efficient power generation under low-frequency ambient excitations. The model was implemented in COMSOL and the contact between the cantilevers was formulated by using a nonlinear viscoelastic model. Reported results of dynamical and electrical testing of the fabricated vibration energy harvester confirm the accuracy of the model as well as reveal some operational characteristics of the device under varying impact and excitation conditions.


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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