Numerical and experimental study of bistable piezoelectric energy harvester

Vishrut Shah, Rajeev Kumar, Mohammad Talha, Jens Twiefel

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Piezoelectric energy harvesting from mechanical vibrations is a reliable technology to charge low power electronic equipment. It has been reported in the literature that low frequency broadband vibrations cannot be harvested effectively using linear piezoelectric energy harvester (PEH). In this paper a bistable nonlinear PEH with two distinct energy wells generated using repulsive magnetic interactions between a cantilever magnetic proof mass and an external magnet is considered. It has been modeled using finite element method and validated with experimental results. Experimental results verify that, for our study, distance between magnetic proof mass and external magnet of 1.32 T flux density should be less than or equal to 8.5 mm for maintaining bistability. This distance also affects to the resonance frequency of harvester. Maximum efficiency of the harvester has been noticed at 8.5mm. Further it has been shown experimentally that the bistable nonlinear piezoelectric energy harvester takes almost half of the time taken by its linear counterpart to charge a 20 mAh battery.

Original languageEnglish
Pages (from-to)38-56
Number of pages19
JournalIntegrated Ferroelectrics
Issue number1
StatePublished - 2 Sep 2018
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2018, © 2018 Taylor & Francis Group, LLC.


  • Energy harvesting
  • bistable
  • piezoelectric
  • vibration


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