A Multidirectional Piezoelectric Vibration Energy Harvester with Direction-Dependent Dual Resonance

Robert Kovenburg, Richard Gale, Burak Aksak

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


A multidirectional base-mounted piezoelectric vibration energy harvester with a 2 mm ×2 mm ×20 mm polyurethane resonating beam, an 8.36-g tip mass, and a lead zirconium titanate (PZT) transducer was designed, fabricated, and tested. The harvester was shown to operate in any direction in a 2-D plane and produced as much as 8.2~μ {W across a 50- {M}Ω load under harmonic base excitations with peak acceleration of 0.25 g at an angle of 45°. Experiments showed that, in some directions, the harvester had two resonant frequencies, one at 36.0 Hz and one at 38.5 Hz. Analysis shows that this phenomenon is caused by deviations in the shape of the polyurethane beam from the intended square cross section. This analysis is used to propose a method for designing harvesters with any two desired resonant frequencies. The possibility of using this design method to increase the harvester's bandwidth is discussed.

Original languageEnglish
Article number9296960
Pages (from-to)1844-1853
Number of pages10
JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Issue number5
StatePublished - May 2021


  • Energy harvesting
  • multidirectional
  • piezoelectric transducers
  • polymer beam
  • polyurethane
  • vibration


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