Journal of Electrical and Electronic Materials

"Bimorph cantilever"

Energy Harvesting Characteristics of Spring Supported Piezoelectric Cantilever Structure (SPCS): Kyoung Bum Kim, Chang Il Kim, Young Hun Jeong, Young Jin Lee, Jeong Ho Cho, Jong Hoo Paik, Sahn Nahm, Tae Hyeon Seong; J Korean Inst Electr Electron Mater Eng 2012;25(10):766-772. Published online October 1, 2012; DOI: https://doi.org/10.4313/JKEM.2012.25.10.766

Abstract
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Spring supported piezoelectric cantilever structures (SPCS) were fabricated for vibration-based energy harvester application. We selected four elastic springs (A, B, C, and D type) as cantilever`s supporter, each elastic spring has a different spring constant (S). The C type of SPCS (SC: 4,649 N/m) showed a extremely low resonance frequency of 81 Hz along with the highest power output of 38.5 mW while the A type of SPCS (SA: 40,629 N/m) didn`t show a resonance frequency while. Therefore, it is considered that the lower spring constant lead to a lower resonance frequency of the SPCS. In addition, a tip mass (18 g) at one end of the SPCS could further reduce the resonance frequency without heavy degradation of power output.

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