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http://dx.doi.org/10.3740/MRSK.2007.17.12.660

Frequency Tuning of Unimorph Cantilever for Piezoelectric Energy Harvesting  

Kim, Hyung-Chan (School of Electrical Engineering, College of Engineering, Korea Univ.)
Song, Hyun-Cheol (Thin Film Materials Research Center, Korea Institute of Science & Technology)
Jeong, Dae-Yong (Thin Film Materials Research Center, Korea Institute of Science & Technology)
Kim, Hyun-Jai (Thin Film Materials Research Center, Korea Institute of Science & Technology)
Yoon, Seok-Jin (Thin Film Materials Research Center, Korea Institute of Science & Technology)
Ju, Byeong-Kwon (School of Electrical Engineering, College of Engineering, Korea Univ.)
Publication Information
Korean Journal of Materials Research / v.17, no.12, 2007 , pp. 660-663 More about this Journal
Abstract
Piezoelectric energy harvesting from our surrounding vibration has been studied for driving the wireless sensor node. To change the vibration energy into the electric-energy efficiently, the natural frequency of cantilever needs to be adjusted to that of a vibration source. When adding 6.80g mass on the end of the fabricated cantilever, a natural frequency shifts from 136 Hz into 49.5 Hz. In addition, electro-mechanical coupling factor increased from 10.20% to 11.90% and resulted in the 1.18 times increase of maximum output power.
Keywords
Energy harvesting; Piezoelectric; Frequency tuning;
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