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.

• 김형찬 | Kim, Hyung-Chan
• 송현철 | 송현철
• 정대용 | 정대용
• 김현재 | 김현재
• 윤석진 | 윤석진
• 주병권 | 주병권