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.

Citations

• Feasibility study for the self powered wireless emergency call button using electromagnetic energy harvesting mechanism
  Il-Jung Kim, Yeon-Suk Choi
  Journal of the Korea Safety Management and Science.2014; 16(2): 111.     CrossRef
• A Study on the Characteristic of Energy Harvesting Mechanism for Batteryless Wireless Switch
  Yeon-Suk Choi
  Journal of the Korea Academia-Industrial cooperation Society.2014; 15(5): 3114.     CrossRef