부산대학교 도서관

Harvesting ambient vibration to replace the traditional battery power supply strategy and offer energy for electronic devices has drawn the attention of numerous researchers. However, the conventional vibration energy harvesters with high natural frequency have defected to harvest the low frequency vibration energy. In this paper, A novel non-contact frequency up-converted piezoelectric energy harvester (PEH) based on magnetic coupling is adopted to scavenging the low frequency ambient vibration. The PEH consists of a low frequency vibration absorbing system and a high frequency vibration energy transformation system, the vibration energy between the low and high frequency system is transmitted by two permanent magnets. Hamiltonian principle is applied in the process of theoretical modeling and dynamic characteristics analysis of the PEH are investigated by Average method. The energy harvesting performance of the proposed PEH is researched by diverse base excitation accelerations and load resistances. The approximate analytical results are verified by numerical integration simulations to show that the maximum peak-to-peak output voltage is 11.2 V and maximum power delivered to the load reaches 0.514 mW under 0.35g base excitation at 18.1 Hz. The numerical simulation results demonstrate that the proposed PEH could realize the high efficiency energy harvesting of low frequency ambient vibration. [ABSTRACT FROM AUTHOR]