摘要详情

ID / 提交时间

76 / 2023-09-05 22:23:56

标题

Design and analysis of a low-frequency vibration energy harvester with a piezoelectric stack and a negative stiffness structure

关键字

vibration energy harvester, piezoelectric stack, low-frequency vibration, negative stiffness structure

主题及专题

Special Sessions > SS12 - Intelligent Energy Sensing and Conversion technologies and Devices

状态

终稿

作者

Donglin Zou / Shanghai Jiaotong University

Zhushi Rao / Shanghai Jiao Tong University

摘要

Most vibrations in engineering are of low frequencies, so this study proposes a novel piezoelectric vibration energy harvester for low-frequency vibrations. The model consists of a piezoelectric stack, a vertical spring, and a negative stiffness structure (NSS). The NSS is introduced to reduce the resonance frequency of the piezoelectric stack, which consists of two horizontal springs and two connecting rods. The analytical expressions of optimal resistance load, optimal harvesting frequency, and harvesting power are derived. The results show that the NSS can dramatically decrease the optimal harvesting frequency and also greatly increase the energy harvesting efficiency near the optimal harvesting frequency. For the case considered in this study, the optimal harvesting frequency can be reduced from 70 Hz to 10.5 Hz and the maximum harvesting power is increased from 15.3 μW to 111.8 μW.