Study of a 2DOF bistable energy harvester with variable potential well for ultra-low frequency vibration energy harvesting

作者：Jun Chen, Mingjie Guan, Ziqiao Shen, Qingyuan Zhu, Yunbo Ning · 发表于：Review of Scientific Instruments · 年份：2025 · DOI：10.1063/5.0243198 · 被引用次数：5 · 研究领域：Innovative Energy Harvesting Technologies、Energy Harvesting in Wireless Networks、Advanced Sensor and Energy Harvesting Materials

A two-degree-of-freedom bistable energy harvester with a spring-magnet oscillator designed for ultra-low frequency vibration energy harvesting is presented in this paper. It combines magnetic plucking frequency upconversion and a variable potential function to achieve a high-efficiency response while also being suitably installed for applications with spatial limitations. A lumped parameter model of the piezoelectric energy harvester and the magnetic dipoles is applied to develop the theoretical model for the system. The prototype is fabricated, and experimental parameter investigations are undertaken to examine the effects of various factors, including magnetic distance, stiffness, and tip mass. The results indicate that at a frequency of 1.2 Hz and an acceleration of 0.23 g, the maximum output power reaches 264.6 µW at an optimal resistance of 250 kΩ.