Abstract: The nonlinear electromagnetic energy harvesting device has problems of high natural frequency, narrow working frequency band and low energy harvesting efficiency, so a nonlinear electromagnetic energy harvesting device with double-vortex planar spring structure is designed to solve them. First, finite element simulation is used to analyze the effects of geometric parameters on the double-vortex planar spring to determine the optimal geometric spring structure. Then, the energy harvester model is built and power generation mechanism is analyzed. According to numerical simulation and experimental test results, the double-vortex planar spring can change from linear characteristics to nonlinear characteristics as the excitation increases. When the excitation is 1g, open circuit voltage of the energy harvester reaches about 5 V, the maximum output power is 18 mW, and the working frequency band is about 5 Hz. Compared with other vibration energy harvesters, this one is more suitable for collecting low-frequency vibration energy, and has a better application prospect in the power supply system of wireless sensor networks.

    Key words: electromagnetic vibration energy harvesting ; planar spring ; nonlinear ; broadband

 

参考文献

[1] 马天兵，吴晓东，邹莉君，等. 无线传感器网络的压电能量收集技术研究[J] . 传感器与微系统，2019，38(6)：59-61．

[2] BAO Bin, WANG Quan, WU Nan, et al.Hand-held piezoelectric energy harvesting structure:Design，dynamic analysis，and experimental validation[J].Measurement，2021，174(9)：109011.

[3] GUO Xinge, ZHANG Yulong, FAN Kangqi, et al.A comprehensive study of non-linear air damping and “pull-in” effects on the electrostatic energy harvesters[J].Energy Conversion and Management， 2020，203：112264.

[4] LU Zhuang, WEN Quan, HE Xianming, et al.A nonlinear broadband electromagnetic vibration energy harvester based on double-clamped beam[J].Energies，2019，12(14)：2710.

[5] LIU Huicong, ZHONG Junwen, LEE Chengkuo, et al.A comprehensive review on piezoelectric energy harvesting technology: Materials，mechanisms，and applications[J].Applied Physics Reviews，2018，5(4)：041306.

[6] HUANG Manjuan, LI Yunfei, FENG Xiaowei, et al.A magnetic-coupled nonlinear electromagnetic generator with both wideband and high-power performance[J].Micromachines，2021，12(8)：912.

[7] SALAUDDIN M, PARK J Y.Design and experiment of human hand motion driven electromagnetic energy harvester using dual Halbach magnet array[J].Smart Materials and Structures，2017，26(3)：035011.

[8] YANG X, WANG C, LAI S K.A magnetic levitationbased tristable hybrid energy harvester for scavenging energy from low-frequency structural vibration [J] . Engineering Structures， 2020， 221：110789.

[9] ALDAWOOD G, NGUYEN H T, BARDAWEEL H.High power density spring-assisted nonlinear electromagnetic vibration energy harvester for low base-accelerations[J].Applied Energy，2019， 253(4)：113546.

[10] IQBAL M , MUHAMMAD N M , KHAN F , et al .Nonlinear multi-mode electromagnetic insole energy harvester for human-powered body monitoring sensors: Design，modeling ，and characterization[J].Proceedings of the Institution of Mechanical Engineers Part C:Journal of Mechanical Engineering Science，2021， 235(22)：6415-6426.

[11] 孙诗. 电磁式振动能量采集器非线性拓频方法研究[D]. 上海：上海交通大学，2018．

[12] 王志霞，王炜，张琪昌. 一类电磁式薄膜振动能量采集器动力学建模与非线性分析[J] . 振动与冲击，2019，38(15)：127-133．

[13] NAMMARI A, CASKEY L, NEGRETE J, et al.Fabrication and characterization of non-resonant magneto-mechanical low-frequency vibration energy harvester[J].Mechanical Systems and Signal Processing， 2018，102: 298-311.

[14] APO D J, PRIYA S.High power density levitationinduced vibration energy harvester[J].Energy Harvesting and Systems， 2014，1(1/2)：79-88.