基于柔性弹簧应力调制的可调谐共振频率电磁振动能量采集器

Electromagnetic Vibration Energy Harvester with Tunable Resonance Frequency Based on Stress Modulation of Flexible Springs.

作者信息

Li Yunjia, Zhou Chenyuan, Cao Qi, Wang Xinyi, Qiao Dayong, Tao Kai

机构信息

School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

Micro and Nano Electromechanical Systems Laboratory, Northwestern Polytechnical University, Xi'an 710072, China.

出版信息

Micromachines (Basel). 2021 Sep 20;12(9):1130. doi: 10.3390/mi12091130.

DOI:10.3390/mi12091130

PMID:34577772

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8467080/

Abstract

This paper presents a compact electromagnetic vibrational energy harvester (EVEH) with tunable resonance frequency. The resonance frequency of the EVEH is tuned by adjusting the axial stress in the flexible polymeric springs, which is realized by physically pulling and pushing the springs. The stress tuning functionality is realized with a compact structure with small volume. The total frequency tuning range of the proposed EVEH is 56 Hz (74-130 Hz), which is 64% of the natural resonance frequency of the EVEH (88 Hz). It is found that the tensile stress increases the resonance frequency of the EVEH, while the compressive stress firstly reduces the resonance frequency and then increases the resonance frequency due to buckling.

摘要

本文提出了一种具有可调谐共振频率的紧凑型电磁振动能量采集器（EVEH）。通过调节柔性聚合物弹簧中的轴向应力来调谐EVEH的共振频率，这是通过物理推拉弹簧来实现的。应力调谐功能通过具有小体积的紧凑结构来实现。所提出的EVEH的总频率调谐范围为56 Hz（74 - 130 Hz），占EVEH自然共振频率（88 Hz）的64%。研究发现，拉伸应力会增加EVEH的共振频率，而压缩应力首先会降低共振频率，然后由于屈曲又会增加共振频率。