摘要
低频振动能量在环境中普遍存在,如何高效收集却始终是一个难题。设计了一种基于普通金属夹的压电弹簧摆结构,由于摆动固有频率仅与软件仿真摆长和重力加速度有关,因此结构共振频率能够较好地匹配环境低频振源,进而高效地将其转化为电能。利用有限元仿真软件仿真并讨论了压电元件的优化布置方案,建立了结构动力学方程,最终搭建实验平台进行了理论验证,性能分析和能量收集器的自供电演示。实验结果表明,该压电弹簧摆结构在超低频条件下(2.03 Hz,0.26 g),回收功率能够达到13.29 mW,具有很高的低频振动能量收集性能。
Low-frequency vibration is a ubiquitous energy that exists almost everywhere,but a high efficient harvesting of which remains challenging.This paper designs a piezoelectric spring pendulum structure based on common binder metal clips.Because the pendular resonance only depends on the length of pendulum and gravity,the resonant frequency can therefore match the low-frequency vibration sources very well,and the mechanical energy can be efficiently transferred into electrical energy.The optimization layout of the glued piezoelectric ceramics is discussed through the finite element software,and the structure dynamic equation is modeled theoretically.Finally,an extensive measurement campaign has been performed on an experimental platform in order to collect results that show the suitability of the proposed approach.Results and comparison with the literature show that the presented device has a very high output power of 13.29 mW at the condition of ultra-low frequency vibration source(2.03 Hz,0.26 g).
作者
吴义鹏
周圣鹏
裘进浩
季宏丽
WU Yi-peng;ZHOU Sheng-peng;QIU Jin-hao;JI Hong-li(State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2019年第5期750-756,共7页
Journal of Vibration Engineering
基金
国家自然科学基金青年基金资助项目(51705251)
江苏省自然科学基金资助项目(BK20160790)
关键词
能量收集
弹簧摆
压电
超低频振动
energy harvesting
spring pendulum
piezoelectric
ultra-low frequency vibration
