上下梁磁吸斥力双稳态压电能量采集器  

The bistable piezoelectric energy harvester with magnetic attraction and repulsion between upper and lower beams

作　　者：金鸿 汤宝平[1] 赵春华 杜思玉 Jin Hong;Tang Baoping;Zhao Chunhua;Du Siyu(State Key Laboratory of Mechanical Transmission,Chongqing University,Chongqing 400030,China)

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400030

出　　处：《仪器仪表学报》2024年第9期323-330,共8页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(52375082)项目资助。

摘　　要：针对压电能量采集中的单悬臂梁频带窄与双稳态势阱较大难以跨越的问题,设计了上下梁磁吸斥力双稳态压电能量采集器。首先,构建了互相激励的上下梁和外部固定磁铁的磁吸斥力双稳态结构,拓宽结构的振动响应与工作频带;通过将磁铁等效为磁偶极子建立平面磁力模型,获得不同参数对结构势能和磁力的影响;然后,基于欧拉-伯努利梁理论和拉格朗日方程建立系统的动力学模型,分析系统动力学特性的影响规律;通过实验结果表明,与无固定磁体的单上梁和单下梁相比,所提的上下梁磁吸斥力双稳态压电能量采集器实现了上悬臂梁的工作频带范围由5~6 Hz扩大到3~11 Hz,3~11 Hz上振动的平均功率提高了26.35%,下悬臂梁的工作频带范围由13~14 Hz扩大到4~13 Hz,4~13 Hz上振动的平均功率提高了23.28%。To address the problems of narrow frequency bands and significant barriers posed by bistable potential wells in piezoelectric energy harvesting with single cantilever beams,a novel solution is proposed by utilizing the bistable piezoelectric energy harvester employing magnetic attraction and repulsion between upper and lower beams.Firstly,a bistable structure with mutually-excited upper and lower beams and externally fixed magnets is constructed to broaden the vibration response and operational frequency range of the structure.By modeling the magnets as magnetic dipoles and establishing a planar magnetic force model,the impact of different parameters on the structural potential energy and magnetic force are determined.Subsequently,based on Euler-Bernoulli beam theory and Lagrangian equations,a comprehensive dynamic model of the system is formulated to analyze the influence of dynamic characteristics on the system.Experimental results show that,compared with the single upper or lower beams without fixed magnets,the proposed bistable piezoelectric energy harvester with magnetic attraction and repulsion expands the operational frequency range of the upper cantilever beam from 5~6 Hz to 3~11 Hz,resulting in a 26.35%increase in average power output within the 3~11 Hz band.Similarly,the operational frequency range of the lower cantilever beam is extended from 13~14 Hz to 4~13 Hz,with a 23.28%enhancement in average power output within the 4~13 Hz range.In response to the challenges of narrow frequency bands and significant barriers posed by bistable potential wells in piezoelectric energy harvesting with single cantilever beams,a novel solution has been devised:the bistable piezoelectric energy harvester employing magnetic attraction and repulsion between upper and lower beams.Firstly,a bistable structure with mutually-excited upper and lower beams and externally fixed magnets has been constructed to broaden the vibration response and operational frequency range of the structure.By modeling the magnets as magnetic dipol

关 键 词：双稳态 磁吸斥力 上下梁 振动能 

分 类 号：TP393.1[自动化与计算机技术—计算机应用技术] TH17[自动化与计算机技术—计算机科学与技术]