并联磁力耦合式俘能器及其特性研究
吴明轩，凌元淮
（西南交通大学 机械原理教研室，四川 成都 610031）
摘要：传统双稳态悬臂梁压电俘能器存在效率低、频带窄的弊端。为了提高俘能频带，本文提出一种并联磁力耦合式压电悬臂梁俘能装置，引入了磁力的耦合及压电片的并联。通过建立集中参数的的数学模型，使用龙格库塔数值仿真法对比分析了简谐激励下并联磁力耦合式压电悬臂梁俘能装置与单悬臂梁双稳态俘能器的运动状态及俘能特性。最后搭建实验平台进行实验验证。结果表明，磁力耦合和并联的加入，使得并联耦合式压电俘能器较传统单悬臂梁俘能器分别在7 Hz与15 Hz具有两个谐振频率，增宽了俘能器的俘能频带，以输出功率大于8×10-6 W为有效频带，则俘能带宽提高约为19%。
关键词：并联磁力耦合式俘能器；压电俘能；磁力耦合；非线性；能量收集；非线性动力学
中图分类号：TH113 文献标志码：A doi：10.3969/j.issn.1006-0316.2021.12.004
文章编号：1006-0316 (2021) 12-0027-09
Parallel Magnetically Coupled Energy Harvester and Its Characteristics
WU Mingxuan，LING Yuanhuai
( Department of Mechanical Theory, Southwest Jiaotong University, Chengdu 610031, China )
Abstract：The traditional bistable cantilever beam piezoelectric energy harvester has the problems of low efficiency and narrow frequency band. In order to improve the frequency band, a parallel magnetically coupled piezoelectric cantilever beam energy harvester is proposed. The magnetically coupling and the parallel connection of the piezoelectric plates are introduced. Through the establishment of the mathematical model of the lumped parameters, the motion state and energy harvesting characteristics of the proposed energy harvester and the single cantilever beam bistable energy harvester under simple harmonic excitation were compared and analyzed using Runge-Kutta numerical simulation method. Finally, an experimental platform was built for experimental verification. The results show that the addition of magnetically coupling and parallel connection provides the proposed energy harvester with two resonant frequencies at 7 Hz and 15 Hz respectively, compared with the traditional single cantilever beam energy harvester, which widens the energy harvesting frequency band of the device. Taking output power of more than 8×10-6 W as the effective frequency band, the energy harvesting bandwidth increases by about 19%.
Key words：parallel magnetically coupled energy harvester；piezoelectric energy harvesting；magnetic coupling；nonlinear；energy harvesting；nonlinear dynamics
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收稿日期：2021-04-14
基金项目：四川省科技计划项目重点研发项目（2021YFS0065）
作者简介：吴明轩（1995－），男，四川内江人，硕士研究生，主要研究方向为压电俘能，E-mail：wumx1995@163.com。凌元淮（1996－），男，四川凉山人，硕士研究生，主要研究方向为送变电线路建设技术。
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