双稳态磁致伸缩能量采集器的动态特性
付美真，曹淑瑛，瞿林飞，郑加驹，王博文
（河北工业大学 电磁场与电器可靠性省部共建重点实验室，天津 300130）
摘 要：介绍了利用非线性来提高磁致伸缩能量采集系统效率的原理，建立了双稳态磁致伸缩能量采集器的集中参数模型，给出了两磁体之间的磁力数学表达式并验证了其正确性。分析了磁体之间的距离对系统特性的影响，结果表明：在外部非线性磁力的作用以及合适的磁体间距下，磁致伸缩悬臂梁会构成一个双稳态系统；相同激励幅值下，通过改变激励频率和磁体间距形成双稳态特性，可提高能量的采集效率。
关键词：Galfenol 悬臂梁；振动能量采集；磁力；磁机电耦合
中图分类号：TM153；TM619 文献标识码：A 文章编号：1007-3175(2017)02-0013-05
Dynamic Characteristics of Bistable Magnetostrictive Energy Harvester
FU Mei-zhen, CAO Shu-ying, QU Lin-fei, ZHENG Jia-ju,WANG Bo-wen
（Province-Ministry Joint Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability,
Hebei University of Technology, Tianjin 300130, China）
Abstract: Introduction was made to the principle using the nonlinear to improve the efficiency of the magnetostrictive energy harvesting system. This paper established a lumped parameter model of bi-stable magnetostrictive energy harvester, gave the magnetic force mathematical expressions between two magnetic bodies and verified their correctness. This paper analyzed the impacts of the distance between the magnets on the system characteristics. The results show that in the nonlinear effect of external magnetic and suitable magnet spacing, the magnetostrictive cantilever would constitute a bi-stable system, and under the same excitation amplitude, the excitation frequency and magnet spacing were changed to form bi-stable state characteristic, which could improve the efficiency of energy harvesting.
Key words: Galfenol cantilever; vibration energy harvesting; magnetic force; magnetic electromechanical coupling
参考文献
[1] 杨晓光，汪友华，张波，等. 一种新型振动发电装置及其建模与实验研究[J]. 电工技术学报，2013，28(1)：113-118.
[2] 赵志刚，丁旭升，刘福贵，等. 微型电磁式振动能量采集器的结构设计与仿真研究[J]. 电工技术学报，2012，27(8)：255-260.
[3] ARRIETA A F, HAGEDORN P, ERTURK A, INMAN D J.A piezoelectric bistable plate for nonlinear broadband energy harvesting[J].Applied Physics Letters，2010，97(10)：104102.
[4] LIN J T, LEE B, ALPHENAAR B.The magnetic coupling of a piezoelectric cantilever for enhanced energy harvesting efficiency[J]. Smart Materialsand Structures，2010，19(19)：045012.
[5] 陈仲生，杨拥民. 悬臂梁压电振子宽带低频振动能量俘获的随机共振机理研究[J]. 物理学报，2011，60(7)：074301.
[6] 孙舒，曹树谦. 双稳态压电悬臂梁发电系统的动力学建模及分析[J]. 物理学报，2012，61(21)：210505.
[7] WANG L, YUAN F G.Vibration energy harvesting by magnetostrictive material [J]. Smart Materials and Structures，2008，17(4)：45009.
[8] 曹淑瑛，桑杰，郑加驹，等.Galfenol 悬臂梁能量采集器的机电耦合动态模型[J]. 中国电机工程学报，2015，35(21)：5623-5631.
[9] YOO J H, FLATAU A B.A bending-mode galfenol electric power harvester[J]. Journal of Intelligent Material Systems and Structures，2012，23(6)：647-654.
[10] REZAEEALAM B, UENO T, YAMADA S.Finite element analysis of galfenol unimorph vibration energy harvester[J]. IEEE Transactions on Magnetics，2012，48(11)：3977-3980.
[11] DENG Z, DAPINO M J.Modeling and design of Galfenol unimorph energy harvesters[J]. Smart Materials and Structures，2015，24(12)：18-28.
