三向压电悬臂梁振动能量采集器的研究  

Three-dimensional piezoelectric cantilever-beam energy harvester

作　　者：马骁骏 冷永刚[1] 刘进军[1] 范胜波[1] MA Xiaojun;LENG Yonggang;LIU Jinjun;FAN Shengbo(School of Mechanic Engineering,Tianjin University,Tianjin 300310,China)

机构地区：[1]天津大学机械工程学院,天津300310

出　　处：《振动与冲击》2018年第22期57-66,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金(51675370);天津市应用基础与前沿技术研究计划(15JCZDJC32200)

摘　　要：为实现空间各方向振动能量的获取,设计了一种压电悬臂梁式三维振动能量采集器。系统动力学建模以及势函数和非线性磁铁力的分析,揭示了采集器通过双稳或单稳振荡特性而有效获取空间各方向振动能量的机制。仿真模拟和实验测试结果表明,对于一定带宽和强度的随机激励,系统至少存在一个最优的初始磁铁间距,可在两个坐标轴方向同时实现最优机电能量转换,同时保证第三个方向上的次优。对于实际振动环境,确定一个最优的初始磁铁间距,可实现高效的、结构间距无需实时调整的振动能量获取。In order to harvest vibration energy in any direction, a three-dimensional energy harvester was proposed. Its monostable or bistable oscillation characteristics of each cantilever increase the efficiency of energy harvesting. The system dynamic modeling and the nonlinear magnet force in analysis were implemented. The simulation results were compared with experimental results, and the optimization of the structure was carried out. It is shown that in a certain bandwidth and intensity range of random excitation, in the system exists at least one magnet gap which leads to the peak values of output voltages in two axes directions, meanwhile ensures a high-level second optimum in the third axis direction. By adjusting this optimal distance, the energy harvesting can be kept in a high-efficiency state without structural adjustments in real vibrational environment.

关 键 词：振动能量采集 压电悬臂梁 三维方向 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3