• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2015, Vol. 51 ›› Issue (6): 155-164.doi: 10.3901/JME.2015.06.155

• 可再生能源与工程热物理 • 上一篇    下一篇

一种宽频压电振动能量采集器的解析模型与试验研究

王光庆1 展永政1 金文平1 廖维新2   

  1. 1. 浙江工商大学信息与电子工程学院 杭州 310018;
    2. 香港中文大学机械与自动化工程学系 香港 999077 中国
  • 出版日期:2015-03-20 发布日期:2015-03-20
  • 基金资助:
    国家自然科学基金(51277165)、浙江省自然科学基金(Y1080037)、浙江省教育厅科研(Y201223050)和浙江工商大学青年人才计划(QY11-23)资助项目

Model and Experiments of a Broadband Piezoelectric Vibration Energy Harvester

WANG Guangqing1 ZHAN Yongzheng1 JIN Wenping1 LIAO Weihsin 2   

  1. 1. School of Information and Electronic Engineering, Zhejiang Gongshang University, Hangzhou 310018;
    2. Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong 999077, China
  • Online:2015-03-20 Published:2015-03-20

摘要: 为提高单频压电振动能量采集器的能量转换效率和工作频带,以带有弹性放大器的宽频压电悬臂梁振动能量采集器为研究对象,提出一种改进的集总参数机电耦合解析模型,通过引入参数修正因子和考虑悬臂梁的振型信息,利用能量守恒原理和曲线拟合方法确定解析模型的等效参数,并根据力学、电学平衡原理建立系统的运动控制方程、频率特性方程和电功率输出表达式;仿真分析能量采集器质量比、刚度比、阻尼比以及负载电阻等对系统振动特性、电输出特性及负载特性的影响;研制宽频压电悬臂梁振动能量采集器原理样机,搭建试验系统,对解析模型进行验证。结果表明:增大弹性放大器与压电悬臂梁的刚度比和质量比以及减小弹性放大器与压电悬臂梁的阻尼比可以提高能量采集器的转换效率和工作频带。

关键词: 弹性放大器, 机电耦合模型, 宽频带, 试验分析, 压电能量采集器

Abstract: In order to improve the energy transferring efficiency and the operating frequency bandwidth, focusing on a type of broadband piezoelectric cantilever vibration energy harvester (B-PCVEH) with an elastic magnifier (EM), an improved lumped parameter coupled electromechanical model of the B-PCVEH is proposed. The model equivalent parameters are determined though the energy conversion principle and the curve fitting method by considering a correction factor and the shape information of the cantilever, and then the governing equations of motion, the frequency function and the electrical output power of B-PCVEH are derived according to the mechanics and electronics equilibrium principles. The effects of the structural parameters (such as mass ratio, stiffness ration, and damping ratio and load resistance) on the frequency performance, the vibration performance and the electric output performance of the B-PCVEH are researched by numerical simulations. The prototype of the B-PCVEH and the experiment setup are developed, and the accuracy of the output performance in the numerical solutions is identified from the experimental results. A reasonable agreement is found between the numerical results and the experimental results. The results show that larger mass and stiffness ratios and smaller damping ratio of the EM and the cantilever piezoelectric beam are helpful to improve the energy transferring efficiency and the frequency bandwidth of the B-PCVEH.

Key words: broadband, elastic magnifier, electromechanical model, experiment analysis, piezoelectric energy harvester

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