摘要
提出了一种二级阶梯变厚度悬臂梁压电俘能器,利用传递矩阵法和有限元仿真分析了结构振动的固有频率,研究了压电悬臂梁的几何参数对固有频率的影响,并将计算结果进行对比,得到了很好的一致性.最后,仿真得到了这种俘能器的输出电压频响曲线.研究结果表明,与传统的等厚度悬臂梁压电俘能器相比,所设计的阶梯变厚度悬臂梁压电俘能器具有优异的低频特性,通过改变几何参数可以有效调控俘能器的共振频率,使其接近环境的振动频率,从而使得输出电压达到最高.研究结果可为采集环境中的低频振动能量,实现低功耗微电子元器件的自供电提供设计的理论依据.
A piezoelectric energy harvester with two-stepped variable thickness cantilever beam was proposed.The natural frequency of structural vibration was analyzed based on the transfer matrix method and finite element simulation.The influences of the geometric parameters of the beam on the natural frequencies were discussed and compared with the results of the two methods,a good agreement was obtained.Finally,the frequency-response curves of the output voltage were simulated for the energy harvester.Results show that the proposed structure is more effective than the traditional uniform beam for the low-frequency energy harvester.When the natural frequency of the energy harvester,which was designed by controlling the geometric parameters,is near the ambient vibration frequency,the energy harvester obtains high output voltage.This investigation can provide theoretical support for low-frequency energy harvesting that can be used for self-powered low-power electronics.
作者
曹东兴
高彦辉
胡文华
CAO Dongxing;GAO Yanhui;HU Wenhua(College of Mechanical Engineering and Applied Electronics Technology,Beijing University of Technology,Beijing 100124,China;Beijing Key Laboratory of Nonlinear Vibrations and Strength of Mechanical Structures,Beijing 100124,China;School of Mechanical Engineering,Tianjin University of Technology,Tianjin 300384,China)
出处
《北京工业大学学报》
CAS
CSCD
北大核心
2020年第7期719-726,共8页
Journal of Beijing University of Technology
基金
国家自然科学基金资助项目(11672008)。
关键词
压电俘能器
变厚度悬臂梁
固有频率
低频振动
传递矩阵法
有限元仿真
piezoelectric energy harvester
cantilever beam with variable thickness
natural frequency
low-frequency vibration
transfer matrix method
finite element simulation
