摘要
该文提出了一种基于弹簧振动平台的上变频压电俘能器,解决了低频振动能量收集效率低的问题。分析了压电悬臂梁输出功率与激励频率的三次方正相关,解释了采用上变频收集低频振动能量的原因。应用赫兹接触理论分析了拨片与压电悬臂梁的接触力,建立了拨动式激励的压电俘能器机电耦合模型。在综合考虑重叠长度和拨片厚度等影响因素后,选取厚度0.1 mm矩形不锈钢拨片。实验表明,在1 g(g=9.8 m/s^(2))、5.67 Hz的激励信号下,单拨动式上变频V25W型压电悬臂梁输出功率可达9.6 mW,具有很强的低频能量收集性能。
In this paper,a frequency up-conversion piezoelectric energy harvester based on a type of spring vibration platform is proposed to solve the problem of low efficiency of low-frequency vibration energy harvesting.The cubic positive correlation between the output power of piezoelectric cantilever beam and the excitation frequency is analyzed,and the reason for harvesting low frequency vibration energy by up-conversion is explained.The Hertzian contact theory is used to analyze the contact-force between the plucking plate and the piezoelectric cantilever beam,and the electromechanical coupling model of the piezoelectric energy harvester with the plucking excitation is established.After comprehensively considering the influencing factors of the overlapping length and the thickness of the plucking plate,the rectangular stainless steel plate with a thickness of 0.1 mm is selected.The experiment shows that the output power of the single-plucking up-conversion V25W piezoelectric cantilever beam can reach 9.6 mW under the excitation of 1 g(g=9.8 m/s^(2))and 5.67 Hz,which has strong low-frequency energy harvesting performance.
作者
吴新雅
董维杰
WU Xinya;DONG Weijie(Faculty of Electrical Information and Electrical Engineering,Dalian University of Technology,Dalian 116024,China;School of Electrical Engineering,Dalian University of Technology,Dalian 116024,China)
出处
《压电与声光》
CAS
北大核心
2022年第5期773-778,共6页
Piezoelectrics & Acoustooptics
基金
国家重点研发计划基金资助项目(2019YFB2005900)。
关键词
压电悬臂梁
能量收集
低频振动
上变频
振动位移放大
piezoelectric cantilever beam
energy harvesting
low frequency vibration
frequency up-conversion
vibration displacement amplification
