摘要
为避免驰振俘能器高流速下PZT损坏,使其能在复杂工作环境中具有稳定的输出特性,该文提出了一种利用磁力控制悬臂梁振动幅值的压电-电磁复合俘能器(GPEEH)。引入的非线性磁力可以调控钝体的振幅,提高驰振压电俘能器(PEH)的输出稳定性,改善其对高风速环境的适应性,且能够增加复合俘能器的输出电压。在搭建风洞实验平台和制作实验样机的基础上,研究不同负载电阻、风速、关键结构参数d 0和d 1对俘能器输出特性的影响规律。实验结果表明,当PEH钝体的振幅被磁力限制在一定区间时,钝体的振动频率和速度随着风速的升高而逐渐增加。风速为11.5 m/s时,PEH振动主频率(6.3 Hz)是风速为8.4 m/s时PEH振动主频率(4.3 Hz)的1.4倍。当风速为12 m/s,GPEEH的输出功率为6.18 mW,相较于单一驰振压电俘能器的输出功率提高了47%。其中当风速达到10.5 m/s时,PEH和电磁俘能器(EEH)的输出功率均趋于稳定。
In order to avoid the damage of PZT of galloping energy harvester under high flow rate and ensure stable output characteristics in complex working environment,a galloping piezoelectric-electromagnetic energy harvester(GPEEH)using magnetic force to control the vibration amplitude of cantilever beam is proposed in this paper.The introduced nonlinear magnetic force can control the amplitude of the bluff body,improve the output stability of PEH,improve its adaptability to high wind speed environment,and increase the output voltage of the composite energy harvester.The influences of different load resistance,wind speed,key structural parameters d 0 and d 1 on the output characteristics of the energy harvester are investigated by using the fabricated wind tunnel experimental platform and the experimental prototype.The experimental results show that when the amplitude of the PEH bluff body is limited to a certain range by the magnetic force,the vibration frequency and velocity of the bluff body gradually increase with the increase of the wind speed.The main frequency of PEH vibration(6.3 Hz)at wind speed of 11.5 m/s is 1.4 times that of PEH vibration(4.3 Hz)at wind speed of 8.4 m/s.The output power of GPEEH is 6.18 mW at wind speed of 12 m/s,which is 47%higher than that of a single galloping piezoelectric energy harvester.When the wind speed reaches 10.5 m/s,the output power of PEH and EEH tends to be stable.
作者
李霞
许云威
刘本学
苏宇锋
田海港
LI Xia;XU Yunwei;LIU Benxue;SU Yufeng;TIAN Haigang(School of Mechanical and Power Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《压电与声光》
CAS
北大核心
2024年第1期128-135,共8页
Piezoelectrics & Acoustooptics
基金
国家自然科学基金青年基金资助项目(52307253)
中国博士后科学基金特别资助(站前)(2023TQ0314)
河南省重点研发与推广专项(科技攻关)(232102221013)。
关键词
风致振动
压电俘能
电磁俘能
驰振复合俘能器
磁力调控
wind-induced vibration
piezoelectric harvesting
electromagnetic energy harvesting
galloping vibration hybrid energy harvester
magnetic control
