摘要
为提高悬臂梁压电俘能器的俘能效率,提出了一种冲击式悬臂梁压电俘能器。该俘能器包括多个悬臂梁压电振子,可在风力、人体动力能及环境振动能等多种外载荷作用下产生电能。俘能器的核心部件是悬臂梁压电振子,通过冲击实验发现悬臂梁压电振子在周期性冲击载荷作用下拓宽了共振频率,同时提高了输出功率。测试结果显示在频率约为21Hz的方波冲击信号下,外接电阻为50kΩ时,单个悬臂压电俘能器最大输出功率可达0.28mW;当频率分别为5Hz、8.5Hz时,还可分别输出0.07mW和0.17mW的功率,俘能器出现多个峰值电功率。研究表明所设计的冲击式压电俘能器可有效提高俘能效率。
An impact cant i lever piezoelectr ic harvester which consists of mul tiple cant i lever piezoelectr ic vibrator was proposed to improve the harvesting efficiency. The harvester could generate electric power under the functions of some outer loads such as wind, body kinetic energy and environmental vibration energy. The core part of the har-vester wass the cantilever piezoelectric vibrator. The impact test wass carried out and the result shows that the reso-nance frequency is broadened by the action of the periodic impact load and the output power was improved. The test results show that the maximal output power of the single cantilever piezoelectric vibrator was about 0. 28 mW when the frequency of the square wave impact signal wass about 21 Hz and the load was 50 kH. When the frequency was about 5 Hz and 8. 5 Hz, the output power was 0. 07 mW and 0. 17 mW respectively. The research showed that the impact cantilever piezoelectric harvester could improve the power harvesting effectively.
出处
《压电与声光》
CSCD
北大核心
2017年第3期426-429,432,共5页
Piezoelectrics & Acoustooptics
基金
国家自然科学基金资助项目(51175359)
2014年度江苏省第四期"333工程"科研基金资助项目(BRA2014086)
"青蓝工程"基金资助项目
关键词
冲击
悬臂梁
压电俘能器
共振
振子
impact
cantilever
piezoelectric harvester
resonance
vibrator
