摘要
通过对压电单晶悬臂梁振动发电机陶瓷片建模及理论计算,分析了一阶振型与二阶振型状态下陶瓷片不同贴片位置与振动发电机发电能力的关系,利用欧拉伯努利梁模型并通过电机开路电压、短路电流及LED照明试验,得到了最佳贴片位置。试验表明在一阶模态时,陶瓷片贴于悬臂梁根部的电机能够获得最大的发电量,对4种不同贴片位置电机的发电试验显示,陶瓷片贴于根部的电机其开路电压及短路电流分别是其他电机的4倍以上,驱动的LED功率为其他电机的10倍以上。而对于二阶振型,陶瓷片贴于悬臂梁中间位置的电机发电量最大,贴于根部位置的电机次之,6种不同贴片位置电机的发电试验表明,前者开路电压、短路电流分别为后者的1.2倍和1.9倍以上,两者驱动的LED功率相差1.4倍以上。试验结果与计算结果均表明:一、二阶模态时悬臂梁最佳贴附位置分别是根部和中间位置,设计时需根据不同振型选择陶瓷片最佳粘贴位置。
By modeling and calculating the piezoelectric ceramic patches of cantilever generators,the effects of different positions of the piezoelectoic patches on the generation ability of the generators were analyzed and the optimum positions of the piezoelectric ceramic patches under the first and second vibration modes were obtained with Euler-Bernoulli model and by testing the open circuit voltages,short-circuit currents of generators and the performance of LED lighting.Experiments indicate that the generators show the optimum performance under the first vibration mode when the piezoelectric ceramic patches locate at the root of the cantilever.Its opening voltage and short current are 4 times and LED power is 10 times of experimental data of other three generators.Moreover,the generation ability is investigated under the second vibration mode.When the ceramic patch respectively locates at the middle and the root of cantilever,the generation ability of the former is superior to that of the latter,and the opening voltage and short current of the former are 1.2 and 1.9 times those of latters respectively through six generator experiments.In addition,LED power of the former is 1.4 times those of the others.It points out that the piezoelectric ceramic patches should be located at the root of beam under the first vibration mode and at the middle of beam under the second mode to improve the generation efficiency.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2011年第8期1801-1809,共9页
Optics and Precision Engineering
基金
上海市人才发展基金资助项目(047)
上海大学研究生创新基金资助项目(No.SHUCX102191)
关键词
压电发电机
陶瓷片
悬臂梁
振型
piezoelectric cantilever
ceramic patch
generator
vibration mode
