基于滚压的压电叠堆压电转换特性仿真分析

本文提出一种基于滚压的压电俘能器结构,结合Cymbal压电换能器和压电振子叠堆,利用滚珠作为激励源,可以把机构的往复振动转换为对压电振子的单向压迫.使用仿真软件对俘能器结构中滚珠压迫压电单元的力,以及该俘能器结构在并联和串联模式下输出的电压和俘获的电能进行仿真分析,得到该结构的压电转换特性.仿真结果表明,滚珠对压电叠堆的压迫力与压电陶瓷层数并不是单向递减,1-5层时递增,5层以后压迫力逐渐减小.在压电陶瓷的总层数不变的情况下,并联和串联时压电叠堆所俘获的总电能是不变的.两种联接模式下总电能随层数的变化关系为5层以内时随层数的增加而减小,超过5层后逐渐增加.

Simulation analysis on piezoelectricity conversion characteristics of piezoelectric stack based on rolling depression

The paper proposes a piezoelectric stack structure based on the rolling depression, which combines the Cymbal piezoelectric transducer and the piezoelectric vibrator stack to convert the reciprocating vibration into an one-way oppression of piezoelectric vibrator using the ball beating as the excitation source. Using the simulation software, the force on the piezoelectric unit produced by ball and the output voltage and trapped energy of transducer structure in parallel and series mode are examined, and the piezoelectric conversion characteristics of the structure are obtained. The simulation results show that the ball force on the piezoelectric stack does not always decrease with the increase of the number of piezoelectric layers. It increases gradually during 1-5 layers of piezoelectric ceramic, but decreases in the more than 5 layers. Meanwhile, it is found that if the total number of the layers of piezoelectric ceramics is unchanged, the total energy trapped by piezoelectric stack remains the same. However, when the number of layers is less than 5, it decreases with the increase of the number, but it gradually increases when the layers are more than 5.