交变载荷作用下Cymbal换能器的压电性能

Piezoelectric effect of Cymbal transducer under action of alternating force

Cymbal换能器具有较高等效压电常数的特点,使其可能成为开辟新能源的一条有效途径。采用有限元方法对该换能器共振和非共振交变载荷作用下的电耦合场进行分析。计算结果表明,Cymbal换能器在共振交变载荷作用下所产生的开路电压很高,但由于此时所产生的应力较高,使得换能器工作失效;而在低频非共振交变载荷作用下该换能器能够正常工作,并产生与载荷同频率的具有一定幅值的交变电压。仿真结果表明,Cymbal换能器在非共振低频状态下,可以产生与载荷力同周期的具有一定大小的电压,可作为收集常见低频振动将机械能转化为电能的压电换能元件。

That the characteristics of higher piezoelectric effect of Cymbal transducer makes it to be an effective approach to obtain novel power.The mechanical stress and electrical potential distributions of Cymbal transducers under resonance and non-resonance alternating force were novelty analyzed with the Finite Element Method（FEM）.The simulation results showed that the short-circuit voltage under the alternating force with resonance frequency is higher.The generated stress is so higher that Cymbal transducer becomes invalid.Meanwhile,the transducer can normally work under the equal force with lower frequency.The alternating voltage can be obtained with certain amplitude and the same frequency as the alternating force.That makes Cymbal transducer to be possible for energy harvesting as piezoelectric element in common lower frequency vibration sources.