低频力作用下压电发电模型及实验研究

Model and Experimental Study on Piezoelectric Generator Introduced by Low-Frequency Force

以PZT／PVDF复合压电材料采用热压工艺制备了压电厚膜，并制做了不锈钢／压电厚膜／金电极结构的压电振子。为了表征压电振子的阻抗特性，在室温下对样品介电特性进行了测量和分析。利用制备的压电振子采用简支支撑方式设计和制作了压电发电装置，运用压电方程对该装置建立了压电发电数学模型，并根据模型影响参数进行压电发电实验研究。实验结果表明，单片压电厚膜在外加作用力频率从0～2Hz发生变化时，在负载电阻值为105k1）左右时单个压电振子可以获得约130μw的最大输出电功率。研究中还发现增加并联的厚膜片数目可以成比例的增加输出功率。

Piezoelectric thick films PZT/PVDF were prepared using piezoelectric composite materials through which a piezoelectric vibrator was designed with a structure of stainless steel,/piezoelectric thick films/Au （top electrode）. To determine the impedance of the piezoelectric vibrator the dielectric properties of the thick films were measured and analyzed at room temperature. A piezoelectric generator is designed using piezoelectric vibrator supported by simply-supported beam, and the model of piezoelectric generator was established and experiments were executed to research the performance of the piezoelectric generator. The results show that, as the force frequency varying from 0 to 2 Hz and a 105 KΩ load resistor was connected, the maxim output power of piezoelectric generator with single piezoelectric thick film is about 130 μW. We also found that the output power increases proportional to the number of thick films in parallel.