基于压电薄膜材料PVDF的能量采集结构研究

Study on energy acquisition structure based on PVDF piezoelectric thin film materials

为了提高基于PVDF压电材料的能量采集效率,利用COMSOL Multiphysics有限元分析软件对双晶压电悬臂梁进行研究。首先,对悬臂梁结构的压电振子进行了稳态分析、模态分析和谐响应分析,同时对4种不同基板材料压电振子电压输出特性做了研究比较;其次,对悬臂梁压电振子结构进行了优化设计。对其形状的研究表明:矩形悬臂梁的输出电压最高;随着悬臂梁的长宽比增加,其输出电压逐渐增大;在压电材料面积固定时,增加长度、减小宽度都能提高输出电压,为设计最佳的能量采集器提供理论依据。

In order to improve the energy acquisition efficiency of piezoelectric materials based on PVDF, the double crystal piezoelectric cantilever beam was studied by COMSOL Multiphysics. Firstly, the steady-state analysis, modal analysis and harmonic response analysis of the piezoelectric vibrator were carried out. The output voltage characteristics of four kinds of piezoelectric vibrators with different substrates were studied and compared. Secondly, the piezoelectric vibrator structure of cantilever beam was optimized. The results show that the output voltage of the rectangular cantilever beam is the highest, and the output voltage increases with the increase of the aspect ratio of the cantilever beam. When the area of piezoelectric material is fixed, the output voltage will increase by increasing the length and decreasing the width, which provides the theoretical basis for the design of the best energy collector.