压电能量收集器件基于有限元仿真比较和研究

利用压电材料制作的器件采集环境中的振动能量,并转化为电能的微尺度器件正日益受到广泛关注。通过有限元仿真分析,研究了新颖的垂直式纳米线阵列结构(VING)和常见的压电悬臂梁结构的能量收集性能。在更贴近实际情况的低频条件下计算了75 000根纳米线阵列结构和压电悬臂梁结构的输出电压以及单位体积能量输出功率,并指出了其各自的特点。最后得出结论:VING更适于在振动强度较大的环境中工作,而悬臂梁结构则更适于在接近其谐振频率的环境中工作。

Comparison and Study of Finite Element Analysis for Piezoelectric Energy Harvesting Devices

The devices based on the piezoelectric material used to collect the environmental vibration energy and transfer to the electrical power increasingly attract great attention.The energy harvesting properties of the novel vertical-nanowire-array integrated nanogenerator(VING) and normal piezoelectric cantilever were studied through the finite element approach.The output vol-tage and energy output power in terms of per volume of a 75 000 nanowire-based VING and a traditional cantilever were calculated in a more practical way at the low frequency.The features of both devices are concluded as following: the VING is more suitable in an environment of large vibration amplitude,while the cantilever structure may work well in an environment whose vibration frequency is close to its resonant frequency.