压电阵列径向分布的二维振动能量采集器

为了有效采集多个方向的振动能量,本文提出了一种圆柱形的压电阵列径向分布的二维(2D)振动能量采集器。通过将柔性弧形压电阵列径向分布在圆柱体上,该采集器可以收集到二维(2D)平面内任意方向的振动能量。同时,引入了角度带宽来描述采集器获取二维振动能量的能力。实验结果表明:这种新型结构采集器的角度带宽接近180°;而且,通过把对称位置的聚偏二氟乙烯(PVDF)压电元件进行反向串联,采集器的最大输出电压可以达到11.6V;当把对称位置的聚偏二氟乙烯(PVDF)压电元件反向并联时,最大输出功率达到13.5μW。与传统的悬臂式压电振动能量采集器相比,该二维(2D)采集器具有更好的多方向振动能量采集性能。

Two-dimensional vibration energy harvester with radially distributed piezoelectric array

In order to effectively collect vibration energy from multiple directions, a Piezoelectric Vibration Energy Harvester (PVEH) with a radially distributed piezoelectric array was proposed for scavenging two-dimensional (2D) vibration energy. By employing an arc-shaped piezoelectric array that was radially distributed on a flexible cylinder, the proposed harvester could scavenge vibration energy from various directions in a 2D plane. A novel concept, termed angle bandwidth, has also been introduced for describing the ability of harvesting 2D vibration energy. The obtained experimental results show that the proposed design can achieve a large angle bandwidth of approximately 180°. Furthermore, the maximum output voltage of the PVEH can reach a value of 11.6 V by connecting the symmetric polyvinylidene fluoride (PVDF) elements in series, whereas the maximum output power can attain a value of 13.5 μW by connecting the symmetric PVDF elements in parallel. Hence, compared to a traditional cantilever-shaped PVEH, the proposed 2D PVEH possesses superior ability for harvesting multi-directional vibration energy.