Zhang Zheng, He Lipeng, Hu Renhui, Hu Dianbin, Zhou Jianwen, Cheng Guangming
College of Mechanical and Electrical Engineering, Changchun University of Technology, Changchun 130012, China.
Institute of Precision Machinery and Smart Structure, Zhejiang Normal University, Jinhua 321004, China.
Rev Sci Instrum. 2022 Aug 1;93(8):085003. doi: 10.1063/5.0093123.
In this paper, a compound cantilever beam based piezoelectric energy harvester (CCBPH) is proposed. This piezoelectric energy harvester uses vibrations caused by vortex excitation behind the winding fluid to harvest wind energy. In particular, this structure uses vortex excitation formed behind a vertically suspended cylindrical winding fluid to cause the vibration of the cylindrical winding fluid, which then indirectly excites the piezoelectric element. The CCBPH consists of a fixed support, a cantilever beam, magnet-1 and magnet-2, a support beam, two piezoelectric units-PVDF (polyvinylidene fluoride), a compound cantilever beam, and a cylindrical winding fluid. We investigated the parameters affecting the structure and verify the effectiveness of the energy harvester through the design of the structure, simulation analysis, and experiments. The experimental results show that the CCBPH can obtain the maximum output voltage from the energy harvester at a wind speed of 18 m/s. The maximum output power was achieved with an external load resistance of 2000 kΩ. By comparison, it is found that the maximum output power is 0.095 mW when the distance between two magnets is 20 mm and the mass ratio is 1:2 for copper.
本文提出了一种基于复合悬臂梁的压电能量采集器（CCBPH）。这种压电能量采集器利用缠绕流体后方的涡激振动来采集风能。具体而言，该结构利用垂直悬挂的圆柱形缠绕流体后方形成的涡激来引起圆柱形缠绕流体的振动，进而间接激发压电元件。CCBPH由固定支撑、悬臂梁、磁体1和磁体2、支撑梁、两个压电单元 - 聚偏氟乙烯（PVDF）、复合悬臂梁以及圆柱形缠绕流体组成。我们研究了影响该结构的参数，并通过结构设计、仿真分析和实验验证了能量采集器的有效性。实验结果表明，CCBPH在风速为18 m/s时可从能量采集器获得最大输出电压。在外部负载电阻为2000 kΩ时实现了最大输出功率。通过比较发现，当两个磁体之间的距离为20 mm且铜的质量比为1:2时，最大输出功率为0.095 mW。
