Wang Yuansheng, Zhou Zhiyong, Liu Qi, Qin Weiyang, Zhu Pei
Department of Engineering Mechanics, Northwestern Polytechnical University, Xi'an 710072, China.
School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, China.
Materials (Basel). 2020 Mar 19;13(6):1389. doi: 10.3390/ma13061389.
To harvest the energy of variable-speed wind, we proposed a dynamic multi-stable configuration composed of a piezoelectric beam and a rectangular plate. At low wind speeds, the system exhibits bi-stability, whereas, at high wind speeds, the system exhibits a dynamic tri-stability, which is beneficial for harvesting variable-speed wind energy. The theoretical analysis was carried out. For validation, the prototype was fabricated, and a piezoelectric material was bonded to the beam. The corresponding experiment was conducted, with the wind speed increasing from 1.5 to 7.5 m/s. The experiment results prove that the proposed harvester could generate a large output over the speed range. The dynamic stability is helpful to maintain snap-through motion for variable-speed wind. In particular, the snap-through motion could reach coherence resonance in a range of wind speed. Thus, the system could keep large output in the environment of variable-speed wind.
为了获取变速风能，我们提出了一种由压电梁和矩形板组成的动态多稳态结构。在低风速下，系统呈现双稳态，而在高风速下，系统呈现动态三稳态，这有利于收集变速风能。进行了理论分析。为了验证，制作了原型，并将压电材料粘结到梁上。进行了相应的实验，风速从1.5米/秒增加到7.5米/秒。实验结果证明，所提出的能量收集器在该速度范围内能够产生较大的输出。动态稳定性有助于维持变速风的跳跃运动。特别是，跳跃运动在一定风速范围内能够达到相干共振。因此，该系统在变速风环境中能够保持较大的输出。
