Abstract This paper proposes a novel hybrid piezo-dielectric (PD) wind energy harvester, to efficiently harvest the vortex-induced vibration (VIV) energy from low-speed wind. The hybrid PD harvester brings together the following two electromechanical transduction mechanisms: piezoelectric ceramic (PZT) sheets and a vibro-impact (VI) dielectric elastomer generator (DEG). The PZT sheets directly transduce the beam’s vibration into electricity, whereas the VI DEG transduces the impacts between the inner ball and the dielectric elastomer membranes resulting from the bluff body’s vibration into electricity. The theoretical model of the hybrid PD harvester subjected to VIV is formulated. Wind tunnel experiments are performed to validate the aerodynamic part of the theoretical model and identify the aerodynamic coefficients. Afterward, based on the theoretical model, the numerical investigation of the hybrid PD harvester is conducted, which uncovers the insights of the conjunction of the PZT and VI DEG for VIV energy harvesting enhancement. It is seen that in the lock-in region of the VIV, where both the PZT and VI DEG can effectively harvest the VIV energy, the VI DEG can generate much higher power. This demonstrates the superiority of the hybrid PD harvester. Parametrical studies show that the smaller mass, higher stiffness and larger diameter of the bluff body are beneficial designs, which broadens the working wind range and enhances the generate power.

中文翻译：

---

一种用于高性能涡激振动能量收集的混合压电介质风能收集器

摘要 本文提出了一种新型混合压电（PD）风能收集器，以有效地从低速风中收集涡激振动（VIV）能量。混合 PD 采集器将以下两种机电转换机制结合在一起：压电陶瓷 (PZT) 片和振动冲击 (VI) 介电弹性体发生器 (DEG)。PZT 片材直接将梁的振动转换为电，而 VI DEG 将内球和介电弹性体膜之间的冲击转换为电，这是由于钝体的振动引起的。建立了混合PD采集器的VIV理论模型。进行风洞实验以验证理论模型的空气动力部分并确定空气动力系数。之后，基于理论模型，对混合PD采集器进行了数值研究，揭示了PZT和VI DEG结合对VIV能量采集增强的见解。可以看出，在VIV的锁定区域，PZT和VI DEG都可以有效地收集VIV能量，VI DEG可以产生更高的功率。这证明了混合PD收割机的优越性。参数研究表明，钝体较小的质量、较高的刚度和较大的直径是有益的设计，拓宽了工作风范围，提高了发电功率。可以看出，在VIV的锁定区域，PZT和VI DEG都可以有效地收集VIV能量，VI DEG可以产生更高的功率。这证明了混合PD收割机的优越性。参数研究表明，钝体较小的质量、较高的刚度和较大的直径是有益的设计，拓宽了工作风范围，提高了发电功率。可以看出，在VIV的锁定区域，PZT和VI DEG都可以有效地收集VIV能量，VI DEG可以产生更高的功率。这证明了混合PD收割机的优越性。参数研究表明，钝体较小的质量、较高的刚度和较大的直径是有益的设计，拓宽了工作风范围，提高了发电功率。