A hybrid piezo-dielectric wind energy harvester for high-performance vortex-induced vibration energy harvesting

Zhihui Lai, Shuaibo Wang, Likuan Zhu, Guoqing Zhang, Junlei Wang, Kai Yang, Daniil Yurchenko

Research output: Contribution to journalArticle

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.

Original languageEnglish
Article number107212
JournalMechanical Systems and Signal Processing
Volume150
Early online date17 Sep 2020
DOIs
Publication statusE-pub ahead of print - 17 Sep 2020

Keywords

  • Dielectric elastomer generator
  • Energy harvesting
  • Piezoelectric
  • Vibro-impact
  • Vortex-induced vibration

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Signal Processing
  • Civil and Structural Engineering
  • Aerospace Engineering
  • Mechanical Engineering
  • Computer Science Applications

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