Research on dynamic anti-resonance energy harvester

Abstract

In this paper, an energy harvester based on a lever-type vibration isolator (LVI-EH) for simultaneous low-frequency vibration isolation and energy harvesting is proposed, theoretically investigated, and experimentally verified. The device has a lever structure, mounting springs, and piezoelectric buckled beams. The piezoelectric buckled beams and the lever mechanism play complementary roles: both reduce the isolation frequency, while the lever mechanism amplifies the negative stiffness effect of the piezoelectric buckled beams, enabling a lower isolation frequency. Additionally, utilizing the larger relative displacement at the lever mechanism’s end, the piezoelectric thin films create more strain and stress than those directly mounted on the vibration-isolated object, producing more electrical output. The buckled beam structure with pre-determined deformation ensures that even at the anti-resonance point, larger strains and stresses are still generated, maintaining higher energy output. Through numerical analysis and experiments, we investigated various parameters. Results indicate the proposed LVI-EH device outperforms traditional devices in low-frequency vibration isolation and energy harvesting, effectively tackling issues like low efficiency and narrow working bands.