Abstract
This paper proposes a novel and efficient energy harvester (EH) system, for capturing simultaneously flutter and vortex-induced vibration. There exists a coupling effect between flexible spring energy harvester (FSEH) and cantilever beam energy harvester (CBEH) in aerodynamic response and output characteristic. Many prototypes of the harvester were manufactured to explore the coupling effect in a wind tunnel. The experimental results demonstrate that FSEH is mainly subjected to flutter-induced vibration and CBEH undergoes vortex-induced vibration. Disturbance of FSEH first takes place, a limited oscillation cycle then occurs, and chaos ultimately happens as airflow velocity increase. Root mean square voltages are more than 11 V for FSEH at beyond 10.52 m/s, which shows the better output performance over the existing harvesters. Vibration response and output voltage of various harvesters are mutually enhanced with each other. An enhancing ratio for FSEH-130-25 is up to 69.6% over FSEH-130-0, while the enhancing ratio for CBEH-130-30 is 198.3% compared to CBEH-0-30. Field application testing manifests that discharging time to power the pedometer is almost twice as long as the charging one for FSEH-130-25 at 14.48 m/s. The current research offers a suggestive guidance for promoting future practical application in micro airfoil aircrafts.
Highlights
A vibration-based energy harvester can convert directly vibration energy into electricity via piezoelectric transduction, which owns the enormous advantages of replacing or recharging battery for the sake of sustainably driving low-power monitoring sensor or wireless transmitter usually placed at hard-to-access location for their entire operational life [1,2,3,4,5,6]
When the bluff body is attached to the cantilever beam, which results in improving the vibration response of flexible spring energy harvester (FSEH), while it could cause the unstable vibration leads intensifying the vibration of FSEH, increases the overall weight of at the to higher airflow velocity, as observed in which the harvesting system
This paper presents a novel piezoelectric energy harvester system for concurrent flutter-induced vibration (FIV) and vortex-induced vibration (VIV), which explores mainly the coupling effect between FSEH and cantilever beam energy harvester (CBEH)
Summary
A vibration-based energy harvester can convert directly vibration energy into electricity via piezoelectric transduction, which owns the enormous advantages of replacing or recharging battery for the sake of sustainably driving low-power monitoring sensor or wireless transmitter usually placed at hard-to-access location for their entire operational life [1,2,3,4,5,6]. Bibo et al [57] proposed a single vibratory energy harvester integrated with an airfoil to concurrently harness energy from ambient vibration and wind It can be known from the above literature that the flutter-induced piezoelectric energy harvesters with the cantilever beam attached to the fixed airfoil were proposed to investigate the output performance. This paper proposes a novel piezoelectric energy harvester system with the cantilever beam attached to the trailing edge of the mobile airfoil, including FSEH and CBEH, to harvest concurrent FIV and VIV. The VIV generated by the cylindrical biffy body could be acted on the airfoil, and affect largely the aeroelastic response of FSEH To this end, this paper explores the coupling effect and enhances the output performance of the harvester system.
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