Abstract
Inspired by vortex induced vibration energy harvesting development as a new source of renewable energy, a T-shaped design vibration energy harvester is introduced with the aim of enhancing its performance through vortex induced vibration at near resonance conditions. The T-shaped structural model designed consists of a fixed boundary aluminum bluff splitter body coupled with a cantilever piezoelectric vibration energy harvesters (PVEH) plate model which is a piezoelectric bimorph plate made of a brass plate sandwiched between 2 lead zirconate titanate (PZT) plates. A 3-dimensional Fluid-Structure Interaction simulation analysis is carried out with Reynolds Stress Turbulence Model under wind speed of 7, 10, 12, 14, 16, 18, 19, 20, 22.5, and 25 m/s. The results showed that with 19 m/s wind speed, the model generates 75.758 Hz of vortex frequency near to the structural model’s natural frequency of 76.9 Hz. Resonance lock-in therefore occurred, generating a maximum displacement amplitude of 2.09 mm or a 49.76% increment relatively in vibrational amplitude. Under the effect of resonance at the PVEH plate’s fundamental natural frequency, it is able to generate the largest normalized power of 13.44 mW/cm3g2.
Highlights
In the past, vibration energy harvesting (VEH) had been utilized to power small-scale devices such as sensors and instruments
In this research relating to flow induced vibration, piezoelectric harvesting is the go-to method of VEH and this investigation is aimed at improving performance through the amplification of force while fine tuning the vortex frequency towards the natural frequency of the model
The piezoelectric Vortex induced vibration (VIV) harvester from this research implements a T-shaped design with a fixed bluff splitter body attached to a cantilever piezoelectric vibration energy harvesters (PVEH) plate, in order to increase the aspect ratio for better flow separation and to further improve the quality of vortex generated
Summary
Vibration energy harvesting (VEH) had been utilized to power small-scale devices such as sensors and instruments. Many studies have been conducted throughout the years to improve the efficiency and capacity of current vibration harvesting systems, the ultimate goal of which has been to the remove the power source or battery required for small usage. Transducers are used to convert ambient vibration energy sources into electrical energy. The most common transducers are electrostatic, electromagnetic and piezoelectric. Electromagnetic transducers use electromotive force that is created.
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