Abstract:
In this study, we present a new vibration energy harvester that aims to harness the
involuntary hand movements associated with vibration. The device features a special
single-beam design with a piezoelectric component located at the principal point. We used
both experimental and computational methods to analyze the performance of the harvester
in the study. In practical tests, a rather low resonant frequency of 7.5 Hz emerged, which
is consistent with the 8.0373 Hz predicted by the Finite Element Method (FEM) simulation.
Variations in material properties and manufacturing tolerances result in these small
variations. A mass-spring mechanism combined with a cantilever beam concept forms the
basis of the combined design. This arrangement increases the bending moment of the beam,
maximizing the energy conversion efficiency. The results of experimental evaluation in an
open-loop environment were encouraging. At a resonant frequency of 7.5Hz, the device
generated an impressive peak-to-peak voltage of 11.44V. When connected to an ideal load
resistance of 470kΩ, the maximum output power of the combine was 63.89μW. These
results show how our system can be used to harvest energy from low-frequency vibrations,
especially those caused by physical impact. The combine's ability to generate large
amounts of energy with small hand movements indicates potential applications in medical
and wearable technology.
