Abstract
Harvesting energy from ambient sources has been a recent topic of interest. A typical linear harvester is effective only near resonance, limiting its frequency bandwidth. In order to increase the efficiency and bandwidth of harvesters, various strategies have been proposed. Using multiple harvesters in a single device can harvest enough power over wider frequency band. In the present work, the effect of torsional coupling of the harvesters for low frequency vibration energy harvesting is investigated. Two pendulums with electromagnetic induction as the energy conversion mechanism is proposed. The performance of the device is studied theoretically and numerically. Cubic polynomials are used to model the pendulum nonlinearity. Fundamental harmonic oscillation are assumed to obtain the analytical solution. The effect of torsional coupling and pendulum length on the power harvested are reported.
Highlights
The concept of harvesting energy from ambient sources has been the focus of the energy harvesting community
Energy harvesting converts this ambient energy into electrical energy, which can be used for low-power devices
It can be seen that both pendulums can harvest the peak voltage at different frequencies due to the difference in the pendulum lengths
Summary
The concept of harvesting energy from ambient sources has been the focus of the energy harvesting community. Ambient energy sources exist in various forms such as solar, wind, tidal, mechanical vibrations and many more [1, 2] Energy harvesting converts this ambient energy into electrical energy, which can be used for low-power devices. While a close eigenmode provides a broadband application with lower power output, a large frequency gap between the modes makes these harvesters ineffective for harvesting power over a continuous frequency band [11] Mechanical coupling of these multiple harvesters enhances both the magnitude and bandwidth of power [12]. Two torsionally coupled nonlinear pendulums for broadband electromagnetic energy harvesting is studied. The pendulum lengths are mistuned to obtain increased bandwidth Effect of coupling these two mistuned harvesters is analyzed using the HBM and a numerical study.
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