Abstract
This research proposes an energy harvesting system that collects the downward airflow from a helicopter or a multi-axis unmanned rotary-wing aircraft and uses this wind force to drive the magnet to rotate, generating repulsive force, which causes the double elastic steel system to slap each other and vibrate periodically in order to generate more electricity than the traditional energy harvesting system. The design concept of the vibration mechanism in this study is to allow the elastic steel carrying the magnet to slap another elastic steel carrying the piezoelectric patch to form a set of double elastic steel vibration energy harvesting (DES VEH) systems. The theoretical DES VEH mechanism of this research is composed of a pair of cantilever beams, with magnets attached to the free end of one beam, and PZT attached to the other beam. This study analyzes the single beam system first. The MOMS method is applied to analyze the frequency response of this nonlinear system theoretically, then combines the piezoelectric patch and the magneto-electric coupling device with this nonlinear elastic beam to analyze the benefits of the system’s converted electrical energy. In the theoretical study of the DES VEH system, the slapping force between the two elastic beams was considered as a concentrated load on each of the beams. Furthermore, both SES and DES VEH systems are studied and correlated. Finally, the experimental data and theoretical results are compared to verify the feasibility and correctness of the theory. It is proven that this DES VEH system can not only obtain the electric energy from the traditional SES VEH system but also obtain the extra electric energy of the steel vibration subjected to the slapping force, which generates optimal power to the greatest extent.
Highlights
The development of green energy technology has always been an important research topic, and vibration often occurs in life, the research on vibration energy harvester (VEH) that uses vibration to generate electricity is a very popular field
This research is based on the main structure of a fixed-free nonlinear elastic beam with a tip mass
The frequency response and amplitude are analyzed by the method of multiple scales (MOMS) method and fixed points plots
Summary
The development of green energy technology has always been an important research topic, and vibration often occurs in life, the research on vibration energy harvester (VEH) that uses vibration to generate electricity is a very popular field. Roundy and Wright [3] pointed out that the model of the VEH system based on the principle of piezoelectricity is increasing, and most of them have been verified in practice. This technology is not limited to theoretical predictions. In the review work of Iqbal et al [4], they concluded that due to the large amount of vibration-based energy available in the environment, the VEH has been identified as the energy harvester with the highest potential. We can see the rise of mechanical vibration into green energy in the field of energy
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