Preliminary Experimental Validation of Stabilizing Non-linear Oscillations Based on the Optimizing-Centrifugal-Effect for Rotational Energy Harvesting

Abstract

Non-linear bistable energy harvesters (BEH) can effectively improve amplitude of output voltages by stabilizing high-energy orbital oscillations of a tip magnet. Considering the centrifugal effects due to rotations shows that BEH can further maintain higher performances with wider bandwidths. However, BEH is sensitive to the centrifugal distance and can only perform well over a narrow range. With the purpose of exploring the advantages of setting the centrifugal distance for the tip magnet in simulations and experiments, it is necessary to calculate an optimal centrifugal distance under different parameters. In theory, the relationship of non-linear frequency-matching between the jump-down frequency of the monostable state and the rotating frequency of the external circumstances can be utilized to solve for the optimal centrifugal distance under different parameters. The experimental results validated that the BEH performance and bandwidth are sensitive to variations in the centrifugal distance, and responses under an optimal distance are improved significantly, especially in terms of its effective operational bandwidth and energy harvesting capacity.