Dynamically synergistic transition mechanism and modified nonlinear magnetic force modeling for multistable rotation energy harvester

Multistable energy harvesters with magnetic interaction have received increasing attention. However, the synergistic transition mechanism of the different oscillation states for rotation harvesters remains uninvestigated, and there is lack of precise magnetic force model for inves-tigating the effect of the external magnetic force on dynamic characteristics and harvesting performance. This study proposes a synergistic transition and regulation mechanism for rotation energy harvesting and a modified model of the magnetic force is derived by taking the relative displacement and rotational angle into consideration. The transition mechanism of different oscillation states for the rotation system is studied under the guidance of static bifurcation, po-tential diagram, and dynamic behaviors, respectively. Based on the extended Hamilton's prin-ciple, the theoretical model is established and the complexity dynamic characteristics are simulated. A prototype of multistable energy harvesters with magnetic interaction was fabricated and the effectiveness of the theoretical model was validated by experiments. The experimental results exhibit good agreement with the numerical results. The proposed harvester can harvest energy effectively in a wide rotation speed range of 280-500 rpm, and the output voltage and power can reach 6.4 V and 4 mW.

Automated summary

This study investigates the synergistic transition mechanism and magnetic force model of rotation energy harvesters. A new transition and regulation mechanism is proposed, and a modified magnetic force model is established. The transition mechanism of different oscillation states in the rotation system is explored using static bifurcation, potential diagram, and dynamic behaviors. The effectiveness of the theoretical model is validated through experiments, showing good agreement with numerical results. The proposed harvester can effectively harvest energy in a wide rotation speed range of 280-500 rpm, with an output voltage and power of 6.4 V and 4 mW.