Study of a Piezoelectric Energy Harvesting Collaborative Strategy Based on the Synergy of Multifrequency Technique and Magnetic Nonlinear Technique

Abstract

For the purpose of improving the operating bandwidth and output power of piezoelectric vibration energy harvesters (PVEHs) in low‐frequency environment, a novel energy harvesting collaborative strategy based on the synergy of multifrequency technique and magnetic nonlinear technique is proposed. In order to reveal the working mechanism of the proposed strategy and determine the influence law of the key parameters on the output performances of system, theoretical modeling, simulation analysis, and experiments have been carried out. This study proves the feasibility of the two techniques cooperating and complementing each other on the mechanism level, and optimizes the ability of the inner and outer beams to capture energy under the action of the pair of magnets on the structural level. After the optimization of key parameters, the output performance of the proposed PVEH utilizing multifrequency and magnetic structure is higher than the counterpart only based on multifrequency cantilever structure. In an optimal configuration, the fabricated prototype can finally obtain a maximum power of 2.68 mW and a bandwidth of 1.39 Hz under 0.2 g acceleration with 0.03 MΩ load resistance. The proposed piezoelectric energy harvesting collaborative strategy can improve the output performance of piezoelectric vibration energy in practical vibration application environments.