Design and test on the nonlinear piezoelectric-electromagnetic hybrid energy harvesting structure

At present, the study of environmental vibration energy harvesting mainly concentrated in the hybrid energy harvester. In this paper, a nonlinear PE-EM hybrid harvesting structure is designed, and the nonlinear magnetic force is introduced in the hybrid structure to change the resonant frequency and the bandwidth of the harvester. The theoretical model of nonlinear hybrid harvester system is established. The experimental results of the nonlinear hybrid harvester show that the direction and size of the magnetic force have great influence on the performance of the nonlinear hybrid harvester and also show that the bandwidth of harvester is improved and the working frequency of harvester can be adjusted with the appearance of nonlinear magnetic force. And the designed nonlinear hybrid harvester has good environmental adaptability because the bandwidth increases.