1.State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics, Nanjing 210016;
2.Jiangsu Key Laboratory of 3D Printing Equipment and Manufacturing, Nanjing Normal University, Nanjing 210042
Abstract：In order to establish a unified performance comparison standard and obtain the maximum output power and the corresponding optimal loads for a piezoelectric–electromagnetic hybrid vibration energy harvester, a generalized dimensionless parameter model is introduced to address this problem. The expression of the theoretical normalized output power is derived, and the maximum value and the optimal loads are obtained based on genetic algorithm; the relations between the dimensionless parameters and the performance of the harvester are analyzed by numerical simulations, and the feasibility of the model and genetic algorithm for this topic are confirmed by the experiment. The results show: (1) reducing coil resistance can improve the performance; (2) improving mechanical quality factor can increase the frequency-selective; (3) the performance is co-determined by piezoelectric and electromagnetic when the two effects are weak coupling, and the best performance is obtained at their matching point; (4) the performance is almost determined by electromagnetic when it is strong coupling, and it increases to the ultimate performance with the increase of electromagnetic effect; (5) the optimal load range is increased by using the piezoelectric–electromagnetic dual-coupling mechanisms.
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