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 was introduced to address this problem.The expression of the theoretical normalized output power was derived,and the maximum value and the optimal loads were obtained based on a genetic algorithm;the relationships between the dimensionless parameters and the performance of the harvester were analyzed by numerical simulations,and the feasibility of the model and genetic algorithm for this topic were verified by an experiment.The results show:① reducing coil resistance can improve the performance;②improving mechanical quality factor can increase the frequency selectivity;③ the performance is co-determined by piezoelectric and electromagnetic factors when the two effects are weak coupling,and the best performance is obtained at their matching point;④ the performance is almost determined by the electromagnetic factor when it is strong coupling,and it increases to the ultimate performance with the electromagnetic effect;⑤ the optimal load range is increased by using the piezoelectric-electromagnetic dual-coupling mechanisms.%针对压电-电磁复合动能采集器的物理参数模型难以提供统一的性能比较标准,以及最大输出功率及最优负载直接求解困难等问题.通过引入无量纲参数建立了采集器的无量纲参数模型,理论推导了归一化输出功率,并采用遗传算法求解了最大输出功率及最优负载;数值分析了无量纲参数对采集器性能的影响,并实验验证了模型和遗传算法求解的正确性.结果表明:①减小线圈负载可提升性能;②增大机械品质因子将提高频率选择能力;③当压电和电磁均为弱耦合作用时,性能受二者共同影响,且在二者匹配时获得最优;④当电磁为强耦合作用时,性能基本只受电磁端影响,且随其增强而不断趋近最优;⑤压电-电磁双耦合机制可增大采集器的最优负载范围.
展开▼
