We study the performance of vibrational energy harvesting systems with piezoelectric and magnetic inductive transducers, assuming the power of external disturbance concentrated around a specific frequency. Both linear and nonlinear harvester models are considered. We use circuit theory and equivalent circuits to show that a large improvement in both the harvested energy and the power efficiency is obtained, for linear systems, through a proper reactive modification of the load. For nonlinear systems, we use methods of nonlinear dynamics to derive analytical formulae for the output voltage, the harvested energy and the power efficiency. We show that also for the nonlinear case, the modified load significantly boosts the performance.

假设外部干扰的功率集中在特定频率附近，我们将研究具有压电和磁感应换能器的振动能量收集系统的性能。同时考虑了线性和非线性收割机模型。我们使用电路理论和等效电路来证明，对于线性系统，通过对负载进行适当的无功修改，可以大大提高收获的能量和功率效率。对于非线性系统，我们使用非线性动力学方法来得出输出电压，收获的能量和功率效率的解析公式。我们表明，对于非线性情况，修改后的负载也可以显着提高性能。