宽频压电振动能量采集器的实验研究
Experimental Researches for Broadband Piezoelectric Vibration Energy Harvester

为改善线性单频谐振式压电振动能量采集器的输出性能，研制了双自由度宽频压电振动能量采集器样机模型，搭建了样机实验测试平台，研究了系统刚度比和负载电阻等参数对能量采集器输出性能的影响。通过调节系统刚度比，不仅可以拓宽压电振动能量采集器的工作率带，还提高了压电振动能量采集器的输出电压和输出功率。结果表明：在基础振动加速度为40 m/s2和负载电阻为471 kΩ条件下，双自由度宽频压电能量采集器的工作频带是单频系统的7倍，最大输出功率是单频系统的4.5倍。
To improve the output performances of the linear resonant piezoelectric vibration energy harvester (PVEH), a two-degree of freedom broadband piezoelectric vibration energy harvester (BPVEH) is developed. The experimental setup used to test the BPVEH performances is established. The effects of the stiffness ratio and the load resistor on the output performances of the BPVEH are studied by experiments. The results have shown that BPVEH can not only broaden the operational frequency bandwidth, but also improve the output voltage and the output power by adjusting the stiffness ratio. The bandwidth of the BPVEH is 7 times of the PVEH, and the maximum output power is 4.5 times of the PVEH when the base acceleration is 40 m/s2 and the load resistor is 471 kΩ.