Piezoelectric energy harvesters represent a viable and well-proven solution to convert ambient vibrations into useful electric power within a number of modern life applications. Whilst a large amount of studies has focused on improving power output from these devices, relatively little research has been directed to investigate how these devices degrade over time and the effect this has on long-term power generation. This paper, therefore, aims to experimentally investigate how piezoelectric vibration energy harvesters degrade during long-term operation in realistic harvesting conditions. The harvesters tested are unimorph cantilevers based on three of the most commonly used piezoelectric options: polyvinylidene fluoride (PVDF), Macro Fiber Composite (MFC), and Quick Pack (QP). Testing was carried out under single-frequency excitation (10–40 Hz) of 1g amplitude for three million vibration cycles. Our results show that the natural frequency and the optimum load resistance of the h...

中文翻译：

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低频应用压电振动能量采集器的长期功率衰减测试

压电能量收集器代表了一种可行且经过验证的解决方案，可以将环境振动转换为许多现代生活应用中的有用电能。尽管大量研究集中在改善这些设备的功率输出上，但相对较少的研究旨在调查这些设备如何随时间退化以及其对长期发电的影响。因此，本文旨在通过实验研究压电振动能量采集器在实际采集条件下的长期运行过程中如何降解。测试的收割机是基于三种最常用的压电选件的unimorph悬臂：聚偏二氟乙烯（PVDF），宏观纤维复合材料（MFC）和快速包装（QP）。在振幅为1g的单频激励（10–40 Hz）下进行了300万次振动循环的测试。我们的结果表明，发电机组的固有频率和最佳负载电阻是...