Abstract In this paper, we present a compressive-mode high-power-density piezoelectric transducer for harvesting vibration energy from spring suspension systems. This device is comprised of a piezoelectric stack and a force amplifier. The piezoelectric stack is mainly composed of multiple PZT-5H piezoelectric units. The force amplifier strengthens the force on the piezoelectric stack to increase the generated energy. We propose an electromechanical conversion relation for the transducer. In this paper, we studied the output capabilities of a prototype though a series of experiments. The experimental results verify the proposed relation and show that the prototype can reach an average output power of 13.63 mW at the resonant frequency of 46.3 Hz under the 0.3 g harmonic excitation with the 1.975 kΩ matched impedance. The prototype has an excellent charge performance with microfarad level capacitors. For instance, the prototype charged a 1000 μF capacitor to saturation (7.5 V) within 18.1 s. The maximum 420 LED diodes were successfully lit by the prototype. Furthermore, the prototype charged a 3 V, 25 mAh lithium battery by 0.017 V in 300 s. This research can be of great significance for piezoelectric energy harvesting and powering wireless sensors in spring suspension systems.

中文翻译：

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利用压缩模式高功率密度压电换能器利用弹簧悬架系统的能量

摘要 在本文中，我们提出了一种压缩模式高功率密度压电换能器，用于从弹簧悬架系统中收集振动能量。该设备由压电堆栈和力放大器组成。压电叠堆主要由多个PZT-5H压电单元组成。力放大器加强压电堆栈上的力以增加产生的能量。我们提出了换能器的机电转换关系。在本文中，我们通过一系列实验研究了原型的输出能力。实验结果验证了所提出的关系，并表明原型​​可以在 46.3 Hz 的谐振频率下在 0.3 g 谐波激励下达到 13.63 mW 的平均输出功率，匹配阻抗为 1.975 kΩ。该原型具有微法级电容器的出色充电性能。例如，原型在 18.1 秒内将 1000 μF 电容器充电至饱和 (7.5 V)。原型机成功点亮了最多 420 个 LED 二极管。此外，原型在 300 秒内为 3 V、25 mAh 锂电池充电 0.017 V。这项研究对于弹簧悬架系统中的压电能量收集和为无线传感器供电具有重要意义。