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Testing of piezoelectric energy harvesters isolated from base vibrations

机译：测试与基础振动隔离的压电能量收集器

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The influence of structural vibrations on piezoelectric energy harvesters' performance is already documented in the literature. Testing of cantilevered type piezoelectric transducers was performed in this work, which confirmed that the voltage output of the piezo-film transducers largely used in studies assuming flow-induced excitation is affected by structural vibrations transported to its base. Aiming to exclude the base vibration effect, two piezoelectric energy harvesting (PEH) test rigs isolated from structural vibrations were constructed and tested at the Laboratory of Fluid Mechanics and Turbomachinery in the Aristotle University of Thessaloniki (LFMT, AUTh). In both cases plastic attachments were mounted on the piezo-films to increase their voltage output range. The first set up created air flow excitation using a low power axial fan (set up A) and the second using a centrifugal fan (set up B). The Reynolds numbers ranged at 5000-110,000. The maximum swirl number was 0.5 in both set ups. Traverse mechanisms were employed to study the effect of the harvesters' distance from the source of excitation on their power output. Both harvesters demonstrated higher power outputs for higher fan speeds. The power output of the harvesters was found to increase with the increase of the voltage root mean square (rms) value. The maximum power harvested was 3.75 mu W and it was observed at the highest fan speed of set up B.
机译：结构振动对压电能量收集器性能的影响已在文献中记录。在这项工作中对悬臂式压电换能器进行了测试，这证实了压电薄膜换能器的电压输出主要用于假设流动引起的激励的研究中，而该压电薄膜换能器受到传递到其基座的结构振动的影响。为了排除基础振动影响，在萨洛尼卡亚里士多德大学流体力学和涡轮机械实验室（LFMT，AUTh）建造了两个与结构振动隔离的压电能量收集（PEH）测试台并进行了测试。在这两种情况下，塑料附件都安装在压电薄膜上以增加其电压输出范围。第一个装置使用低功率轴流风扇（装置A）产生气流激励，第二个装置使用离心风扇（装置B）。雷诺数在5000-110,000之间。在两个装置中，最大涡流数均为0.5。遍历机制被用来研究收割机距离激励源的距离对其功率输出的影响。两台收割机均显示出更高的功率输出，以实现更高的风扇速度。发现收割机的功率输出随电压均方根（rms）值的增加而增加。收获的最大功率为3.75μW，在设置B的最高风扇速度下观察到。

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