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首页> 外文期刊>Mechanical systems and signal processing >Theoretical modeling and experimental validation of the centrifugal softening effect for high-efficiency energy harvesting in ultralow-frequency rotational motion
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Theoretical modeling and experimental validation of the centrifugal softening effect for high-efficiency energy harvesting in ultralow-frequency rotational motion

机译：超级旋转运动中高效能量收集离心软化效应的理论建模与实验验证

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摘要

Recently, the energy harvesting technique has been a promising way to power low-powered wireless sensor nodes. Considering the advantages of rotational motion, various energy harvesters were designed and investigated for rotational energy harvesting. Among these previous studies, it has been demonstrated that the centrifugal force plays an important role in the dynamic response and the generated power of a piezoelectric energy harvester (PEH). As a result, this paper aims to reveal the mechanism of the centrifugal softening effect caused by the centrifugal force, and by which to enhance the energy harvesting performance in ultralow-frequency rotational motion (less than 2 Hz). Therefore, an inverse PEH configuration in rotational motion is proposed in this paper. A compressive theoretical model describing its dynamic response and output voltage is derived according to Lagrange equation and other assumptions. An experimental setup is established to verify the proposed theoretical model and to investigate the influence of the centrifugal softening effect on the output voltage. According to the experimental results, the root-mean-square (RMS) output voltage of the proposed PEH with the centrifugal softening effect reaches 4 V, which is improved over 100% under the rotational speed range of 75-120 rpm (1.2-2 Hz) compared with the forward PEH configuration. Furthermore, such a significant enhancement due to the centrifugal softening effect is theoretically explained via the derived theoretical model. Overall, the centrifugal softening effect is markedly beneficial for energy harvesting in ultralow-frequency rotational motion, and the derived theoretical model has been validated by the experiments to be effective. This study provides the theoretical and experimental guidance for the further research and applications of the centrifugal softening effect.
机译：最近，能量收集技术是电源低功耗的无线传感器节点的有希望的方式。考虑到旋转运动的优点，设计并研究了各种能量收割机以进行旋转能量收集。在这些之前的研究中，已经证明了离心力在压电能量收割机（PEH）的动态响应和产生的功率中起着重要作用。结果，本文旨在揭示由离心力引起的离心软化效应的机制，并通过其中提高超级频率旋转运动中的能量收集性能（小于2 Hz）。因此，本文提出了一种旋转运动中的反向PEH配置。描述其动态响应和输出电压的压缩理论模型根据拉格朗日方程和其他假设导出。建立实验设置以验证所提出的理论模型，并研究离心软化效果对输出电压的影响。根据实验结果，具有离心式软化效果的提出的PEH的根平均方形（RMS）输出电压达到4 V，在75-120rpm的转速范围内提高了100％以上（1.2-2 Hz）与前向PEH配置进行比较。此外，通过衍生的理论模型理论上解释了由于离心式软化效果引起的这种显着增强。总的来说，离心式软化效果显着有利于超级频率旋转运动中的能量收集，并且通过实验验证了导出的理论模型是有效的。本研究为离心式软化效果的进一步研究和应用提供了理论和实验指导。

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