Influences of Environmental Motion Modes on the Efficiency of Ultrathin Flexible Piezoelectric Energy Harvesters
Influences of Environmental Motion Modes on the Efficiency of Ultrathin Flexible Piezoelectric Energy Harvesters
复制标题
环境运动模式对超薄柔性压电能量采集器效率的影响
DOI：
10.1007/s10338-019-00085-8
复制
发表时间：
2019-10-01
影响因子：
2.2
通讯作者：
Chen，Yisheng
中科院分区：
文献类型：
--
作者：
Lue，Chaofeng;Zhang，Yangyang;Chen，Yisheng
近年来，利用无电池电子设备的柔性压电能量采集器（PEHs）从环境振动源采集能量受到关注。然而，激励模式在环境中和人体运动比以往的理论分析中所采用的理想谐波模式更复杂，它们对PEHs的效率的影响很少受到关注。在这项研究中，这些环境激励模式分为三种类型，即，三角波、正弦波和方波模式，具有不同的占空比。我们从理论上推导了柔性多环芳烃在这些激发模式下的输出功率，并建立了一个简单的标度律，其中归一化输出功率仅取决于两个组合的归一化参数，本征系统参数和激励模式。结果表明，在相同的激励振幅、激励频率、电参数、几何参数和材料参数下，不同占空比的激励模式下，PEHs的输出功率变化较大。本文的研究有助于系统地了解激励方式对柔性PEHs输出功率的影响，促进从复杂的环境和人体运动中获取能量的实现。
Harvesting energy from ambient vibration sources with ultrathin flexible piezoelectric energy harvesters (PEHs) for battery-free electronics has received attention in recent years. However, the excitation modes in the environment and human body motion are more complicated than the ideal harmonic modes employed in previous theoretical analyses, and their influence on the efficiency of PEHs has received little attention. In this study, these environmental excitation modes are classified into three types, i.e., the triangular, sinusoidal, and square wave modes, with varied duty ratios. We derived theoretically the output power of flexible PEHs under these excitation modes and establish a simple scaling law, in which the normalized output power depends only on two combined normalized parameters, i.e., the intrinsic system parameter and the excitation mode. Results reveal that the output power of PEHs changes dramatically for different excitation modes with varied duty ratios even when all the other parameters including excitation amplitude, excitation frequency, electrical parameter, and geometrical and material parameters of the PEHs are identical. This paper may provide a systematic understanding in the effect of excitation modes on the output power of flexible PEHs and promote the realization of energy harvesting from the complex environmental and human body motions.