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首页> 外文期刊>Smart Materials & Structures >Water droplet impact energy harvesting with P(VDF-TrFE) piezoelectric cantilevers on stainless steel substrates
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Water droplet impact energy harvesting with P(VDF-TrFE) piezoelectric cantilevers on stainless steel substrates

机译：用P（VDF-TRFE）压电悬臂上的水滴冲击能量收获不锈钢基材

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Harvesting energy from ambient environmental sources using piezoelectric transducers has seen a tremendous amount of interest from the scientific community in recent times. The practicality of energy scavenging technology looks set to see continued relevance, with decreasing power demands of electrical systems, such as wireless sensor networks, allowing such technology to progressively act as an energy source to drive and sustain them independently. In light of this, there is a growing opportunity for piezoelectric materials to prolong, or even replace, battery powered sensor systems positioned in remote or difficult to reach areas. It has been demonstrated that falling water droplets of millimetric-scale diameter can impart forces of over a thousand times their resting weight upon surface impact. As such, the potential for utilising piezoelectric transducers to drive sensor systems, by converting the kinetic impact energy of falling water droplets into useful electrical energy, is investigated. The key parameters that affect the efficiency of energy transfer between incident water droplets and piezoelectric cantilever structures made of stainless steel foil coated with the lead-free piezoelectric material P(VDF-TrFE) are investigated. A peak power output of 28 nJ achieved from the impact of a 5.5 mm diameter droplet upon a single energy harvesting transducer illustrated that, for droplets of diameter 3.1-5.5 mm impacting from heights between 0.5 and 2.0 m, it is desirable to utilise piezoelectric transducer beams of bending stiffness in the range of 0.067-0.134 N m(-1) in order to achieve good energy transfer efficiency. Although the active electrode area was constrained in order to maintain consistency between samples, reducing the peak energy output, the achieved results correspond to a 15.9 J m(-3) energy density, representing the significant energy transfer efficiency achievable through appropriate transducer mechanical tailoring to the excitation source.
机译：利用压电传感器收获来自环境环境来源的能量，近年来，科学界的兴趣巨大。能量清除技术的实用性看起来可以看到持续的相关性，随着无线传感器网络等电气系统的电力需求减少，允许这种技术逐步充当能量源以独立驱动和维持它们。鉴于此，压电材料延长或甚至更换的电池供电的传感器系统存在不断增长的机会，这些电池供电的传感器系统定位在远程或难以到达区域。已经证明，毫米级直径的下降水滴可以在表面撞击时施加休息体重超过一千次的力。因此，研究了利用压电换能器来驱动传感器系统的电位，通过将下降水滴的动力学冲击能量转化为有用的电能。研究了影响由无锈钢箔制成的入射水液滴和压电悬臂结构之间的能量传递效率的关键参数进行了涂覆有无铅压电材料P（VDF-TRFE）。从5.5mm直径液滴的冲击实现的峰值功率输出为28 nj，在单个能量收集换能器中，对于从0.5和2.0μm的高度的直径撞击的直径3.1-5.5mm的液滴，希望利用压电换能器弯曲刚度的光束在0.067-0.134 n m（-1）的范围内，以实现良好的能量转移效率。尽管有效电极区域被约束，以便在样品之间保持一致性，降低峰值能量输出，所以实现的结果对应于15.9JM（-3）能量密度，表示通过适当的换能器机械剪裁可实现的显着能量转移效率激发源。

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