Auxetic structure for increased power output of strain vibration energy harvester
Auxetic structure for increased power output of strain vibration energy harvester
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DOI：
10.1016/j.sna.2018.09.019
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发表时间：
2018-10-15
影响因子：
4.6
通讯作者：
Zhu, Meiling
中科院分区：
文献类型：
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作者：
Ferguson, William J. G.;Kuang, Yang;Zhu, Meiling
为了在利用应变能的同时提高功率输出，研制了一种伸缩(负泊松比)压电能量采集器(APEH)。APEH由粘结在伸展衬底上的压电元件组成。伸展衬底将施加的应力和应变集中到压电元件的区域，并在压电元件中引入伸展行为，这两者都增加了电力输出。建立了有限元模型来优化设计和验证功率增加的机理。制造了三种APEH，并对其进行了表征。将它们的性能与两种普通衬底的等效应变能采集器进行了比较。实验结果表明，在峰值频率为10 Hz、峰值频率为2 5 0的正弦应变激励下，APEH产生的电功率最高可达191.1 mW，是平原收割机峰值功率(13.4mW)的14.4倍。当施加应变的幅度和频率不同时，样品之间的功率增益因子是恒定的。模型和实验结果很好地吻合，曾经用模拟的环氧表面的弹性薄层的弹性常数来解释环氧的不完全结合。(C)2018年作者。爱思唯尔出版公司(Elsevier B.V.)
This paper develops an auxetic (negative Poisson's ratio) piezoelectric energy harvester (APEH) to increase the power output when harnessing strain energy. The APEH consists of a piezoelectric element bonded to an auxetic substrate. The auxetic substrate concentrates the applied stress and strain into the region of the piezoelectric element and introduces auxetic behaviour in the piezoelectric element, both of which increase the electric power output. A finite element model was developed to optimise the design and verify the mechanism of the power increase. Three APEHs were manufactured and characterised. Their performance was compared with two equivalent strain energy harvesters with plain substrates. Experimental results show that the APEHs, excited by sinusoidal strains of 250 is peak-to-peak at 10 Hz, are able to produce electric power of up to 191.1 mu W, which is 14.4 times that of the peak power produced by the plain harvesters (13.4 mu W). The power gain factor is constant between samples as the amplitude and frequency of their applied strains are varied. The model and experimental results are in good agreement, once accounting for the imperfect bonding of the epoxy using the spring constant of the Thin Elastic Layers on the modelled epoxy surfaces. (C) 2018 The Authors. Published by Elsevier B.V.