Broadband Energy Harvester Using Non-linear Polymer Spring and Electromagnetic/Triboelectric Hybrid Mechanism.
Broadband Energy Harvester Using Non-linear Polymer Spring and Electromagnetic/Triboelectric Hybrid Mechanism.
复制标题
宽带能量收割机使用非线性聚合物弹簧和电磁/扭矩电离混合机制。
DOI：
10.1038/srep41396
复制
发表时间：
2017-01-25
影响因子：
4.6
通讯作者：
Lee C
中科院分区：
文献类型：
--
作者：
Gupta RK;Shi Q;Dhakar L;Wang T;Heng CH;Lee C
多年来，已经设计了几种方法来扩大工作带宽，但其中大多数只能在高加速度下触发。在这项工作中，我们研究了一种宽带能量采集器的基础上结合非线性硬化效应和多模态能量采集，以获得高带宽在宽范围内的加速度（0.1 g-2.0 g）。为了实现宽带行为，使用了表现出多模态能量收集的基于聚合物的弹簧。此外，通过使用机械限位器，引入了非线性刚化效应。在低加速度（<0.5g）下，聚合物弹簧的附近模式频率有助于加宽特性，而检测质量块与机械止动器接合以在较高加速度下通过非线性硬化引入加宽。在此设计中采用电磁机构，以提高其输出在低加速度时，摩擦电输出可以忽略不计。我们的设备即使在0.1 g的低加速度下也能显示40 Hz的带宽，在2 g时可增加到68 Hz。当沿着使用非线性加强与多模态能量收集时，所获得的带宽从23 Hz增加到68 Hz，在1.8 g时增加了295%。此外，我们还证明了作为加速度传感信号测量的摩擦电输出，电压和电流灵敏度分别为4.7 Vg−1和19.7 nAg−1。
Over the years, several approaches have been devised to widen the operating bandwidth, but most of them can only be triggered at high accelerations. In this work, we investigate a broadband energy harvester based on combination of non-linear stiffening effect and multimodal energy harvesting to obtain high bandwidth over wide range of accelerations (0.1 g–2.0 g). In order to achieve broadband behavior, a polymer based spring exhibiting multimodal energy harvesting is used. Besides, non-linear stiffening effect is introduced by using mechanical stoppers. At low accelerations (<0.5 g), the nearby mode frequencies of polymer spring contribute to broadening characteristics, while proof mass engages with mechanical stoppers to introduce broadening by non-linear stiffening at higher accelerations. The electromagnetic mechanism is employed in this design to enhance its output at low accelerations when triboelectric output is negligible. Our device displays bandwidth of 40 Hz even at low acceleration of 0.1 g and it is increased up to 68 Hz at 2 g. When non-linear stiffening is used along with multimodal energy-harvesting, the obtained bandwidth increases from 23 Hz to 68 Hz with percentage increment of 295% at 1.8 g. Further, we have demonstrated the triboelectric output measured as acceleration sensing signals in terms of voltage and current sensitivity of 4.7 Vg−1 and 19.7 nAg−1, respectively.