Sound energy harvesting by leveraging a 3D-printed phononic crystal lens
Sound energy harvesting by leveraging a 3D-printed phononic crystal lens
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DOI：
10.1063/5.0030698
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发表时间：
2021-03
影响因子：
4
通讯作者：
A. Allam;K. Sabra;A. Erturk
中科院分区：
文献类型：
--
作者：
A. Allam;K. Sabra;A. Erturk
我们研究利用3D打印的梯度折射率声子晶体透镜的声波的收获。数值和实验表明，在空气中的音频范围内的声波，以提高声音能量收集的概念。一个有限元模型被开发来设计的单位细胞的色散特性，并构造用于波场模拟的3D透镜。数值模拟证实了入射平面波的聚焦，并研究了折射率分布对波传播方向的敏感性。理论预测进行了实验验证，使用扬声器激励下的扫描麦克风设置，并观察到一个非常好的协议之间的实验和数值波场。圆形压电单晶片采集器放置在透镜的焦点位置处，并且其性能的特征在于在不存在和存在透镜的情况下的电阻器扫描，导致利用透镜采集的功率的超过一个数量级的增强。这里提出的3D打印透镜通过聚焦大大增强了声能的强度，产生微瓦级的功率输出，可以应用于无线传感器和其他低功率电子元件。
We investigate the harvesting of sound waves by exploiting a 3D-printed gradient-index phononic crystal lens. The concept is demonstrated numerically and experimentally for focusing audio frequency range acoustic waves in air to enhance sound energy harvesting. A finite-element model is developed to design the unit cell dispersion properties and to construct the 3D lens for wave field simulations. Numerical simulations are presented to confirm the focusing of incident plane waves and to study the sensitivity of the refractive index profile to the direction of wave propagation. The theoretical predictions are validated experimentally using a scanning microphone setup under speaker excitation, and a very good agreement is observed between the experimental and numerical wave fields. A circular piezoelectric unimorph harvester is placed at the focal position of the lens, and its performance is characterized with a resistor sweep in the absence and presence of the lens, resulting in more than an order of magnitude enhancement in the harvested power with the lens. The 3D-printed lens presented here substantially enhances the intensity of sound energy via focusing, yielding micro-Watt level power output, which can find applications for wireless sensors and other low-power electronic components.