Vibration energy harvesting enhancement exploiting magnetically coupled bistable and linear harvesters
Vibration energy harvesting enhancement exploiting magnetically coupled bistable and linear harvesters
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DOI：
10.1088/1361-665x/ab809a
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发表时间：
2020-06-01
影响因子：
4.1
通讯作者：
Wang, K. W.
中科院分区：
文献类型：
--
作者：
Kim, Jinki;Dorin, Patrick;Wang, K. W.
许多常见的环境振动源具有低而宽的频谱。为了利用这样的激励，能量收集架构利用非线性，特别是双稳态，已被广泛探索作为一个有前途的能源，自供电的小型电子设备。对于这样的装置，与线性对应物相比，它们的稳定平衡之间的能量井间振荡可以在更宽的带宽上提供增强的功率收集能力。然而，这些非线性架构的限制之一是，对于不足以克服势能势垒的低激发水平，可能不容易激活井间振荡机制，从而导致低振幅井内响应，这提供了差的能量收集性能。本研究探讨一种多自由度（MDOF）的振动能量收集系统，利用磁耦合的直线和直线收割机。它提出了对利用被动机制的新颖的深入见解，该被动机制不仅通过被动地和自适应地降低势能势垒水平来促进对于比传统的能量采集器可能需要的相对低的激发振幅和频率的能量井间响应，而且还有效地利用了磁耦合直线电机引入的重新分配的动态能量和丰富的多自由度动态特性，收割机结果发现，除了具有自适应势的能量采集器的增强的功率采集性能之外，从重新分配的能量和由被动机制引入的高次谐波谐振捕获的功率进一步提高了能量采集性能，特别是在较低的频率范围。分析、数值和实验研究表明，战略性地将线性采集器磁耦合到传统的能量采集器提供了一种有效且易于实现的手段，用于增强宽带能量采集性能。
Many common environmental vibration sources exhibit low and broad frequency spectra. In order to exploit such excitations, energy harvesting architectures utilizing nonlinearity, especially bistability, have been extensively explored as a promising energy source for self-powered small-scale electric devices. For such devices, the energetic interwell oscillations between their stable equilibria can provide enhanced power harvesting capability over a wider bandwidth compared to the linear counterpart. Yet, one of the limitations of these nonlinear architectures is that the interwell oscillation regime may not be readily activated for low excitation level that is not sufficient to overcome the potential energy barrier, thus resulting in low amplitude intrawell response, which provides poor energy harvesting performance. This research investigates a multi-degree of freedom (MDOF) vibration energy harvesting system that leverages magnetically coupled bistable and linear harvesters. It presents novel in-depth insights into capitalizing on a passive mechanism that not only facilitates the energetic interwell response for relatively low excitation amplitudes and frequencies than that may be required for conventional bistable harvester by passively and adaptively lowering the potential energy barrier level, but also effectively exploits the redistributed dynamic energy and the rich MDOF dynamic characteristics introduced by the magnetically coupled linear harvester. It is found that in addition to the enhanced power harvesting performance of bistable harvester with adaptive potential, the power captured from the redistributed energy and the higher harmonic resonances introduced by the passive mechanism further increase the energy harvesting performance especially at the lower frequency range. Analytical, numerical, and experimental investigations reveal that strategically incorporating a linear harvester magnetically coupled to a conventional bistable harvester provides an effective and easy to implement means for enhancing broadband energy harvesting performance.