Multiple electrically tunable parametric resonances in a capacitively coupled electromechanical resonator for broadband energy harvesting
Multiple electrically tunable parametric resonances in a capacitively coupled electromechanical resonator for broadband energy harvesting
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DOI：
10.1088/1361-665x/abea02
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发表时间：
2021-04
影响因子：
4.1
通讯作者：
S. Surappa;T. Erdogan;F. Degertekin
中科院分区：
文献类型：
--
作者：
S. Surappa;T. Erdogan;F. Degertekin
参数激励作为非线性振动能量采集系统中的一种机械预放大方法得到了广泛的应用。然而，尽管它们的优点，目前大多数PE系统是有限的，在一个狭窄的频带内的主要不稳定舌退化参数操作。在本文中，我们模拟和实验证明了参数驱动的电容机电谐振器具有多个电自由度。多个模式允许若干频带，其中除了简并谐振之外，电谐振器还被驱动到非简并（组合）参数谐振（PR）中，从而使得能够在更宽的频率范围上操作，同时保持相同的机械足迹。这些频带和PR阈值可通过简单地改变电路参数来调谐，并且PR可以在存在高机械阻尼的情况下实现，使得该方法比纯机械方法更适应。实验结果扩展模拟表明，适当选择的操作参数，可以使合并的不稳定舌产生的宽带区域的PR弹性波能量收集，从而获得上级性能相比，相当于单自由度PE能量采集器。
Parametric excitation (PE) has widely been employed as a method of mechanical pre-amplification in nonlinear vibration energy harvesting systems. However, despite their advantages, most current PE systems are limited to degenerate parametric operation within a narrow frequency band around the primary instability tongue. In this paper, we simulate and experimentally demonstrate a parametrically driven capacitive electromechanical resonator having multiple electrical degrees of freedom. Multiple modes allow for several frequency bands in which the electrical resonator is driven into nondegenerate (combination) parametric resonance (PR) in addition to degenerate resonance, thereby enabling operation over a broader range of frequencies while maintaining the same mechanical footprint. These frequency bands and PR thresholds are tunable by simply changing the electrical circuit parameters and PR can be achieved in the presence of high mechanical damping making the method more adaptable than purely mechanical approaches. Experimental results are extended by simulations indicating that proper selection of operating parameters can enable the merging of instability tongues to produce a broadband region of PR for elastic wave energy harvesting thereby obtaining superior performance when compared to an equivalent single degree of freedom PE energy harvester.