Impulsive energy conversion with magnetically coupled nonlinear energy harvesting systems
Impulsive energy conversion with magnetically coupled nonlinear energy harvesting systems
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DOI：
10.1177/1045389x18770860
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发表时间：
2018-04
影响因子：
2.7
通讯作者：
Quanqi Dai;I. Park;R. Harne
中科院分区：
文献类型：
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作者：
Quanqi Dai;I. Park;R. Harne
由于非接触、非线性力可以在采集系统元件之间利用，因此磁体在振动能量采集方面受到广泛关注。然而，在受到脉冲激励的非线性能量收集系统之间集成多方向耦合的机会尚未被仔细审查，尽管这种激励广泛流行。为了表征这些潜力，本研究探讨了能量收集系统的磁感应非线性和耦合效应下的脉冲激励。一个系统模型，制定和验证实验的努力，通过模拟重建系统的静态和动态特性。然后，利用该模型来仔细检查系统在受到脉冲条件时的动态响应。这项研究揭示了明确的脉冲强度的依赖性和影响的不对称性的总电能捕获和能量转换效率，定制的磁力耦合。不对称性被发现，以促进更大的脉冲到电能的转换相比，对称的对应系统和基准的非线性能量采集器。初始条件的作用决定了非对称能量采集系统中存储的能量在非线性脉冲响应过程中如何释放。这些结果提供了机会和挑战的见解，将磁耦合效应在非线性能量收集系统受到脉冲。
Magnets have received broad attention for vibration energy harvesting due to noncontact, nonlinear forces that may be leveraged among harvesting system elements. Yet, opportunities to integrate multi-directional coupling among a nonlinear energy harvesting system subjected to impulsive excitations have not been scrutinized, despite widespread prevalence of such excitations. To characterize these potentials, this research investigates an energy harvesting system with magnetically induced nonlinearities and coupling effects under impulsive excitations. A system model is formulated and validated with experimental efforts to reconstruct static and dynamic properties of the system via simulations. Then, the model is harnessed to scrutinize dynamic response of the system when subjected to impulse conditions. This research reveals the clear impulse strength dependence and influence of asymmetries on total electrical energy capture and energy conversion efficiency that are tailored by magnetic force coupling. Asymmetry is found to promote greater impulse-to-electrical energy conversion when compared to the symmetric counterpart system and a benchmark nonlinear energy harvester. The roles of initial conditions exemplify how stored energy in an asymmetric energy harvesting system may be released during nonlinear impulsive response. These results provide insights about opportunities and challenges to incorporate magnetic coupling effects in nonlinear energy harvesting systems subjected to impulses.