Method for controlling vibration by exploiting piecewise-linear nonlinearity in energy harvesters
Method for controlling vibration by exploiting piecewise-linear nonlinearity in energy harvesters
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DOI：
10.1098/rspa.2019.0491
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发表时间：
2020-01
期刊：
影响因子：
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通讯作者：
Meng-Hsuan Tien;Kiran D’Souza
中科院分区：
文献类型：
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作者：
Meng-Hsuan Tien;Kiran D’Souza
振动能量正在成为能量产生的重要替代解决方案。最近，已经进行了大量的研究，关于如何从振动源收集能量，从海浪到人体运动到微系统。本文提出了一种分段线性（PWL）非线性振动采集器的理论模型，并对其进行了数值研究。这种新技术通过控制PWL振荡器中的差距大小使得它能够适应激励的变化来实现能量采集器中的自动频率可调谐性。为了优化系统的性能，本文提出了一种结合响应预测、信号测量和间隙调节机制的控制方法。这种新的能量采集器不仅克服了传统线性能量采集器只能在窄频率范围内提供最大发电效率的限制，而且还改善了当前非线性能量采集器的性能，这些非线性能量采集器在谐振时不如线性能量采集器有效。该系统被证明在几个案例研究，以说明其有效性的一些不同的激励。
Vibration energy is becoming a significant alternative solution for energy generation. Recently, a great deal of research has been conducted on how to harvest energy from vibration sources ranging from ocean waves to human motion to microsystems. In this paper, a theoretical model of a piecewise-linear (PWL) nonlinear vibration harvester that has potential applications in variety of fields is proposed and numerically investigated. This new technique enables automatic frequency tunability in the energy harvester by controlling the gap size in the PWL oscillator so that it is able to adapt to changes in excitations. To optimize the performance of the proposed system, a control method combining the response prediction, signal measurement and gap adjustment mechanism is proposed in this paper. This new energy harvester not only overcomes the limitation of traditional linear energy harvesters that can only provide the maximum power generation efficiency over a narrow frequency range but also improves the performance of current nonlinear energy harvesters that are not as efficient as linear energy harvesters at resonance. The proposed system is demonstrated in several case studies to illustrate its effectiveness for a number of different excitations.