Efficient Energy Harvesting Using Piezoelectric Compliant Mechanisms: Theory and Experiment
Efficient Energy Harvesting Using Piezoelectric Compliant Mechanisms: Theory and Experiment
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DOI：
10.1115/1.4032178
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发表时间：
2016-04-01
影响因子：
1.7
通讯作者：
Trolier-McKinstry, Susan
中科院分区：
文献类型：
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作者：
Ma, Xiaokun;Wilson, Andrew;Trolier-McKinstry, Susan
压电能量采集器通常在人类运动的低频率、低振幅和间歇性激励环境中表现不佳。在本文中，压电柔顺机构（PCM）的能量采集器的设计，包括一个聚偏二氟乙烯（PVDF）单压电晶片夹在基础上，并连接到一个在尖端的柔顺机构。顺应性机构具有两个挠曲件，其放大尖端位移以产生检测质量块的大运动和具有有效（接近二次）形状的低频第一模式。柔性机构被制造为具有柔性铰链的单独的、相对刚性的框架，简化了制造过程，并且包围和保护压电单晶片。PCM的桥接结构还可自限制对大幅值冲击的响应，从而提高器件的鲁棒性。实验表明，柔性铰链的刚度可以仔细调整，以接近理论的高功率输出和模态效率。
Piezoelectric energy harvesters typically perform poorly in the low frequency, low amplitude, and intermittent excitation environment of human movement. In this paper, a piezoelectric compliant mechanism (PCM) energy harvester is designed that consists of a polyvinylidene diflouoride (PVDF) unimorph clamped at the base and attached to a compliant mechanism at the tip. The compliant mechanism has two flexures that amplify the tip displacement to produce large motion of a proof mass and a low frequency first mode with an efficient (nearly quadratic) shape. The compliant mechanism is fabricated as a separate, relatively rigid frame with flexure hinges, simplifying the fabrication process, and surrounding and protecting the piezoelectric unimorph. The bridge structure of the PCM also self-limits the response to large amplitude impacts, improving the device robustness. Experiments show that the compliant hinge stiffness can be carefully tuned to approach the theoretical high power output and mode shape efficiency.