Bio-inspired bi-stable piezoelectric harvester for broadband vibration energy harvesting
Bio-inspired bi-stable piezoelectric harvester for broadband vibration energy harvesting
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DOI：
10.1016/j.enconman.2020.113174
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发表时间：
2020-10-15
影响因子：
10.4
通讯作者：
Zuo, Lei
中科院分区：
文献类型：
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作者：
Qian, Feng;Hajj, Muhammad R.;Zuo, Lei
受捕蝇器形状快速变化的启发，提出了一种新型的低成本、双稳压电能量采集器，并对其进行了分析和实验测试。该收割机由一个压电巨纤维复合材料(MFC)换能器、一个尖端质量块和两个子梁组成，子梁的弯曲和扭转变形是由刚性尖端质量块在自由端的预位移约束造成的。不同于由层合复合材料中的非线性磁力或残余应力实现的双稳态采集器，仿生双稳态压电能量采集器存储由子梁的相互自约束产生的势能，并获取快速形状转变过程中释放的大量能量。给出了详细的设计步骤和设计原则，并制作了样机进行验证。实验测得的收割机非线性力位移曲线在收割机的稳态跳跃过程中呈现出不连续的特征。研究了仿生双稳态压电能量采集器在扫频和简谐激励下的动力学特性。结果表明，在跳跃过程中，收割机的子梁经历了包括宽带高频振荡在内的局部振动。在9.0-14.0赫兹的频率范围内，对不同激励水平下收割机的能量采集性能进行了评估。在相对较高的激发能级下，实现了宽带能量采集。在激励频率为10 Hz、幅值为4.0g时，当负载电阻为8.2K时，平均输出功率为0.193 mW。
Inspired by the rapid shape transition of the Venus flytrap, a novel low-cost, bi-stable piezoelectric energy harvester is proposed, analyzed, and experimentally tested for the purpose of broadband energy harvesting. The harvester consists of a piezoelectric macro fiber composite (MFC) transducer, a tip mass, and two sub-beams with bending and twisting deformations created by pre-displacement constraints at the free ends using rigid tip-mass blocks. Different from bi-stable harvesters realized by nonlinear magnetic forces or residual stresses in laminate composites, the bio-inspired bi-stable piezoelectric energy harvester stores the potential energy induced by the mutual self-constraint of the sub-beams and harvests the large energy released during the rapid shape transition. Detailed design steps and principles are introduced and a prototype is fabricated to demonstrate and validate the concept. The experimentally measured nonlinear force-displacement curve of the harvester exhibits a discontinuous feature as the harvester jumps between the stable states. The dynamics of the proposed bio-inspired bi-stable piezoelectric energy harvester is investigated under sweeping frequency and harmonic excitations. The results show that the sub-beams of the harvester experience local vibrations including broadband high-frequency oscillations during the snap-through. The energy harvesting performance of the harvester is evaluated at different excitation levels over the frequency range of 9.0-14.0 Hz. Broadband energy harvesting is attained at relatively high excitation levels. An average power output of 0.193 mW for a load resistance of 8.2 k is harvested at the excitation frequency of 10 Hz and amplitude of 4.0 g.