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首页> 外文期刊>Energy Conversion & Management >Bio-inspired bi-stable piezoelectric harvester for broadband vibration energy harvesting
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Bio-inspired bi-stable piezoelectric harvester for broadband vibration energy harvesting

机译：生物启发双稳定压电收割机，用于宽带振动能量收获

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摘要

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.
机译：通过Venus Flytrap的快速形状过渡，提出了一种新的低成本，双稳态压电能收割机，分析，实验测试，以实验测试宽带能量收集。收割机由压电宏纤维复合物（MFC）换能器，尖端质量和两个具有弯曲和扭曲变形的子梁组成，所述弯曲和扭曲通过使用刚性尖端块在自由端的预置分约束产生的扭曲变形。不同于由非线性磁力或层压复合材料中的残余应力实现的双稳定收割机的不同，生物启发双稳定压电能量收割机存储由子梁的互束的互际自限制引起的潜在能量，并收获大能释放的大能在快速形状过渡期间。引入了详细的设计步骤和原则，并制作了原型以证明和验证该概念。当Harvester跳跃在稳定状态之间时，收割机的实验测量的非线性力 - 位移曲线表现出不连续的特征。在扫描频率和谐波激发下，研究了拟议的生物启发双稳态压电能量收割机的动态。结果表明，收割机的子梁经历了在快照期间的局部振动，包括宽带高频振荡。收割机的能量收集性能在9.0-14.0Hz的频率范围内以不同的激发水平评价。宽带能量收集在相对较高的激发水平上实现。在励磁频率为10Hz的激发频率下收获0.193mW的平均功率输出为8.2k，振幅为4.0g。

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