A new concept of vibration synergized energy harvesting is proposed for ultra-low frequency scenarios. A dual-oscillator synergized piezoelectric energy harvester (DOS-PEH), inspired by hummingbirds, is designed to demonstrate the new concept, both theoretically and experimentally. Mimicking the synergy mechanism of hummingbird muscles and wings, the DOS-PEH adopts a supporting oscillator (SO) and a buckled beam designated as the dominating oscillator (DO) to synergize the vibrations through magnetic coupling. SO engenders a hinge-support-like configuration at the beam midspan, by which DO exhibits three stable equilibrium positions while taking on four stable equilibrium states, including two second buckling modes that lower snapping force to facilitate snap-through oscillations. The non-contact magnetic force, introduced by SO, acts as a link that cohesively connects the dual oscillators. It enables continuous vibration transmission from the ambient environment, through SO, and ultimately to DO. A fresh bandwidth, extending from 2.5 to 10 Hz, of 7.5 Hz emerges under 0.4 g excitation. The DOS-PEH, in general, achieves the broadband, stable, and progressively improving voltage output across the ultra-low frequency range. Further, the output voltage of the DOS-PEH is about 70 times higher than that of the collision-based piezoelectric energy harvester (C-PEH), and the operational bandwidth is broadened to 136 %. It highlights the contribution of synergistic vibration to the ultra-low-frequency energy harvesting.

中文翻译：

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受蜂鸟启发的双振荡器协同压电能量收集器，用于超低频


针对超低频场景，提出了一种振动协同能量收集的新概念。受蜂鸟启发的双振荡器协同压电能量收集器 （DOS-PEH） 旨在从理论和实验上展示这一新概念。DOS-PEH 模仿蜂鸟肌肉和翅膀的协同机制，采用支撑振荡器 （SO） 和指定为主导振荡器 （DO） 的屈曲梁，通过磁耦合协同振动。SO 在梁中跨处产生类似铰链支撑的配置，通过该配置，DO 表现出三个稳定的平衡位置，同时处于四个稳定的平衡状态，包括两个第二屈曲模式，这些模式降低了捕捉力以促进突弹跳变振荡。SO 引入的非接触式磁力充当将双振荡器紧密相连的纽带。它能够从周围环境连续传递振动，通过 SO，并最终传递到 DO。在 0.4 g 激励下会出现 7.5 Hz 的新带宽，从 2.5 到 10 Hz。通常，DOS-PEH 可在超低频范围内实现宽带、稳定和逐步改进的电压输出。此外，DOS-PEH 的输出电压比基于碰撞的压电能量收集器 （C-PEH） 高约 70 倍，工作带宽扩大到 136%。它强调了协同振动对超低频能量收集的贡献。