Podder Pranay, Mallick Dhiman, Amann Andreas, Roy Saibal
Micro-Nano Systems Centre, Tyndall National Institute, Lee Maltings, Dyke Parade, Cork, Ireland.
Photonics Centre, Tyndall National Institute, Lee Maltings, Dyke Parade, Cork, Ireland.
Sci Rep. 2016 Nov 22;6:37292. doi: 10.1038/srep37292.
Ambient mechanical vibrations have emerged as a viable energy source for low-power wireless sensor nodes aiming the upcoming era of the 'Internet of Things'. Recently, purposefully induced dynamical nonlinearities have been exploited to widen the frequency spectrum of vibration energy harvesters. Here we investigate some critical inconsistencies between the theoretical formulation and applications of the bistable Duffing nonlinearity in vibration energy harvesting. A novel nonlinear vibration energy harvesting device with the capability to switch amidst individually tunable bistable-quadratic, monostable-quartic and bistable-quartic potentials has been designed and characterized. Our study highlights the fundamentally different large deflection behaviors of the theoretical bistable-quartic Duffing oscillator and the experimentally adapted bistable-quadratic systems, and underlines their implications in the respective spectral responses. The results suggest enhanced performance in the bistable-quartic potential in comparison to others, primarily due to lower potential barrier and higher restoring forces facilitating large amplitude inter-well motion at relatively lower accelerations.
对于旨在迎接即将到来的“物联网”时代的低功耗无线传感器节点而言，环境机械振动已成为一种可行的能量来源。最近，人们利用有意引入的动态非线性来拓宽振动能量收集器的频谱。在此，我们研究了双稳态达芬非线性在振动能量收集的理论公式与应用之间的一些关键不一致之处。我们设计并表征了一种新型非线性振动能量收集装置，该装置能够在单独可调的双稳态二次、单稳态四次和双稳态四次势之间切换。我们的研究突出了理论双稳态四次达芬振荡器与实验采用的双稳态二次系统在大挠度行为上的根本差异，并强调了它们在各自频谱响应中的影响。结果表明，与其他情况相比，双稳态四次势具有更高的性能，这主要是由于较低的势垒和较高的恢复力有助于在相对较低的加速度下实现大幅度的阱间运动。
