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The Identification of Period Doubling in a Nonlinear Two-Degree-of-Freedom Electromagnetic Vibrational Energy Harvester
IEEE/ASME Transactions on Mechatronics ( IF 5.673 ) Pub Date : 2020-06-05 , DOI: 10.1109/tmech.2020.3000431
Valeria Nico, Ronan Frizzell, Jeff Punch

Common vibrational energy harvesters are generally based on a linear mass-spring oscillator model, and these typically show narrow bandwidth and high resonant frequency at small scales. To overcome these problems, a two-degree-of-freedom nonlinear velocity-amplified energy harvester has been developed. The device comprises two masses, relatively oscillating one inside the other between four sets of magnetic springs. The magnetic springs introduce nonlinear effects, such as period doubling, that can be exploited to enhance the output power and bandwidth of the harvester. This article studies the dynamics of the harvester when a key geometrical parameter (the height of the device) is varied. For large height values, a significant increase of the output power in regions far from the resonant frequency of the device is observed, and the associated period-doubling effect was verified through high-speed imaging. It is demonstrated that nonlinear effects can be used to enhance the bandwidth of the device in order to harvest energy in regions far from resonance.

中文翻译:

非线性两自由度电磁振动能量采集器中周期加倍的辨识

常见的振动能量收集器通常基于线性质量弹簧振荡器模型,并且通常在小范围内显示出窄带宽和高共振频率。为了克服这些问题,已经开发了一种两自由度非线性速度放大的能量收集器。该装置包括两个质量块,它们在四组磁性弹簧之间在另一个内部相对振动。磁性弹簧会引入非线性效应,例如周期倍增,可以利用该效应来提高采集器的输出功率和带宽。本文研究了关键几何参数(设备的高度)发生变化时收割机的动力学特性。对于较大的高度值,在远离设备谐振频率的区域中观察到输出功率的显着增加,并通过高速成像验证了相关的周期倍增效果。已经证明,非线性效应可用于增强设备的带宽,以便在远离共振的区域中收集能量。
更新日期:2020-06-05
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