A 2DOFvibrational Energy Harvester Exploiting Velocity Amplification: Modeling and Testing

Boco, Elisabetta; Nico, Valeria; O’Donoghue, Declan; Frizzell, Ronan; Kelly, Gerard; Punch, Jeff

doi:10.1007/978-3-319-27753-0_9

Cited by 2 publications

(3 citation statements)

References 25 publications

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“…The 2DoF velocity-amplified electromagnetic VEH [2,11,12] examined in this paper is shown in figure 1. It consists of two masses, an external larger primary mass (Mass 1) and a smaller secondary mass (Mass 2).…”

Section: System Of Interestmentioning

confidence: 99%

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Nonlinear analysis of a two-degree-of-freedom vibration energy harvester using high order spectral analysis techniques

Nico

Frizzell

Punch

2017

Smart Mater. Struct.

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Conventional vibration energy harvesters are generally based on linear massspring oscillator models. Major limitations with common designs are their narrow bandwidths and the increase of resonant frequency as the device is scaled down. To overcome these problems, a two-degree-of-freedom nonlinear velocity-amplified energy harvester has been developed. The device comprises two masses, oscillating one inside the other, between four sets of nonlinear magnetic springs. Impacts between the masses allow momentum transfer from the heavier mass to the lighter, providing velocity amplification. This paper studies the nonlinear effects introduced by the presence of magnetic springs, using high order spectral analysis techniques on experimental and simulated data obtained for a range of excitation levels and magnetic spring configurations, which enabled the effective spring constant to be varied. Standard power spectrum analysis only provide limited information on the response of nonlinear systems. Instead, bispectral analysis is used here to provide deeper insight of the complex dynamics of the nonlinear velocity-amplified energy harvester. The analysis allows identification of period-doubling and couplings between modes that could be used to choose geometrical parameters to enhance the bandwidth of the device.

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Section: System Of Interestmentioning

confidence: 99%

“…For each coil and at each time step of integration, emf and α were calculated using (11) and (12). The total emf tot and α tot , given by the sum of the single emf and α, were used in (9), to give a better representation of the transduction mechanism.…”

Section: System Equationsmentioning

confidence: 99%

Nonlinear analysis of a two-degree-of-freedom vibration energy harvester using high order spectral analysis techniques

Nico

Frizzell

Punch

2017

Smart Mater. Struct.

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“…The electromagnetic technique can be applied in many scales and produces relatively high power densities given a relatively high velocity between the magnet and coil [ 5 ], and smaller internal impedance and larger current output compared to the piezoelectric technique [ 6 , 7 ]. The electromagnetic technique also possesses a good output performance and process compatibility [ 4 ], offers a high efficiency energy conversion, and a considerably low frequency operation due to a simple mechanical resonator composition [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Karman Vortex Creation Using Cylinder for Flutter Energy Harvester Device

et al. 2017

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This study presents the creation of a Karman vortex for a fluttering electromagnetic energy harvester device using a cylinder. The effects of two parameters, which are the diameter and the position of the cylinder, were investigated on the Karman vortex profile and the amplitude of the fluttering belt, respectively. A simulation was conducted to determine the effect of the creation of the Karman vortex, and an experiment was performed to identify influence of the position of the cylinder on the fluttering belt amplitude. The results demonstrated that vortex-induced vibration occurred at the frequency of the first natural mode for the belt at 3 cm and 10 cm for the diameter and position of the cylinder, respectively. Under such configuration, an electromagnetic energy harvester was attached and vibrated via the fluttering belt inside the turbulent boundary layers. This vibration provides a measured output voltage and can be used in wireless sensors.

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A 2DOFvibrational Energy Harvester Exploiting Velocity Amplification: Modeling and Testing

Cited by 2 publications

References 25 publications

Nonlinear analysis of a two-degree-of-freedom vibration energy harvester using high order spectral analysis techniques

Nonlinear analysis of a two-degree-of-freedom vibration energy harvester using high order spectral analysis techniques

Karman Vortex Creation Using Cylinder for Flutter Energy Harvester Device

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