An Autoparametric, Electromagnetic Ambient Vibration Energy Harvester

Santen, J. G. van; Kapania, Nitin R.; Lee, Christopher L.

doi:10.2514/6.2011-2005

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…The L-shaped beam (following a previous design 9,11 ) and the coil act as the transducers while the circuit rectifies and boosts the output voltage to meet the minimum threshold required to power a wireless transmitter.…”

Section: Design Modeling and Fabricationmentioning

confidence: 99%

“…An electromagnetic, vibration energy harvester based upon the dynamics of a 2:1 tuned, L-shaped beam structure has been shown to exhibit such an autoparametric response. 11 Ambient vibration energy harvesters often use electromagnetic or piezoelectric transducers to convert vibrations to electrical energy. To a lesser extent, magnetostrictive materials, typically used in power transformers and current transducers, have been used to construct harvesters.…”

Section: Introductionmentioning

confidence: 99%

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Vibration energy harvesting using the nonlinear oscillations of a magnetostrictive material

2012

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A novel magnetostrictive-material-based device concept to convert ambient mechanical vibration into electricity has been designed, fabricated, and tested. In order to harvest energy over a greater frequency range as compared to stateof-the-art devices, an L-shaped beam which is tuned so that the first two (bending) natural frequencies have a (near) two-to-one ratio is used as a mechanical transducer to generate nonlinear oscillations. Under harmonic excitation, an internal resonance or autoparametric, dynamic response can occur in which one vibration mode parametrically excites a second vibration mode resulting in significant displacement of both modes over an extended frequency range. A magnetostrictive material, Metglas 2605SA1, is used to convert vibration into electricity. Vibrationinduced strain in the Metglas changes its magnetization which in turn generates current in a coil of wire. Metglas is highly flexible so it can undergo large displacement and does not fatigue under extended excitation. Demonstration devices are used to study how this nonlinear response can be exploited to generate electricity under singlefrequency, harmonic and random base excitation.

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Section: Design Modeling and Fabricationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Vibration energy harvesting using the nonlinear oscillations of a magnetostrictive material

2012

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“…Displacement, voltage, and power generation from a harvester with a 2:1 internal resonance were presented as frequency response functions. Representative experimental measurements from a prototype of an electromagnetic L-beam harvester with a 2:1 internal resonance, subject to harmonic base excitation demonstrated that power could be generated over an extended frequency range (as compared to a linear-dynamics-based harvester) 18 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced vibration energy harvesting using nonlinear oscillations

2015

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Results for the design and testing of an electromagnetic device that converts ambient mechanical vibration into electricity are presented. The design of the device is based on an L-shaped beam structure which is tuned so that the first two natural frequencies have a near two-to-one ratio which is referred to as an internal resonance or autoparametic condition. It is shown that in contrast to single degree-of-freedom, linear-dynamics-based vibration harvesters which convert energy in a very narrow frequency band the prototype can generate power over an extended frequency range when subject to harmonic, base displacement excitation.

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