Optimization of Coil Parameters for a Nonlinear Two Degree-of-Freedom (2DOF) Velocity-amplified Electromagnetic Vibrational Energy Harvester

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

doi:10.5220/0005411901190128

Cited by 8 publications

(6 citation statements)

References 22 publications

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“…It is noted that nonlinear VEHs are often tested with increasing and decreasing frequency sweeps (Boco et al, 2015). However, this approach was not valid in the current work since the testing procedure used effectively stopped the masses in the transition between frequency points.…”

Section: Methodsmentioning

confidence: 99%

Experimental characterisation of dual-mass vibration energy harvesters employing velocity amplification

Frizzell

Kelly

Cottone

et al. 2016

Journal of Intelligent Material Systems and Structures

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Vibration energy harvesting extracts energy from the environment and can mitigate reliance on battery technology in wireless sensor networks. This article presents the nonlinear responses of two multi-mass vibration energy harvesters that employ a velocity amplification effect. This amplification is achieved by momentum transfer from larger to smaller masses following impact between masses. Two systems are presented that show the evolution of multi-mass vibration energy harvester designs: (1) a simplified prototype that effectively demonstrates the basic principles of the approach and (2) an enhanced design that achieves higher power densities and a wider frequency response. Various configurations are investigated to better understand the nonlinear dynamics and how best to realise future velocity-amplified vibration energy harvesters. The frequency responses of the multi-mass harvesters show that these devices have the potential to reduce risks associated with deploying vibration energy harvester devices in wireless sensor network applications; the wide frequency response reduces the need to re-tune the harvesters following frequency variations of the source vibrations.

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Section: Methodsmentioning

confidence: 99%

Experimental characterisation of dual-mass vibration energy harvesters employing velocity amplification

Frizzell

Kelly

Cottone

et al. 2016

Journal of Intelligent Material Systems and Structures

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“…However, the actual mechanism of the electromagnetic energy transduction is not described in detail. This lack of clarity in the electromagnetic model is proposed as the reason why a majority of articles in the area of electromagnetic energy harvesting (Boco et al, 2015; Cottone et al, 2014; Foisal et al, 2012; Fu et al, 2014; Joon Kim et al, 2010; Mitcheson et al, 2004; Oliver and Priya, 2009; Williams and Yates, 1995; Yang et al, 2009) present Bl x · as the model of the electromagnetic transducer. Other authors (Cepnik et al, 2011; Mizuno and Chetwynd, 2003; Yang et al, 2009) have highlighted that the magnetic field due to the oscillating magnet is not constant in the coil.…”

Section: Electrical Modelmentioning

confidence: 99%

Characterisation of anti-resonance in two-degree-of-freedom electromagnetic kinetic energy harvester, with modified electromagnetic model

O'Riordan

Frizzell

O'Connell

et al. 2018

Journal of Intelligent Material Systems and Structures

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This article presents a detailed approach to the analysis of a two-degree-of-freedom electromagnetic kinetic energy harvester. These systems use multiple disconnected masses that can impact each other and the harvester housing. This causes complex dynamics in the system as significant momentum is transferred between the masses and, ultimately, results in strongly nonlinear behaviour. One particular nonlinear phenomenon of interest, which has not been previously characterised, is anti-resonance. Observing this phenomenon is important as it highlights efficient energy transfer between the masses, and maximising its effect can be used to enhance the harvesters’ overall performance. A range of mathematical techniques are used to better explain the concept of anti-resonance and how it can be used to improve the understanding of the system dynamics. In addition, the widely used model for electromagnetic transduction is amended to give a more precise representation of the transducer force for this embodiment of the kinetic energy harvester. This unique analysis yields a rich modelling approach that can be used to inform future kinetic energy harvester designs by identifying and optimising key design parameters. Comparisons are made with experimental measurements of a two-mass electromagnetic kinetic energy harvester, validating the modelling approach.

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“…To overcome the problem of narrow bandwidth, a two-degree-of-freedom (2DoF) EM-VEH device that exploits multiple masses and a patented velocity-amplification principle has been developed by the authors’ group [10,11,12,13]. In this harvester, harmonic and random excitations can be used as vibration sources for producing higher voltage and power than in prior art.…”

Section: Introductionmentioning

confidence: 99%

A Vibration Energy Harvester and Power Management Solution for Battery-Free Operation of Wireless Sensor Nodes

Rodrı́guez

Nico

Punch

2019

Sensors

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Electromagnetic Vibration Energy Harvesting (EM-VEH) is an attractive alternative to batteries as a power source for wireless sensor nodes that enable intelligence at the edge of the Internet of Things (IoT). Industrial environments in particular offer an abundance of available kinetic energy, in the form of machinery vibrations that can be converted into electrical power through energy harvesting techniques. These ambient vibrations are generally broadband, and multi-modal harvesting configurations can be exploited to improve the mechanical-to-electrical energy conversion. However, the additional challenge of energy conditioning (AC-to-DC conversion) to make the harvested energy useful brings into question what specific type of performance is to be expected in a real industrial application. This paper reports the operation of two practical IoT sensor nodes, continuously powered by the vibrations of a standard industrial compressor, using a multi-modal EM-VEH device, integrated with customised power management. The results show that the device and the power management circuit provide sufficient energy to receive and transmit data at intervals of less than one minute with an overall efficiency of about 30%. Descriptions of the system, test-bench, and the measured outcomes are presented.

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Optimization of Coil Parameters for a Nonlinear Two Degree-of-Freedom (2DOF) Velocity-amplified Electromagnetic Vibrational Energy Harvester

Cited by 8 publications

References 22 publications

Experimental characterisation of dual-mass vibration energy harvesters employing velocity amplification

Experimental characterisation of dual-mass vibration energy harvesters employing velocity amplification

Characterisation of anti-resonance in two-degree-of-freedom electromagnetic kinetic energy harvester, with modified electromagnetic model

A Vibration Energy Harvester and Power Management Solution for Battery-Free Operation of Wireless Sensor Nodes

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