Mechanical frequency up-conversion for sub-resonance, low-frequency vibration harvesting

Edwards, Bryn; Aw, Kean C.; Hu, Aiguo Patrick

doi:10.1177/1045389x15624795

Cited by 20 publications

(15 citation statements)

References 22 publications

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“…In the modelling of such systems, vibro-impact motion between the magnets is generally not considered since impact only occurs at large accelerations. However, some studies [35][36][37][38][39] have employed vibroimpact beam systems to enhance the harvesting efficiency of MEH designs using frequency up-conversion. In these cases, magnets [35,36] or coils [37][38][39] are mounted on the free end of a cantilever beam as well as on a stopper or another beam.…”

Section: Vibro-impact Systems In Energy Harvestingmentioning

confidence: 99%

“…However, some studies [35][36][37][38][39] have employed vibroimpact beam systems to enhance the harvesting efficiency of MEH designs using frequency up-conversion. In these cases, magnets [35,36] or coils [37][38][39] are mounted on the free end of a cantilever beam as well as on a stopper or another beam. The theoretical modelling of such vibro-impact system is mostly done by simplifying the continuous beam system into a corresponding discrete mass-spring-damper system and modelling a non-smooth impact into a bilinear or non-smooth stiffness and damping, such as in Refs.…”

Section: Vibro-impact Systems In Energy Harvestingmentioning

confidence: 99%

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Nonlinear dynamics and triboelectric energy harvesting from a three-degree-of-freedom vibro-impact oscillator

Ouyang

Davis

2018

Nonlinear Dyn

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A triboelectric energy harvester based on a three-degree-of-freedom vibro-impact oscillator is presented. Both the dynamic model of the oscillator and the theoretical model of the oscillator-based triboelectric energy harvester are established. The dynamic response and its effect on the electrical output are considered for various mass ratios and mass spacings. The study leads to the conclusions that the symmetric mass configurations of the oscillator are more beneficial to energy harvesting than the asymmetric cases. The extent of the initial spacing between the masses influences the dynamics of the system and the electrical output by triggering grazing bifurcation. High-order periodicity is found to accompany a reduction in the electrical power. An increase in mass ratio tends to increase the electrical output, and there may exist an optimal mass ratio at which the electrical output is maximized. Chatter and sticking motion can improve the output performance dramatically, while resonance, as usual, corresponds to large amplitude response, but these large amplitudes are not optimal for triboelectric energy harvesting, and thus the maximal output does not appear around resonance. This is different from other types of vibration-based energy harvesters, such as piezoelectric and magneto-

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Section: Vibro-impact Systems In Energy Harvestingmentioning

confidence: 99%

Section: Vibro-impact Systems In Energy Harvestingmentioning

confidence: 99%

Nonlinear dynamics and triboelectric energy harvesting from a three-degree-of-freedom vibro-impact oscillator

Ouyang

Davis

2018

Nonlinear Dyn

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“…This mechanical impact delivers a large secondary force to the secondary beam. Edwards [ 16 ] et al presented a single cantilever FUC mechanism under stochastic excitation when configured as an electromagnetic energy harvester. Wang [ 17 ] et al presented a cantilever beam with magnets attached to the ends that impacted two flexible stoppers, which were placed on each side of the beam.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Four Electrical Interfacing Circuits in Frequency Up-Conversion Piezoelectric Energy Harvesting

Chen

Tang

et al. 2022

Micromachines

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Efficiently scavenging piezoelectric vibration energy is attracting a lot of interest. One important type is the frequency up-conversion (FUC) energy harvester, in which a low-frequency beam (LFB) impacts a high-frequency beam (HFB). In this paper, four interface circuits, standard energy harvesting (SEH), self-powered synchronous electric charge extraction (SP-SECE), self-powered synchronized switch harvesting on inductor (SP-SSHI) and self-powered optimized SECE (SP-OSECE), are compared while rectifying the generated piezoelectric voltage. The efficiencies of the four circuits are firstly tested at constant displacement and further analyzed. Furthermore, the harvested power under FUC is tested for different electromechanical couplings and different load values. The results show that SP-OSECE performs best in the case of a weak coupling or low-load resistance, for which the maximum power can be 43% higher than that of SEH. As the coupling level increases, SP-SSHI becomes the most efficient circuit with a 31% higher maximum power compared to that of SEH. The reasons for the variations in each circuit with different coupling coefficients are also analyzed.

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“…The mechanical-to-electrical energy conversion in VEHs can be achieved through either a piezoelectric [7], an electromagnetic [8], or an electrostatic transduction mechanism [9]. Piezoelectric energy harvesters generate power by cyclic straining of an electrically polarized material which, generally, results in high power densities [10].…”

Section: Introductionmentioning

confidence: 99%

“…Harvesters, with linear mechanical oscillators, suffer inherent limitations in terms of narrow bandwidth around the fundamental frequency and limited scalability to match the fundamental frequency to ambient vibration frequency upon device integration [14]. Bandwidth enhancements have been achieved through either smooth nonlinear harvesting [15,16], piecewise (non)linear harvesting [3,17], parametric excitation [18], multimodal harvesting [19,20], or frequency up-conversion [8,21] techniques, resulting in increased robustness to nonstationary vibrations. However, strong dependency on vibration magnitudes [17], aperiodicity of solutions [22] and limited low-frequency power generation [14] still limit the practical application of VEHs.…”

Section: Introductionmentioning

confidence: 99%

Design and Numerical Analysis of an Electrostatic Energy Harvester With Impact for Frequency Up-Conversion

Lensvelt

Fey

Mestrom

et al. 2020

Journal of Computational and Nonlinear Dynamics

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Integration of vibration energy harvesters (VEHs) with small-scale electronic devices may form an attractive alternative for relatively large batteries and can, potentially, increase their lifespan. However, the inherent mismatch between a harvester's high-frequency resonance, typically in the range 100−1000 Hz, relative to the available low-frequency ambient vibrations, typically in the range 10–100 Hz, means that low-frequency power generation in microscale VEHs remains a persistent challenge. In this work, we model a novel electret-based, electrostatic energy harvester (EEH) design. In this design, we combine an out-of-plane gap-closing comb (OPGC) configuration for the low-frequency oscillator with an in-plane overlap comb configuration for the high-frequency oscillator and employ impact for frequency up-conversion. An important design feature is the tunability of the resonance frequency through the electrostatic nonlinearity of the low-frequency oscillator. Impulsive normal forces due to impact are included in numerical simulation of the EEH through Moreau's time-stepping scheme which has, to the best of our knowledge, not been used before in VEH design and analysis. The original scheme is extended with time-step adjustments around impact events to reduce computational time. Using frequency sweeps, we numerically investigate power generation under harmonic, ambient vibrations. Results show improved low-frequency power generation in this EEH compared to a reference EEH. The EEH design shows peak power generation improvement of up to a relative factor 3.2 at low frequencies due to the occurrence of superharmonic resonances.

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Mechanical frequency up-conversion for sub-resonance, low-frequency vibration harvesting

Cited by 20 publications

References 22 publications

Nonlinear dynamics and triboelectric energy harvesting from a three-degree-of-freedom vibro-impact oscillator

Nonlinear dynamics and triboelectric energy harvesting from a three-degree-of-freedom vibro-impact oscillator

Comparison of Four Electrical Interfacing Circuits in Frequency Up-Conversion Piezoelectric Energy Harvesting

Design and Numerical Analysis of an Electrostatic Energy Harvester With Impact for Frequency Up-Conversion

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