A self-tuning resonator for vibration energy harvesting

Aboulfotoh, Noha; Arafa, Mustafa; Megahed, Saïd M.

doi:10.1016/j.sna.2013.07.030

Cited by 74 publications

(37 citation statements)

References 19 publications

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“…In this context, Aboilfotoh et al. designed a self‐tuning electromagnetic energy harvester using a cantilever beam mounted on a shaker with a permanent magnet attached to a movable tray and driven by a stepper motor. A microcontroller was used to detect the frequency to generate signal for the stepper motor in order to keep the device matching its resonant frequency.…”

Section: Rationalization For Ambient Energy Harvestingmentioning

confidence: 99%

“…Frequency adjustment is known to be a problem for vibration energy-harvesting devices, as they are designed to resonate at natural frequencies for efficient output, but due to several factors, for example, slight deviation from operation at resonance, quality factors, and manufacturing errors could lead to the reduction in output power generated [104][105][106]. In this context, Aboilfotoh et al [107] designed a self-tuning electromagnetic energy harvester using a cantilever beam mounted on a shaker with a permanent magnet attached to a movable tray and driven by a stepper motor. A microcontroller was used to detect the frequency to generate signal for the stepper motor in order to keep the device matching its resonant frequency.…”

Section: Self-tuning Electromagnetic Energy Harvestermentioning

confidence: 99%

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Energy harvesting for assistive and mobile applications

Bhatnagar¹,

Owende²

2015

Energy Science & Engineering

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Technology advances have enabled modification of the size and shape of the electronic components to the microscale, with commensurate scaling down of their power requirements to milliwatts and microwatt range. Consequently, many complex electronic systems and devices such as wearable medical and autonomous devices consume power in the range less than 200 lW, and wireless sensor networks in the range lW to 100 mW are operated on battery power. Due to the salient limitations of battery power, such as longevity of charge and where applicable, the requirement for periodic recharging, possibilities for utilization of autonomous energy sources is critical for operation of such devices. Ambient energy sources, such as vibrations (1 lW to 20 mW), motion (wide range in power outputs), temperature gradient (0.5-10 mW), radiofrequency waves (>180 lW/cm 2 ), light (100 lW/cm 2 to 100 mW/cm 2 ), acoustics (0.003-0.11 lW/cm 2 ), and many other, have the potential to directly power the electronic device. Ambient energy harvesting, when used separately or in conjunction with batteries, will enhance the longevity of equipment operations requiring portable or autonomous power supply. This paper reviews the state of the art in energy-harvesting techniques, power conversion, and characterization of mini-and microscale self-sustaining power generation systems in the range 600 lW to 5 W, specifically focusing on low-power system applications, for personal assistive and mobile technology devices.

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Section: Rationalization For Ambient Energy Harvestingmentioning

confidence: 99%

Section: Self-tuning Electromagnetic Energy Harvestermentioning

confidence: 99%

Energy harvesting for assistive and mobile applications

Bhatnagar¹,

Owende²

2015

Energy Science & Engineering

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“…Magnetic forces based MTTs rely on the interaction among magnets with the aim of altering the stiffness of a RVEH, thus changing its mechanical resonance frequency [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Usually two magnets are used, one is part of the oscillating mass and the other is movable.…”

Section: Magnetic Forces Based Mttsmentioning

confidence: 99%

Tuning Techniques for Piezoelectric and Electromagnetic Vibration Energy Harvesters

Costanzo

Vitelli

2020

Energies

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This paper is focused on resonant vibration energy harvesters (RVEHs). In applications involving RVEHs the maximization of the extraction of power is of fundamental importance and a very crucial aspect of such a task is represented by the optimization of the mechanical resonance frequency. Mechanical tuning techniques (MTTs) are those techniques allowing the regulation of the value of RVEHs mechanical resonance frequency in order to make it coincident with the vibration frequency. A very great number of MTTs has been proposed in the literature and this paper is aimed at reviewing, classifying and comparing the main of them. In particular, some important classification criteria and indicators are defined and are used to put in evidence the differences existing among the various MTTs and to allow the reader an easy comparison of their performance. Finally, the open issues concerning MTTs for RVEHs are identified and discussed.

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“…Inertial devices have successfully been used, however they suffer from narrow bandwidth and are inefficient at low frequencies. This has prompted research in tunable devices [1,2], nonlinear resonators [3] and devices that possess multiple resonance frequencies [4,5]. In situations where both persistent mechanical vibration and a fixed reference surface can be found in close proximity, it becomes attractive to utilize the resulting relative motion to drive the mechanical parts of a power generator.…”

Section: Introductionmentioning

confidence: 99%

Motion amplification using a flextensional compliant mechanism for enhanced energy harvesting

Arafa

2016

SPIE Proceedings

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In vibration-based energy harvesting, ambient vibration often occurs in such small amplitudes that it cannot be used to drive electrical generators directly. To maximize the amount of output power, the input motion is usually amplified before being used for power generation. This work presents a non-resonant piezoelectric energy harvester that relies on a compliant mechanism to amplify a given persistent input motion in order to enhance the power output. The device can be used in situations where a small cyclic relative motion occurs between two surfaces, and where a device can be fitted to extract energy. The use of a compliant mechanism, as opposed to conventional gear drives or linkages, alleviates problems of excessive clearances, friction and power losses. A finite element model is developed to investigate the effect of the various design parameters on the system performance in terms of the amplification ratio, stiffness and output voltage. Findings of the present work are verified both numerically and experimentally on a camdriven polymer mechanism. A parametric study is conducted to investigate the most influential variables in an attempt to optimize the design parameters for maximum power output. A magnetically bistable piezoelectric beam, driven by the compliant mechanism, is finally presented and provides substantially greater amounts of output power.

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A self-tuning resonator for vibration energy harvesting

Cited by 74 publications

References 19 publications

Energy harvesting for assistive and mobile applications

Energy harvesting for assistive and mobile applications

Tuning Techniques for Piezoelectric and Electromagnetic Vibration Energy Harvesters

Motion amplification using a flextensional compliant mechanism for enhanced energy harvesting

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