Broadband energy harvesting with mechanically coupled harvesters

Malaji, P. V.; Ali, Shaikh Faruque

doi:10.1016/j.sna.2016.12.003

Cited by 34 publications

(17 citation statements)

References 26 publications

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“…Yildrim et al [28], EI-Sayed et al [29], carried out an extensive literature review covering the development in the design of VBEH and piezoelectric harvesters with various configurations and applications, and various techniques such as the use of a mechanical amplifier, multimodal arrays, etc., for enhancing the harvested power and widening of operation range. Malaji and Ali [30], Wang et al [31], and Siang et al [32] have carried out research studies on the methods of enhancing harvester output power, using different electrical coil and magnet system configurations.…”

Section: Literature Reviewmentioning

confidence: 99%

Experimental studies on the effect of shunted electrical loads on the performance of a vibration-based electromagnetic energy harvester

Patil¹,

Sakri²

2021

FME Transactions

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At present, the researchers are grappling with the problems of maximizing the output power from a vibration-based electromagnetic energy harvester (VBEH). The parameters affecting the VBEH output power are: electrical damping ratio (ze), mechanical damping ratio (zm) and load impedances of shunted electrical load. Therefore, in this work, the experimental studies are carried out to study the effect of shunted electrical load on: i) the power output of VBEH and, ii) the determination of ze which maximizes the output power. For this purpose, a VBEH is designed and developed to obtain high open-circuit voltage. The effect of resistive, inductive, and capacitive loads on output power of VBEH is investigated using experimental setup developed exclusively for the same. The experimental results reveal that the output power of VBEH is maximum: i) at the resonant frequency ii) when equivalent resistive load impedance equals the internal resistance of electromagnetic coil and iii) value of ze is very small when compared to zm.

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Section: Literature Reviewmentioning

confidence: 99%

Experimental studies on the effect of shunted electrical loads on the performance of a vibration-based electromagnetic energy harvester

Patil¹,

Sakri²

2021

FME Transactions

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“…To find a periodic solution to Equations (15), (16) and (17), an appropriate set of initial conditions (ߟ ଵ , ߟ ଶ , ߟ ଷ ) must be identified. To proceed with the shooting technique, for convenience, the following variables are defined:…”

Section: Model Description and Mathematical Modellingmentioning

confidence: 99%

“…Erturk and Inman [15] investigated broadband high-energy orbits in a bistable piezomagnetoelastic energy harvester over a range of excitation frequencies. Malaji and Ali [16] analysed broadband energy harvesting using multiple linear harvesters. They showed that the bandwidth of harvesting can be increased by using an array of coupled pendulums with mechanical grounding.…”

Section: Introductionmentioning

confidence: 99%

Minimising the effects of manufacturing uncertainties in MEMS Energy harvesters

Madinei

Khodaparast

Friswell

et al. 2018

Energy

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“…There are different techniques to address this problem, such as widening the bandwidth of the harvester and tuning the resonance frequency of a single generator periodically so that it matches the frequency of the ambient vibration. Bandwidth can be widened by designing the harvester to adjust its natural frequencies [13,14] and with devices having multiple oscillators [15][16][17]. Moreover, several studies [18][19][20][21][22][23][24] have considered nonlinear behavior to increase the power generation over a wider frequency range.…”

Section: Introductionmentioning

confidence: 99%

Design of a self-tunable, variable-length pendulum for harvesting energy from rotational motion

Hassan¹,

Osman²,

Khattab³

et al. 2020

J. vibroeng.

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In this paper, a self-tunable energy harvester based on pendulum oscillations with a mechanical motion rectifier (MMR) system, which can convert vibration into electrical energy, is proposed. The harvester is composed of a pendulum excited by a slider-crank mechanism. The pendulum system is designed to automatically adjust its own natural frequency to match that of the imposed base excitation. Frequency adjustment in a proposed pendulum-type energy harvester is achieved by varying the length of the pendulum rod through changing the position of pendulum mass which mounted at its tip. The pendulum mass is driven by a ball screw through a stepper motor which controls the length of the pendulum automatically in accordance with the frequency of the external motion. The base motion frequency is detected by an infrared sensor. An ultrasonic distance sensor is used to detect the length of the pendulum rod and feeds this information to a microcontroller to obtain the corresponding natural frequency from a lookup table. The microcontroller calculates the frequency difference between natural frequency and excitation frequency and converts this value into a length difference through another lookup table. The microcontroller then gives instructions to drive a stepper motor through a sequence of steps to achieve the target length and keeps the device in resonance state to harvest maximum power during operation. Different time detection intervals were studied to investigate their effect on the tuning process. This study showed that the longer time intervals increase the detection accuracy for the calculation of low excitation frequency. The amount of energy consumed during the tuning process to adjust the pendulum length is presented. In this context, the consumed energy is only needed until the resonance of the device matches the excitation frequency. The harvester system was studied numerically and experimentally. Based on the findings of this work, the natural frequency of the harvester is successfully tuned below 0.7 Hz, when the length of pendulum rod is changed from 550 mm to 900 mm, generating power from 1.78 W to 4.1 W at an optimal load resistance value of 10 Ω and 3 Ω respectively at maximum excitation amplitude of 120 mm. Therefore, the proposed pendulum system can be used as an efficient harvester for producing power in low-frequency applications (< 1 Hz).

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Broadband energy harvesting with mechanically coupled harvesters

Cited by 34 publications

References 26 publications

Experimental studies on the effect of shunted electrical loads on the performance of a vibration-based electromagnetic energy harvester

Experimental studies on the effect of shunted electrical loads on the performance of a vibration-based electromagnetic energy harvester

Minimising the effects of manufacturing uncertainties in MEMS Energy harvesters

Design of a self-tunable, variable-length pendulum for harvesting energy from rotational motion

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