Design of vibro-impact electromagnetic ocean-wave energy harvesting system; an experimental study

Afsharfard, Aref; Shin, Hyungmin; Hosseini, Sajjad; Kim, Eun Soo; Lee, Inwon; Kim, Kyung Chun

doi:10.1016/j.oceaneng.2022.112168

Cited by 11 publications

(2 citation statements)

References 17 publications

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“…Adding nonlinearity to the system is one of the most appropriate strategies for enhancing the frequency bandwidth of a harvester [ 41 , 42 ]. Several techniques for exploiting nonlinearity have been studied, including duffing [ 43 , 44 , 45 , 46 ], impact [ 47 , 48 , 49 , 50 , 51 , 52 ], and bistable oscillator designs [ 53 , 54 , 55 , 56 , 57 , 58 ]. Recently, vibro-impact has been applied to vibration energy harvesters to boost harvesting efficiency.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Bistability for a Wider Bandwidth in Vibro-Impact Triboelectric Energy Harvesters

Qaseem

Ibrahim

2023

Micromachines

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Mechanical energy from vibrations is widespread in the ambient environment. It may be harvested efficiently using triboelectric generators. Nevertheless, a harvester’s effectiveness is restricted because of the limited bandwidth. To this end, this paper presents a comprehensive theoretical and experimental investigation of a variable frequency energy harvester, which integrates a vibro-impact triboelectric-based harvester and magnetic nonlinearity to increase the operation bandwidth and improve the efficiency of conventional triboelectric harvesters. A cantilever beam with a tip magnet was aligned with another fixed magnet at the same polarity to induce a nonlinear magnetic repulsive force. A triboelectric harvester was integrated into the system by utilizing the lower surface of the tip magnet to serve as the top electrode of the harvester, while the bottom electrode with an attached polydimethylsiloxane insulator was placed underneath. Numerical simulations were performed to examine the impact of the potential wells formed by the magnets. The structure’s static and dynamic behaviors at varying excitation levels, separation distance, and surface charge density are all discussed. In order to develop a variable frequency system with a wide bandwidth, the system’s natural frequency varies by changing the distance between the two magnets to reduce or magnify the magnetic force to achieve monostable or bistable oscillations. When the system is excited by vibrations, the beams vibrate, which causes an impact between the triboelectric layers. An alternating electrical signal is generated from a periodic contact-separation motion between the harvester’s electrodes. Our theoretical findings were experimentally validated. The findings of this study have the potential to pave the way for the development of an effective energy harvester that is capable of scavenging energy from ambient vibrations across a broad range of excitation frequencies. The frequency bandwidth was found to increase by 120% at threshold distance compared to the conventional energy harvester. Nonlinear impact-driven triboelectric energy harvesters can effectively broaden the operational frequency bandwidth and enhance the harvested energy.

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Section: Introductionmentioning

confidence: 99%

Magnetic Bistability for a Wider Bandwidth in Vibro-Impact Triboelectric Energy Harvesters

Qaseem

Ibrahim

2023

Micromachines

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“…Afsharfard et.al. discussed a wave converter designing for wave height of 1.2 m, period of 9.5s and depth of 100m [19]. From different generation technical point of views, some energy extraction techniques from the…”

Section: Introductionmentioning

confidence: 99%

Ocean Wave Energy Harvesting via Scotch Yoke-based Rotational Generation

Hossain¹,

Illias

2022

AJSE

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Harvesting energy from ocean wave is a promising renewable energy source due to its high efficiency, carbon-free, it is not affected by depletion of fossil fuels, and it is replenished constantly. The existing generators used in wave energy harvesting such as linear generator and slider crank mechanism have some limitations, which include lower efficiency and technologically challenging. Thus, in this work, wave energy harvesting technique using rotational generator based on scotch yoke mechanism is proposed. A typical slider crank to convert linear motion into rotational motion is replaced by scotch yoke mechanism to yield higher efficiency. A comparison of the performance of wave energy system between employing slider crank and scotch yoke is made to evaluate the superiority of the proposed mechanism. From the results obtained in this work, it is found that the output voltage of rotational generator employing scotch yoke mechanism is higher compared to that of rotational generator employing slider crank for the same input power. Thus, rotational generator by employing scotch yoke mechanism can be one of the alternative methods for ocean wave energy harvesting.

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Frequency Up-Conversion Piezoelectric-Electromagnetic Hybrid Wave Energy Harvester Based on Magnetic Coupling

Wang,

Lv,

Liu

et al. 2024

J. Electron. Mater.

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Design of vibro-impact electromagnetic ocean-wave energy harvesting system; an experimental study

Cited by 11 publications

References 17 publications

Magnetic Bistability for a Wider Bandwidth in Vibro-Impact Triboelectric Energy Harvesters

Magnetic Bistability for a Wider Bandwidth in Vibro-Impact Triboelectric Energy Harvesters

Ocean Wave Energy Harvesting via Scotch Yoke-based Rotational Generation

Frequency Up-Conversion Piezoelectric-Electromagnetic Hybrid Wave Energy Harvester Based on Magnetic Coupling

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