Energy-harvesting device with mechanical frequency-up conversion mechanism for increased power efficiency and wideband operation

Jung, Seok-Min; Yun, Kwang-Seok

doi:10.1063/1.3360219

Cited by 212 publications

(114 citation statements)

References 7 publications

(1 reference statement)

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“…9,10 However, power densities in such designs are reduced due to the increased system volumes of the VEHs. Nonlinear techniques, such as bi-stable systems 11,12 and Duffing oscillation, [13][14][15] can effectively improve the frequency response with a broad bandwidth, but nonlinear vibrations of the harvesters would happen only when the environmental vibration intensity is large enough to induce the stretching force in the VEH's beam. Resonant frequency tuning [16][17][18] also has been investigated, with passive or active tuning by adjusting the preload of VEH's beam.…”

Section: Introductionmentioning

confidence: 99%

Multi-resonant wideband energy harvester based on a folded asymmetric M-shaped cantilever

Mao

et al. 2015

AIP Advances

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Multi-resonant wideband energy harvester based on a folded asymmetric M-shaped cantileverThis article reports a compact wideband piezoelectric vibration energy harvester consisting of three proof masses and an asymmetric M-shaped cantilever. The M-shaped beam comprises a main beam and two folded and dimension varied auxiliary beams interconnected through the proof mass at the end of the main cantilever. Such an arrangement constitutes a three degree-of-freedom vibrating body, which can tune the resonant frequencies of its first three orders close enough to obtain a utility wide bandwidth. The finite element simulation results and the experimental results are well matched. The operation bandwidth comprises three adjacent voltage peaks on account of the frequency interval shortening mechanism. The result shows that the proposed piezoelectric energy harvester could be efficient and adaptive in practical vibration circumstance based on multiple resonant modes. C

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Section: Introductionmentioning

confidence: 99%

Multi-resonant wideband energy harvester based on a folded asymmetric M-shaped cantilever

Mao

et al. 2015

AIP Advances

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“…Recently, hybrid nanogenerators combining several mechanisms, such as the use of piezoelectric and triboelectric principles to convert mechanical energy into electricity, have been attracting an increasing amount of attention, [10,[18][19][20][21][22][23][24][25][26][27][28][29][30]. Mahmoudi et al reported a multiphysics hybrid piezoelectric-electromagnetic vibration energy harvester with a nonlinear equation of motion for an enhancement power density up to 84% [20].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Electromagnetic and Triboelectric Nanogenerators with Multi-Impact for Wideband Frequency Energy Harvesting

Zhu

Wang

et al. 2017

Energies

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Abstract:We present a hybrid electromagnetic generator (EMG) and triboelectric nanogenerator (TENG) using a multi-impact approach for broad-bandwidth-frequency (10-45 Hz) energy harvesting. The TENG and the EMG were located at the middle and the free end of the cantilever beam, respectively. When the system was subjected to an external vibration, the cantilever beam would be in a nonlinear response with multiple impacts from a low frequency oscillator. The mathematical model included a TENG oscillator which can have multiple impacts on the cantilever, and the nonlinear Lorenz force which comes from the motion of the coil in the electromagnetic field. Due to the strong nonlinearity of the impacts from the TENG oscillator and the limited space for the free tip of the cantilever, the dynamic response of the cantilever presented a much broader bandwidth, with a frequency range from 10-45 Hz. We also found that the average generated power from TENG and EMG can reach up to 30 µW/m 2 and 53 µW, respectively. Moreover, the dynamic responses of the hybrid EMG and TENG were carefully analyzed, and we found that the measured experimental results and the numerical simulations results were in good agreement.

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“…With the objective of harvesting vibration energy, a great deal of researches on vibration-to-electric transformation using piezoelectric [1][2], electrostatic [3] and electromagnetic [4][5] transductions have been done in recent years. Compared with a piezoelectric and an electrostatic generator, an electromagnetic harvester is with a higher achievable energy density.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Electromagnetic and Multi-point Impacts Stoppers Coupling for Low Frequency Energy Harvesting

Zhu¹,

Zhu²,

Zhu³

2017

dtcse

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Abstract. We presented an electromagnetic and three oscillators multi-impact coupling device for a broad bandwidth frequency energy harvesting. The energy harvesting was achieved from low vibrations with limited amplitudes and quite low frequencies that were about 1/10 th of the resonance frequency in harvester. When an excitation frequency approaching the oscillators' resonant frequency, at least one of the oscillators will impact on a stiffer structure resulting in a higher "equivalent stiffness" resulting a much broader bandwidth with impacts. The Lorentz force was found that acted to counteract the cantilever free tip causing complicated dynamic responses, and this force was acting as energy dissipation. The inclusion of the three mechanical oscillators made energy harvesting possible when the excitation vibrations at quite low frequency as long as the high frequency cantilever was kept at a distance to prevent the Lorentz force to dominate. More specifically, the inclusion of the three mechanical impact oscillators made energy harvesting efficiently when excitation vibrations were at low frequency 5-70 Hz bandwidth.

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Energy-harvesting device with mechanical frequency-up conversion mechanism for increased power efficiency and wideband operation

Abstract: Frequency up-converted wide bandwidth piezoelectric energy harvester using mechanical impact A magnetoelectric energy harvester with the magnetic coupling to enhance the output performance

Cited by 212 publications

References 7 publications

Multi-resonant wideband energy harvester based on a folded asymmetric M-shaped cantilever

Multi-resonant wideband energy harvester based on a folded asymmetric M-shaped cantilever

Hybrid Electromagnetic and Triboelectric Nanogenerators with Multi-Impact for Wideband Frequency Energy Harvesting

Numerical Modeling of Electromagnetic and Multi-point Impacts Stoppers Coupling for Low Frequency Energy Harvesting

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