The Experts below are selected from a list of 29346 Experts worldwide ranked by ideXlab platform
Gwiy-sang Chung - One of the best experts on this subject based on the ideXlab platform.
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Frequency tuning design for vibration-driven electromagnetic Energy Harvester
IET Renewable Power Generation, 2015Co-Authors: Byung-chul Lee, Gwiy-sang ChungAbstract:The common resonant-based vibration Energy Harvester effectively converts mechanical vibration to electrical power when an ambient excitation frequency matches the specific resonant frequency of the device. The resonant frequencies of Energy Harvesters are generally fixed during the design process and cannot be changed after fabrication. Therefore frequency tuning technology that allows for operation in a wide frequency range is desirable for a vibration Energy Harvester. In this study, the authors proposed a novel frequency tuning design of vibration-driven Energy Harvester, which used electromagnetic conversion. The proposed frequency tuning method uses a rotatable spring in order to adjust the spring constant. Through this tuning method, the resonant frequency of the Harvester can be manipulated simply by rotating the spring. The proposed tuning-based Energy Harvester has been successfully tuned to have a resonant frequency from 23 to 32 Hz. These test results agree with the ANSYS analysis presented. The experimental results demonstrated that the proposed Energy Harvester can generate a maximum power output of 60 μW with an acceleration of 0.5 g (1 g = 9.81 m/s2). When the proposed Harvester was attached to an automobile engine, a maximum open-circuit voltage of 1.78 Vpp was produced at 700 RPM.
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A Study on Frequency Tunable Vibration Energy Harvester
Journal of Sensor Science and Technology, 2014Co-Authors: Byung-chul Lee, Gwiy-sang ChungAbstract:Abstract The common vibration Energy Harvester effectively converts mechanical vibration to electric power at a specific resonance frequencythat must match the ambient excitation frequency. The resonance frequencies of Energy Harvesters are fixed during the design processand could not be changed after fabrication. In this paper, we proposed the new frequency tuning which uses the rotatable spring in orderto adjust the spring constants. By this tuning method, the resonance frequency of the system can simply be manipulated using springrotation. The proposed Energy Harvester has been successfully tuned to a resonance frequency between 23 and 32 Hz. The experimentalresults demonstrated that the proposed Energy Harvester could generate a maximum output power of 60 µW with an acceleration of 0.5 g(1 g=9.81 m/s 2 ), and that the resonance frequency of the Harvester was able to tune approximately 31.4%. When the proposed Harvesterwas attached to an automobile engine, the maximum open circuit voltage of 1.78 Vpp was produced at 700 rpm.Keywords: Frequency tuning, Energy harvesting, Vibration, FR-4 spring
Daniil Yurchenko - One of the best experts on this subject based on the ideXlab platform.
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Design, modeling and experiments of broadband tristable galloping piezoelectric Energy Harvester
Acta Mechanica Sinica, 2020Co-Authors: Junlei Wang, Linfeng Geng, Shengxi Zhou, Zhien Zhang, Zhihui Lai, Daniil YurchenkoAbstract:Galloping based piezoelectric Energy Harvester is a kind of micro-environmental Energy harvesting device based on flow-induced vibrations. A novel tristable galloping-based piezoelectric Energy Harvester is constructed by introducing a nonlinear magnetic force on the traditional galloping-based piezoelectric Energy Harvester. Based on Euler–Bernoulli beam theory and Kirchhoff’s law, the corresponding aero-electromechanical model is proposed and validated by a series of wind tunnel experiments. The parametric study is performed to analyse the response of the tristable galloping-based piezoelectric Energy Harvester. Numerical results show that comparing with the galloping-based piezoelectric Energy Harvester, the mechanism of the tristable galloping-based piezoelectric Energy Harvester is more complex. With the increase of a wind speed, the vibration of the bluff body passes through three branches: intra-well oscillations, chaotic oscillations, and inter-well oscillations. The threshold wind speed of the presented Harvester for efficiently harvesting Energy is 1.0 m/s, which is decreased by 33% compared with the galloping-based piezoelectric Energy Harvester. The maximum output power of the presented Harvester is 0.73 mW at 7.0 m/s wind speed, which is increased by 35.3%. Compared with the traditional galloping-based piezoelectric Energy Harvester, the presented tristable galloping-based piezoelectric Energy Harvester has a better Energy harvesting performance from flow-induced vibrations.
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high performance piezoelectric wind Energy Harvester with y shaped attachments
Energy Conversion and Management, 2019Co-Authors: Junlei Wang, Shengxi Zhou, Zhien Zhang, Daniil YurchenkoAbstract:Abstract In order to improve wind Energy harvesting performance, this paper proposes a novel high-performance piezoelectric wind Energy Harvester with Y-shaped attachments on the bluff body (GPEH-Y). When Y-shaped attachments are removed from the bluff body, the vortex-induced vibration piezoelectric Energy Harvester (VIVPEH) will be obtained. The Lattice-Boltzmann CFD method (LBM) used to analyze the vibration amplitude and frequency, confirms the transition from vortex induced vibration to galloping. The transition from vortex induced vibrations into galloping by adding Y-shaped attachments to the bluff body is further verified by experiments. A theoretical model of the GPEH-Y is presented to analyze its Energy harvesting performance. A set of the wind tunnel tests is conducted to validate the presented GPEH-Y. The performance of piezoelectric wind Energy Harvesters with or without Y-shaped attachments is specifically compared, taking into the fact that the proposed design allows a simple conversion from the VIVPEH to the GPEH layout.
Byung-chul Lee - One of the best experts on this subject based on the ideXlab platform.
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Frequency tuning design for vibration-driven electromagnetic Energy Harvester
IET Renewable Power Generation, 2015Co-Authors: Byung-chul Lee, Gwiy-sang ChungAbstract:The common resonant-based vibration Energy Harvester effectively converts mechanical vibration to electrical power when an ambient excitation frequency matches the specific resonant frequency of the device. The resonant frequencies of Energy Harvesters are generally fixed during the design process and cannot be changed after fabrication. Therefore frequency tuning technology that allows for operation in a wide frequency range is desirable for a vibration Energy Harvester. In this study, the authors proposed a novel frequency tuning design of vibration-driven Energy Harvester, which used electromagnetic conversion. The proposed frequency tuning method uses a rotatable spring in order to adjust the spring constant. Through this tuning method, the resonant frequency of the Harvester can be manipulated simply by rotating the spring. The proposed tuning-based Energy Harvester has been successfully tuned to have a resonant frequency from 23 to 32 Hz. These test results agree with the ANSYS analysis presented. The experimental results demonstrated that the proposed Energy Harvester can generate a maximum power output of 60 μW with an acceleration of 0.5 g (1 g = 9.81 m/s2). When the proposed Harvester was attached to an automobile engine, a maximum open-circuit voltage of 1.78 Vpp was produced at 700 RPM.
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A Study on Frequency Tunable Vibration Energy Harvester
Journal of Sensor Science and Technology, 2014Co-Authors: Byung-chul Lee, Gwiy-sang ChungAbstract:Abstract The common vibration Energy Harvester effectively converts mechanical vibration to electric power at a specific resonance frequencythat must match the ambient excitation frequency. The resonance frequencies of Energy Harvesters are fixed during the design processand could not be changed after fabrication. In this paper, we proposed the new frequency tuning which uses the rotatable spring in orderto adjust the spring constants. By this tuning method, the resonance frequency of the system can simply be manipulated using springrotation. The proposed Energy Harvester has been successfully tuned to a resonance frequency between 23 and 32 Hz. The experimentalresults demonstrated that the proposed Energy Harvester could generate a maximum output power of 60 µW with an acceleration of 0.5 g(1 g=9.81 m/s 2 ), and that the resonance frequency of the Harvester was able to tune approximately 31.4%. When the proposed Harvesterwas attached to an automobile engine, the maximum open circuit voltage of 1.78 Vpp was produced at 700 rpm.Keywords: Frequency tuning, Energy harvesting, Vibration, FR-4 spring
Yoonpyo Lee - One of the best experts on this subject based on the ideXlab platform.
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a tunable rotational Energy Harvester for low frequency vibration
Applied Physics Letters, 2011Co-Authors: Seonjun Jang, Inho Kim, Hyungjo Jung, Yoonpyo LeeAbstract:The tunable single-degree-of-freedom rotational Energy Harvester is proposed. The device is the combination of the rotational Energy Harvester and the suspended weight. Thus, it can harvest the electrical power from the translational base excitation associated with low frequency and large amplitude. Further, its natural frequency can be changeable by manipulating the size of the reel (i.e., geometrical tunability). The characteristics of the proposed device are investigated through numerical simulation and experimental test.
Junlei Wang - One of the best experts on this subject based on the ideXlab platform.
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Design, modeling and experiments of broadband tristable galloping piezoelectric Energy Harvester
Acta Mechanica Sinica, 2020Co-Authors: Junlei Wang, Linfeng Geng, Shengxi Zhou, Zhien Zhang, Zhihui Lai, Daniil YurchenkoAbstract:Galloping based piezoelectric Energy Harvester is a kind of micro-environmental Energy harvesting device based on flow-induced vibrations. A novel tristable galloping-based piezoelectric Energy Harvester is constructed by introducing a nonlinear magnetic force on the traditional galloping-based piezoelectric Energy Harvester. Based on Euler–Bernoulli beam theory and Kirchhoff’s law, the corresponding aero-electromechanical model is proposed and validated by a series of wind tunnel experiments. The parametric study is performed to analyse the response of the tristable galloping-based piezoelectric Energy Harvester. Numerical results show that comparing with the galloping-based piezoelectric Energy Harvester, the mechanism of the tristable galloping-based piezoelectric Energy Harvester is more complex. With the increase of a wind speed, the vibration of the bluff body passes through three branches: intra-well oscillations, chaotic oscillations, and inter-well oscillations. The threshold wind speed of the presented Harvester for efficiently harvesting Energy is 1.0 m/s, which is decreased by 33% compared with the galloping-based piezoelectric Energy Harvester. The maximum output power of the presented Harvester is 0.73 mW at 7.0 m/s wind speed, which is increased by 35.3%. Compared with the traditional galloping-based piezoelectric Energy Harvester, the presented tristable galloping-based piezoelectric Energy Harvester has a better Energy harvesting performance from flow-induced vibrations.
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high performance piezoelectric wind Energy Harvester with y shaped attachments
Energy Conversion and Management, 2019Co-Authors: Junlei Wang, Shengxi Zhou, Zhien Zhang, Daniil YurchenkoAbstract:Abstract In order to improve wind Energy harvesting performance, this paper proposes a novel high-performance piezoelectric wind Energy Harvester with Y-shaped attachments on the bluff body (GPEH-Y). When Y-shaped attachments are removed from the bluff body, the vortex-induced vibration piezoelectric Energy Harvester (VIVPEH) will be obtained. The Lattice-Boltzmann CFD method (LBM) used to analyze the vibration amplitude and frequency, confirms the transition from vortex induced vibration to galloping. The transition from vortex induced vibrations into galloping by adding Y-shaped attachments to the bluff body is further verified by experiments. A theoretical model of the GPEH-Y is presented to analyze its Energy harvesting performance. A set of the wind tunnel tests is conducted to validate the presented GPEH-Y. The performance of piezoelectric wind Energy Harvesters with or without Y-shaped attachments is specifically compared, taking into the fact that the proposed design allows a simple conversion from the VIVPEH to the GPEH layout.