The Experts below are selected from a list of 285 Experts worldwide ranked by ideXlab platform
Kimihiko Nakano - One of the best experts on this subject based on the ideXlab platform.
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a tri stable energy harvester in Rotational Motion modeling theoretical analyses and experiments
Journal of Sound and Vibration, 2020Co-Authors: Xutao Mei, Shengxi Zhou, Zhichun Yang, Tsutomu Kaizuka, Kimihiko NakanoAbstract:Abstract This paper originally investigates the performance of a tri-stable piezoelectric energy harvester (TPEH) in Rotational Motion, aiming to solve the challenging issue of power supply for wireless sensors. Based on the Lagrange equation, the related theoretical model with the consideration of the effect of Rotational Motion is originally derived to describe its dynamic response and energy harvesting performance. In addition, the perturbation method is used to theoretically describe the TPEH for the oscillations around both non-zero and zero stable equilibrium positions. The numerical simulations and case studies are carried out to investigate the influence of the K c coefficient on the dynamic response of the TPEH. More importantly, the corresponding experiments under different constant Rotational speeds are performed to validate the energy harvesting enhancement of the presented TPEH and the accuracy of its theoretical model. It is experimentally verified that the TPEH can efficiently harvest energy in the wide Rotational speed range (240–440 rpm), and the proposed theoretical model is suitable for the TPEH. Overall, the energy harvesting enhancement of the TPEH in Rotational Motion are verified, and the accuracy of the presented theoretical model is also experimentally validated.
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the benefits of an asymmetric tri stable energy harvester in low frequency Rotational Motion
Applied Physics Express, 2019Co-Authors: Xutao Mei, Shengxi Zhou, Zhichun Yang, Tsutomu Kaizuka, Kimihiko NakanoAbstract:This letter investigates the benefits of an asymmetric tri-stable energy harvester in low-frequency Rotational Motion. A theoretical model framework is presented, which considers the effect of the Rotational Motion, to describe the dynamic characteristics and output voltage of the harvester. More importantly, the asymmetric tri-stable energy harvester is experimentally verified to be better than the symmetric one under various Rotational speeds. The former exhibits a wide working Rotational speed range of 140–460 rpm. The weight component of tip mass produces a periodic harmonic exciting force due to Rotational Motion, which can be designed to enhance energy harvesting.
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The Centrifugal Softening Effect of an Inverse Nonlinear Energy Harvester in Low-frequency Rotational Motion for Enhancing Performance
2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS), 2019Co-Authors: Xutao Mei, Shengxi Zhou, Tsutomu Kaizuka, Bo Yang, Kimihiko NakanoAbstract:Recently, various nonlinear energy harvesters, which is aimed to provide the power supply for wireless sensors, are designed to harvest Rotational energy. However, there are few studies for energy harvesting from Rotational Motion when the Rotational speed is less than 120 rpm (2 Hz). In this paper, an inverse nonlinear piezoelectric energy harvester (PEH) is proposed for enhancing performance in low-frequency Rotational Motion via the centrifugal softening effect. In addition, according to Lagrange equation, the related theoretical model is derived. Furthermore, the experiments between the forward and inverse configurations in Rotational Motion are conducted under the Rotational speeds ranging from 60 rpm to 160 rpm. The experimental results demonstrate that in low-frequency Rotational Motion the inverse PEH exhibits outstanding performance with the RMS voltage as high as 5 V, which is enough for powering some wireless sensors. Overall, the centrifugal softening effect is verified to be an effect method for energy harvesting in low-frequency Rotational Motion.
Xutao Mei - One of the best experts on this subject based on the ideXlab platform.
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a tri stable energy harvester in Rotational Motion modeling theoretical analyses and experiments
Journal of Sound and Vibration, 2020Co-Authors: Xutao Mei, Shengxi Zhou, Zhichun Yang, Tsutomu Kaizuka, Kimihiko NakanoAbstract:Abstract This paper originally investigates the performance of a tri-stable piezoelectric energy harvester (TPEH) in Rotational Motion, aiming to solve the challenging issue of power supply for wireless sensors. Based on the Lagrange equation, the related theoretical model with the consideration of the effect of Rotational Motion is originally derived to describe its dynamic response and energy harvesting performance. In addition, the perturbation method is used to theoretically describe the TPEH for the oscillations around both non-zero and zero stable equilibrium positions. The numerical simulations and case studies are carried out to investigate the influence of the K c coefficient on the dynamic response of the TPEH. More importantly, the corresponding experiments under different constant Rotational speeds are performed to validate the energy harvesting enhancement of the presented TPEH and the accuracy of its theoretical model. It is experimentally verified that the TPEH can efficiently harvest energy in the wide Rotational speed range (240–440 rpm), and the proposed theoretical model is suitable for the TPEH. Overall, the energy harvesting enhancement of the TPEH in Rotational Motion are verified, and the accuracy of the presented theoretical model is also experimentally validated.
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the benefits of an asymmetric tri stable energy harvester in low frequency Rotational Motion
Applied Physics Express, 2019Co-Authors: Xutao Mei, Shengxi Zhou, Zhichun Yang, Tsutomu Kaizuka, Kimihiko NakanoAbstract:This letter investigates the benefits of an asymmetric tri-stable energy harvester in low-frequency Rotational Motion. A theoretical model framework is presented, which considers the effect of the Rotational Motion, to describe the dynamic characteristics and output voltage of the harvester. More importantly, the asymmetric tri-stable energy harvester is experimentally verified to be better than the symmetric one under various Rotational speeds. The former exhibits a wide working Rotational speed range of 140–460 rpm. The weight component of tip mass produces a periodic harmonic exciting force due to Rotational Motion, which can be designed to enhance energy harvesting.
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The Centrifugal Softening Effect of an Inverse Nonlinear Energy Harvester in Low-frequency Rotational Motion for Enhancing Performance
2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS), 2019Co-Authors: Xutao Mei, Shengxi Zhou, Tsutomu Kaizuka, Bo Yang, Kimihiko NakanoAbstract:Recently, various nonlinear energy harvesters, which is aimed to provide the power supply for wireless sensors, are designed to harvest Rotational energy. However, there are few studies for energy harvesting from Rotational Motion when the Rotational speed is less than 120 rpm (2 Hz). In this paper, an inverse nonlinear piezoelectric energy harvester (PEH) is proposed for enhancing performance in low-frequency Rotational Motion via the centrifugal softening effect. In addition, according to Lagrange equation, the related theoretical model is derived. Furthermore, the experiments between the forward and inverse configurations in Rotational Motion are conducted under the Rotational speeds ranging from 60 rpm to 160 rpm. The experimental results demonstrate that in low-frequency Rotational Motion the inverse PEH exhibits outstanding performance with the RMS voltage as high as 5 V, which is enough for powering some wireless sensors. Overall, the centrifugal softening effect is verified to be an effect method for energy harvesting in low-frequency Rotational Motion.
Jonathan P Rothstein - One of the best experts on this subject based on the ideXlab platform.
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translational and Rotational Motion of disk shaped marangoni surfers
Physics of Fluids, 2019Co-Authors: Samrat Sur, Hassan Masoud, Jonathan P RothsteinAbstract:In this paper, we study the Marangoni propulsion of a neutrally buoyant disk-shaped object at the air-water interface. Self-propulsion was achieved by coating the back of the disk with either soap or isopropyl alcohol in order to generate and then maintain a surface tension gradient across the surfer. As the propulsion strength and the resulting disk velocity were increased, a transition from a straight-line translational Motion to a Rotational Motion was observed. Although spinning had been observed before for asymmetric objects, these are the first observations of spinning of a geometrically axisymmetric Marangoni surfer. Particle tracking and particle image velocimetry measurements were used to interrogate the resulting flow field and understand the origin of the Rotational Motion of the disk. These measurements showed that as the Reynolds number was increased, interfacial vortices attached to sides of the disk were formed and intensified. Beyond a critical Reynolds number of Re > 120, a vortex was observed to shed resulting in an unbalanced torque on the disk that caused it to rotate. The interaction between the disk and the confining wall of the Petri dish was also studied. Upon approaching the bounding wall, a transition from straight-line Motion to Rotational Motion was observed at significantly lower Reynolds numbers than on an unconfined interface. Interfacial curvature was found to either enhance or eliminate Rotational Motion depending on whether the curvature was repulsive (concave) or attractive (convex).
Zhichun Yang - One of the best experts on this subject based on the ideXlab platform.
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a tri stable energy harvester in Rotational Motion modeling theoretical analyses and experiments
Journal of Sound and Vibration, 2020Co-Authors: Xutao Mei, Shengxi Zhou, Zhichun Yang, Tsutomu Kaizuka, Kimihiko NakanoAbstract:Abstract This paper originally investigates the performance of a tri-stable piezoelectric energy harvester (TPEH) in Rotational Motion, aiming to solve the challenging issue of power supply for wireless sensors. Based on the Lagrange equation, the related theoretical model with the consideration of the effect of Rotational Motion is originally derived to describe its dynamic response and energy harvesting performance. In addition, the perturbation method is used to theoretically describe the TPEH for the oscillations around both non-zero and zero stable equilibrium positions. The numerical simulations and case studies are carried out to investigate the influence of the K c coefficient on the dynamic response of the TPEH. More importantly, the corresponding experiments under different constant Rotational speeds are performed to validate the energy harvesting enhancement of the presented TPEH and the accuracy of its theoretical model. It is experimentally verified that the TPEH can efficiently harvest energy in the wide Rotational speed range (240–440 rpm), and the proposed theoretical model is suitable for the TPEH. Overall, the energy harvesting enhancement of the TPEH in Rotational Motion are verified, and the accuracy of the presented theoretical model is also experimentally validated.
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the benefits of an asymmetric tri stable energy harvester in low frequency Rotational Motion
Applied Physics Express, 2019Co-Authors: Xutao Mei, Shengxi Zhou, Zhichun Yang, Tsutomu Kaizuka, Kimihiko NakanoAbstract:This letter investigates the benefits of an asymmetric tri-stable energy harvester in low-frequency Rotational Motion. A theoretical model framework is presented, which considers the effect of the Rotational Motion, to describe the dynamic characteristics and output voltage of the harvester. More importantly, the asymmetric tri-stable energy harvester is experimentally verified to be better than the symmetric one under various Rotational speeds. The former exhibits a wide working Rotational speed range of 140–460 rpm. The weight component of tip mass produces a periodic harmonic exciting force due to Rotational Motion, which can be designed to enhance energy harvesting.
Awad Elgohary - One of the best experts on this subject based on the ideXlab platform.
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the control of a permanent Rotational Motion and equilibrium position of a spacecraft
International Journal of Non-linear Mechanics, 2000Co-Authors: Awad ElgoharyAbstract:Abstract This article has adopted an analytical method to obtain a non-linear control law to reach the exponential asymptotic stablity of the permanent Rotational Motion of a spacecraft. The control moments achieving this Rotational Motion are obtained. The control moments to establish exponential asymptotic stablity of the mentioned Motion are obtained as non-linear functions of the phase coordinates of the spacecraft. The general solution of the equations of perturbed Motion is derived. Furthermore, analysis and numerical simulation study of this solution are presented. For numerical examples the time needed for control is calculated. An equilibrium position of the spacecraft is proved to be exponentially asymptotically stable as a special case of the above-studied problem.
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on the stability of an equilibrium position and Rotational Motion of a gyrostat
Mechanics Research Communications, 1997Co-Authors: Awad ElgoharyAbstract:Abstract This article is devoted to study the compulsory stability of equilibrium position and Rotational Motion of a rigid body containing fluid with the help of three rotors carried on the body. The control moments on the rotors using that condition which impose the stabilization of equilibrium position of the rigid body and Rotational Motion are obtained.
