The Experts below are selected from a list of 136602 Experts worldwide ranked by ideXlab platform
Yu-jen Wang - One of the best experts on this subject based on the ideXlab platform.
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Natural Frequency self tuning energy harvester using a circular halbach array magnetic disk
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Chung De Chen, Yu-jen Wang, Cheng-kuo Sung, Chien LiAbstract:A novel Natural Frequency self-tuning energy harvester is presented, which utilizes the presence of the nonlinearity model and the well-weighted swing disk to maximize the power output and the Frequency bandwidth for a wheel rotating at any speed. Kinetic energy harvesters are Frequency selective, meaning that they have high power transmission efficiency only when they are excited at their Natural Frequency. The well-weighted swing disk with nonlinear effects can render the energy harvester more broadband, that is, it has a more steady power generation at various wheel speeds than the ill-weighted swing disk has. We integrate magnets in a novel circular Halbach array and coils into the design to augment the magnetic strength on one side of the array where the coils are placed. Therefore, the gradient of the average magnetic flux density for the circular Halbach array disk is larger than that of the multipolar magnetic disk. The dynamic models with electromechanical couplings have been established and are ...
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Natural Frequency self-tuning energy harvester using a circular Halbach array magnetic disk
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Yu-jen Wang, Chung De Chen, Cheng-kuo Sung, Chien LiAbstract:A novel Natural Frequency self-tuning energy harvester is presented, which utilizes the presence of the nonlinearity model and the well-weighted swing disk to maximize the power output and the Frequency bandwidth for a wheel rotating at any speed. Kinetic energy harvesters are Frequency selective, meaning that they have high power transmission efficiency only when they are excited at their Natural Frequency. The well-weighted swing disk with nonlinear effects can render the energy harvester more broadband, that is, it has a more steady power generation at various wheel speeds than the ill-weighted swing disk has. We integrate magnets in a novel circular Halbach array and coils into the design to augment the magnetic strength on one side of the array where the coils are placed. Therefore, the gradient of the average magnetic flux density for the circular Halbach array disk is larger than that of the multipolar magnetic disk. The dynamic models with electromechanical couplings have been established and are analyzed. In the experiments, the power output of the prototype at an optimum external resistance was approximately 300-550 μW at about 200-500 rpm and precisely matches the numerical results. © The Author(s) 2012.
Chien Li - One of the best experts on this subject based on the ideXlab platform.
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Natural Frequency self tuning energy harvester using a circular halbach array magnetic disk
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Chung De Chen, Yu-jen Wang, Cheng-kuo Sung, Chien LiAbstract:A novel Natural Frequency self-tuning energy harvester is presented, which utilizes the presence of the nonlinearity model and the well-weighted swing disk to maximize the power output and the Frequency bandwidth for a wheel rotating at any speed. Kinetic energy harvesters are Frequency selective, meaning that they have high power transmission efficiency only when they are excited at their Natural Frequency. The well-weighted swing disk with nonlinear effects can render the energy harvester more broadband, that is, it has a more steady power generation at various wheel speeds than the ill-weighted swing disk has. We integrate magnets in a novel circular Halbach array and coils into the design to augment the magnetic strength on one side of the array where the coils are placed. Therefore, the gradient of the average magnetic flux density for the circular Halbach array disk is larger than that of the multipolar magnetic disk. The dynamic models with electromechanical couplings have been established and are ...
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Natural Frequency self-tuning energy harvester using a circular Halbach array magnetic disk
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Yu-jen Wang, Chung De Chen, Cheng-kuo Sung, Chien LiAbstract:A novel Natural Frequency self-tuning energy harvester is presented, which utilizes the presence of the nonlinearity model and the well-weighted swing disk to maximize the power output and the Frequency bandwidth for a wheel rotating at any speed. Kinetic energy harvesters are Frequency selective, meaning that they have high power transmission efficiency only when they are excited at their Natural Frequency. The well-weighted swing disk with nonlinear effects can render the energy harvester more broadband, that is, it has a more steady power generation at various wheel speeds than the ill-weighted swing disk has. We integrate magnets in a novel circular Halbach array and coils into the design to augment the magnetic strength on one side of the array where the coils are placed. Therefore, the gradient of the average magnetic flux density for the circular Halbach array disk is larger than that of the multipolar magnetic disk. The dynamic models with electromechanical couplings have been established and are analyzed. In the experiments, the power output of the prototype at an optimum external resistance was approximately 300-550 μW at about 200-500 rpm and precisely matches the numerical results. © The Author(s) 2012.
Guobing Song - One of the best experts on this subject based on the ideXlab platform.
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a fault location method for vsc hvdc transmission lines based on Natural Frequency of current
International Journal of Electrical Power & Energy Systems, 2014Co-Authors: Guobing SongAbstract:Abstract This paper presents a novel method for locating fault on VSC-HVDC transmission line using one terminal current data. The proposed method is developed based on the Natural Frequency of distributed parameter line model. In the presence of the large shunt capacitor at both terminals of the VSC-HVDC line, the high Frequency traveling wave is approximately totally reflected at the terminals. It is found that the value of Natural Frequency of VSC-HVDC transmission line is only related to fault distance and wave speed. Using this characteristic, a single-end fault location method is developed. The Natural Frequency can be obtained by the PRONY algorithm. Compared with traveling wave method, this approach can use any section of the in-fault data to locate fault, without having to capture the instant at which wave-front arrives, which requires higher sampling rate. A short data window is sufficient for extracting Natural Frequency accurately in practice. The proposed method is verified using the Frequency-dependent line model in EMTDC. The simulations have demonstrated validity, rapidity and accuracy of the proposed fault location algorithm.
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Natural Frequency based protection and fault location for VSC-HVDC transmission lines
2011 International Conference on Advanced Power System Automation and Protection, 2011Co-Authors: Guobing Song, Jiale Suonan, Guang LiAbstract:With excellent priorities, Voltage Source Converter based HVDC (VSC-HVDC) will be the promising offset of HVDC transmission technology. This paper presents a protection and fault location method for VSC-HVDC transmission lines using one terminal current data. The proposed method is based on the Natural Frequency from the reflection process of traveling wave on a distributed parameters transmission line. As the presence of the large shunt capacitor on both terminals of the VSC-HVDC lines, the high Frequency traveling wave is close to total reflection on the terminals. Therefore, the value of Natural Frequency of VSC-HVDC transmission lines is only related to fault distance and travelling wave speed, and the magnitude of Natural Frequency signal is related to the fault resistance. According to these characteristic, a single-end protection and fault location method is proposed. Compared with traveling wave method, the proposed Natural Frequency method is more simple and reliable. It does not need to detect accurate wave-front arriving instant with high sampling Frequency. The proposed method is verified using the Frequency-dependent line model in EMTDC. The simulations have shown that this method is valid and is capable of locating the faults occurring on VSC-HVDC transmission lines quickly and accurately.
Cheng-kuo Sung - One of the best experts on this subject based on the ideXlab platform.
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Natural Frequency self tuning energy harvester using a circular halbach array magnetic disk
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Chung De Chen, Yu-jen Wang, Cheng-kuo Sung, Chien LiAbstract:A novel Natural Frequency self-tuning energy harvester is presented, which utilizes the presence of the nonlinearity model and the well-weighted swing disk to maximize the power output and the Frequency bandwidth for a wheel rotating at any speed. Kinetic energy harvesters are Frequency selective, meaning that they have high power transmission efficiency only when they are excited at their Natural Frequency. The well-weighted swing disk with nonlinear effects can render the energy harvester more broadband, that is, it has a more steady power generation at various wheel speeds than the ill-weighted swing disk has. We integrate magnets in a novel circular Halbach array and coils into the design to augment the magnetic strength on one side of the array where the coils are placed. Therefore, the gradient of the average magnetic flux density for the circular Halbach array disk is larger than that of the multipolar magnetic disk. The dynamic models with electromechanical couplings have been established and are ...
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Natural Frequency self-tuning energy harvester using a circular Halbach array magnetic disk
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Yu-jen Wang, Chung De Chen, Cheng-kuo Sung, Chien LiAbstract:A novel Natural Frequency self-tuning energy harvester is presented, which utilizes the presence of the nonlinearity model and the well-weighted swing disk to maximize the power output and the Frequency bandwidth for a wheel rotating at any speed. Kinetic energy harvesters are Frequency selective, meaning that they have high power transmission efficiency only when they are excited at their Natural Frequency. The well-weighted swing disk with nonlinear effects can render the energy harvester more broadband, that is, it has a more steady power generation at various wheel speeds than the ill-weighted swing disk has. We integrate magnets in a novel circular Halbach array and coils into the design to augment the magnetic strength on one side of the array where the coils are placed. Therefore, the gradient of the average magnetic flux density for the circular Halbach array disk is larger than that of the multipolar magnetic disk. The dynamic models with electromechanical couplings have been established and are analyzed. In the experiments, the power output of the prototype at an optimum external resistance was approximately 300-550 μW at about 200-500 rpm and precisely matches the numerical results. © The Author(s) 2012.
Chung De Chen - One of the best experts on this subject based on the ideXlab platform.
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Natural Frequency self tuning energy harvester using a circular halbach array magnetic disk
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Chung De Chen, Yu-jen Wang, Cheng-kuo Sung, Chien LiAbstract:A novel Natural Frequency self-tuning energy harvester is presented, which utilizes the presence of the nonlinearity model and the well-weighted swing disk to maximize the power output and the Frequency bandwidth for a wheel rotating at any speed. Kinetic energy harvesters are Frequency selective, meaning that they have high power transmission efficiency only when they are excited at their Natural Frequency. The well-weighted swing disk with nonlinear effects can render the energy harvester more broadband, that is, it has a more steady power generation at various wheel speeds than the ill-weighted swing disk has. We integrate magnets in a novel circular Halbach array and coils into the design to augment the magnetic strength on one side of the array where the coils are placed. Therefore, the gradient of the average magnetic flux density for the circular Halbach array disk is larger than that of the multipolar magnetic disk. The dynamic models with electromechanical couplings have been established and are ...
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Natural Frequency self-tuning energy harvester using a circular Halbach array magnetic disk
Journal of Intelligent Material Systems and Structures, 2012Co-Authors: Yu-jen Wang, Chung De Chen, Cheng-kuo Sung, Chien LiAbstract:A novel Natural Frequency self-tuning energy harvester is presented, which utilizes the presence of the nonlinearity model and the well-weighted swing disk to maximize the power output and the Frequency bandwidth for a wheel rotating at any speed. Kinetic energy harvesters are Frequency selective, meaning that they have high power transmission efficiency only when they are excited at their Natural Frequency. The well-weighted swing disk with nonlinear effects can render the energy harvester more broadband, that is, it has a more steady power generation at various wheel speeds than the ill-weighted swing disk has. We integrate magnets in a novel circular Halbach array and coils into the design to augment the magnetic strength on one side of the array where the coils are placed. Therefore, the gradient of the average magnetic flux density for the circular Halbach array disk is larger than that of the multipolar magnetic disk. The dynamic models with electromechanical couplings have been established and are analyzed. In the experiments, the power output of the prototype at an optimum external resistance was approximately 300-550 μW at about 200-500 rpm and precisely matches the numerical results. © The Author(s) 2012.
