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- 저자 : Liu Yuanpeng (검색결과 4 건)
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Xuesong Feng,Yuanpeng Jie,Haidong Liu,Xun Sun,Bin Xu 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.6
Utilizing a computer-aided simulation approach, this work studies the impacts of different inter-stop transport distances on the transport efficiency evaluated by the transport time cost intensity of a typically composed Chinese freight train hauled by representative types of locomotives in view of different target speeds. It is found that the decelerated decrease of the transport time cost intensity with improving the target speed is much traded off by decreasing the stop-spacing especially below approximately 20.00 km. Moreover, the decrease of the inter-stop transport distance especially shorter than about 20.00 km obviously increases the transport time cost intensity in an accelerated way for the same target speed. Such a trend is more apparent when the target speed becomes relatively high. Therefore, it is suggested that the inter-stop transport distance of a freight train ought to be over 20.00 km for relatively high transport efficiency.
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DC-Link Voltage Balance Control in Three-phase Four-wire Active Power Filters
Yu Wang,Yuanpeng Guan,Yunxiang Xie,Xiang Liu 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.5
The three-phase four-wire shunt active power filter (APF) is an effective method to solve the harmonic problem in three-phase four-wire power systems. In addition, it has two possible topologies, a four-leg inverter and a three-leg inverter with a split-capacitor. There are some studies investigating DC-link voltage control in three-phase four-wire APFs. However, when compared to the four-leg inverter topology, maintaining the balance between the DC-link upper and lower capacitor voltages becomes a unique problem in the three-leg inverter with a split-capacitor topology, and previous studies seldom pay attention to this fact. In this paper, the influence of the balance between the two DC-link voltages on the compensation performance, and the influence of the voltage balance controller on the compensation performance, are analyzed. To achieve the balance between the two DC-link capacitor voltages, and to avoid the adverse effect the voltage balance controller has on the APF compensation performance, a new DC-link voltage balance control strategy for the three-phase four-wire split-capacitor APF is proposed. Representative simulation and experimental results are presented to verify the analysis and the proposed DC-link voltage balance control strategy.
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DC-Link Voltage Balance Control in Three-phase Four-wire Active Power Filters
Wang, Yu,Guan, Yuanpeng,Xie, Yunxiang,Liu, Xiang The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.5
The three-phase four-wire shunt active power filter (APF) is an effective method to solve the harmonic problem in three-phase four-wire power systems. In addition, it has two possible topologies, a four-leg inverter and a three-leg inverter with a split-capacitor. There are some studies investigating DC-link voltage control in three-phase four-wire APFs. However, when compared to the four-leg inverter topology, maintaining the balance between the DC-link upper and lower capacitor voltages becomes a unique problem in the three-leg inverter with a split-capacitor topology, and previous studies seldom pay attention to this fact. In this paper, the influence of the balance between the two DC-link voltages on the compensation performance, and the influence of the voltage balance controller on the compensation performance, are analyzed. To achieve the balance between the two DC-link capacitor voltages, and to avoid the adverse effect the voltage balance controller has on the APF compensation performance, a new DC-link voltage balance control strategy for the three-phase four-wire split-capacitor APF is proposed. Representative simulation and experimental results are presented to verify the analysis and the proposed DC-link voltage balance control strategy.
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New families of cage-like structures based on Goldberg polyhedra with non-isolated pentagons
Rezaee Javan Anooshe,Liu Yuanpeng,Xie Yi Min 한국CDE학회 2023 Journal of computational design and engineering Vol.10 No.2
A Goldberg polyhedron is a convex polyhedron made of hexagons and pentagons that have icosahedral rotational symmetry. Goldberg polyhedra have appeared frequently in art, architecture, and engineering. Some carbon fullerenes, inorganic cages, viruses, and proteins in nature exhibit the fundamental shapes of Goldberg polyhedra. According to Euler’s polyhedron formula, an icosahedral Goldberg polyhedron always has exactly 12 pentagons. In Goldberg polyhedra, all pentagons are surrounded by hexagons only—this is known as the isolated pentagon rule (IPR). This study systematically developed new families of cage-like structures derived from the initial topology of Goldberg polyhedra but with the 12 pentagons fused in five different arrangements and different densities of hexagonal faces. These families might be of great significance in biology and chemistry, where some non-IPR fullerenes have been created recently with chemical reactivity and properties markedly different from IPR fullerenes. Furthermore, this study has conducted an optimization for multiple objectives and constraints, such as equal edge length, equal area, planarity, and spherical shape. The optimized configurations are highly desirable for architectural applications, where a structure with a small number of different edge lengths and planar faces may significantly reduce the fabrication cost and enable the construction of surfaces with flat panels.
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