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1
Content available Optimal design and numerical simulation on fish-like flexible hydrofoil propeller
Xue G., Liu Y., Zhang M., Zhang W., Zhang J., Luo H., Jia R.
Polish Maritime Research
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2016
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nr 4
59--66
EN
Hydrofoil is widely used in underwater vehicle for the excellent hydrodynamic characteristics. Currently, researches are mostly about the rigid hydrofoil while the flexible hydrofoil, like the caudal fin, has not been studied adequately. In this paper, the fish was regarded as the bionic object. Then the kinematics model to describe the fish swimming was put forward. A fin-peduncle propulsion mechanism was designed based on the kinematics model to achieve the similar sine curve swimming model. The propulsion mechanism was optimized by Matlab to reduc the deviation between the output curve of the fin-peduncle propulsion mechanism and the ideal motion trajectory. Moreover, the motion phase angles among flexible articulations are optimized to reduce fluid resistance and improve propulsive efficiency. Finally, the fish-like hydrofoil oscillation is simulated by fluid-solid coupling method based on the Fluent. It was shown that the optimized flexible fish-like oscillation could generate the motion that follows the similar law of sine. The propulsive efficiency of oscillating hydrofoil propeller is much higher than that of the screw propeller, and the flexible oscillation has higher propulsive efficiency than the rigid oscillation without obvious fluid resistance increase.
2
Content available Experimental and simulative study on accumulator function in the process of wave energy conversion
Zhang W., Liu Y., Luo H., Xue G., Zhang J.
Polish Maritime Research
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2016
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nr 3
79--85
EN
In this paper, a floating-buoy wave energy converter using hydrostatic transmission system is studied. The entire work progress of wave energy power generation device is introduced, and the hydraulic transmission principles are emphasized through the simulation to verify the feasibility of design principle of hydraulic transmission system. The mathematical model of the accumulator is established and applied in the AMEsim simulation. The simulation results show that the accumulator plays an important role in the wave power hydraulic transmission system and that the correct configuration of accumulator parameters can improve the rapidity and stability of the system work. Experimental results are compared with the simulation results to validate the correctness of the simulation results. This would provide a valuable reference to the optimal design of wave power generation.
3
Content available remote Orthogonal Experiment Design Algorithm of a Distribution Network Reconfiguration
Yanli L., Dexiang Z., Hong S., Xue G.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 4
120-122
EN
According to the operation characteristics of the power distribution network with tree structure and the reconfiguration power distribution network, this paper proposes the orthogonal experiment design algorithm of power distribution network reconfiguration by mending the switch of the ring net presented by the orthogonal table.
PL
W artykule przedstawiono propozycję algorytmu rekonfiguracji sieci dystrybucji energii. W metodzie zastosowano projektowanie ortogonalnego eksperymentu. Wykonanie operacji polega na przełączaniu (łączeniu) odpowiednich łączników w pierścieniu sieci, która zapisana jest w tablicy ortogonalnej.
4
Content available remote Optimal Power Assignment and Coordinated Control Strategy for a Small-Scale Residential DC Microgrid
Xue G., Zhang Y., Zhu D.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 12a
226-232
EN
This paper focuses on control and operation of a small-scale residential dc microgrid supplied by photovoltaic array (PVA), fuel cell (FC) and super-capacitor (SC). The control scheme aims to realize the optimal power allocation, protect FC from fuel starvation, and stabilize dc bus voltage. The dc microgrid can operate in both islanded and grid-connected mode. To make the system work properly during islanding operation, power control and energy management strategy are proposed. When system is grid-connected, power balance is achieved by controlling the threephase voltage source rectifier (VSR). The effectiveness of the proposed control method is verified through simulations.
PL
W artykule skupiono się na zagadnieniu sterowania mikro-siecią DC małej skali w zastosowaniu mieszkaniowym, zasilanej z systemu złożonego z paneli fotowoltaicznych (ang. photovoltaic array), ogniw paliwowych (ang. fuel cell) oraz super-kondensatora (ang. super-capacitor), z naciskiem na optymalizację rozpływu mocy, zapewnienie dopływu paliwa dla ogniw paliwowych i stabilizację napięcia DC. Przeprowadzono analizę symulacyjną algorytmu, gdzie rozważono przypadki pracy wyspowej i podłączenia do sieci energetycznej.
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