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      저자 : Erlei, Shi (검색결과 2 건)
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        The research on static and dynamic mechanical properties of concrete under the environment of sulfate ion and chlorine ion

        Liangxue Nie,Jinyu Xu,Erlei Bai 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.20 No.2

        The Hydraulically driven test system and 100 mm split Hopkinson pressure bar(SHPB) test device were employed to research the quasi-static and dynamic mechanical properties of concrete specimens which has been immersed for 60 days in sodium sulfate (group S1) and sodium chloride (group S2) solution, the evolution of their mass during corrosive period was explored at the same time, and the mechanism of performances lost was analyzed from the microscopic level by using scanning electron microscope. Results of the experimental indicated that: their law of mass both presents the trend of continuous rising during corrosive period, and it increases rapidly on the early days, the mass growth of group S1 and group S2 in first 7 days are 76.78% and 82.82% of their total increment respectively; during the corrosive period, the quasi-static compressive strength of specimens in two groups are significantly decreased, both of which present the trend of increase first and then decrease, the maximum growth rate of group S1 and group S2 are 7.52% and 12.71% respectively, but they are only 76.23% and 82.84% of specimens which under normal environment (group N) on day 60; after immersed for 60 days, there were different decrease to dynamic compressive strength and specific energy absorption, and so as their strain rate sensitivities. So the high salinity environment has a significant effect of weaken the quasi-static and dynamic mechanical performance of concrete.

      • DC Voltage Balancing and Current Sharing Control of Parallel Multiple Modules Static Var Generator Based on CPS-SPWM

        Cai, Wei,Huang, Yanyan,Fangyuan, Zhou,Qiu, Wenjun,Wang, Caixiao,Wu, Qiang,Erlei, Shi,Wen, Tao The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.1

        For extending the power and improving the performance of SVG, a topology with several parallel plugging convertor modules is obtained, which has no common DC bus. In respect that the parameter difference among converters, reactive power of total output sharing has to be resolved. In this article, mathematics model with DQ analytic transformation is analyzed. Based on double close-loop decoupling control, and direct current control, a reactive power balance current sharing method is proposed. By using CPS-SPWM, the current harmonic of SVG is reduced, which is indicated by simulation result. Further, in order to apply the method to project application, a 2Mvar platform with a double FPGA-DSP controller broad is carried out. The simulation and practical performance of SVG are given. The validity and feasibility of the method is demonstrated by the results.

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