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RISS 인기검색어
- 검색키워드
- 저자 : Yuan Liqiang (검색결과 7 건)
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Experimental Investigation of Composite Steel Plate Deep Beam Infill Steel Frame
Liqiang Jiang,Hong Zheng,Yuan Liu,Xiaosa Yuan 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.3
Steel frame and shear wall infill steel frame are two commonly lateral load resisting systems used in building structures. Torealize the modulation of initial stiffness of steel structures, make it easily assembled and removed and prevent plastic hingesdeveloping in the frame columns and collapse of all structure, a new anti-seismic infill wall system, composite steel plate deepbeam (CDB), is introduced. The system uses steel plate deep beam with a precast reinforced concrete panel attached one side. This paper describes the experimental work related to the tests of CDB under cyclic loads. The experimental results of one puresteel frame (PF) and two composite steel plate deep beam infill steel frame (CDBF) with different span-height ratio aresummarized and discussed, the hysteretic loops were obtained. Based on the test results, effects of the CDB on the load capacity,ductility, hysteretic property and energy-dissipation of the pure steel frame were analyzed. The results show that the CDBenhances the initial stiffness and load capacity by a large margin, and the hysteretic loops are replete and the skeleton curveshave apparent stage of plastic flow, the ductility and energy dissipation capacity of the test specimens are enhanced. Lastly,regression analysis based on the tests data, and restoring force model can apply to elastoplastic response analysis of the CDBFsystems. Therefore, the deep beam can be used as the first defense line of earthquake-resistance, and the steel frame can beused as the second.
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Yuan, Decheng,Xue, Dayong,Ji, Liqiang The Korean Society for Integrative Biology 1997 Korean journal of biological sciences Vol.1 No.3
There exists a great need for biosystematics in China's mainland, especially because it is currently undergoing rapid changes. The present infrastructure for research and educateion was developed since the 1950s following the founding of the People's Republic of China in 1949. The total collection of insects in China's mainland now reaches over 13 million specimens, and about 190 specialists are engaged in biosystematic studies on insects. With these collections and expertise for research, China can offer biosystematic services on certain groups and function as the regional center both for referenced specimens and biosystematic information in East Asia.
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Feng, Gaohui,Yuan, Liqiang,Zhao, Zhengming,Ge, Junjie,Ye, Xiuxi,Lu, Ting The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
This paper focuses on an improvement in the transient performance of Boost converters when the load changes abruptly. This is achieved on the basis of the nature trajectory in Boost converters. Three key aspects of the transient performance are analyzed including the storage energy change law in the inductors and capacitors of converters during the transient process, the ideal minimum voltage deviation in the transient process, and the minimum voltage deviation control trajectory. The changing relationship curve between the voltage deviation and the recovery time is depicted through analysis and simulations when the load suddenly increases. In addition, the relationship curve between the current fluctuation and the recovery time is obtained when the load suddenly decreases. Considering the aspects of an increasing and decreasing load, this paper proposes the transient performance synthetic optimized trajectory and control laws. Through simulation and experimental results, the transient performances are compared with the other typical three control methods, and the ability of proposed synthetic trajectory and control law to achieve optimal transient performance is verified.
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Gaohui Feng,Liqiang Yuan,Zhengming Zhao,Junjie Ge,Xiuxi Ye,Ting Lu 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
This paper focuses on an improvement in the transient performance of Boost converters when the load changes abruptly. This is achieved on the basis of the nature trajectory in Boost converters. Three key aspects of the transient performance are analyzed including the storage energy change law in the inductors and capacitors of converters during the transient process, the ideal minimum voltage deviation in the transient process, and the minimum voltage deviation control trajectory. The changing relationship curve between the voltage deviation and the recovery time is depicted through analysis and simulations when the load suddenly increases. In addition, the relationship curve between the current fluctuation and the recovery time is obtained when the load suddenly decreases. Considering the aspects of an increasing and decreasing load, this paper proposes the transient performance synthetic optimized trajectory and control laws. Through simulation and experimental results, the transient performances are compared with the other typical three control methods, and the ability of proposed synthetic trajectory and control law to achieve optimal transient performance is verified.
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Tradeoff between the Output Voltage Deviation and Recovery Time of Boost Converters
Ge, Junjie,Yuan, Liqiang,Zhao, Zhengming,Lu, Ting,He, Fanbo,Feng, Gaohui The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.2
The time-optimal control for boost converters can achieve the minimum recovery time. However, their output voltage deviation is quite large. Since the minimum output voltage deviation and minimum recovery time cannot be obtained at the same time, a novel energy control is proposed to achieve a superior tradeoff between them in this paper. The peak value of the inductor current can be decreased as well. Its control parameter is easy to choose. When compared with the conventional control methods, the proposed control shows a better dynamic performance. Experimental results, which are in agreement with the theoretical analysis, are provided to verify the proposed control method.
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Tradeoff between the Output Voltage Deviation and Recovery Time of Boost Converters
Junjie Ge,Liqiang Yuan,Zhengming Zhao,Ting Lu,Fanbo He,Gaohui Feng 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.2
The time-optimal control for boost converters can achieve the minimum recovery time. However, their output voltage deviation is quite large. Since the minimum output voltage deviation and minimum recovery time cannot be obtained at the same time, a novel energy control is proposed to achieve a superior tradeoff between them in this paper. The peak value of the inductor current can be decreased as well. Its control parameter is easy to choose. When compared with the conventional control methods, the proposed control shows a better dynamic performance. Experimental results, which are in agreement with the theoretical analysis, are provided to verify the proposed control method.
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Implementation of a Stand-alone Photovoltaic Pumping System with Maximum Power Point Tracking
Zhao Zhengming,Chen Kunlun,Yuan Liqiang 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
Photovoltaic (PV) pumping systems with maximum power point tracking (MPPT) technique aims at obtaining the highest possible power to the pump under various insolation and temperature, thus overcomes the mismatch between the photovoltaic panel and the pumping load. A simple method of tracking the maximum power points and forcing the system to operate close to these points is presented in this paper. The MC68HC908GP32 micro control unit (MCU) is employed to implement the proposed MPPT controller. Experimental results will also show the performances of the photovoltaic pumping system with the MPPT technique.<br/>
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