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Kan Z.,Yanshan University | Guo Z.,Yanshan University | Zhang C.,Yanshan University | Meng X.,Beijing Satellite Manufacturing Factory
Proceedings - 2014 International Power Electronics and Application Conference and Exposition, IEEE PEAC 2014 | Year: 2014

As the distributed generators are connected together through inverter interface in the microgrid, the control of the control of the interface inverter has an important influence on the operating performance of microgrid. In the paper, the study focuses on the control of the interfaced inverter, when microgrid operates in the islanded mode. In order to make the microgrid property similar to the utility grid, the ripe control scheme of the utility grid was introduced into the interfaced inverter control; the improvement on the classic droop control was made according to the nature of the low-voltage distribution line. The influence of unequal inverters distribution line impedance on the inverter output power is analyzed in detail, the variable virtual impedance has been proposed. Finally, simulation and experiment results are presented to verify the effectiveness of the proposed control scheme. © 2014 IEEE. Source


Lu Z.,Beijing University of Technology | Wang L.,Beijing University of Technology | Chen S.,Beijing University of Technology | Xue Z.,Beijing Satellite Manufacturing Factory | And 2 more authors.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2012

Variable polarity plasma arc welding process is an important method for welding aluminum alloy. Experimental results show that in addition to current and welding speed, gas flow rate, shrinkage of tungsten and the height of the nozzle are very important parameters which influence weld characteristics. The surface Gauss heat source and the cylinder heat source were selected to simulate the welding temperature field. Through a lot of experiments, the effect of main process parameters on variable polarity plasma arc welding was analyzed. By finite element analysis method, the relation between the heat source model and practical process parameters was established, and through linear regression analysis method mathematical formula was set up. Source


Mei P.,Beihang University | Qu W.,Beihang University | Xue Z.,Beijing Satellite Manufacturing Factory | Zhuang H.,Beihang University
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2015

A large area soldering technology on connecting LD10 aluminum alloy saddle and 1Cr18Ni9Ti stainless steel tube has been researched to solve the hard bonding problem of evaporation. The effects of solder adding method and soldering temperature on the equity of soldering joints have been investigated. The microstructures of joint are analyzed. ANSYS software was used to simulate heat transfer performance of evaporator and analyze the effect of different degrees of soldering defects on heat transfer performance of evaporator. A complete set of the soldering production process of evaporation has been designed finally. ©, 2015, Harbin Institute of Technology. All right reserved. Source


Zhong Y.C.,North China Institute of Aerospace Engineering | Han W.Z.,North China Institute of Aerospace Engineering | Liu Y.,Beijing Satellite Manufacturing Factory | Guo C.,North China Institute of Aerospace Engineering
Advanced Materials Research | Year: 2014

Existing aerospace manufacturing mode is difficult to adapt to the development of industrialization of space transformation in face of the increasing space missions. Then it causes demand for aerospace manufacturing mode transformation. This article first analyzes the present status and transformative driving factor of aerospace manufacturing mode. On the basis of TRIZ theory, we apply the theory of technology evolution in overall space manufacturing mode analysis. Then we look into each specific issues of manufacturing mode and explore the method to solve the problem according to the substance--field analyzing method. After that, integrate all income approaches and seek for target mode which adapts to the transformation of aerospace manufacturing. Finally, the target pattern’s characters are analyzed in terms of the maturity of aerospace products and production process. © (2014) Trans Tech Publications, Switzerland. Source


Ye H.-L.,Beijing University of Technology | Zhao C.-H.,Beijing University of Technology | Hu T.,Beijing University of Technology | Xiao Y.-N.,Beijing Satellite Manufacturing Factory
Beijing Gongye Daxue Xuebao/Journal of Beijing University of Technology | Year: 2015

The bending process of the single tape spring was simulated based on ABAQUS software. The variations of critical moment, unfolding moment, and maximum strain energy in the bending process were investigated, and the effects of different radius angles of section and length on driving capability of the simple tape spring was studied by using these parameters. Results show that the driving capability and resisting disturbance capacity grow with the increase of radius angle of section in the bending process of the single tape spring. On the other hand, these capabilities decrease with increasing length of the single tape spring. The research has a certain reference value for improving the kinematic accuracy and reliability of deployable structures. ©, 2015, Beijing University of Technology. All right reserved. Source

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