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Study on the measureto improve the arcstabilization in smaller current welding for the variable polarity GTAW powersource 被引量:2
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作者 张广军 耿正 +1 位作者 吴林 殷树言 《China Welding》 EI CAS 2000年第1期78-82,共5页
The variable polarity power source which incorporates a constant current power and a secondary inverter does not need special apparatus for stabilizing arc. The pulse for stabilizing arc is created by the circuit stru... The variable polarity power source which incorporates a constant current power and a secondary inverter does not need special apparatus for stabilizing arc. The pulse for stabilizing arc is created by the circuit structure itself. The paper analyzes the principle of acquiring the pulse, provides the better method to improve the arc stabilization under smaller welding current. Test shows the arc is highly stable , and the process has no high frequency electromagnetic interference, which is suitable for automatic welding case. 展开更多
关键词 variable polarity power source stabilizing arc aluminum GTAW
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Novel Methodology for Designing Frequency Selective Surfaces with Miniaturized Cells
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作者 Guo-Hui Yang Wan-Lu Li +2 位作者 Tong Zhang Qun Wu Xue-Mai Gu 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2013年第2期1-6,共6页
Miniaturization of Frequency Selective Surface's ( FSS's) size is significant for its application in the limited space. In this paper, a novel methodology for designing low-profile FSS is discussed, and a corr... Miniaturization of Frequency Selective Surface's ( FSS's) size is significant for its application in the limited space. In this paper, a novel methodology for designing low-profile FSS is discussed, and a corresponding multi-layer structure with lumped elements for band-pass response is presented. Based on the equivalent circuit theory,the inductive designed center layer is firstly discussed. Then different numbers of additional capacitive designed layers are added and their performances are presented. Finally,the lumped elements are added both between adjacent layers and between adjacent cells of the additional layers so that the miniaturization performance can be further improved. The simulations for each structure in waves of different polarizations and incident angles are conducted,and the results are presented,which demonstrate the claimed characteristics of the proposed structure. 展开更多
关键词 FSS MINIATURIZATION MULTI-LAYER polarization stability
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