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RISS 인기검색어
- 검색키워드
- 저자 : Junquan Chen (검색결과 3 건)
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Evaluation of a pyramid die extrusion for a hollow aluminum profile using FE simulation
Liang Chen,Guoqun Zhao,Junquan Yu,Wendong Zhang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.5
The pyramid die extrusion for a hollow aluminum profile was analyzed to investigate the potential of such innovative dies. For thispurpose, the pyramid and conventional porthole dies were respectively designed for a given hollow aluminum profile. And the extrusionprocess was comprehensively studied by performing different types of finite element simulation, such as the analysis of steady state,transient state and billet skin tracking. The effects of pyramid angle on the evaluation parameters of extrusion, such as extrusion load,material flow, exit temperature, length of transverse weld, quality of longitudinal weld, back end defect and die stress were overall analyzedand compared with the conventional porthole die. Through this study, the advantages and shortcomings of pyramid die were wellconcluded, which should be important information for die designers and makers.
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Qin Li,Junquan Zhou,Yanhui Chen,Xiaofeng Xia,Maolin Bo,Qihuang Deng,Yefeng Feng 한국고분자학회 2020 Macromolecular Research Vol.28 No.13
Polymer/conductor composite dielectric materials have a high dielectric constant. In recent years, composite dielectrics have become a study hotspot in highdensity energy storage capacitors. However, high dielectric loss and high electrical conductivity make the application of the composite materials very limited. In order to obtain composite materials with high dielectric constant, low dielectric loss and low conductivity, we added the insulating boron nitride (BN) filler into polymer/Cr2AlC composites. As a conductive filler, Cr2AlC ternary-layered-compound (MAX) ceramic has an interface polarization with the polymer matrix, thereby increasing the dielectric constant of the composites. The insulating BN has a very low electrical conductivity, which can effectively reduce the electrical conductivity and dielectric loss of the composites. Compared with the binary polymer/Cr2AlC composite materials, the ternary polymer/Cr2AlC/BN composite materials can achieve the low dielectric loss and low conductivity as well as properly-lowered dielectric constant. The ternary composite material filled with 10 wt% Cr2AlC and 2 wt% BN has a dielectric constant of about 30, a dielectric loss of about 0.7 and a conductivity of about 4.6×10- 7 S m-1 at 100 Hz. In this work, high-performance composite dielectrics were prepared through good cooperation between conductive and insulating ceramic fillers, which might provide an idea for design of promising energy storage capacitors.
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Yapeng Jiang,Junquan Chen,Xuan Teng,Dong Wang Korean Magnetics Society 2018 Journal of Magnetics Vol.23 No.4
This paper presents an improved circuit model for predicting additional copper loss caused by circulating current effect. Based on basic circuit equations and winding topology, this model takes account of both slot and end leakage inductance which are separately extracted by 2-D and 3-D finite element method. Several simplified windings are wounded in a stator to validate the accuracy of the proposed model. The results shows that this model has high accuracy and the maximum error of loss factor is about 1.5 %. In addition, it is found that the circulating current loss factor will decrease as the end winding length grows up or winding temperature increases.
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