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[論文] Compliant Press-Fit Pin에 의한 접속기구에 관한 연구(II)
전병희(B. H. Jeon),안기순(K. S. Ann) 한국자동차공학회 1993 오토저널 Vol.15 No.1
In this research, important mechanical characteristics of Compliant Press-Fit Pin and PTH are studied through the analysis of deformation mechanisms of Press-Fit Pin and PTH by elastic-plastic finite element method. The direct data for the optimal design of pin was obtained without interfere with the criterion on insertion force and retention force. Also, the insertion force and retention force of new type pin were measured by precision type tensile testing machine and it revealed good agreement with analytical results.<br/> In conclusion. it is believed that above results will contribute satisfactorily to the practical design of Press-Fit Pin.
CFD를 이용한 모바일기기용 고분자전해질 연료전지 성능해석
김병희(B. H. Kim),최종필(J. P. Choi),강대철(D. C. Kang),전병희(B. H. Jeon) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
This paper presents the effects of different operating parameters on the performance of a proton exchange membrane (PEM) fuel cell by a three-dimensional computational fluid dynamics (CFD) model. The effects of different operating parameters on the performance of PEM fuel cell studied using pure hydrogen on the anode side and air on the cathode side. The various parameters are temperatures, pressures, humidification of the gas steams and various combinations of these parameters. In addition, geometrical and material parameters such as the gas diffusion layer (GDL) thickness and porosity as well as the ratio between the channel width and the land area were investigated.
김병희(B. H. KIM),전성건(S. K. JEON),남권선(K. S. NAM),김헌영(H. Y. KIM),전병희(B. H. JEON) 한국생산제조학회 2004 한국생산제조시스템학회 학술발표대회 논문집 Vol.2004 No.4
Ultrasonic machining is effective for machining of extreme hard and brittle materials, including glass, ceramic, carbide, graphite. The major machining principle involves the direct hammering as well as the impact of abrasive particles on the workpiece. Also, it involve cavitation erosion. The general workpiece is flat side. This study attempted micro hole machining of a curved surface of glass tube. Ultrasonic machining is fault of the slow machining speed. An experiment does and got 16 seconds validity machining time as increasing the processing speed. Moreover, entrance crack and sur face roughness was similar both machining speed is slow and fast. Several micro hole of glass tube machined using one micro tool, but tool wear is infinitesimal.
김병희(B. H. Kim),전성건(S. K. Jeon),김헌영(H. Y. Kim),전병희(B. H. Jeon) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Ultrasonic Machining process is an efficient and economical means of precision machining on glass<br/> and ceramic materials. However, the mechanics of the process with respect to crack initiation and<br/> propagation, and stress development in the ceramic workpiece subsurface are still not well understood.<br/> In this research, we investigate the basic mechanism of chemical assisted ultrasonic machining(CUSM)<br/> of glass through the experimental approach. For the purpose of this study, we designed and fabricated<br/> the desktop micro ultrasonic machine. The feed is controlled precisely by using the constant load<br/> control system. During the machining experiment, the effects of HF(hydrofluoric acid) characteristics<br/> and machining condition on the surface roughness and the material removal rate are measured and<br/> compared.