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전해방전 가공 시 방전 피크의 제어를 통한 유리의 미세 가공성 향상에 관한 연구
장인배(I. B. Chang),김남혁(N. H. Kim),김대용(D. Y. Kim),김병희(B. H. Kim),김헌영(H. Y. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Electrochemical discharge machining is a very recent technique for non-conducting materials such as<br/> ceramics and glasses. ECDM is conducted in the NaOH solution and the cathode electrode is separated from<br/> the solution by H2 gas bubble. Then the discharge is appeared and the non-conductive material is removed by<br/> spark and some chemical reactions. In the ECDM technology, the H2 bubble control is the most important<br/> factor to stabilize the discharging condition. In this paper, we proposed the discharge peak monitoring/<br/> discharging duty feedback algorithms for the discharge stabilization and the feasibility of this algorithm is<br/> verified by various pattern machining in the constant preload conditions for the cathode electrode.
[구조강도] 알루미늄 초경량 차체 부재의 충격해석 및 설계
김헌영(H.Y.Kim),김상범(S.B.Kim),김진국(J.K.Kim),허승진(S.J.Heo),양승국(S.K.Yang) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
Aluminum Intensive Vehicle reduces the weight of automotive body for about 30 percents than conventional one and it has much more energy absorbing capability.<br/> In this paper, an effective impact energy absorbing member is designed and then comparatively analyzed with conventional automotive body in the respect of impact energy absorbing capability. In the long run, the method to optimize a design of impact energy absorbing member on AIV and the hybrid model which can be used on early design step is suggested.
김헌영(H.Y.Kim),강기봉(K.B.Kang),신윤재(Y.J.Shin),천정현(H.Cheon) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
The deployment process of fully folded airbag is analyzed by using commercial finite element program, PAM-SAFE. Folding methods are presented for flat driver side airbag and 3-dimensional passenger side airbag. 'Initial metric' is used to fold 3-dimensionaJ passenger side airbag before deployment analysis. The pressure waveform obtained from simulation are compared to the test results adopting 125mm-30ms criteria. The results of simulation can be applied to the design of airbag module.<br/>