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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.
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/>