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오제훈,이대길,이수정,이종수,Oh, Je-Hoon,Lee, Dai-Gil,Lee, Su-Jeong,Lee, Jong-Soo 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.6
The finite element analysis for the tubular alumina liner which was shrink-fitted into a heat treated high speed steel (HSS) sleeve and subjected to high inner pressure and high temperature was performed. The parameters for the analysis were the interference between the alumina and the HSS, the temperature, the inner pressure, the coefficient of friction between the alumina and the HSS, and the taper at the sleeve ends. From the analysis, it was found that the tensile hoop stresses were decreased when the end parts of the HSS sleeve were tapered and the tensile stresses were decreased as the coefficient of friction between the alumina and the HSS was decreased. Also it was found that the alumina might be used as the structural liner for high pressure and high temperature when it was shrink-fitted into a heat treated HSS sleeve.
오제훈,이대길,O, Je-Hun,Lee, Dae-Gil 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.11
During the curing process of thick glass/epoxy laminates, a substantial amount of temperature lag and overshoot at the center of the laminates is usually experienced due to the large thickness and low thermal conductivity of the glass/epoxy composites. Also, it takes a longer time for full and uniform consolidation. In this work, temperature, degree of cure and consolidation of a 20 mm thick unidirectional glass/epoxy laminate were investigated using an experiment and a 3-dimentional numerical analysis. From the experimental and numerical results, it was found that the experimentally obtained temperature profile agreed well with the numerical one, and the cure cycle recommended by the prepreg manufacturer should be modified to prevent a temperature overshoot and to obtain full consolidation.
횡방향 하중을 받는 일방향 탄소섬유/에폭시 복합재료의 미시역학 해석
오제훈(Je Hoon Oh),진교국(Kyo Kook Jin),하성규(Sung Kyu Ha) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The micromechanical approach was used to investigate the interfacial behavior of a unidirectional composite under transverse loading. Representative volume elements (RVE) for the analysis were composed of regular fiber arrays (square and hexagonal arrays). The finite element analysis was performed to evaluate the effective material properties of a carbon/epoxy composite and to analyze the normal, tangential and shear strains at the interface. The microstructural fiber arrangement would have a great influence on interfacial strain distributions while it little affects the effective material properties. The RVE with random fiber arrays will be considered in the future work.
불평형 전원전압을 보상하는 3상3선식 직렬형 능동전력필터에 관한 연구
오제훈(Jaehoon Oh),김영석(Youngseok Kim),한윤석(Yoonseok Han),원충연(Chungyuen Won),최세완(Sewan Choi) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
In this paper, a 3phase-3wire series active power filter compensating current harmonics and unbalanced source voltages is presented. The system is composed of series active power filter and shunt passive filters that are tuned 5th and 7th harmonics In this system, series active power filter improves harmonic compensation characteristics of the shunt passive filters and compensates the unbalanced source voltages<br/> In the proposed algorithm, compensation voltage for harmonic reduction is calculated by a performance function, and compensation voltage for the unbalanced source voltage is calculated in based on the synchronous reference frame<br/> Some results obtained from the experimental model using the proposed method are presented to demonstrate and confirm its validity.