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이중분사식 수소기관 연소실내 가스의 순간열전달계수의 측정
위신환,김윤영,이종태,Wei, Shin-Whan,Kim, Yun-Young,Lee, Jong-Tai 한국수소및신에너지학회 2001 한국수소 및 신에너지학회논문집 Vol.12 No.4
To clear the differences of heat transfer coefficient of in-cylinder gas with fuel properties, the transient heat transfer coefficient of hydrogen gas is investigated by using the hydrogen fueled engine. The measured results were also compared with those of gasoline engine and several empirical equations. Transient heat transfer coefficients were determined by measurements of unsteady heat flux and instantaneous wall temperature in the cylinder head. As the main results, it is shown that transient heat transfer coefficients have remarkable differences according to fuel properties, and it's value for hydrogen engine is twice higher than that of gasoline engine. It means that equation of heat transfer coefficient that the effect of fuel properties is considered sufficiently, is needed to analyze or simulate the gas engine performance.
자동변속기 제어기(TCU)의 수명 해석을 위한 가속 시험법 개발
위신환(Shinhwan Wei),김형민(Hyungmin Kim),김성준(Sungjun Kim),강희열(Huiyul Kang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to assess the reliability of the auto-transmission control unit for automobiles, accelerated life test model and procedure are developed. By using this method, failure mechanism and life distribution are analyzed. The main results are as follows; ⅰ) the main failure mechanism is degradation failure that is, junction destruction of a semiconductor resin by high temperature. ⅱ) the life distribution of the auto-transmission control unit is fitted well to Weibull life distribution and the accelerated life model of that is fitted well to Arrhenius model. ⅲ) at the result of the life distribution, accelerated life test method is developed, and test time for life assessment will be shortened by 5,000 hours by this test method.
위신환(Shin Whan Wei),김윤영(Yun Young Kim),김홍준(Hong Jun Kim),이종태(Jong Tai Lee) 한국수소및신에너지학회 2001 한국수소 및 신에너지학회논문집 Vol.12 No.2
To measure of thermal loading in the combustion chamber of hydrogen engine with dual injection, instantaneous wall-surface temperature and unsteady heat flux of the cylinder head are measured and analyzed. The maximum wall surface temperature is shown in direct injection region which has large heat supplied. Partial and spatial temperatures have slight deviation in transient region of injection, though injection method change suddenly. All of thermal characteristics such as instantaneous temperature, temperature swing and heat flux of hydrogen engine with dual injection are remarkably higher than those of gasoline engine. It means necessity of additional countermeasure of thermal loading.