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노형철(Hyungchul Noh),박경석(Kyoungsuk Park),손성만(Sungman Son) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, Automobile exhaust system has made Dual muffler concerning to the noise and vibration reduction. To reduce the noise and the vibration of the automobile, it is needed to consider the pulsation noise, air current noise, vibration of air pipe which generate the intake and exhaust noise of the automobile. Moreover, the discharge sound, intake sound, radiation sound, transmitted sound are occurred. To reduce this influence, the exhaust system volume are needed the bigger. Also it brings the engine performance down by decreasing the back pressure and temperature in the exhaust system. The experiments are carried out differently volume of exhaust system. In order to establish the optimized conditions design factors which are taking exhaust system volume, it show how the back pressure and the temperature of the exhaust system on the engine performance.
노형철(Hyungchul Noh),박경석(Kyoungsuk Park),최명진(Myungjin Choi),한창평(Changpyoung Han),변영호(Youngho Byun) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
While a great deal of automobile accidents are caused by the carelessness of drivers, a more careful study illustrates that another major cause for these accidents can be found in improper road conditions and poor transportation facilities. Visual distances is one of the important factors in the geometric design of roads. In particular, the visual distance for stopping is very important in the design of vertical and surface alignments. It is also vital in establishing control and operational methods for intersections which tack roads or traffic lights. Deceleration and the friction coefficients of tire and surface play an important role in calculating the visual distance. In other words, when the friction coefficient is smaller, the safety stop visual distance must be longer. In contrast, when the friction coefficient is larger, the design standard for visual distance becomes shorter. The road traffic safety authority has recently studied the stop friction coefficient and the results has highly different from the prices set by American Association of State Highway and Transportation Officials(AASHTO). In this research various various test automobiles are used separately to study speed, roads, and road surfaces. Then the results are analyzed and compared with similar tests and related tests conducted in the past.
노형철(Hyungchul Noh),박경석(Kyoungsuk Park),박세종(Sejong Park),변영호(Youngho Byun),한창평(Changpyung Han),손성만(Sungman Son) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
In design of muffler, Noise reduction is most important point in the past. By reason of this factor, study of muffler mainly used acoustic analysis for predictive modeling. but, recently muffler design factor, back pressure reduction and enhanced engine performance is more important than noise reduction. and developing process uses FEM and fluid analysis. but these process is not clearly defined the value for effective pressure.<br/> In this study, make experiment in muffler and semi-active muffler and analysis back pressure. This has made it possible to optimize muffler design, and defined design variable.
가솔린 자동차용 연료 개질기의 온도와 연료조건에 따른 개질특성에 관한 연구
이지혜(Jihye Lee),장주찬(Juchan Jang),노형철(Hyungchul Noh),서호철(Hocheol Suh),박경석(KyoungSuk Park) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
A reformate gas from hydrocarbon based fuel reformed consists of H₂, CO and CO₂. The purpose of this study is to reduce fuel consumption in gasoline automobiles for steam reforming. Steam reforming process needed high temperature and steam. In this paper, hydrogen reformer for using heat and steam of exhaust gas is investigated for reforming performance. The percentage of gasoline fuel addition was changed from 12.9~75.5 g/h and temperature varied 500~600 ℃. As a result, Hydrogen concentration was increased with the increase of fuel amount. Maximum hydrogen concentration is 8.24% in 75.5 g/h gasoline (20 duty %). Reaction temperature was higher than before the reaction. The component with a small amount of hydrocarbons which is smaller than gasoline was measured because hydrogen was created by re-synthesis after cracking a fuel in gasoline fuels.