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[가솔린엔진부문] 엔진 물통로 내부 벽면 스케일 축적이 LPG 엔진의 열적 내구성에 미치는 영향에 대한 연구
류택용(Taekyong Ryu),신승용(Seungyong Shin),최재권(Jaekwon Choi) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, the effects of scale formation in engine water jacket upon the thermal durability of engine itself and its component parts was studied. To understand the effect of quality of water, a full load engine endurance test for 50 hours was carried out with not-treated underground water.<br/> The followings were found through the tested engine inspection after the endurance test ; 1-2 nun thick scale formation in the engine water jacket, valve seat wear, piston top land sculling. piston pin Slick, and cylinder bore scuffmg in siamese area. In order to understand the causes of above test results, the heat rejection rate to coolant the metal surface temperature of combustion chamber, and oil and exhaust gas temperatures were measured and analyzed.<br/> The scale formed in the engine water jacket played a role as thermal insulator. The scale formed in the engine reduced the heat rejection rate to coolant and it caused to increase the metal surface temperature. The reduced heat rejection rate to coolant increased the heat rejection rate to oil and exhaust gas and increased the oil and exhaust gas temperature. Also, the reasons of valve seat wear piston top land sculling and cylinder bore scuffing and piston pin stick quantitatively analyzed in this paper.
[가솔린엔진부문] 가솔린 연료의 배기 밸브 카본 스틱킹 형성에 관한 연구
오대윤(Daeyoon Oh),이두순(Doososn Lee),최재권(Jaekwon Choi) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to understand and resolve the exhaust valve carbon sticking problem, the engine parameters effective on the phenomenon arc shO\\11 by bench test. Based on the results, a new test code which can evaluate the exhaust valve carbon sticking is developed. And by using the test code, gasoline properties, warm-up enrichment, and gasoline additives are shown. Finally, the detailed mechanism of the exhaust valve carbon sticking is clarified and solution to it is proposed
윤여원(Yoon Yeowon),윤길림(Yoon Gillim),최재권(Choi Jaekwon) 한국지반환경공학회 2007 한국지반환경공학회논문집 Vol.8 No.6
해안 연약지반 개량공사에 사용되는 모래는 대부분 다소간의 패각을 함유하게 된다. 본 연구에서는 패각 함유량이 패각질 모래의 액상화 저항에 미치는 영향을 연구하기 위하여 중량비에 의해 0%, 5%, 10%, 20%, 30%의 패각을 함유한 모래의 입도를 조성하고 건조퇴적 방법으로 상대밀도가 40%와 55%인 공시체를 성형하여 50kPa, 100kPa, 150kPa의 압밀유효연직응력으로 NGI형 직접단순전단시험기를 이용해서 반복단순전단시험을 수행하였다. 연구 결과, 압밀유효연직응력이 낮을 경우에는 상대밀도가 40%, 55% 모두 패각 함유량이 많아질수록 액상화강도가 크게 증가하는 경향을 보였다. 그러나 압밀유효연직응력이 높을 경우에는 상대밀도가 40%일 경우 약간 증가하는 경향을 얻었으나 상대밀도가 55%일 경우에는 거의 일정한 값으로 수렴하는 결과를 얻었다. 그리고 상대밀도에 관계없이 압밀유효연직응력이 증가하면 액상화 저항이 감소하는 경향을 보였다. 또한 같은 압밀유효연직응력과 패각 함유량에서 상대밀도가 높아질수록 액상화강도가 증가하는 것으로 나타났다. The sands which use for soil improvement of soft ground at coastal area contain more or less amount of shells. In this research the effects of shell contents on the liquefaction resistance of the shelly sand were studied. NGI cyclic simple shear tests were performed for the shell-sands with shell contents of 0%, 5%, 10%, 20%, 30% under the effective vertical stress of 50㎪, 100㎪ and 150㎪ for 40% and 55% of relative density, respectively. Cyclic simple shear test results showed that for the low effective vertical stress, the liquefaction resistance increased rapidly with increase of shell contents in both 40% and 55% relative density. On the other hand, for the high effective vertical stress, the liquefaction resistance increased slightly in 40% relative density and was almost same in 55% relative density. Liquefaction resistance decreased with increasing effective vertical stress for both 40% and 55% relative density. In the same effective vertical stress and shell contents, liquefaction resistance increased with the increase of relative density.
엔진 물통로 내부 벽면 스케일 축적이 LPG 엔진의 열적 내구성에 미치는 영향에 대한 연구
류택용(Taekyong Ryu),신승용(Seungyong Shin),최재권(Jaekwon Choi) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.3
In this paper, the effects of scale formation in engine water jacket upon the thermal durability of engine itself and its component parts were studied. To understand the effect of quality of water, a full load engine endurance test for 50 hours was carried out with not-treated underground water.<br/> The followings were found through the tested engine inspection after the endurance test; 1-2 mm thick scale formation in the engine water jacket, valve seat wear, piston top land scuffing, piston pin stick, and cylinder bore scuffing in siamese area, In order to understand the causes of above test results, the heat rejection rate to coolant, the metal surface temperature of combustion chamber, and the oil and exhaust gas temperatures were measured and analyzed.<br/> The scale formed in the engine water jacket played a role as thermal insulator. The scale formed in the engine reduced the heat rejection rate to coolant and it caused to increase the metal surface temperature. The reduced heat rejection rate to coolant increased the heat rejection rate to oil and exhaust gas and increased the oil and exhaust gas temperature, Also, the reasons of valve seat wear, piston top land scuffing and cylinder bore scuffing, and piston pin stick quantitatively analyzed in this paper.<br/>
가솔린엔진의 금속면온도 및 냉각수로의 전열 특성에 관한 실험적 연구
오창석(Changseok OH),유택용(Taekyong Ryu),신승용(Seungyong Shin),최재권(Jaekwon Choi) 한국자동차공학회 2001 한국 자동차공학회논문집 Vol.9 No.3
In recent applications, map controlled thermostat has been adapted to optimize engine cooling system and vehicle cooling system. First of all, this strategy is focused on improving fuel consumption rate and reducing emissions, especially unburned hydrocarbon. The object can be obtained through controlling engine metal temperature by varying engine coolant temperature with engine load and speed. To achieve this goal, it is necessary to understand the characteristics of engine metal temperature and heat rejection rate to coolant.<br/> From the results of tested engines, it is obvious that fuel consumption rate has more dominant effect on engine metal temperatures than the corresponding engine power does. Also, Re-Nu relation which shows heat rejection rate to coolant in function of air-fuel mixture and engine specifications has been studied. Also, the empirical Re-Nu relation at full loaded engine was developed.<br/> <br/>
가솔린엔진의 냉각계 유로 변경을 통한 금속면 온도 및 전열에 관한 실험적 연구
이재헌(Jaeheon Lee),류택용(Taekyong Ryu),신승용(Seungyong Shin),최재권(Jaekwon Choi) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.1
Metal surface temperatures around the combustion chamber in a gasoline engine directly affect thermal durability and performance of the engine. Metal surface temperatures are influenced by many cooling factors such as drilled water passage, deflector, combustion chamber wall thickness, pillar, and coolant flow pattern. The object of this study is to learn how the coolant passages and coolant flow pattern in an engine influence to the engine metal surface temperature at engine full load and speed. From the test result, it is suggested a plan to reinforce the engine stiffness and to reduce the thermal stress simultaneously. Also, approaches are introduced to reduce the thermal load on the engine by adjusting the discharging direction from the water pump and by optimizing the water transfer holes in the cylinder head gasket. These methods and the optimized engine cooling system, which were suggested in this paper, were adapted for an engine in progress to eliminate the exhaust valve seat wear.
엔진 및 차량냉각계의 냉각수유량 측정실험 및 계산방법에 관한 연구
오창석(Changseok Oh),유택용(Taekyong Ryu),이은현(Eunhyun Lee),최재권(Jaekwon Choi) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.6
In this study, the prediction method of coolant flow rates has been developed and applied to an engine and vehicle cooling system. The flow rate passing through each component of the system is very important parameter to evaluate the heat transfer process from the combustion gas to the coolant and the heat rejection process from the radiator/heater to the ambient air. However, the present study reveals that the measurement using the flowmeter fails to give practical flow rates due to its additive resistance. In contrast, the present method which uses the parellel and serial relationship of flow resistance proved to be a good tool to predict the real flow rates. It can be also used to design the cooling system in the incipient stage of engine/ vehicle development. The procedure was coded to the computer program so as to use it flexibly and, in the future, to expand it into an independent design tool of the whole cooling system including the heat release and rejection.<br/>
피스톤링의 회전운동이 오일소모에 미치는 영향 - 제2보- : 링갭의 위상각과 오일소모와의 관계 -
민병순(Byungsoon Min),김중수(Joongsoo Kim),오대윤(Daeyoon Oh),최재권(Jaekwon Choi),진준하(Joonha Jin) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.5
In order to understand the relationship between the phase angle of piston ring and oil consumption, the ring rotation and instantaneous oil consumption were measured at the same time. The ring rotation was measured by radio-tracer technique. The instantaneous oil consumption was measured by analyzing CO_2 concentration in exhaust gas. The use of hydrogen fuel not gasoline makes this possible because all of the carbon component in exhaust gas can be assumed to be produced from oil. As a result of experiment, it is known that the oil consumption varies periodically and a specific location of ring end gap was found at each peak of oil consumption. Therefore, it was found that the oil consumption was not constant even at the same operating conditions and this is because the relative locations of top and 2'nd ring end gap change arbitrarily.<br/> <br/>
이두순(Doosoon Lee),김원규(Wonku Kim),오대윤(Daeyoon Oh),최재권(Jaekwon Choi) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.7
We developed a new measuring equipment which makes it possible to perform on-line measurements with the merits of its simplicity and the time-saving characteristics. By using the newly developed measurement system, the amount of aeration is directly measured on several parameters, i. e., engine speed, oil quantity. oil deterioration, oil temperature and viscosity, etc. It showed that oil aeration is strongly related to the gas movements in crankcase and the residence time of circulating oil in oil pan. In addition, in order to clarify the mechanism of aeration and to quantify the degree of aeration, a modelling analysis to predict aeration was performed, and as a guiding parameter, Aeration Index was defined. Finally, the parameter was compared with the actual amount of aeration, and it was confirmed that they gave a good correlation with each other.<br/>