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서호철(Hocheol Suh),박세종(Sejong Park),박경석(Kyoungsuk Park),전완호(Wanho Jeon),조장형(Janghyung Cho) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, there are some problem of flow noise in a muffler of the exhaust system. This noise is generated from the flow fluctuation inside the muffler. In this paper, we want to establish a analysis process of this flow noise. The flow field was calculated by a commercial CFD code - SC/Tetra. Flow noise was calculated by Ffowcs-Williams and Hawking's equation. From the results, we can find dominant noise source and noise generation mechanisms.
연료전지자동차용 수소센서의 수소 반응에 대한 특성 연구
서호철(Hocheol Suh),장성욱(Sungwook Jang),조용준(Yongjun Cho),박경석(Kyungsuk Park) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In the present study, the performance of a combustion type micro chip hydrogen sensor for fuel cell electric vehicle is optimized by investigating the thermal and output characteristics of detection element and the compensation element, while the micro chip hydrogen sensor reacts to hydrogen. The result of the numerical analysis and the experimental result show a good agreement with each other. Based on the result of the present study we may conclude. The temperature variation of the sensor for the reaction with hydrogen is approximately 50 ℃. at this point, output voltage of sensor is about 45㎷.
배기열 회수장치를 이용한 엔진의 웜-업 성능에 관한 연구
서호철(Hocheol Suh),김규준(Kyujun Kim),장성욱(Sungwook Jang),박경석(Kyungsuk Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
엔진이 웜업이 되기 전까지는 윤활유 등의 온도가 정상작동하기 이전이기 때문에 점도가 높은 상태이다. 그로 인해 차량의 연비는 엔진이 웜업되기 전까지는 낮은 연비를 가질 수밖에 없다. 이 문제를 해결하는 방법의 하나로 엔진 구동계의 웝업을 촉진시키기 위하여 배기가스의 열을 이용하는 것이 있다. 배기계에 열교환기를 두고 배기가스가 가진 열에너지를 흡수하여 엔진의 웝업을 빨리 시킴으로 엔진의 효율을 높이고 연비의 향상을 도모하는 것이다. 배기열의 열에너지 회수에 있어 성능변수가 되는 것이 배기가스 유량, 냉각수 유량, 배기가스 온도, 냉각수 온도, 배기가스 배압, 냉각수 배압 등이 있다. 배기가스 온도, 냉각수 온도의 경우에는 임의로 결정할 수 있는 변수가 아니다. 위 변수들은 엔진의 상황에 따라서 유기적으로 변동되는 사항이기 때문에 임의로 결정할 수 없기 때문에 열교환기 형상의 변경을 통해 배기가스와 냉각수의 배압을 변수로 하여 배압에 따른 유량(유속)의 변화를 유도하여 열교환기의 성능을 확인하였다. 배기열 회수장치의 성능을 평가하는 것은 두 가지 방법을 통하여 확인할 수 있다. 첫 번째는 엔진초기시동부터 웜업 완료시간까지의 시간을 측정하여 웜업시간의 단축을 보는 방법이다. 두 번째는 엔진 정속시 배기가스 열 교환량과 냉각수 열 교환량을 확인하여 열 교환 성능을 확인하는 방법이다. 성능평가는 상용가솔린엔진 을 이용하여 진행하였으며 앞서 설명한 두 가지 방법을 통하여 배기열 회수장치의 성능을 평가하였다. 배기가스의 유량, 온도를 제어하기 위하여 idle, 2000rpm과 같이 정속으로 시험을 진행하였다.
연료전지 자동차용 수소센서의 히터 조건에 따른 열전달 특성에 관한 연구
서호철(Hocheol Suh),박경석(Kyoungsuk Park) 한국자동차공학회 2013 한국 자동차공학회논문집 Vol.21 No.1
In recent years, development of energy conversion systems using hydrogen as an energy source has been accelerated globally. Even though hydrogen is an environment-friendly energy source, safety and effectiveness issues in storage, transportation, and usage of hydrogen should be clearly resolved in every application. Therefore, sensors for detecting hydrogen leakage, especially for fuel cell electric vehicles, should be designed to have much higher resolution and accuracy in comparison with conventional gas sensors. In this study, we conducted to determine the design parameters for the semiconductor hydrogen sensor with optimized sensing conditions under the thermal distribution characteristic and thermal transfer characteristic. The heat generation study on power supply voltage was studied for correlation analysis of thermal energy according to the power supply voltage variation from 1.0 voltage to 10.0 voltage every 0.5 voltage. And we studied for the temperature coefficient of resistance with hydrogen sensor.
배기열 회수장치 적용에 따른 SI 엔진의 웜업 성능에 미치는 영향
박경석(Kyounsuk Park),서호철(Hocheol Suh),박선홍(Sunhong Park),김인태(Intae Kim),장성욱(Sungwook Jang) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.6
The effect of exhaust heat recovery system can be evaluated by two well known method. First method is to measure the time duration from engine start under cold coolant temperature till coolant get warmed. By this methodology coolant warming duration can be index of warm-up effect. Second method is to analyze heat balance of the engine during warm-up phase under steady engine operation so that wasted energy by losses such as cooling and exhaust can be index of warm-up effect. This study focused on evaluation of warming-up effect by both methodology above mentioned using 2L SI engine under from idle to 2000rpm steady condition. Results, idle operation showed low heat recovery efficiency but under higher engine speed condition, remarkable heat recovery efficiency improvement was observed. In 2000rpm steady condition, warm-up duration of engine is decreased by exhaust heat recovery system.
강영규(Younggyu Kang),서호철(Hocheol Suh),최세훈(Sehoon Choi),권정호(Jeongho Kwon),황경정(Kyoungjeong Hwang) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
It is one of the important design assessment items to evaluate the fatigue life for the exhaust system of automobile. For this purpose, It is necessary to describe reliable load spectrum expected in the real operation of automobile. A study of the development procedure of driving load spectrum for the exhaust system of automobile. And the analysis of welded part was also made to obtain the local strain spectrum on the site where the fatigue damages are anticipated. These results are applicable to analyze the fatigue life and to perform the fatigue test for the exhaust system of automobiles.
박세종(Sejong Park),서호철(Hocheol Suh) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.1
The exhaust system of automobile is faced with random or spectrum types of fatigue loads during usage life and so needs to be closely estimated for quality and performance to have enough certainty on design endurance life during preliminary design process. Structural operation conditions, operation load history, property of material and manufacturing process etc. should be considered by performing experiment approach. Using the software program for predicting fatigue life quickly and exactly in preliminary design stage saves plenty of time and cost generated by fatigue tests. In this paper, fatigue life prediction was performed on the basis of fatigue analysis using MSC/FATIGUE and load data from field test and the life of development items was estimated and compared through the results.
박세종(Sejong Park),박경석(Kyungsuk Park),서호철(Hocheol Suh) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The exhaust system of automobile is faced with random or spectrum types of fatigue loads during usage life and so needs to be closely estimated for quality and performance to have enough certainty on design endurance life during preliminary design process. Structural operation conditions, operation load history, property of material and manufacturing process etc. should be considered by performing experiment approach. Using the software program for predicting fatigue life quickly and exactly in preliminary design stage saves plenty of time and cost generated by fatigue tests. In this paper, fatigue life prediction was performed on the basis of fatigue analysis using MSC/FATIGUE and load data from field test and the life of development items was estimated and compared through the results.