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차량 동력학과 컴퓨터 시뮬레이션을 통한 교통사고분석 사례 연구
한창평(Changpyoung Han),박경석(Kyeongsuk Park),오재건(Jaegeon Oh) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
For the purpose of objective and scientific inspection, traffic accidents should be appraised and inspected by righteous material evidences, computer simulation, and studies such as automobile engineering, traveling and collision accident dynamics, road and traffic engineering.<br/> In this treatise, I display the results of studying cases withthe reasons of traffic accidents by analyzing and studying automobile kinetics, real traffic accidents and the results of in scientific and objective ways.
실차 실험을 통한 제동순시간에 의한 타이어-노면마찰계수에 관한 연구
한창평(Changpyoung Han),박경석(Kyoungsuk Park),최명진(Myungjin Choi),이종상(jong sang Lee),신운규(Un gyu Shin) Korean Society for Precision Engineering 2007 한국정밀공학회지 Vol.24 No.7
In this paper, the transient brake time was studied on the van type vehicle with accelerometer. Experiments were carried out on the asphalt(new and polished), unpacked road{earth and gravel) and on wet or dry road conditions. The transient brake time is not effected bzy the vehicle speed. The transient brake time is about 0.41~0.43second on the asphalt road surface and the error range is within 0.1~0.16second. For the asphalt road condition, the transient brake time is not effected by both new asphalt road surface and the polished asphalt road surface. With compared by dry and wet road surface condition, the transient brake time of wet condition is longer than dry road condition and compared with unpacked road condition and packed road condition, unpacked road condition is shorter than packed road condition. It is considered that the transient brake time is effected by the road surface fraction coefficient. In other words, the transients brake time increases as friction coefficient decreases.
PIV에 의한 반능동형 머플러의 내부유동장에 대한 실험 및 시뮬레이션
김동현(Donghyun Kim),박경석(Kyoungsuk Park),박세종(Sejong Park),허형석(Hyungseok Heo),한창평(Changpyoung Han),손성만(Sungman Son) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
Recently, the performance development of the exhaust system ofa car is very important. The most important part of parts that constructing the exhaust system of a car is a muffler. The muffler reducing the exhaust noise from the engine influence on the engine performance directly. The inner parts of the muffler construct with the baffle and perforated pipes and so on. In the recent study, the study to design the semi-active muffler sensing the exhaust gas pressure controlling the back pressure variably with a EVV progress activity. So that the inner parts of the muffler show the complicated turbulent flow phenomena because of pulsatile flow from the engine and the structural properties and so on. The qualitative and quantitative analysis about the turbulent flow phenomena of the inner parts of the muffler is required gradually.<br/> In this study, to analysis the flow field of the inner parts of the muffler, analysis results with the PIV measurement to be able to analysis the variable change of the time and the space. And experimental results compare with the simulation by computer. Therefore, try to show the design variables to need to design the inner parts of a muffler of a car.
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.