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정성필(Sungpil Jung),전갑진(Kabjin Jun),이수호(Suho Lee),우준성(Junseong Woo),박태원(Taewon Park),윤재호(Jaeho Yoon) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is very difficult to estimate the braking performance of a vehicle because brake system includes many parts such as a booster, a master cylinder, a valve and so forth. To calculate the braking characteristics such as braking force through the real vehicle test requires much time and cost. Therefore, the development of the way to estimate the braking performance of a vehicle with computational methods is needed. In this paper, a program which can analyze the whole braking capabilities of a vehicle is presented. Since all input and output data are composed of the Microsoft Excel format, it is easy to manage design data and found the data base. It is considered that the braking characteristics against the variation of booster vacuum pressure are changed when a vehicle is under braking. Furthermore, the additional postprocessor not only makes the graph presentation of the result data but also generates the Excel result files for the report.
정성필(Sungpil Jung),박태원(Taewon Park) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.3
In this paper, the optimization design module for the brake system of a vehicle is developed. As using this module, design variables, that minimize an object function and satisfy nonlinear constraint conditions, can be found easily. Before an optimization is operated, Plackett-Burman design, one of the factorial design methods, is used to choose the design variables which affect a response function significantly. Using the response surface analysis, second order recursive model function, which informs a relation between design variables and response function, is estimated. In order to verify the reliability of the model function, analysis of variances(ANOVA) table is used. The value of design variables which minimize the model function and satisfy the constraint conditions is predicted through Sequential Quadratic-Programming (SQP) method. As applying the above procedure to a real vehicle simulation model and comparing the values of object functions of a current and optimized system, the optimization results are verified.
차량 공공도로 주행 특성을 적용한 타이어 연비 측정 방안에 대한 연구
조준희(Junhee Jo),정성필(Sungpil Jung),박재현(Jaehyen Park) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
At the moment when interest in tire fuel economy grows naturally due to economic fluctuations, national regulations are being formed due to constraints due to limited use of limited fossil fuels and social attention to environmental problems. As a result, the tire energy consumption efficiency indicator system has been established. This system displays the two performance characteristics of the fuel economy and safety of the tire. The lower the rotational resistance of the tire, the better the fuel economy. The higher the wet road surface braking force, It is characterized by excellent. However, the current measurement of the rotational resistance of the tire efficiency rating system is based on only the straight running, and it is considered that the method is a method that does not take into consideration the rotation section traveling during actual vehicle driving. It is assumed that considering the feature that the slip angle camber angle change of the wheel / tire occurs through the turn driving when the actual vehicle travels, it is assumed that the correct fuel consumption is determined by the tire.