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신석영(Seokyoung shin),원광민(Kwangmin Won),이승엽(Sungyop Lee),김진현(Jinhyun Kim),진용욱(Yong Wook Jin),김성열(Sungyeol Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
4WD Driveline is quite a bit complex system. It has more parts than 2WD driveline. Therefore it is necessary to consider the whole system to make good performance. In this paper we studied 4WD driveline booming and transfer rattle noise among many 4WD problems. 4WD booming and transfer rattle noise take place when 4WD driveline is not properly designed. There are driveline natural modes in 4WD driveline system. When the system is not properly designed, one of the modes is the reason of Booming and transfer rattle noise. We showed the mechanism of 4WD booming and transfer rattle noise in test and simulation. Through test & simulation, we examine solutions like DMF, transfer gear ratio and 4WD coupling tuning..
김성열(Sungyeol Kim),이승엽(Sungyop Lee),김진현(Jinhyun Kim),원광민(Kwangmin Won) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This paper presents an approach to widen torque converter clutch lock-up zone to improve fuel efficiency of an AT vehicle by preventing driveline abnormal vibration. Most of all torque converter damper clutches consist of two stages of damper springs. This non-linear characteristic may result in abnormal vibration in driveline when damper clutch stiffness and first stage torque limit (T1) are not appropriately tuned with engine output torque characteristics, and TCU lock-up zone setting. To predict drive train torsional abnormal vibration we carried out simulations for several types of engines and test in vehicles to verify them. The result suggests the design method, which decides T1 that can prevent abnormal vibration in drive train, and improve fuel efficiency, considering engine types, output torque-speed curve, torque map and TCU mapping.