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Torsional Vibration Model을 이용한 Powertrain 거동 연구
이한걸(Hangeol Lee),송재은(Jaeeun Song),이정근(Jungkeun Rhee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Recently the research of powertrain torsional vibration behavior due to engine torque fluctuation has been widely studied. Shudder and Clunk are typical torsional phenomenon , which take places low frequency range from 10 ㎐ to 30㎐. This vibration is transmitted from many different locations towards indoor in vehicle and typically contributes to booming noise. In this paper, torsional vibration analysis model is developed in order to expect the torsional behavior of powertrain . At first, driveline torsional vibration model using AMESim is built. Then torsional vibration analysis is carried out under engine maneuver condition. It is found that clutch damper design is one of the main effective counter-measures to reduce torsional vibration.
Start/Stop 차량의 NVH 예측을 위한 하중 생성에 관한 연구
이한걸(Hangeol Lee),조미희(Mihui Jo),민선기(Sunki Min) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Although engine start-stop system has many advantages in terms of fuel economic and the reduction of emission., it can cause undesired vibration to the occupant of the vehicle, In this paper, an investigation of the engine start-stop vibration issues has been presented. The investigation concludes that engine start-stop NVH issues are caused by crankshaft reaction torque coming from the combustion pressure and the inertia torque. To minimize force inputs from the powertrain to the vehicle, torsional vibration analysis method is used to provide recommendations. It is found that increased cranking speed and improving starter motor performance are effective to reduce vibration level due to PT roll mode.