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수동 전륜 구동 차량에서의 출발 셔더 미케니즘에 관한 연구
윤재원(Jaewon Youn),송재은(Jaeeun Song),이정근(Jungkeun Rhee) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
This paper investigates the launch shudder phenomenon at the front wheel drive vehicle with manual transmission. The shudder is always accompanied with engine surge, wheel torsional vibration and mounts vibration resonance, especially powertrain roll motion. It means that shudder occurs according to the increase of external load come from vehicle drive system or road. In this study, the shudder mechanism model was created by experimental study of torsional behavior of powertrain and drive system components. One dimensional multi DOF vehicle torsional analysis model was created and used to verify reduction of shudder by increasing clutch hysteresis and adapting dual mass flywheel. To reduce the powertrain roll motion, mount property was changed and mount system was optimized.
윤재원(Jaewon Youn),손아름(Areum Son) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
This paper describes about the process of noise and vibration improvement of small gasoline engine. First of all, powertrain noise and vibration group must cooperate with vehicle engine group and energy group to set up reasonable NVH targets. And then, select quiet engine features base on engine N&V BOD/BOM to make a robust engine for noise and vibration.
Scaling & Superimposing 기법을 활용한 크랭크샤프트 댐퍼 허브의 내구성 평가에 관한 해석적 연구
윤재원(Jaewon Youn),이병하(Byung-ha Lee),강병권(Byoungkwon Kang) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
This paper introduces the process of evaluating the durability of the hub of a torsional vibration damper (TVD) using “Scaling & Superimposing” method. TVD is an essential part used to absorb the torsional vibration resonance energy of the crankshaft and to reduce the torsional vibration magnitude when the engine is running. Such TVDs generally consist of a hub, an inertia ring, and an elastomer. The hub is bolted to the front end of the crankshaft and subjected to a combination of static and dynamic loads. If they exceed the material limit of the hub, the hub breaks, leading to failure of the crankshaft. Therefore, the TVD hub must be designed faithfully for the purpose of reducing the torsional vibration of the crankshaft and must also have sufficient resistance for the safety of the crankshaft. The Scaling & Superimposing method used in this analysis can be divided into two areas: stress analysis by a static load and stress analysis by a dynamic load. In this case, the static load refers to the interference between the hub and the crankshaft nose that is generally applied when assembling the TVD and the tightening load of the TVD bolt. And in order to analyze the stress due to the dynamic behavior of the crankshaft, it is necessary to grasp the crankshaft displacement information first. This can be obtained through cranktrain dynamic analysis, which consists of displacement information for each angle during the crankshaft rotation period (typically 720 degrees for 4 cycle IC engine) and then the stress analysis under dynamic behavior can be performed. However, because it requires too much analysis resources, the scaling technique is used for more efficient and simpler analysis. After the two kinds of stress analyses were completed, the results were superimposed to calculate the final mean stress and amplitude stress on the hub. By comparing this with material strength of TVD hub, a safety factor for durability evaluation was generated.
윤재원(Jaewon Youn),홍상수(Sangsoo Hong),송재은(Jaeeun Song),손아름(Areum Son) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This paper investigates on the improvement of gerotor type engine oil pump noise. Gerotor type pump is widely used as oil pump because of its simplicity and high efficiency. Noise from gerotor oil pump is basically affected from teeth number of its inner rotor and oil passage system. By increasing teeth number and improving relief valve and oil passage system, harmonic order noise was definitely decreased.
이남훈(Namhoon Lee),윤재원(Jaewon Youn),이정근(Jungkeun Rhee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
GM Korea has developed new CVT mini vehicle reflecting customers concerns about low fuel economy at high speed and lack of power in the current AT vehicle. Currently adopting CVT system is increasing due to following reasons. 1) CVT can provide better fuel economy than AT by enabling the engine to run at its most efficient rpm for a range of vehicle speeds and continuous gear ratio change. 2) It can be used to maximize the performance of a vehicle by allowing the engine to turn at the rpm at which it produces maximum torque and power. 3) It is more comfortable than AT by minimizing shift shock with continuous gear ratio change. But additional N&V issues, result in weight increase compare with AT, should be treated and optimized well. During the CVT vehicle development, rumble noise in vehicle interior was issued. Generally main source of rumble noise is crankshaft and powertrain bending but main contributor is structure-born noise transferred by engine and transmission mounting system. Rumble noise is problematic if mounting system design is not optimized for the powertrain vibration mode or it can’t minimize or amplify the powertrain rumble vibration. This paper shows root-cause of rumble noise and its improvement process which appeared in the CVT vehicle development process. Applying Red-X method, WOW BOB vehicles were chosen to compare the noise level difference and to estimate contribution and improvement potential of each component and N&V test have been carried out for these selected items.
김도중(Dojoong Kim),윤재원(Jaewon Youn),김진웅(Jinwoung Kim),송진욱(Jinook Song) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
Rotation of intake and exhaust valves are very closely related to the long term durability of automotive engines. If the valves do not rotate even at a rated engine speed, it causes the uneven wear of the valve seat and valve head contact area. which eventually shortens the engine life. A principle of valve rotation mechanism was presumed based on some findings from experiments, and computer programs were developed to simulate the valve rotation phenomena. In this study we investigated the valve rotation mechanism by using the computer simulation models.