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문일동(Ildong Moon),김기태(Gitae Kim),임정환(Junghwan Lim),현상학(Sanghak Hyun),오재윤(Chaeyoun Oh) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The steering feel is one of the major handling performance of the vehicle. This paper develops a computational model for objective steering feel assessment of a commercial vehicle. In order to validate the reliability of the developed computation model, tests with a real vehicle are performed. Simulation results performed with the developed computational model shows a good correlation with test results performed with a real vehicle. The developed model is used for analyzing the influence of the characteristic of a steering system and tire on steering feel. That is, a study is performed to analyze the influence of the major parameters which significantly affect on the characteristic of the steering system and tire on steering feel with the developed model.
중형 트럭 KEY ON/OFF 시 엔진 마운팅 진동 해석
국종영(Jongyoung Kuk),문일동(Ildong Moon),강경완(Kyungwan Kang),현상학(Sanghak Hyun),강영춘(Youngchun Kang) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The vibration of a vehicle, which is caused by and transmitted from the engine, has significant effect on the ride comfort and the dynamic characteristics of the engine mount system have direct influence on the vibration and noise of the vehicle. This paper examines the body shake caused by the engine excitation force on engine key on/off of a heavy truck by experiment and simulation. The analysis model consists of the engine, body including frame, front and rear suspensions and tires. The force element between body and suspension is modeled as a combination of suspension spring and damper, and the unsprung mass has roll and pitch. The engine shake obtained from experiment was compared with the result of computer simulation, and by using the verified computer model, parametric study of the body shake on engine key on/off is performed with changing the stiffness of engine mount rubber, the engine mount angle, and position of engine mounts.
유압조향계 비선형 진동시스템에 대한 요인분석 및 영향도 평가
최성근(Sungkun Choi),이창노(Changro Lee),전귀남(Kwinam Jun),임철훈(Choulhoon Lim),이현주(Hyunjoo Lee),박광칠(Kwangchil Park),현상학(Sanghak Hyun) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents a study on the rotational vibration sensitivity of automotive hydraulic power steering systems. In order to describe non-linear dynamic coupling effects between the steering rack-pinion gearbox and the hydraulic sub-system, we build two different models and co-simulate the mechanical system based on multi-body dynamics and the power system based on the hydraulics. The frequency responses of the steering wheel to the rack force are obtained to compare the experimental results. The agreement between simulation and experimental results shows the validity of the co-simulation model. The sensitivity analysis for the factors, such as rack friction, valve opening area, torsional stiffness and the inertia of the steering wheel are carried out by the design of experimental method. From the factor analysis results the effective methods to reduce the steering wheel vibration are proposed.