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조영건,윤용산,Cho, Young-Gun,Yoon, Yong-San 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.7
This study deals with the vibration ride quality for passenger car when running on straight highway at the speed of 70km/h. Ten accelerations were measured at four positions, three axes each at the feet, hip, and head, and one axis at the back. Five seats that have different static sponge stiffness were used, and two subjects were participated. These accelerations were analyzed to produce the ride values such as component ride value and overall ride value. It was hard to see the difference of ride value by the change of sponge stiffness. However we could rank the ride quality by the total vibration exposed to passengers. From the transfer function between the hip and the foot, the fundamental mode was observed to be around 5.8Hz. Also the transfer function between the head and hip was studied. The optimal damping ratio of the seat was calculated according to the seat natural frequency with human weighting filter which makes the optimal damping ratio different from that without weighting filter.
조영건(Young-Gun Cho),박재용(Jae-Yong Park),오영호(Young-Ho Oh) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Drift is the path deviation observed when the steering wheel is released during steady state operation, and it is measured over a specified distance under keeping velocity. Drift is one problem among major customer's complaints according to IQS(Initial Quality Study). This paper deals with the vehicle characteristics experiencing steering drift under straight line driving. We focus on the theory of vehicle drift/pull during straight line driving, and present a management scheme of car body tolerance and modification of suspension parameters.
차량 동역학 시뮬레이션을 위한 도로 변위 및 속도 신호의 생성
조영건(Young-Gun Cho),박세진(Se-Jin Park),윤용산(Yong-San Yoon) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
The road signal is generated by white random noise which is passed through FIR filter according to ISO standard. In addition the road velocity signal is made by the derivative of the displacement signal using cubic spline which has relatively good differential gain and phase. The generated road signal enables tire to have damping characteristics which is sometimes omitted due to the difficulty in generating road velocity profile.
조영건(Cho Young-Gun),진종학(Jin Jong-Hak),김태형(Kim Tae-Hyeung),김기갑(Kim Ki-Kap),김혁(Kim Hyuk),문기준(Moon Kee-June),윤용산(Yoon Yong-San) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
It is important to determine the positions of the hard points that can generate a desired kinematic characteristic in suspension design. To do such a thing, kinematic sensitivity and optimization were conducted. The cost function is total weighted sum of errors between desired and actual toe, camber, caster, kingpin angle, etc. Kinematic sensitivity was calculated for design variables such as hard points and these results were compared with finite difference method. Optimization was executed by BFGS method . And GUI program that makes this process handled easily was developed for McPherson, SLA, QT, Quadra-link.<br/>
고영은(Young Eun Ko),박영욱(Young Wook Park),조영건(Young Gun Cho),김중주(Jung Ju Kim),이언구(Un Koo Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper introduces a newly developed suspension system for new Elantra model of Hyundai Motor Company which will be on the market this year. The new chassis of Elantra has been developed to give more driving pleasure and confidence to a driver. To achieve these driving targets, the suspension has been changed and finely adjusted to achieve better ride and handling performance compared with the previous generation. Especially, a new multi-link suspension which has two upper links has been developed. The kinematics and compliance characteristics have been contrasted to those of the previous model. Also, the crashworthiness and package efficiency has been considered without limitation of suspension performance. Based on the customer's voice of market, the suspension of new Elantra has tried to fit the all kind of the customer's demand.