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조영건(Younggun Cho),오영호(Yeong Ho Oh),심정수(Jeong Soo Shim),김채원(Chae Won Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
For the purpose of simulation of vehicle dynamics, a physical model of an automotive shock absorber (damper) was developed and implemented in ADAMS/Car. As well as nonlinear characteristics of force vs. speed, a model with transient pressure and flow rate equations was subroutine-linked for precise damping performance prediction. An exciter model, as a test-rig, that generates velocities between both ends of the damper was built to measure damping reaction force.
조영건(Younggun Cho),이용섭(Yong-Sub Yi),오영호(Young-Ho Oh) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
During escaping from parking maneuver, it is expected that steering wheel is returned automatically for stable vehicle performance. Steering returnability originating from tire forces and moments depends on suspension and steering geometry characteristic at low speed driving. In this study, the steering rack force is analyzed by the component force to the vertical, lateral, driving, and rolling resisting direction. Their contributions are discussed according to inside and outside wheel. Finally, simulation results are validated by full vehicle simulation.
고진공 다이캐스팅 공법 적용한 알루미늄 서브프레임 개발
조영건(Younggun Cho),임태성(Taeseong Lim),장상길(Sang-gil Jang),조철환(Cheol-hwan Cho) 한국자동차공학회 2012 한국 자동차공학회논문집 Vol.20 No.4
The subframe has been generally manufactured by using stamped steel material. Recently, automotive designers are considering aluminum as lightweight material. This paper describes the development process of an aluminum subframe which is made by high level vacuum die casting process, which is beneficial for minimizing gas contents and material properties. The weight of manufactured subframe is reduced by 4kg with the comparison of steel subframe. The aluminum subframe is packaged for the current vehicle layout and the imposed requirement is to attain a better structural performance that is evaluated in terms of mounting stiffness, noise and vibration, and endurance performance. The NVH evaluation results show that sound level is decreased by 8dB with the help of high roll-rod mounting stiffness as well as high structural modes.
물성치가 다른 시트에서의 인체 진동 측정 및 승차감 평가
조영건(Younggun Cho),박세진(Sejin Park),윤용산(Yong-San Yoon) 한국자동차공학회 2000 한국 자동차공학회논문집 Vol.8 No.3
This paper deals with the whole-body vibration and ride quality evaluation in the vertical direction. The responses of the floor, hip, back, and head in four subjects were measured for various seats when the floor was excited by random vibration with r.m.s of 1.0m/s² in the vertical direction. In the transmissibility between the hip and floor, the fundamental mode is observed at 4.4Hz. In the transmissibility between the head and floor, the fundamental mode at 4.4Hz and the second mode at 7.6Hz are observed. It is shown that the head motion is 41% larger than the hip motion and the response of female subject is larger than that of male subject. The response without backrest also was compared with that with backrest.<br/> From these human responses ride quality of five seats were evaluated by the ride value such as transfer ratio having frequency weighting function in the statistical sense. It is observed that the seat having high damping property can reduce the most acceleration exposed to hip in the statistical sense for all ride values, while the seat having different seat spring doesn't show statistical difference.
알루미늄 고진공 다이캐스팅 공법을 적용한 전륜 서브프레임 개발
윤석진(Sukjin Yoon),김성구(Seonggoo Kim),김규록(Gyurok Kim),정의근(Euikeun Jeong),이용욱(Yonguk Lee),조영건(Younggun Cho) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In the automobile industry, many parts are manufactured by applying aluminum materials to improve fuel efficiency and reduce vehicle weight. In particular, in order to design and manufacture future electric vehicles, the weight reduction of vehicles is receiving more and more challenges. In the case of a suspension part, since it is located in the lower part of the vehicle, it has a great advantage of improving fuel economy due to weight reduction. This paper describes the development stage of a front wheel subframe with a welded structure of aluminum high vacuum die casting method and extrusion method. The result of the aluminum subframe study showed that the weight was reduced by 5.6㎏ and natural frequency was improved by 16㎐ compared with the steel subframe.
알루미늄 저압중공주조 공법을 이용한 후륜 크로스멤버 개발
윤석진(Sukjin Yoon),손준형(Junhyung Sohn),장우정(Woojung Jang),윤주영(Juyoung Yoon),이용욱(Yonguk Lee),조영건(Younggun Cho) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
In the case of a suspension part, since it is located in the lower part of the vehicle, it has a great advantage of improving fuel economy due to weight reduction. In order to reduce the weight of vehicles, there are increasing cases of applying aluminum to suspension parts. This paper describes the stages of development of a rear cross member with a welded aluminum low pressure hollow casting method and extrusion method. The result of the aluminum cross member study showed that the weight was reduced by 6.3㎏ and natural frequency was improved by 46.7㎐ compared with the steel cross member.