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무소음 가진기를 이용한 자동차 시트의 진동특성 재현 평가
이경태(Kyungtae Lee),최두석(Dooseuk Choi),전용두(Yongdu Jun),이유종(Yujong Lee),최상민(Sangmin Choi) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This study is a reproduced vibration performance of vehicle seat using quite excitation system. The noise and vibration that often occurs when driving at different speeds by different road condition. The vibration of road test measure is separate 4point seat mounting and the vehicle out of 2point using accelerometers. The measured time data transfer PSD data for exciter profiles. A quite excitation system operate the vehicle body under the identical condition, road test by PSD data. Compares are a transferred PSD date of a measured vehicle seat and a mesured excitation system. Finally, the reproduced ratio is evauated via the total PSD level.
Vortex Tube의 엔진 배기가스 에너지 분리특성에 관한연구
정영철(Youngchul Jung),최두석(Dooseuk Choi),박성영(Sungyoung Park),김창수(Changsu Kim),이상인(Sangin Lee),류정인(Jeongin Ryu) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
An object of this study is to confirm the opening amount of the throttle valve that is begun the energy separation of vortex tube for various engine speed and load condition in a common rail diesel engine. The vortex tube located at downstream of the exhaust manifold is a device separating the incoming exhaust gas to hot and cold stream. To find optimum separation efficiency of vortex tube, the opening amount of throttle valve has been investigated for various engine speed and load conditions. It was found that the influence of engine speed is dominant compared with that of engine load. As engine speed is increased, the throttle opening amount starting energy separation is reduced.
초음파 조사 바이오 디젤유 적용시 커먼레일 디젤기관의 특성에 관한 연구
정영철(Youngchul Jung),최두석(Dooseuk Choi),임석연(Seukyeon Im),류정인(Jeongin Ryu) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
The reformed bio-diesel fuel irradiated by the ultrasonic wave is applied to the diesel engine of common rail in common use recently. This study has the object to examine the properties of engine performance and discharged materials. The bio-diesel fuel is mixed and used with the diesel fuel in common use at the ratio of 20% or 100%. The ultrasonic energy is irradiated to the individually mixed fuel in order to reform the fuel. This fuel is applied to the engine in this experiment. And It is compared and analyzed from the experimental results with two cases irradiating the ultrasonic wave and no irradiating.
조재웅(Jaeung Cho),최두석(Dooseuk Choi),김기선(Keysun Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
This study investigates the fatigue life and the damage possibility of connecting rod by the fatigue tool of Ansys workbench. The case of constant fatigue loading variation 'Sine' becomes more stable than that of nonconstant loading but the magnitude of constant load becomes larger than that of nonconstant load. Among nonconstant fatigue loads, the case of 'SAE Bracket History' which is severest at the variation of load tends to be most unstable. The case of 'Sample History2' which becomes a little slow at the variation of load tends to be most stable. The maximum relative damage in case of 'SAE Bracket History' is occurred near the average stress '0' and this case can be shown to have the possibility to take more damage than another case.