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스포티 음색 구현을 위한 자동차 흡기 시스템의 최적화 연구
유충준(C. J. YOU),유태민(T. M. YUN),강창기(C. K. Kang),이재응(J. E. LEE) 한국동력기계공학회 2010 동력시스템공학회지 Vol.14 No.2
In the study, it is considered sporty car as 1400㏄ entry cars using sound generator. These cars are required special sound quality, also sporty sound quality. The operational principle of this sound generator system is that on the operation of the engine intake valves caused pulsating is to shake the membrane of the sound generator on the inside of the driver front dash panel through the intake manifold, which will deliver the required sound quality and tone. For the component constructed sound generator, main design parameters are selected and optimized using the daguchi's method. The results are as follows; The C2 sound level must be minimized and C4 level must be maximized. And also overall level keeps linear characteristics.
조도효과를 고려한 다공질 공기베어링의 정강성 특성에 관한 수치해석 연구
권혁록(H.R. Gwon),이성혁(S.H. Lee),이재응(J.E. Lee) 한국전산유체공학회 2008 한국전산유체공학회지 Vol.13 No.2
This study aims to investigate numerically the static stiffness characteristics of porous air bearing and to estimate appropriate permeability values of porous medium. In particular, a new roughness model is proposed and implemented into the commercial CFD code (FLUENT Ver. 6.2) by using C language based user subroutine. The predicted results are extensively compared with experimental data. The roughness model is also validated through comparison with the results from open literature. It is found that the predictions for static stiffness are in good agreement with experimental data. Therefore, the suggested model based on the roughness Reynolds number can be used in studying the stiffness characteristics of porous air bearing effectively. In addition, numerical simulations of various diameter size and conditions are conducted. According the results, it is expected that the static stiffness of porous air bearing has the non-linear characteristics.
차량 현가계의 감쇠력 변화와 주행상황에 따른 승차감의 연구
이병림,이재응 중앙대학교 기술과학연구소 1995 기술과학연구소 논문집 Vol.25 No.-
In this paper, the driver perception response(comfort) has been studied with a semi-active suspension vehicle. Toward this end, appropreate conditions of suspension system(i.e. damping coefficient of the damper) was analytically derived for each case of the different driving conditions(driving velocities and road conditions). Real driving test was also performed to prove the analytical results. The final results show that semi-active suspension system is quite effective only when driving velocity is under 60km/h and off-road condition.