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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.
대형버스의 루프 진동에 영향을 미치는 인자에 관한 연구
국종영(Jongyoung Kuk),박종찬(Jongchan Park),임정환(Junghwan Lim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
If the vibration is occurred at large-sized bus roof, it makes people annoying and complaining the quality of vehicle. In design stage, it must be considered. To assess vibration at roof which is equipped with air conditioner in design stage, FE-model is constructed. Computer simulation analysis and test is performed. The dynamic characteristics of bus are found by using eigenvalue method. It is related with dynamic behavior. The running conditions of bus are velocity and road condition which followed test condition. And the frequency response of vehicle is well correlated with analysis result. Modal participation method is used for finding major modes at each peak. Front and rear suspension spring, engine mounting stiffness are selected for modal contribution. To reduce vibration level of front and rear suspension spring, engine mounting stiffness are properly combined. From this study, the vibration level is lowered at roof.
국종영(Jongyoung Kuk),김강균(Kangkyun Kim),천인범(Inbum Chyun) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Generally, rollover strength is very difficult to improve through rollover test at the initial stage of vehicle development. So, this paper are carried out the computer simulation of a large-sized bus was modeled using shell elements.<br/> And the rollover analysis results compare well with the live test results. After the usefulness of this method of analysis was confirmed, we have proposed the effective structural modification for rollover strength.<br/>
김민호(Minho Kim),국종영(Jongyoung Kuk),천인범(lnbum Chyun) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
The aerodynamic charactcristics of automobiles have received substantial interest recently. Detailed knowledge of<br/> the vehicle aerodynamics is essential to improve fuel efficiency am enhance stability at high-speed cruising. In this study, a numerical simulation has been carried out for three-dimensional turbulent fows around a commercial bus body. Also, the effect of rear-spoiler attached at rear end of bus body was investigated. The Navier-Stokes equation is solved with SIMPLE method in general curvilinear coordinates system RNG k-ε turbulence model with the MARS scheme was used for the evaluating aerodynamic forces, velocity and pressure distnbution. The results show that complex wake structure in the immediate rear of bus body has been confirmed. The rear-spoiler modifies the near wake structure and decreases aerodynamic drag and Improvement in lift force was achieved.