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류종우(J. W. Ryu),조성권(S. K. Cho),양준모(J. M. Yang),최해천(H. C. Choi),유정열(J. Y. Yoo),이준식(J. S. Lee) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.1
Numerical and experimental studies are performed to investigate the effect of the underbody shape of the simplified road vehicle on drag and lift. Four different vehicle models with front and rear slanted variations at the lower surface are used in this study. Cases with a slanted underbody surface at front have smaller drag than those without a slanted surface. Also, cases with a slanted underbody surface at rear have smaller lift than those without a slanted surface. Pressure distributions along the model surfaces and velocity fields at the wake region are examined in detail. In general, numerical solutions are in agreement with experimental results.
류종우(J.Ryu),조성권(S.K.Cho),양준모(J.M.Yang),유정열(J.Y.Yoo),최해천(H.Choi),이준식(J.S.Lee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_2
Numerical and experimental studies are performed to investigate the effect of the underbody shape of the simplified road vehicle on drag and lift. Four different vehicle models with front and rear slanted variations at the lower surface are used in this study. Cases with a slanted underbody surface at front have smaller drag than those without a slanted surface. Also, cases with a slanted underbody surface at rear have smaller lift than those without a slanted surface. Pressure distributions along the model surfaces and velocity fields at the wake region are examined in detail. In general, numerical solutions are in agreement with experimental results.<br/>
김동규(D. K. KIM),유정수(J. S. RYU),박상언(S. E. PARK),이규현(K. H. LEE),김광희(K. H. KIM),이문용(M. Y. LEE) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
In roll forming process, a sheet metal is continuously progressively formed into a product with required cross-section and longitudinal shape, such as a circular tube with required diameter, wall-thickness and straightness, by passing through a series of forming rolls in arranged in tandem. In this process, each pair of forming rolls installed in a forming machine play a particular role in making up the required cross-section and longitudinal shape of the product. In recent years, that process is often applied to the bumper rail in the automotive industries. In this study, a optimal Front Bumper Beam manufacturing technology, model deign and proper roll-pass sequences can be suggested by forming number of roll-pass and bending angle. And also effects of the process parameters on the final shape formed by roll forming defects were evaluated.