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실험계획법을 이용한 STS301L 이음재의 GMA 용접 자동화에 관한 연구
백승엽,손일선,Baek, Seung-Yeb,Sohn, Il-Seon 대한용접접합학회 2010 대한용접·접합학회지 Vol.28 No.4
Stainless steel sheets are widely used as the structural material for the railroad cars and the commercial vehicles. These kinds structures used stainless steel sheets are commonly fabricated by using the GMAW (gas metal arc welding). For fatigue design of GMA welded joints such as fillet and plug, ring type joint, it is important to obtain optimum design factor information on GMA welded joints. in this paper, analysis approach for fatigue test using design of experiment are evaluated optimum factor in GMA welded joint type and geometrical parameters of materials. Using these results, that factors applied to fundamental information for fatigue design.
자동차용 알루미늄 5185-폴리프로필렌 샌드위치 판재의 성형성
김기주,정효태,손일선,김철웅,김중배,Kim, Kee-Joo,Jeong, Hyo-Tae,Sohn, Il-Seon,Kim, Cheol-Woong,Kim, Joong-Bae 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.2
The objective of this study was to develop formability evaluation techniques in order to apply aluminum sandwich panel for automotive body parts. For this purpose, newly adopting formability evaluation (using limit dome height and plane strain test) was carried out in order to secure the fundamental data for the measurement of sheet metal forming and the establishment of optimum forming conditions of the aluminum sandwich panel. The results showed that there were good agreements between the old formability evaluation method and the new method which was more simplified than that of old one. From the results of these formability evaluation, the formability of sandwich panel was higher than that of aluminum alloy sheet alone which was the skin component for the sandwich panel. Also, it was found that sandwich panel could reduce the weight and could have the same flexural rigidity simultaneously when it was compared to the automotive steel sheet.
김범준(Bum Joon Kim),신주경(Ju Kyung Shin),이정구(Jeong Goo Lee),손일선(Il Seon Sohn) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.1
The molding process can be divided into five separate steps: plastification, injection, holding, cooling, and finally ejection. In the plastic injection molding, the effect factor such as mold temperature, injection speed, packing pressure and inhomogeneous cooling under packing process affects both the article dimension and physical characteristics. Especially, the packing pressure is the most critical factor to affect molded articles quality among the packing parameters. In this paper, the CAE simulation considering the molding condition is performed to predict the faulty cause which appears in the packing process between cavities of injection molding machine. From the results of CAE simulation, the packing phenomena according to the product form and the gate position was investigated to improve the article quality and minimize the various molding defects. The effect of packing pressure and gate number on the injection molding was discussed.
김춘휴(Choonhyu Kim),김기주(Kee Joo Kim),정효태(Hyo-Tae Jeong),김철웅(Cheol-Woong Kim),손일선(Il-Seon Sohn),김중배(Joongbae Kim) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.6
Rubber materials have the nonlinear, large deformation and viscoelastic behavior. W.D. Kim et al. studied these characteristics through the static, fatigue, dynamic, aging and viscoelastic test. This paper discussed that the properties of engine mounting rubber, such as static stiffness, fatigue life and damping factor, are predicted based on CAE by using material properties acquired by the report of Kim et al. In result, the static stiffness of engine mounting rubber is predicted approximately in comparison with test value. Also, it was confirmed that the relationship of fatigue life and Green-Lagrange strain in specimen was the valid tool to predict the fatigue life of engine mounting rubber. From the results of transient viscoelastic analysis the damping factor changed rapidly at the range less than 8hz.
차량 NVH개선 설계를 위한 샤시 구동계의 Driveline Test Bench 구성 및 CAE 해석
김기주(Kee Joo Kim),주형준(Hyung Jun Ju),이용헌(Yong Heon Lee),배대성(Dae Sung Bae),성창원(Chang Won Sung),백영남(Young Nam Baik),손일선(Il-Seon Sohn) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.1
The authors have investigated the NVH problems of drive system in full vehicle test. However it is difficult to define the NVH problems of driveline system. Since it is hard to measure the rotating part and it is vague that only the drive system induces the NVH problem. Vibration in a driveline is presented in this paper. In the experiment, the rear subframe and propeller shafts and axle were composed and mounted with rubber each other. For applying the vibration input instead of the torsional vibration effect of an engine, the shaker was taken. In particular, torsional vibration due to fluctuating forced vibration excitation across the joint between driveline and rear subframe was carefully examined. Accordingly, the joint response was checked from experiments and the FEsimulation using FRF (frequency response function) analysis was performed. All test results were signal processed and validated against numerical simulations. In present study, the new test bench for measuring the vibration signal and simulating the vehicle chassis system was proposed. The modal value and the mode shape of components were analyzed using the CAE model to identify the important components affecting driveline noise and vibration. It could be reached that the simplified test bench could be well established and be used for design guide and development of the vehicle chassis components.
차량 엔진크레들용 크로스멤버 부품의 하이드로-포밍가공 및 해석
김기주(Kee Joo Kim),이용헌(Yong Heon Lee),배대성(Dae Sung Bae),성창원(Chang Won Sung),백영남(Young Nam Baik),손일선(Il-Seon Sohn) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.2
The environment and energy related problem has become one of the most important global issues in recent years. One of the most effective ways of improving the fuel efficiency of automobiles is the weight reduction. In order to obtain this goal the hydroforming technology has been adapting for the high strength steel and its application is being widened. In present study, the chassis components (mainly cross members of engine cradle) simulation and development by hydroforming technology to apply high strength steel having tensile strength of 440 ㎫ grade is studied. In the part design stage, it requires feasibility study and process design aided by CAE (Computer Aided Design) to confirm hydroformability in details. Overall possibility of hydroformable chassis parts could be examined by cross sectional analyses. Moreover, it is essential to ensure the formability of tube material on every forming step such as pre-bending, performing and hydroforming. In the die design stage, all the components of prototyping tool were designed and interference with press was investigated from the point of geometry and thinning.