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내열변형 저감을 위한 A-Pillar Trim의 마운트 위치 최적설계
전지환(Jihwan Chun),이정환(Junghwan Lee),김종만(Jongman Kim),류승수(Seungsoo Ryu),김해룡(Haeryong Kim),김헌수(Hunsoo Kim),서명원(Myungwon Suh) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Interior parts composed of plastic usually deform under the various temperature conditions. It is necessary to obtain the material properties for thermal deformation analysis under the heat cycle test. Specially, creep data of plastic material was introduced to study the time-dependent deformation behavior of the pillar trim in heat cycle test. The time-hardening version of the power-law creep model was applied to account for the permanent deformation after heat cycle test, verified through the comparison of test result with FEA result for simple model. In this study, a methodology was developed for the optimum design of the A-pillar trim with mount position. The analyzed results were used to approximate a function which was constructed using response surface method. Design procedures were repeated to minimize the thermal deformation at the areas of interest.
내열변형을 고려한 프런트 필라 트림의 리브패턴 설계에 관한 연구
이정환(Junghwan Lee),전지환(Jihwan Chun),김종만(Jongman Kim),김영삼(Youngsam Kim),류승수(Seungsoo Ryu),김해룡(Haeryong Kim),서명원(Myungwon Suh) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In the development period of interior plastic parts of vehicle, the heat cycle test is an essential procedure to be confirmed. It is important to obtain the material properties for thermal deformation analysis under the various temperature conditions. Especially, creep data of plastic material was introduced to study the time-dependent deformation behavior of the pillar trim in heat cycle test. The time-hardening version of the power-law creep model was applied to account for the permanent deformation after heat cycle test, verified through the comparison of test result with FEA result for simple model. In this study, we also developed a methodology to design the rib pattern of A-pillar trim. Nonlinear finite element analysis has been implemented and integrated with sensitivity analysis method to minimize the thermal deformation at the areas of interest.
탑승자 머리 보호를 위한 B-필라 트림의 리브 구조 최적설계
김종만(Jongman Kim),이정환(Junghwan Lee),전지환(Jihwan Chun),배철호(Chulho Bae),홍형식(Hyoungsik Hong),서명원(Myungwon Suh) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The National Highway Traffic Safety Administration (NHTSA) has been studying biomechanics to decrease occupant injuries in the event of a crash. Head injury ranks among the top contributors in vehicle accidents. The FMVSS 201 regulates that an equivalent head injury criterion value called as HIC(d) should be under 1000. In this paper, analytical studies are carried out to calculate HIC(d) of B-pillar trim by using LS-DYNA. Optimum design technique for a B-pillar trim with rib structure is applied to minimize the calculated HIC(d). The design variables are spacing of the transverse rib, thickness of the transverse rib and thickness of the longitudinal rib. Experimental points are determined by design of experiment and a regression function is constructed using the response surface method. Optimization has been conducted using regression function as an objective function and optimal plastic rib design is suggested to dissipate impact energy efficiently.