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유동열(Dongyeol Yoo),김재완(Jaewan Kim),조광수(Kwangsoo Cho),범현균(Hyenkyun Beom),권오성(Osung Kwon) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study describes a numerical simulation technique using finite element method for improvement of US NCAP side impact performance. The side impact analyses were conducted to reduce the injury value of occupant using LS-DYNA. In order to improve side impact performance, the base model was correlated with test results and a many of cases design study were carried out. These were modified front and rear door structure and door trim pad that were affected to dummy injury by direct contact under side impact. In this study, by changing of door structure and door trim pad shape, optimal design for reducing dummy injury value was obtained.
Multibody-FE Coupling을 이용한 정면 북미NCAP 조수석 승객상해 예측기법 연구
이주혁(JooHyuk Lee),최장훈(JangHoon Choi),이강욱(KangWook Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
National Highway Traffic Safety Administration (NHTSA) enhanced the New Car Assessment Program (NCAP) rating program. The previous rating program was based on the combined chance of serious injury to the head and chest. Now, the new program includes all of the Federal Motor Vehicle Safety Standard (FMVSS) No. 208 body regions like head, neck, chest, and femur. The new program also uses a different crash test dummy (Hybrid III 5th%ile female dummy) in the frontal passenger side. In this paper, a comparative study on the femur load was accomplished to meet reliability and effectiveness.
US NCAP 및 IIHS 측면 충돌 시험법간 특성 비교 및 시험 시 오차 인자에 의한 영향 검토
배준석,김호,소영명 사단법인 한국자동차안전학회 2024 자동차안전학회지 Vol.16 No.1
Side impact with MDB (moving deformable barrier) is common in side crash test protocols around the globe, most of which are quite similar to that of US NCAP side impact protocol but IIHS side impact protocol is considered to be the most harsh one due to the MDB’s weight and impact speed. In this study US NCAP side impact and IIHS side impact test conditions are compared with respect to delta-V (impulse of the test vehicle), roll speed, and yaw speed as well as survival space (the smallest distance between the front driver seat cushion center to B pillar after the test). Error factors (friction between tire and ground, tolerance of vertical and longitudinal position of the MDB with respect to the test vehicle), which are resident in the test protocol is studied with respect to the global vehicle behavior (delta-V, roll, yaw) as well as survival space.
타격 위치 산포를 고려한 운전석 무릎 상해 저감에 관한 연구
최장훈(Janghoon Choi),이강욱(Kangwook Lee),윤헌준(Heonjun Yoon),하종문(Jongmoon Ha),윤병동(Byeng D. Youn) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Knee bolster structure reducing driver’s femur load should be designed to get more than 5 star rating in US NCAP and satisfy FMVSS 208 during vehicle collision. However, although an optimal knee bolster design is applied by FE simulation, occupant’s femur load sometime exceeds safety criteria in sled test. One of dominant factors that make a difference between simulation and test is knee impact position. In reality, knee impact points of sled test could not be exactly coincident with that of FE simulation and have some distributions according to test environments. Therefore, it is necessary to consider a scattering of impact points of sled test. In this paper, a knee bolster design was derived by FE simulation which considered statistically knee impact position using EDR method which was very efficient and accurate for reliability analysis.
커튼 에어백 보호성능 육성을 위한 해석 모델 단순화 연구
송준영(Juneyoung Song),이강욱(Kangwook Lee),안병재(Byungjae Ahn) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The main role of CAB(side curtain airbag) is head protection in a side crash. The updated US NCAP for model year 2010 requires more extended coverage of CAB by regulating 5<SUP>th</SUP>%ile driver and rear passenger as well as 50th%ile driver. The general safety analysis model is efficient by using only concerned sub-structure of the full vehicle and prescribed structural motion. But, regarding optimization, the analysis model needs to be more efficient because more runs are required and model should be heavier to consider extended sub-structure. In this study, three types of simplified analysis models were introduced. The first has an impactor which is composed of head and neck with prescribed translational motions. It uses only the upper parts of the original sub-structure so the run time can be saved by 60~70%. But the efficiency is still insufficient and it showed relatively high sensitivity to initial conditions. The other two models use a linear impactor with head or head and neck and simplified structure by transforming 3 dimensional structure to 2 dimensional fixture. These methods save about 90% of the simulation time. Among the three models, two were chosen based on the accuracy and the robustness against initial conditions. And DOE were done using the two selected models to find out which one is the most competent for optimization.