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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.
범현균(Hyenkyun Beom),김요셉(Joseph Kim),조기순(Kisoon Cho),이호기(Hoki Yi) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
This paper statistically reviewed for the USNCAP frontal crash test results carried out by NHTSA. Vehicle samples were selected on total 20 vehicles which were included on 15 MPV&SUV and 5 Pickup. The results was summarized as followings. The driver’s performance was better than the passenger’s in the average sense. There are several differences between driver and passenger in the USNCAP front test, for example dummy size, seating position, airbag style. Main effect was Neck injury for crash performance on both dummies for the average value. Root cause of neck injury was different for each dummy, ie, the driver caused from Nte & Ntf, but the passenger did absolutely Nte mode. Reliability is dependent upon chest injury on the driver and neck injury on the passenger from the standard deviation. Restraint system was also summarized.
2011년 모델에 대한 정면 미국신차안전도평가 결과에 대한 통계적 분석
범현균(Hyenkyun Beom) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
New car assessment program(NCAP) originated from USNCAP in 1979 has been implemented in several countries or markets, for instance USA, Europe, Korea, Japan, China and Australia. NCAP has contributed greatly to reduce accidental tolls. But recently, NCAP performance has no distinction between cars because manufacturer have been continuously developed to improve NCAP performance. Therefore, NHTSA announced new USNCAP protocol becoming effective from MY2011. NHTSA has carried out many NCAP tests based on the new test protocol and announced these test results. In this paper, USNCAP test results were reviewed by statistical method. This review was focused on passenger cars and frontal crash test results in order to investigate effect of changes in new NCAP protocol. There are two key changes, one is sited female dummy in passenger position, the other is enlarged to 4 scoring body regions in each dummy. The review results were summaried followings. Performance in Passenger(12.5%) is lower than Driver’s(50%) for number of 5 star vehicle. Neck injury criterion is dominant to NCAP star rating for both dummies in the mean sense. For standard deviation, chest deflection is showed largest value in driver dummy but neck injury criterion is showed for passenger’s. DKAB and PKAB were equipped 28.1% and 6.2%, respectively. Consequently, the countermeasure for new USNCAP frontal crash test is essential to control well dummy kinematics with some safety features including KAB to reduce neck injuries.
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.