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호주 신차안전도평가의 하부다리 상해치 개선을 위한 경차의 Footrest 형상 최적화
김요셉,이만수,남정인,한재녕,Kim, Joseph,Lee, Mansu,Nam, Joungin,Han, Jaenyung 한국자동차안전학회 2015 자동차안전학회지 Vol.7 No.1
In order to protect occupant during car crash accident, Regulation and NCAP(New Car assessment Program) have been developed among various countries like U.S.A., Europe, Korea and Australia. Especially NCAP scores affect to sales of vehicles. So vehicle makers are trying to get good score in NCAP. Low leg injuries play an important role in Australia and Euro NCAP and these injuries are related with footrest design. Optimization of footrest design in early stage of vehicle development is necessary to obtain better and robust results of low legs during crash tests. In this paper, DFSS method and finite element model were used to optimize the low leg performance in small RHD vehicles. Compared with the lower leg injury of base model, the lower leg injury of proposed model was slightly improved and robustness was enhanced also.
MADYMO Gas Flow 방법론을 이용한 뒷좌석 측면 에어백의 Vent Position에 따른 SID-IIs 상해치 개선에 관한 연구
한표경(Pyokyoung Han),이현섭(Hyunseop Lee),최현진(Hyunjin Choi),이만수(Mansu Lee) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
When analyzing occupant behavior about the lateral crash using MADYMO, a side airbag has become an important factor to improve accuracy compared with test data. There are two methodologies to simulate side airbag in the MADYMO. The first step is the UP methodology to be assumed the unique condition regarding internal gas flow of side airbag. The merits of the UP are fast modeling, short run time and effective deployment. The second step is the GF methodology to be assumed variable condition as volume variation regarding internal gas flow of side airbag. The GF can describe a few more real physical deployment of side airbag than UP. The UP is universally used to save time in occupant behavior analysis. However, the UP cannot certify to difference of dummy injury as variation of side airbag vent position because of supposing unique condition regarding internal gas flow of side airbag. Therefore, the GF is more effective than UP in the view of vent position analysis. This study shows SID-IIs injury improvement as vent position variation of rear side airbag through the GF under the USNCAP lateral MDB crash mode.
복합소재의 유한요소 재료모델링 변수에 따른 머리 상해치 민감도 평가
임종수(Jongsoo Lim),방용식(Yong sik Bang),이만수(Mansu Lee) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
자동차 내장재로 사용되는 헤드라이너 (Headliner)는 다층의 복합소재가 적용된 대표적 제품으로 북미 법규 시험인 FMVSS201 S6의 머리 상해도 평가를 위한 유한요소 해석 시 인장 압축의 비대칭성 및 이방성과 같은 복합재료 소재의 기계적 거동 특성을 적절히 반영할 수 있는 재료 모델링 기법이 요구 되고 있다. 사전 연구를 통해 전형적인 금속 재료의 소성 구간에서 발생하는 경화 현상을 설명해주기에 적합한 기존의 재료 모델링 기법은 소성 과정에서 연화 현상 (damage effect)이 발생하는 헤드라이너의 경우에는 적용에 한계가 있음이 규명되었으며, 이런 연화 현상을 고려한 시편 단위의 인장 및 3점 굽힘해석에는 실제 시험의 하중 변위 선도를 잘 예측함을 확인하였다. 이에 본 논문에서는 헤드라이너 재료모델링에 사용되는 변수들 즉 영률, 응력 변형률, 연화도 (Damage)와 제조 공정상 발생할 수 있는 헤드라이너 각 층의 두께 변화가 실차 FMH 유한요소 해석 시 머리 상해도에 미치는 영향을 정량적으로 살펴보고 각 인자의 기여도를 분석하였다.
보행자보호를 위한 Fender mounting bracket 형상 최적화
주영준(Youngjun Joo),배현우(Hyunwoo Bai),이만수(Mansu Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently EURO-NCAP which is the organization assess the safety of crashworthiness of the vehicle enforces the pedestrian protection test protocol, and globally many countries are going to legislate some protocols for the purpose of the pedestrian protection as following the GTR(Global Technical Regulation). HIC(Head Injury Criteria) is one of the assessment measures in the pedestrian protection test which is calculated from the acceleration value when the human head-form is impacted to the vehicle’s hood or windscreen and is effected by the vehicle structure, material, and thickness etc. Most of the vehicle shows high HIC value in the area of between hood and fender due to the fender mounting bracket. By changing the Fender mounting bracket design the HIC value can be improved.
측면충돌 시 뒷좌석 어린이 탑승자 상해 및 거동에 관한 연구
김승기(Seungki Kim),오은경(Eunkyung Oh),임종현(Jonghyun Yim),이만수(Mansu Lee) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
Occupants protection has been focused on frontal impact and adult dummy so far. Many people are becoming aware of rear seat occupants as large child and female recently. Large child occupants will be evaluated the KNCAP from 2017 and the ENCAP from 2016. However, there are very few crash tests with large child dummies in side impact. The objective of this study was to evaluate the kinematic and injury of large child dummies. Crash test were conducted with Q6 and Q10 years old anthropomorphic test device (ATD) in 55km/h side impact by using AEMDB (1300kg) to correlate CAE model (LS-DYNA). In This paper, safety performance of different positions of child dummy compared on the basis of the CAE case study results. That results shows how to apply restraints system and CRS (Child Restraints System) in side impact test protection.
북미 IIHS의 천정강도 개선을 위한 차체구조 특성 연구
정민규(Minkyu Jung),김인규(Inkyoo Kim),김정룡(Jungryoung Kim),배현우(Hyunwoo Bai),이만수(Mansu Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Recently, the interest in vehicle safety is increasing, so engineers continuously work on reducing occupant injuries from the frontal, side, rear crash as well as roll over crash. In related to roll over crush, National Highway Traffic Safety Administration (NHTSA) issued Notice of Proposed Rulemaking (NPRM) enhancing the safety standard on roof crush resistance, FMVSS No. 216 is amending some part of the test procedure. Also, in order to nominate a vehicle for the Top Safety Pick award in Insurance Institute for Highway Safety (IIHS), the vehicle must have good ratings in all four Institute tests. In case of roof crush resistance test, strength to weight ratio (SWR) of 4.0 times must measured within 5 inches of plate displacement to obtain good rating. CAE simulation has become a useful tool to optimize the roof structure. This paper shows the correlated CAE results with a physical test. And the improvement of Roof Crush resistance is conducted by using correlated CAE model.
New EURO NCAP에 따른 후석 여성 승객 상해 감소를 위한 안전벨트 사양고찰
문준희(Junhee Moon),조진호(Jinho Cho),이양두(Yangdoo Lee),이만수(Mansu Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Technology of safety equipment of passengers has been evolved constantly in by evolving Automotive industry. And as a result driver injury was also reduced. But safety in frontal crash, is concentrated on the driver seat and passenger seat and NCAP and regulations in all countries of the world still does not take into account rear seat passenger. Nevertheless, safety of the rear seat is also an important and test mode evaluated by 5%ile dummy in rear seat from 2015 has been added to the EURO NCAP frontal crash. So enhanced safety of the rear seat is required more. In order to reduce the injury of passengers in the rear seat, load limiter and pre-tensioner are generally used. But this devices, which can in accordance with the specifications, injury of the head is occurred by collision between head of rear seat passengers and front seat or injuries of chest and neck are occurred by compression of seat belt. Therefore, in this study, in order to reduce the injury of rear seat passenger in the frontal crash, sled test is selected and different specifications of seat belts are tested. Load limiter is divided into three DLL, CLL, and PLL according to method of load limit and applied different limit force to each methods. Pro-tensioner is divided into two, Retractor pre-tensioner, Lap pre-tensioner. After test, using EURO NCAP assessment protocol, convert from injury value to score then select seat belt specification.