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손창규(Changkyu Son),이기선(Kisun Lee),장성재(Sungjae Jang) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Most of countries have their own regulations and New Car Assessment Programs (NCAP) for the evaluation of vehicle crash performance. Until recently, they are considered a driver and a passenger on the 1st row by a majority of the adult occupant performance. But occupants in the rear seat have not been considered in most consumer metric tests. So the 2nd row seat belt as a restraint system was not developed to have a good protection performance of a rear seat occupant even though it considered restricting child seat movement as well as passenger. From the start of China, a rear occupant evaluation has been introduced in Europe as a part of the EuroNCAP with the bigger portion of the total assessment. Occupant protection performance in the rear seat needs to be evaluated in order to perform well in this newly introduced market requirement. To see the trend of kinematic and injury of Hybrid III 5th percentile female (H305) dummy, a series of sled CAEs were conducted following the new EuroNCAP protocol for a 50 km/h full width rigid barrier test. In this paper, the pretensioner effect and single load-limiter effect are analyzed.
MADYMO를 이용한 US NCAP 정면 충돌에서의 목 상해에 관한 연구
손창규(Changkyu Son),한재녕(Jaenyung Han),김홍선(Hongsun Kim),김동석(Dongseok Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The revision of New Car Assessment Program(NCAP) was published by National Highway Traffic Safety Administration(NHTSA) in July 2008. The one of change in frontal impact is the passenger dummy to Hybrid III 5%ile female dummy from Hybrid III 50%ile male dummy. NHTSA has decided to adopt AIS 3+ and AIS 2+ injury risk curves to assess the risk of injury to front seat occupants. Based on the criteria NHTSA test results showed that 5star performances are dropped to 3 or 4 star. In this study, we tried to find out the sensitive body region which will cause the high number of injury probability. Neck injury is the most sensitive value to drive the vehicle safety performance in the passenger. Passenger airbag size effect was investigated to improve the neck injury.
측면 충돌 시 MADYMO Scaling 방법을 이용한 탑승객 상해 Correlation
노진성(Jinsung Rho),손창규(Changkyu Son),김동석(Dongseok Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
CAE analysis for the safety performance of a vehicle has two parts. One part will be conducted by FE analysis such as a LSDYNA software, to develop the ability of a vehicle structure and another part will be pursued by occupant behavior analysis such as a MADYMO software which supports robust airbag models and dummy models to develop the performance to protect its occupants. Due to this separated procedures for the vehicle crash simulation, each procedure makes the most of its merit. In the case of the structural crash simulation, it will focus on the total deformation of vehicle structures and the deformation mode. However, occupant behavior analysis needs the more precise deforming velocity of vehicle structures to conduct its analysis successfully. In this case, to have a more correlated MADYMO model, PSM (Prescribed Structural Motion) data which has the position of all nodes at every time step should be pertinently adjusted. This method will help to have a better correlated MADYMO CAE model in improving the safety performance to protect occupants.
LINCAP MDB에서 MADYMO Scaling 방법을 이용한 탑승객 상해 Correlation
노진성(Jinsung Rho),손창규(Changkyu Son),김동석(Dongseok Kim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The lateral crash analysis can be divided into two steps. The first step is a structure deformation phase by MDB (Moving Deformable Barrier) or the pole. The second step is a dummy interaction phase when a dummy contacts against a door trim and a side air bag. Occupant behavior and injury is affected more by the deformation and the impact velocity. The deformation and velocity data of the vehicle structure can be obtained from crash simulation. They can be transferred to as MADYMO input data. MADYMO can adjust the data to make dummy injury more correlated. In this case, to have a more correlated MADYMO model, PSM (Prescribed Structural Motion) data, which has the positions of all nodes at every time step, should be pertinently adjusted. Two methods are proposed in adjusting the structure behavior. One is to scale time of the structure intrusion, another is to scale displacement of the structure intrusion at every time step. These methods will help to reduce difference between physical test results and occupant CAE analysis results of dummy injury. This study shows better correlated injuries under US LINCAP Barrier conditions.
EuroNCAP 정면충돌 승객거동해석 성능개선에 관한 연구
김홍선(Hongsun Kim),손창규(Changkyu Son),김동석(Dongseok Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In Europe frontal NCAP tests of an Offset Deformable Barrier (ODB), frontal occupant kinematics are influenced by dynamic vehicle motion such as pitching and yawing. Therefore sled condition simulation, which is considered only axial motion, did not meet occupant simulation requirements to keep the relationship between vehicle motion and occupant behavior. However, this kind of motions can't be considered in a sled test. In order to verify the effect of the vehicle motions, the simulation model to include pitching and yawing motion, is proposed. The simulation results are compared with the full vehicle test results and sled test results. It showed that occupant injury values can be better correlated with the vehicle motion and sled test with axial motion could over predict dummy chest and head injury. From this research, realistic vehicle motion is applied in EuroNCAP frontal occupant simulation to improve occupant behavior and dummy reference assessment injury value. Reliable simulation is conducted using a Full FE model, excluding experimental factors. Also, an analysis of belt design parameter effect on chest deflection and dummy excursion will be presented.
정면충돌 시 시트벨트 특성이 후석 승객 거동에 미치는 영향
이기선(Kisun Lee),손창규(Changkyu Son),김용석(Yongsuk Kim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Most of countries have their own regulations and New Car Assessment Programs (NCAP) for the evaluation of vehicle crash performance. Regulations and vehicle design optimization have traditionally focused on the front seat occupant. Until recently, the rear seat occupant has not been considered in most consumer metric tests. As a result, the evaluation of the rear seat occupant has been introduced in Europe as a part of the EuroNCAP. Consequently, the occupant protection performance in the rear seat needs to be evaluated in order to perform well in this newly introduced market requirement. This study investigates the potential benefits of seat belt load limiters in the rear seat on the injury and kinematic of Hybrid III 5th percentile female dummy. A parametric study of rear seat belt was conducted for some different types of belt load limiter. The base of CAE model was validated using 50 km/h full frontal sled test with an emergency locking retractor (ELR) only seat belt which does not have pretensioner and load limiter function.
조수석 에어백의 제어체적법 및 입자법을 이용한 전개 시뮬레이션
이강현(Kanghyun Lee),김권희(Kwonhee Kim),손창규(Changkyu Son),한재녕(Jaenyung Han),김홍선(Hongsun Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The final goal of this study is to predict the effects of airbag on occupant safety when the passenger is in OOP (Out-Of-Position) condition. To this end, accurate and efficient prediction of airbag deployment is essential. Control volume method and particle method were compared for airbag deployment simulation. The drop tower test was simulated with both methods by commercial code LS-DYNA and the results were compared with the test data. At the initial stages of inflation the particle method showed better agreement with the test data while the control volume method showed better agreement with the test data at the later stages. A rational choice would be to start with the particle method initially and then switch to the control volume method later for the rest of the process.
조수석 에어백 설계인자에 따른 여성 승객의 상해치 분석
권율(Yul Kwon),김권희(Kwonhee Kim),손창규(Changkyu Son),김형일(Hyungil Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Motivated by the FMVSS 208 and by the practical importance of USNCAP(Unite States New Car Assessment Program), protection of small female occupants in passenger seat is becoming more important. In this work, passenger airbag deployment process has been modeled and analysed by MADYMO software. Four design parameters of passenger airbags have been selected to investigate the directions of design improvement: time to fire, vent hole size, geometry of tethers and inflator pressure. Sensitivity analyses based on orthogonal array show that enhanced protection of small females can be achieved with improved USNCAP rating within the boundary of FMVSS 208.